Compressor Will Not Build
       Pressure

air compressor does not refill  compressor turns on fills up to proper pressure shuts off but will not refill with air unless i shut off the power and restart.

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Colman 60 gal. powermate compressor won't build any pressure.  Ok so bought this thing used has a aftermarket, princeS Autoknowbetter, pump and a 3.5 hp motor 220/240v

Just wired shed now go to use and makes lots ...

one 26 gal Farm Hand air compressor electric mortor and pump  hello sir/madam
I have a 26 gal Farm Hand compressor electric motor and pump ,which should build up to 120 psi and start back at 90psi instead it is ...

Compressor doesn't reach shutoff pressure.   It just started doing this: it starts pumping at normal speed and pressure builds but it slows to the point where it is making a revolution once every ...

Won't build up air  I bought a compressor at the Grizzly scratch and dent sale. It was all apart, but all the pieces were there. I order new gaskets and replaced any part ...

Atlas Copco GA11 Will not load  The unloader valve and solenoid seem to be fine but the compressor still will not build pressure

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Bill says....

Danny, this ...

Coleman Powermate Black Max slow to build pressure  I have two Coleman Powermate Black Max direct drive single stage oilless 5hp compressors (27 gal tank) model# BL0502710.

They both were slow to build ...

1971 Kargard nat.bd.no. 563739, 2HP twin cylinder.  I have a 1971 Kargard twin cylinder air compressor. Here is the info on the comressor. Kargard nat.bd.no. 563739. The compressor is leaking oil in several ...

will build and stop at 40 psi  do i need to change the regulator change the valves the gauges.

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Bill says...

Hi there, G!

When your air compressor stops,...

compreesor dont pump up proper  works great other than it will only pump up to 25 psi still runs dont shut off but wont pump to max pressure

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Bill says....

Hello ...

My Cotech compressor does not build pressure.  It sounds like its running fine, but the pressure does not build. And I can feel air flowing from some where (might be a cooling fan (not really sure if ...

Air blowing out valve at the top of compressor... Will not build pressure beyond 40 psi  Hello,

I have a Central Pneumatic (model # 67510) 8 galloon compressor that I bought from Harbor Freight. My compressor will build pressure until it ...

My compressor does not discharge  My compressor starts, but never stops.

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Bill says...

Jorge, could be a number of things.

In order to be specific, you ...

electric motor is slow then stops entirely  oil is good, breaker is ok, it worked fine yesterday, tanks were drained after each use, gets only light workouts and is about 8 years old.

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Ridgid OL50135W won't build pressure  Hello
My Ridgid OL50135W will not build pressure. I just changed the pressure switch and it seems to not help at all. I feel the air and it seems ...

Gas air compressor runs but will not build any air pressor  Gas air compressor runs but will not builb up any air pressor

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Bill says...

Buddy, when these guys run, they run loud. So ...

broken ridgid compresser  my ridgid compresser pops the motor overload button and wont build preassure it has little amount of hours on it why is this happenning?

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compressor will not build pressure  blows air out the fider on top of compressor and with not build pressure above 50 psi

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Bill says...

Howdy Herbert.

Sorry ...

Viair 275c leak  Hi, I have a Viair compressor 275c and it seems that its blowing air out on the inlet, it was running fine on 150psi and i stopped using it for 3 days,...

A Pro Source air compressor model 1110C willl not build pressure  When turn on the pressure will not build up. It has oil. There is no water in the tank.

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Bill says...

So, your air compressor ...

Won't build pressure over 60 psi ~ parts look OK  I have a husky 25gal. compressor Pump # WL390002AJ

I have taken the head apart and all of the gaskets. There seams to be only two gaskets and both ...

Brand new Husky Air Compressor reads 15 psi low on gauge  I have a 26 gallon compressor with a max 150 psi. The manual says it cuts on at 120 and off at 150. However, the actual gauge reading is showing about ...

Air compressor wont pump above 60 psi ~ a solution  I have a Central Pneumatic 94667 air compressor from Harbor Freight.

After about a years use, it ceased to bring the pressure above 60 psi.

After ...

Compressor tank does not fill  compressor works but does not fill tank

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Bill says...

Hi Joe. It's a bit hard to give you any specific ideas, since there ...

WILL NOT BUILD ANY AIR PRESSURE  DEVEBLISS MODEL #FB412-1 WILL NOT BUILD ANY SIGNIFICANT AIR PRESSURE NOTHING IS SHOWING ON EITHER GUAGE. ALTHOUGH IF YOU PULL THE RELIEF VALVE SOME AIR ...

Compressor won’t give its rated CFM output anymore  Hi!

I've looked for an existing thread with the same problem as I but the guy's compressor was costum built so it might not help me.

My ...

Viair 350C suddenly ... no pressure to tank  Hi Guys,

Any thoughts on this one?

I had it working great on a 2 gallon tank. I just replaced the 2 gallon tank for a 5 gallon tank, plumbed it ...

Cpmpressor won't build pressure  I have a Sears/Craftsman 1.5 HP, single cylander, oil free compressor. Mod # 919.155611. The motor starts and the compressor turns and exhausts air throught ...

Craftsman 3 gal 1hp Compressor Will Not Build Pressure  Craftsman 3 gal 1hp Compressor was working fine one minute and the next would not shut down or build more than 40 pds.

Only leak is from crankcase ...

My compressor will work up to 60psi and then continues without stopping  I've got a Porter Cable 3 gallon 2.5HP compressor. Check valve sounds okay and bleeder valve sounds okay. Want to know if it's the leaf valves that cracked....

Makita Mac700 building pressure slowly  I recently purchased a Makita Mac700 to do some trim work around the house. What is the "normal" amount of time for this machine to build up to it's cutout ...

Compressor Will Not Build Pressure  I think the reed valve is not sealing, but it looks okay. Everything in the head looks clean and in good shape. The piston has good suction. What can ...

Update on Reed Valve Replacement (It worked!)  Bill,

My Central Pneumatic 96447 compressor is operational again! Harbor Freight sent me parts 3B, 4B and 5B for approximately $5 plus another $7 ...

Wolf Air Apache 50 blows air out of intake valve  I have just started it up after no use for a while and whilst the motor runs well, the tank is not filling. The air filter is missing and the air seems ...

Reed Valve Replacement--the next step  Bill,

Thanks for your great website. I have really been scratching my head about my compressor. A few minutes at the site has been a great help in ...

Sears Compressor - Model # 919.167311 30 gal  This compressor was given to me. It runs, builds up to 40 psi and won't cut off. It just keeps on running, and running, and running. What's the problem?...

Central Pneumatic #47065 stops at 40 PSI?   I have a Central Pneumatic Vertical air compressor (Model # 47065-125PSI, 21 Gallon, 4.5 Peak HP). The compressor worked fine when it was purchased 3 ...

My compressor just goes to 25 psi  My compressor wont go past 25 psi when it gets to this point it acts like under a huge load and slows right now i made sure its turning in the right disrection ...

My compressor just goes to 25 psi  i plug my compressor in and it runs great and gets to about 25 psi and then slows right down and to were its like its under loads of pressure but just ...

Craftsman won't build pressure  I have a A craftsman 5 gallon 1 horse direct drive oil lubricated cast cylinder air compressor.

I tried using two coil roofing nail guns on this compressor ...

Tank won't fill ,motor runs great  I have a Hitachi 2 HP 4 Gallon Oil-Lubricated Air Compressor Model # EC12

The motor sound strong, but I'm getting hardly any air in my tanks.
Check ...

Compressor won't build up pressure above 20 lb.  I have a Sears 1.5 hp 3 gallon air compressor (Model number 921.153101) that won't build up pressure past 20 lbs. I removed the check valve at the tank ...

Compressor won't pressurize—tank "check valve" issue?  My compressor is a Montgomery Wards brand 220v/1.5 hp 20 gallon model, with a Franklin Electric motor, a two-cylinder compressor, and a Kargard Industries ...

My air compressor works fine until it reaches 50 to 60lbs,then struggles, takes for ever to reach max presser.It was always very quick before.  Don't know were to start or what parts would need replaced. any suggestions would be appreciated. Thank You

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Bill says...

Clearly,...

5hp 20gallon air compressor will run and run...  5hp 20gallon air compressor will run and run but only builds up to 40psi, took line off from pump and ran, blowing lots of air when i unplug dont hear ...

No pressure - compressor turns on just fine  The compressor turns on just fine but it will not build any pressure. The air intake does not feel like it's sucking any air in. I have removed the air ...

do it yourself valves for harbor freight vertical compressor   For those harbor freight compressor people, i would like to offer a possible fix if the problem is from the reeds.

After head disassembly of 4 bolts ...

No pressure over 40 pounds  Friend was going to toss a nice task force pancake compressor because the motor was humming upon start. I took it home and pulled the oil cover off and ...

wont build past 50 psi and blows air out the intake  This just started and I replaced the pressure switch and check valve already.

the compressor runs fine until 50 psi and will run constant but blow ...

xtreme challenge mac7391 air comp air pressure wont go up above 50  xtreme challenge mac7391 air comp. wont reach above 50 so cannot use my nail gun ect. please help. margaret macmillan.

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Bill ...

Pump seems to be working fine but it stalls the motor.  Two-cylinder, two HP, 20 gallon tank, Grainger compressor. It's been working great, all of a sudden it started to bog down the motor above about 40 psi....

Charge Air IRFC5020 5 HP 20 Gallon Portable Compressor Will not Build Pressure  The model is a Charge Air IRFC5020 5 HP 20 Gallon Portable.

I picked up the compressor used - it would not build pressure and leaked a fair bit. I'...

Compressor wont build pressure--ultra basic - belt too loose  Hey thanks this is a great site and gave me the confidence to explore my compressor problem.

Anyway, thought Id let you know that I diagnosed my problem....

hpc compressor will not load  hpc compressor will not load

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Bill says...

Harry, not a lot to go on here, no model, no HP...

Yet, yours is a 100% duty cycle ...

Hitachi - no air  Hitachi EC2510e wheel barrow, motor runs great, but no air.

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Bill says...

Hi Bill. OK, the motor runs great, but is the pump ...

Oholiab 23-OHH two stage compressor - Slow air build up  Bill,
I have an Oholiab 23-OHH two stage compressor (Identical to the Ingersoll Rand T-30) with a five HP electric motor. I purchased it rebuilt 15-20 ...

LP Breathing-Air Supply Compressor used to push 60 psi. After changing airline filter..  LP Breathing-Air Supply Compressor

LP Breathing-Air Supply Compressor used to push 60 psi. After changing airline filter, the resivoir cant recive more ...

hitachi gas powered compressor wont build passed 60. used to build up an then cycle down. replaced black tube to valve. no different  Changed the black tube and fittings. Made no difference.

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Bill says...

Howdy JB. Regardless of whether an air compressor ...

Scew comprssor in building Air  Suction valve seal kits replaced. unloading /loading function in working fine but air building in not happening.

what could be the reason and possible ...

new 60 gal husky air comp. builds 10 psi and stops  new 60 gal husky air comp. turns on, build 10psi and stops

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Bill says...

Hi there, Jorge.

Please unplug it, drain the ...

everything runs but will not build air  sounds like something got a little louder then it quit building any air at all. valve is closed on bottom,dont feel air coming from top or anywhere else....

air compressor won't reach psi   won't shut off
won't reach psi
cannot adjust psi

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Bill says...

go to site map page
look under troubleshooting
read pages ...

Pressure not building on a 3 gallon Craftsman  The compressor runs but builds no pressure.

took the breather off the head and put my finger over the hole while running, still no build up of pressure....

nardi extreme 4 90 litre compressor - compressor is slow to build up pressure  Hi guys I have been given a nardi extreme 4 90 litre compressor. It has one main motor but two v twin pumps on either end of the motor shaft and two fans....

115 psi air compressor /21gal.3hp  125 psi air compressor stops building presser @ 60 psi but keeps running?

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Bill says...

Jeff, could be a number of things ...

brute 15 gl. air comp. - Crank spins freely on motor drive shaftshaft  Picked up a used brute 15 gl. air comp. Worked grate the five times i used it once for a nailer and 4xs for tires. Fifth time the motor kicked on but no ...

central pneumatic compresser builds up to 40 lbs and no more and runs on until i stop it   central pneumatic 2.5 hp/21gal. i let it run for a long time but it does,nt go above 40 lbs.when i shut it off i cant hear any leaks.

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motor whines no air being generated  I was using the compressor when the motor started a very high pitched whine with no air being generated. It sounds like the( air compressor? ) itself has ...

my small durabuilt compressor will not pump air into tank.  the air is coming out of the inlet port, instead of pumping it into the tank.like it rversed itself.

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Bill says...

Rudy, I doubt ...

Puma 5hp singal stage 60 gal compressor - No suction on 1 of the cylinder head  Puma 5hp singal stage 60 gal compressor takes a long time too fill.also notice no suction from one of the intake port along with that cylinder head running ...

Compressor not working over 45 psi - starts to slow down  Compressor starts fine, runs good upto 45 psi and then it starts to slow down, gets to 50 psi then stops, if I remove the feed pipe to tank the pump runs ...

Sullair 750H starts,runs till it builds pressure and then slowly dies  It's like it builds itself into submission

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Bill says...

Hi Robert. Help me out a bit with a comment here, please?

When ...

won't go over 40+lbs, then it gets too hard to turn over  Your Spambot won't let me Post.

Still having troubles with my "no markings" air compressor. Seems that the compressor itself won't go over 40+lbs,...

champion with 12.5 HP kohler engine GASOLINE  I TURN IT ON, IT BUILTS AIR ALL THE WAY, AND IT WOULD IDLE, BUT WHEN PRESSURE GOES DOWN AND IT'S TIME TO KICKING IT WOULD STALL, AND IT WILL NOT TURN BACK ...

husky compressor will not build a high enough preasure  I have a 4 year old husky 3 gallon air compressor and the pressure in the tank will only get up to 50 and it will stay there while it still runs, i checked ...

sanborn air compressor goes to pressure 135 lb and then bleeds air to 80 and starts all over again  air compressor goes to pressure then bleeds air for some type of safety valve to lower pressure and starts over

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Bill says....

Emglo am39 stopped building pressure above 40  I was blowing out my sprinklers just fine (blowing out at about 80 psi) when all of sudden the compressor won't build up above 40 psi. I don't detect ...

no pressure building up except pulling up on safety valve  No tank pressure, no air leaking, compressor runs constantly. has good pressure if you pull up on safety valve but only for 10 seconds. What is the likely ...

UST Mod. 1110C compressor won't build over 40 psi.  The line in my garage from the compressor came apart causing the compressor to run all night and overheat. I made sure the oil was full and restarted the ...

brute compressor will not build air pressure  a 10 gal brute compressor will turn on but will not build any pressure in the air tank. I noticed that it is pumping air out of the air filter. Please ...

car tyre air compressor no pressure  hi there have a car compressor in a built in case has always worked fine until the other day wanted to blow up bike tyre noticed bike tyre went down disconnected ...

switch shut off and slow AIR BUILD UP  i CHANGED OUT MY SHUT OFF SWITCH THINKING IT WOULD WORK FINE. THE AIR BUILDS UP SLOW FROM 90-120 AND WONT SHUT OFF. HAD THE ELECTRIC MOTOR GONE THROUGH....

CLARKE AIR MODEL SE16C150 keeps switching off after about 30 seconds  CLARKE AIR MODEL SE16C150 SERIAL NO. 31965 YEAR 2002 10.2 BAR

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Bill says...

When it is switching off, can you see or hear the ...

Curtis Toledo D96 compressor runs like under heavy load  I have a Curtis Toledo D96 compressor that sat for a couple of years unused. it runs and builds air pressure but it gets slower and slower until i get ...

compressor will not build pressure  hot rod twin tank 3 horse 5 gallon

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Bill says...

The issues that affect an air compressor that won't build pressure are ...

motor spins slow and then stops  the electric motor is a 220v 5 HP century electric. The motor will turn with no belt and trys to spin with belt on but stops and hums

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Compressor builds up pressure to 70 psig ...  Compressor will not build up pressure beyond 70 psi. Then it stop sucking. It won't build up any higher. Don't know what's the problem?

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air leaking back out of the filter  when the tank is full air is coming back out threw the air filter

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Bill says....

Hi there, Drew. If your air compressor has air ...

leaks thru pressure switch  builds pressure up to 25 or so pounds....shut it off and pressure dcreases....leak is defitely from pressure switch

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Bill says...

Nope,...

compressor builds to 60psi then takes a while to reach max pressure  60 gallon crafrman 1996

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Bill says...

Chris, when you read the page about why air compressors don't build pressure, did you use ...

Can only get 30 pounds of pressure in tank.  Motor runs, pressure coming out of pump seems fine. Will run tank up to 30psi. Motor keeps running.... No air leaks when turned off.

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Atalas copco GA15 will not build pressure satisfactorily  Pressure can not be built up beyond 6 bar

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Bill says...

Prashant, 6 bar is about 150 PSI. That's not an unusual cut out pressure ...

air pressure only gets up to 20 psi  air pressure only gets up to 20 psi

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Bill says...

See the TROUBLESHOOTING page. Click the link to "will not build pressure"...

Sanborn air compressor make 20 psi then stops motor trys to keep working but starts to smoke  I have a Sanborn air compressor Model B109B300-22. it reaches 20 psi and will not make more pressure. electric motor continues to try to pump but cannot ...

pump binds up at 15psi   older sears compressor 919.158221--when it hits 15lbs the pump binds up --when I release the pressure the pump wheel is free and easy

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U S Air model MK 783 compressor won't build pressure  I have a very old U S Air model MK 783 compressor in my shop. The intake suction seems OK but the output pressure is very weak.

I thought that a new ...

Osborn compressor making a banging sound and will not hold much pressure.  I have an old 100 psi air compressor. It was made by the Sanborn MFG Co. Model #34A50-10. I payed like 25 bucks for it 4 or 5 years ago. It was well taken ...

compressor surges fast to slow then kicks out the breaker  i disconnected my air compressor its a emerald 5 hp motor from my old house and moved to a new house now i hooked it up and it starts fine but then starts ...

2.5 hp warrior and its only bilding up to 30 psi   Hi l have a 2.5hp warrier aircompresser and its only pumping up to 30 psi ,it allso ls blowing air back throught the air fillter and oil breather hole....

Abbott Compressor Labours and doesnt cut out.  I have an old Abbott compressor. It has been unfortunately a bit neglected. Recently it has started to labour at the last part of its cycle.

It used ...

air compressor will only pump up to 60 psi   the compressor will only pump up to 60 psi it will not shut off because hit has not hit 90 psi.

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Bill says...

Go to the TROUBLESHOOTING ...

Compressor only builds up to 40lbs??  Motor keeps running but wont go above 40 lbs.Was working great last time I used it. What could be the problem????? Thanks, James

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Ingersoll SS-5 Compressor won't build pressure above 120 psi  Slow to build pressure

Won't build pressure above 120 psi and takes a long time to get to that

Thought it was the pressure switch (90-135), jacked ...

ITW Paslode Model D1500HPV5 1.5 hp pancake compressor will not shut off  ITW Paslode Model D1500HPV5 1.5 hp pancake compressor with roll cage. Builds pressure fine but does not stop running. Usually it takes a minute or two ...

Keeping Pressure  When I turn my air compressor on, it fills up to maybe 140-150 psi. I set the outgoing pressure at 85 psi.

I do not hear any leaks or have any problems....

Interesting dilemma - IR Air Compressor recall  I've been chasing repair parts now that I have diagnosed the issue (thanks to a helping hand from you Bill!) and I discovered that the model of IR compressor ...

my centrifugal air compressor is not building pressure above 6.4bar although it is rated for 9bar.what would be the possible cause?  Dear Sir,
my centrifugal air compressor is not building pressure above 6.4bar although it is rated for 9bar.what would be the possible cause?

please ...

FP 202100 120 V 60 HZ 5A 125 PSI (husky)  Compressor does not reach 125 PSI only reaches 40 PSI what the problem

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Bill says...

Tony, hi. There are a bunch of reasons ...

IR air compressor wont build pressure  i have a ir air compressor, 5.5 hp motor, 60 gal tank, it was working fine, i have recently changed the oil in it and it worked ok after that until it ...

my air compressor wont build pressure  when i start it up it sounds ok just the gages stay at the same spot and wont build pressure

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Bill says...

Hello Scott. There ...

no tank pressure  I am getting around 100 psi on the regulated pressure gauge, but wont go above that, and the tank pressure gauge 0. Any ideas as to why regulated pressure ...

Need corroboration on pressure issue findings  Bill,

Thank you for all the helpful information you have compiled about our friend the air compressor. Thank you for saving me some bucks as well. I ...

Ingersol Rand Compressor keeps running - pressure gauge never hits cutoff setting  I have a 3.3hp Ingersoll Rand 20 gallon compressor with a Pumptrol D pressure switch model FHG135S101,

The most recent time I fired up the compressor ...

my compresser only builds air till 40 psi and keeps on running  my air compreeser (20 gal) 5 hp motor only builds air up to 40 psi and keeps on runing. what can i do ?

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Bill says...

George,...

Air compressor motor will run but will not build pressure, it just makes a clicking noise any ideas?  This is only the second time using it. Im building a shelf in the basement it worked for about 20 min. and then the clicking started. There is oil in it....

Briggs and Straton Pro Series won't go above 40 lbs and motor continues to run.  I have a Briggs and Straton Pro Series 6 gal compressor, model074008. It will start up and reach 40 psi , then continue running , but the pressure won'...

will not come up to correct pressure  will not come up to correct pressure

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Bill says...

So, Jerry, what I hear you saying is that your air compressor runs fine, but ...

Pressure in tank won't rise  I have a HUSKY H1820F compressor. My tank
pressure gauge reads 60psi. It gets no higher. My pressure gauge goes up the
required MAX of 155psi cut out ...

Ridgid  Mobile Air electric mini wheel barrow compressor. It operates but very slowly and will not build pressure. Air is pumping out the release valve on the ...

What's the specs to tight screws back after removing head valve?  what's the specs to tight screws back after removing the head valve? can i use silicone to replace the gaskets? where can i find a reliable & affordable ...

Motor starts and stops/ starts and stops @ 20 pounds of pressure  Motor will start fine then at 20# it will start to bogg down then restart over and over.

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Bill says...

I've been thinking ...

Building pressure  The compressor will build pressure, but it takes forever (about 3 times longer than it used to) to build up to 125 p.s.i.. And also, how often should ...

Compressor will not Build Pressures  I check it to se there was a broken gasket, need oil or air liks and none of those things are the problem. What ca it be.

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Bill ...

u.s. general  Stationary compressor 7hp 175psi. When the compressor is on it only gets up to 100psi and keeps running but does not build any more pressure there are ...

Quincy compressor slow building pressure  I have a Quincy one lung air compressor that when it starts running it free wheels for a long time before it starts building pressure.

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iron force air compressor won't build pressure  oilless will not build perss no leaks

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Bill says...

Not much to go on here, Joe.

I suggest you read the pages linked from the ...

Senco PC1010 diagnose  My 1-gal air compressor only fills the tank up to 35 psi rather than it's usual 125 psi. Both gauges show identical readings and the motor will continueously ...

air compessor only builds air to 55psi  compressor only builds air to 55psi motor keeps running 5 hp single stage verical 26 gal tank oil pump can you help me.

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Bill says....

bostich cap2040 wont build press. over 25psi  bostich cap2040 wont build press. over 25psi

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Bill says...

Greetings.

I sure wish I knew if you had had a chance to ...

Tank builds no pressure.   After some extensive research to the problem of my compressor tank not building pressure, I was told to try ordering a set of replacement reed valves.

I ...

compressor build to about 150PSI and then slows til belt starts slipping  I have a 5 hp ACS brand compressor.

It is for hobby use so it is not used that much.

It is outside but under shelter.It is about 3 yrs old.\

It ...

Compressor builds pressure to 120psi and will not shut off  Air compressor builds pressure to 120psi and then can't build any more pressure to shut off compressor and it just keeps running. The jug is getting very ...

wont build pressure past 50  compressor wont build pressure past 50

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Bill says...

Ernesto, you found the Troubleshooting page, I take it?

Please go to ...

sullair 185 won't build pressure  compressor starts and runs fine it just doesnt make any air my boss purchased it at a auction and we have no owners manual whatsoever could low compressor ...

black max compressor stops building pressure  i have an 80 gal black max compressor: runs fine and builds pressure until it get to 25 lbs. at this point the motor/pump starts to slow down--then about ...

Craftsman 919.165250 compressor ~Replaced valve body, but still won't build pressure  I have a Craftsman 919.165250 compressor. I went through your site and it seems the valve plate was bad. Upon replacing it, same issue and the old one ...

Pressure will not go above 40psi and will not turn off, I guess because it has not reached the correct pressure   Pressure will not go above 40psi and will not turn off, I guess because it has not reached the correct pressure.

Thats about it really!

Seems like ...

tank will not fill past 4 pounds pressure  same as above, plus the motor keeps on running.

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Bill says...

Hello Jim.

On the COMPRESSOR WILL NOT BUILD PRESSURE page,...

compressor will not stop running  air compressor will notstop running???

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Bill says...

Hi Daniel.

That your air compressor won't stop running can be ...

air compressure runs overtime   the compressor suppose to build the pressure of 8bar within 5minute ,but after 6 month usage it takes to build the same in 20 minute ..why it is taking ...

craftsman upright 33gal. 6hp air compressor won't build pressure  my compressor starts and will build pressure until about75 psi and then just keeps running without building anymore pressure. The pressure seems to build ...

my compressor wont build enough pressure and cut out.  hi there, i have a Clarke Air Compressor - SE25C 200.
it was bought new around 18 months ago. it was working fine until i drained it a week ago. now it ...

how do you adjust the regulator valve?  Compressor will not build pressure above 100 psi. Its a Titan 5.5 hp, 8 gal. compressor

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Bill says...

You adjust the ...

Cylinder head gets hot in seconds  I have a 1 hp 3 gallon craftsman compressor that only builds 40 lbs and keeps running.The compressor head also gets hot in seconds.I pulled the intake ...

My compressor runs great but won't go over about 20 lbs  my compressor runs great but won't go over about 20 lbs

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Bill says...

With respect, if it won't go over 20 PSI in the tank,...

Builds Air Slow  I got a 5Z404 and its got slow about building air pressure , no leaks . I was wondering if just the reed valves might be bad ? This compressor hasnt been ...

Air pressure (won't stop - no more pressure)  will only give 40 pounds pressure but continues to pump more air will not stop on it's own

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Bill says...

Hello Norm....

Motor is free to turn but it will trip motor overload  I have a Central Pneumatic Vertical air compressor (Model # 47065-125PSI, 21 Gallon, 4.5 Peak HP). The compressor worked fine when it was purchased 3 years ...

Ask What to do when your Compressor Will Not Build Pressure  Ask What to do when your Compressor Will Not Build Pressure

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Bill says...

First, you read the page linked from this one that ...

compressor outlet air flow  my compressor which i use for my airbrush is not blowing out much air ,when i checked it appears the air seems to be coming out of the air intake pipe ...

motor bogs down / possible a bad check valve ?  the electric motor bogs down after building a little air pressure
about 20-25 psi.It wants to cut out on overload, it's a 5 h.p. 2 stage reciprocating ...

Compressor doesn't build pressure - motor stops - then starts with intake plugged?  My cheap chinese air compressor had this problem from new. For various reasons, I've still got the thing.

It's a 2.5 HP NuAir compressor - single cylinder ...

building air pressure  I have a Tool Shop 2HP 4 Gal Pancake compressor and I only can get it to go 55 psi It never shuts off it just does not get above 55psi. How do I get it ...

I have a Husky 13gal air compressor. It builds up to 50PSI and no more. It also will not stop runnimg.   My13 gal air compressor builds up to 50psi and no more also i5t will not turn off and keeps running. When I manually turn off the compressor it will hold ...

Have air compressor that won't shut off!  it goes to 75 psi and never goes past that

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Bill says...

Hi Melinda.

From the "my compressor won't build pressure"...

craftsman 919125250 won't build pressure is it disposable?  Anybody got an ideal about my compressor not compresing. 5.5 25gal tank oiless. Any replacement parts or disposable?

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Bill says...

Hard ...

Will not build no pressure.  air compressor will turn but will not produce presure. Yes,it sucks air in from intake. No pressure at all.

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Bill says....

hitachi ec12 compressor will not start with pressure over 30 psi simply pops breaker  hitachi ec12 compressor will not start with pressure over 30 psi simply pops breaker.

Check valve looks good reset pressure regulator to start at 40 ...

compressor has been sitting for a while and will not build pressure  compressor has been sitting how long does it take before I should start seeing air pressure

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Bill says...

Reg, as ...

My compressor cuts out after a few minutes  please what happens to my compressor, that it goes off when i press the 1-minute relay switch, i have a CompAir C115-12 model

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wont rise above 40psi  runs fine goes to 40psi and keeps runing but wot clime above40 psi 115psi max campell hose field 15gallon tank

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Bill says...

Hey ...

Very little air pressure at outlet but pump is working.  I have an ancient Speedaire compressor model 17-57, pump model A-9(most of the model numbers are rubbed off. I suspect I need the pump rebuilt or perhaps ...

harbor freight pancake compressor/need parts  I have a harbor freight 2hp oil type portable comp..Pressure wont get past 60pds.& stays running.No bodyaround here has valve kits.Are parts avaible in ...

Craftsman 60 gal won't build more than 40 psi  I have 60 gal Craftsman compressor with 6.5 hp motor. It runs fine but the pressure will not build past 40 psi. No leaks anywhere. I did notice that ...

Pressure won't get past 60 PSI  builds pressure to 60 lbs,continues to run without shutting off. bought the unituprite,30 gal.,230 voltat harbor freight

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Bill ...

Air compressor wont get over 110 lb  it was pumping up and popped then changed pitch. Now won't go over 110 and has to be turned off. its an upright 30 gal coleman

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Bill ...

My air compressor builds pressure in the tank but nothing in the output.  My air compressor builds tank pressure, but the meter shows no output pressure. When I pull the relief valve, there is a release of air. What is wrong?...

Compressor runs but doesn't build pressure anymore  compressor just kept running one day and was staying at the same low pressure and seemed like to be overheating.

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Bill says...

Billy,...

My Speedaire compressor stop pumping up air.  I have a Speedaire 4.gal pancake compressor,I've it for ten yrs.And it's a great compressor.It stop pumping up air.What part do I need to repair it.I purchased ...

One weird problem  I got an old sears compressor, had the reed valve dropped and thats all. the screw holding the reed valve was stuck inside the one way check valve, got ...

My compressor cannot seem to get more than 40lbs of pressure and I cannot figure out the problem.   I have a central pneumatic 2 hp pancake style compressor. suddenly it runs constantly and won't exceed 40psi.??? blown gasket?

Sincerely,...

Husky 26 gallon air compressor will build enough pressure  Husky 26 gallon air compressor continues to run because it only goes to 95psi and the pressure switch needs 155psi.. replaced gaskets and assy plates per ...

Pressure won't build ~ Now it does! A success story.  2HP PANCAKE AIR COMPRESSOR BY CENTRAL PNEUMATIC:
i want to thank you and your site for helping me solve my problem. after reading all entries in this ...

builds pressure but only half  I have a bostitch 150psi 6 gal compressor. Its less than a year old. Went to use it last night and it would only build pressure to around 45psi. After ...

Rotary Screw compressor, pressure not rising?  Hi,

First i want to thank you for helping engineers,technicians and otheres.

Actually,We have a screw type Atlas Copco compressor(Alup) ,that usually ...

Takes a long time to get to 120 psi  why does it take so long to built up air

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Bill says...

I don't know what "a long time" is, and I don't know how long ...

Compressor only builds to 40lb  davilbiss f420 single cyl stops building air at 40lb. I have replaced the compression ring and gasket for that, still no pressure past 40lb.

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Husky 3-Gallon small compressors pressure problems  Husky 3-Gallon small compressors not biulding up to 60psi only about 38 psi? Only use for tires, small cleaning projects.

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Bill ...

Pressure won't build  my small pancake compressor for brad gun just runs without building pressure to 80 lbs as set. it will build to 60lbs and continue to run at that level....

Air compressor will not build up air pressure in the hose  The air compressor comes on but there is no pressure in the hose.

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Bill says...

Hi there. When your compressor is running,...

Speed Air 7.5 HP compressor won't shut off when it hits 90 PSI  The air filter which is attached to the right cylinder fell off (apparently the screw attachment melted off).

There is also a trace of smoke emitting ...

wont reach cutoff pressure. no leaks.   Hi. Just a working guy in the boonies of Costa Rica. Second details attempt. Stood up to grab my camera to upload a couple pics and tripped on the charger ...

air compressor runs but is not building any air pressure.  I purchased an inexpensive air compressure and use it to fill car, and bike tires. I have checked the oil and when plugged in and turned on the motor runs ...

Busted Gasket ... quality issue  Take the head off, you have a busted gasket it sounds like. Happened to me. Seams like being these products are so cheap they would make a killing on parts ...

Pressure to 50+ won't reach more motor still runs - no leaks  have a Hot Rod twin tank air compressor 5 gallons 3 peak HP, pressure goes to a little over 50 then nothing more motor still runs normaly but no more persure ...

My compressor will not pressurize over 25psi. Motor balks and shuts off after 2 minutes.  I just got this old Craftsman compressor from my neighbor who was getting rid of it so took it and am trying to fix it. It been outside for a year. I've ...

Speedaire 2Z499B  Hello, I've got a problem with this pump, when it builds up to 25lbs. it acts like it is in a bind and turns very slowly, when you remove power it is free....

Air compressor will not reach max psi  Hello,

My air compressor says it has a 135 Max psi, but it only charges up to 120psi. It is a new Ridgid (OF25135CW) air compressor, 1 hp, 2.5 Gal....

When building pressure, the compressor slows and then stalls with a hum.   I have an Hitachi EC-12 system. I have had this problem before. When I first pressurize it seems to build to 120 on the tank, and stays regulated to ...

Air compresser  When pressure get's near 30 lb, motor starts to drag and then kicks the motor out. it is a 60 gallon, 7hp motor

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Bill ...

Hi i have a 1hp 3 gallon craftsman Compressor that will not build pressure past 25 psi  i have taken the head of and took the cylinder off and piston and the 3 rings look new,plenty of oil too. also this unit is less than a year old and not ...

Compressor builds up to 60 psi then shuts off...  I have an air compressor I purchased from Harbor Freight a couple years ago.

It is a 3 HP, 21 Gallon, 115 PSI Cast Iron Vertical Air Compressor with ...

Pressure won't build up  Mech Power M90002

Compressor runs but will not build pressure over 32 pounds. NO leaks that I can find.

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Bill says...

Hi ...

There is no psi with a running compressor.  It runs but there is no psi and of course no air coming out the hose.

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Bill says...

That's a real pain in the backside,...

Startup Pressure  I just purchased a 80gal Single Phase compressor from lowes. Unit was wired per manufactureres specs, filled with oil and ran for 1 hour to seat in the ...

Wont build up any air presure  its a central pneumatic md# 94667 21 gal tank. motor runs great. please let me know what i need to do. thanks lcd

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Bill says...

Please ...

Motor runs great, but pressure does not build in the tanks  Hi

I was given a Kawasaki 2 tank 5 gallon compressor by a friend who is frustrated with the fact that the motor runs fine but it seems like there is ...

Pump is slow to start  When you turn the pump on, it starts running but after a few seconds begins to slow then stops. What needs fixed? thanks,

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Bill ...

Hitachi EC12  Unit no longer fills the tanks, runs fine but no prerssure builds up and air is blowing out the oil tube

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Bill says...

Hello ...

Only gets to 30 psi  I have a 5ph, 60gal upright compressor. It starts up OK but when the pressure gets to about 30 psi the motor slows and stops. It seems like the motor ...

Small compressor won't hold pressure above 60psi  Compressor builds pressure normally to 60 psi, but will not build further. Motor runs fine, no indication of strain. Checked for leaks with soapy water....

2Z498B only has air intermetently...  2Z498B only has air intermetently, using sprayer on regular spray mode vs the sensor detected off and on mode

Correct Answer may save marriage.

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Air comreessor will not biuld up air  motor runs will not biuld up air

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Bill says...

Not a lot of info to go on here, Rick.

The best thing you ...

Compressor won't build pressure  I have checked everthing per your site and still can't get this craftsman 1hp 3gal 125psi to get over 10 psi

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Bill says...

Hi ...

My air compressor wont build pressure more than 25 psi  I have a portable air compressor oil less maybe a 2 gallon. BLACK CAT is the brand. All of a sudden when I use it it only goes to 25 psi, I took off the ...

compressor slow to build pressure, wont pump over 60 psi  I have a bostitch cap 2040p it takes a long time to build to 60 psi, will not go beyond that. if I shut off manually it seems to hold take pressure just ...

low pressure build-up  My 30gal. sears compressor only builds up to about 30lbs. I've checked for leaks and there are none. I'm getting full electrical input. Whats wrong?

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Won't cut off.  I haves Sears air compressor. It runs continuously and I can't set the pressure switch to cut it off. My tank pressure guage never reads over 95 PSI ...

Another compressor that won't build pressure  I have a gas powered compressor, like so many that won't build pressure. I have looked all through the pages and not sure what it is so hoping you could ...

hl410100 compressor  Only fills to exactly 25 lbs. Pump keeps running and cannot find any air leak

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Bill says...

Hi Troy. That's a pretty annoying ...

AIR COMPRESSOR  MY SEARS AIR COMPRESSOR PUMPS AIR OUT THE AIR INTAKE.
MODEL 919.165200

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Bill says...

Hello Larry. This problem is typical of ...

Tank pressure doesnt reach cut-out level  my name is Rich....i bought a porter cable c2002 air compressor in dec. of 09. the first one i bought the compressor never shut off. i got that one ...

After ten # pressure It then blows air out intake.   Have replaced pressure reg valve and checked check valve operation ok. I have removed head to check reed valves and could find no problem. If pressure ...

Won't build pressure beyond 40 psi.  I have a mix and match unit. It started life as a Devilbis 5hp 80gal. When it was given to me the pump had been parted out. I replaced it with a Harbor ...

Why is my compressor only building pressure up to 35 lbs and no further ?   Craftman 125 psi 1hp 12 gal. I tried adjusting the regulator. I have even tried changing the regulator and had no change.

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Bill ...

Compressor will not stop running or build up pressure  I have a 1 1/2 year old Husky 26gal. model #H1826F.

The motor/pump went out,it would not get above 18psi.

I put a new one on.

Now it will get ...

Cummings 1.5hp air compressor stopped working  I was using it one day and then it wouldn't start the next. Doesn't seem to be getting any power at all. Plugged in, checked all the connections. All ...

Compressor starts but motors stalls before 30lbs  I just bought new compressor had new wiring run and hooked up start compressor and runs fine until about 25lbs then motor lugs then stalls. Thought it ...

The Craftsman compressor will not build pressure  Compressor runs but will not build pressure. It feels as if the air is coming out of the intake port (through the filter.

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Bil says....

Porter cable pancake compressor  the compressor will not fully charge. It is suppose to charge to 90 PSI but only charges to 60 PSI. What can be causing this?
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My compressor hits the target air pressure but doesn't shut off.  Hi, I have a new (used about 10 times to fill tires and take a few wheels off) Craftsman 17 gallon, 1.1 horsepower, 150 max psi compressor that is doing ...

My 2hp 50ltr tank build to 1bar and stops......  Hi, i've got a 2 hp 50ltr compressor which seems to stop around the 1 bar pressure. the motor seems to run fine and goes on and on but no matter how long ...

It is about the unloader valve of mobile air compressor.  The air compressor is not loading above 4 bar.

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Bill says...

G'day.

You say... "It is about the unloader valve of mobile ...

Compressor won't build pressure beyond 50  I have a couple Senco PC1010 small compressors. One will not build more than 50 lbs. I replaced the valve going into the tank and no change. I traded ...

Compressor runs, will not build pressure  I've picked up a free Craftsman 5 horse 12 gallon oilfree compressor that will run, but will not build pressure. After taking the head off, and cleaning ...

My air compressor won't build up sufficient pressure.  My compressor is a 1.5hp 175psi twin-cyl model, 230v single phase motor. It builds up about 45psi, and the motor slows down. The start capacitor switch ...

Cpmpressor builds to 40psi and that is it. runs continuously  hello, i have a craftsman 2hp 5 gallon air compressor for 2 years basically just pumping up tires and running a nail gun at the house. Now the compressor ...

Slow on building pressure and air comes out intake filter?  I have a type 30 Ingersoll Rand and just finished rebuilding the top end as well as new rings I also just finished putting a new 5hp single stage motor ...

My air compressor leaks  My air compressor will build up to 125psi then leak down to 80psi.When it leaks down to 80psi it comes back on.

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Bill ...

No tank air pressure  The motor and compressor runs fine; compressor sucks in plenty of air. I removed a air line between the compressor and tank and turned on the compressor ...

Compressor wont build air  What are some symptoms of the o ring on the piston having a small bad spot in it.

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Bill says...

It's probably not an "O" ring on ...

Crafstman 30 gal oiless compressor  runs but will not build up pressure. It will build up to about 20lbs or so. also sounds like its ratting inside. Pump turns free by hand. Not a very old ...

My compressor won't hold more than 40psi and the motor stops.  It reaches 40 psi then the motor slows down and starts to jerk and not turn. it jumps back and forth trying to turn and sometimes it does I have no clue ...

Compressor smoked, now doesn't run right.  I have a Bostitch CAP60PB oil free and it has worked flawlessly for a year.

The other day I was working on the roof and it was sitting at a slight ...

What to do when your compressor will not build pressure?  My compressor will not shut off and it is supposed to cut off at 150 psi but will only build up to 125 and keeps running.

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Bill ...

oil-less air compressor  oil-less air compressor wont go past 30psi and when it gets up to 30 it smells like burning plastic?

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Bill says....

starts up slow and then shuts off at about 20 psi  My air compressor starts up sluggish and then runs good until about 15 pounds starts to slow down, and by 20 pounds it shuts down.
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Bill ...

motor cannot continue to run pump once 25 psi is reached   new motor but once the pressure in the tank reaches 25psi the motor begins to seize and draw high amps.

It did the same thing with the old motor.

We ...

compressor will not build pressure  i have a type 30 IR compressor .i have replaced the complete valve plate assem. and i have honed the cylinders and reringed them. all looks good but it ...

Compressure builds up about 24 lbs. of pressure and keeps runing.....?  Compressure builds up about 24 lbs. of pressure and keeps runing with no more pressure buildup. Checked all the connections for leaks but seemed to be ...

Speedaire 10 hp compressor  As compressor builds up pressure it starts slowing down. Seems to build pressure fine, just slows down to a crawl sometimes. Seems worse in cold temperature....

Compressor builds air but I'm feeling a little blow by out of the air intake port  20 gal tank and it takes a long time to fill do you think it might be the reed valve?



Bill says...

Hey Roy. Could be the reed valve, could ...

Air compressor won't build pressure?  I have a CH compressor model FP2300. The motor runs but won't build pressure. I removed the motor housing and remove what appears to be a graphite seal ...

Not building enough air pressure   Model #919155731 25 GAllon 3 1/2 horse power it is building only 10-20lbs of air. Could it be the regulator? Or the Diaphram in the regulator?



Bill ...

My air compressor will only build pressure up to 40 psi  my compressor runs fine no leaks any where, but stops building pressure at 40 psi. the motor does not bog down it runs fine, just wont build pressure over ...

Sears 1.5hp 3 gal will not pump up  I have a sears 1.5hp 3 gal. It will not pump past 60 psi. it does not dump the air it just continues to run. When you shut it off it does not leak. I have ...

Builds up to 40 psi and no more  I'm not sure what it is called but it is blowing air out a valve that is not supost to until it reaches 125psi. This is on a gas powered air compressor....

Builds to 60 psi then slows  Napa 5hp 2 stage
head seems to see pressure
I rebuilt head same issue
disconnect feed into tank after filling to 60 holds pressure

this leads me ...

CH 22-gal. compressor won't build to max. pressure and cut off automatically  CH model WL650900 is 6 years old. Rated at max. 150 psi it used to max out at 126 psi and cut off automatically but not now. I don't need more pressure ...

What the heck is the name to the valve/nipple thing on the compressor intake  Well to keep it simple my craftsmen 1.5HP 12Gal Horizontal air compressor modal# 919.155613 is not sustaining more then 20psi while the motor runs and ...

Piston compressor won't build pressure  My compressor resently stopped compressing air to the tank. The motor still runs and everything is turning but air does not want to pump to the tank. I ...

Compressor starts to build pressure than stops  Hi A I have an old Craftsman conpresser and the pump broke A rod.

So I replaced the air pump and it would not build over 80 psi it would start to slow ...

Compressor keeps running  I just got a used Thomas Ultra air -pac t-30hp-591. I turn it on , it builds pressure to about 120- 122. The cut off should be 125,but it never seems ...

Ingersoll Rand T30 Aircompressor  It will run continuously and never get past 80psi.



Bill says...

Have a look at this page on why compressors won't build pressure.

Hope ...

Air compressor won't build pressure  I have an air compressor that turns on and all but it will not compress the air there are no leaks is this the piston?



Bill says...

Hello ...

Just a question  If I run my two-stage devilbiss at it's normal driven speed will it continue to build air in the tank, or is there a formula to determine how much pressure ...

Compressor runs but will not biuld up pressure.  Compressor will not build up pressure, it starts the same, and sounds the same.



Bill says...

Howdy Clinton. That's pretty frustrating, isn'...

air compressor not shutting off  My air compressor doesn't shut off, and only stops at 60 psi but it should max out on 130 psi. it ran for over an hour and only got to 60 psi. then a ...

Compressor won't reach cut out pressure  Hi,

I have a Bostich 150 psi 6 gal pancake compressor model # CAP2000P. The last couple of times I've used it, it pressurizes up to approx. 145 ...

Not building pressure  Builds pressure to 40 lbs and keeps running. If I shut it off and turn it back on it locks up the motor. Craftsman model 165300. Recently had to replace ...

compressor not building the correct air pressure!  Here are tips on troubleshooting why your air compressor refuses to build the correct air pressure.

Compressor/motor stops after building to @ 40lbs.  I inherited an older upright farm air compressor. I had the compressor pump rebuilt but didn't install it for about 1 year because I didn't need it. I ...

Compressor/motor stops after building to @ 40lbs.  I inherited an older upright farm air compressor. I had the compressor pump rebuilt but didn't install it for about 1 year because I didn't need it.

I ...

Husky air compressor does not build up pressure  hello guys i have the husky compressor the horizontal one.
serial i belief is the wl651003aj.
in my case my compressor turn on but does not build up ...

No Pressure  I have a Kobalt 26gallon air compressor model VLK1582609A.

The belt broke and I had to replace the belt and the manifold with the gauges. I put it ...

Bostich Compressor never gets to cut off pressure  I just replace the valve head with a newer style head from the CAP60PB-OF (mine is the CAP60P-OF) due to a broken valve flap. Now it gets to about 128lbs ...

Motor runs compresser but does not build enough pressure   It will not build enough pressure to shut-off and will not build enough pressure to run air tools.



Bill responds...

Howdy, and thanks both ...

Compressor not building pressure and running funny.  I have a Craftsman 60-gallon 2 stage oil less compressor, model919.152811, which has a ac-0051 motor, and it does not want to build pressure.

I checked ...

Compressor runs but will not build pressure over 80   It is a 2.0 hp 6 gal. compressor. I normally drain it by the relief value ocassionlly to help keep moisture out, but i had a helper drain it one day by ...

will not reach top pressure  I have a small pancake 3 gal. air compressor
It reaches about 80 psi and will not go up to the set pressure of 110 psi. It just keeps running.



Bill ...

pressure not building up properly  Minimum/ maximum cut-off pressure is 7.5bar/ 9.0bar respectively. the building up of pressure is 'intermittent' (sometimes it works fine, sometimes not)...

Compressor does not build full pressure  emglo k15a-8p turns on but does not seem like it is running full speed. it builds pressure slowly and only up to around 80psi. I think it is setup as ...

Won't shut off  It is very slow at building pressure and wont shut off.



Bill answers...

Hi Larry, nice to hear from you.

Two issues here, hmmm? One is ...

My compressor will not pressurize past 105 psi  Reaches 105 psi and slows down to a stop will not pass 105. pump is still running so its not the switch. I just replaced the head with a new. Not sure ...

I/R 2475 with a 12.5 HP gas motor  The compressor seems to be very slow in building up, the motor does go into high speed and it does kick into slow speed when it gets to 200psi, but just ...

Compressor will not stop  Typical problems for air compressors that won't build pressure.

Air Compressor turns off before it's pumped up.  I have a Bostitch Cap2040p air compressor.It pumps up the first time. after I use it for a bit it shuts off before it reaches it required pressure. I have ...

Compressor won't get past 120 PSI  So it never stops running.



Bill answers...

Why can't the pressure in your tank get past 120 PSI and reach the cut-out pressure of your compressor?...