Motor seems to be bogging down.

by Will
(Westminster ca.)

I have a 5 hp. coleman powermate compressor that when I turn on the switch the compressor seems to be running fine until the motor struggles at about 15 - 20 lbs. the motor bogs down to a stop. I'm using 120 volts! What do you thinks happening?

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Could be a number of things Will. I tend to think it's a power supply type issue.

Is there anything else running on the same circuit as your compressor is plugged into? That could cause this.

A plugged intake filter could cause this.

Using an extension cord could cause the compressor to bog down. Dump the cord if so, and try again.

If all these are OK, then I'd be inclined to check out the start/run capacitor to see if it's pooched. See how to do that on this site too.

Cheers,

Bill

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Feb 26, 2013
It was the power supply
by: Will

Bill your were dead on as it was the power source. I first pulled the intake filter and checked it and it was clean. So plugging it in to 220 volt the compressor ran perfect. Thank you for your knowledge. Will

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6 gal powermate compressor starts to shake and slow down

by boris skrinjar
(ontario canada)

the 6 gal powermate cmpressor will start up but when getting above 100 psi it starts to shake and slow down to the point that it stops and not reaching max air compression

i have a 60 gal powermate air compressor that when it starts up it is slow in revolutions . then it speeds up then slows down to wher it wants to stop and not reach full pressure. what could be the problem

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Black Max - water gets into the oil?

by Greg
(Fl)

I have a Black Max air compressor for my garage.I put a new pump on it and have changed the oil twice because I keep getting water in the crank cast oil after about three weeks.Could you tell me why the water gets into the oil.
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Greg, if you take a look at the pages on this site about compressor generated water, then you will soon realize that the compressing of the air is a water generator.

So, if compressed air is bypassing your relatively new piston seals, then water vapor is bypassing the seals too, and that water vapor may be condensing in the oil sump. I expect, in time, the seals will wear in better, and the migration of air and water vapor to the sump may lessen, that is, until the seals are wearing out, and the problem will return.

You may also have an issue with environmental water. By that I mean, as your air compressor runs, the whole thing warms up quite a bit, including the oil sump area. If, after you stop using the air compressor, if it in a cool location, or in fact gets cold overnight, air that is in the sump will cool too, and water will condense out of the air onto the metal parts of the sump, and then drain to the oil.

I don't know how much water you have in the oil. You may have to increase the oil change frequency to the level you need to keep the oil / water level under control.

Cheers,

Bill


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Coleman Powermate 5HP blowing breaker?

by Dave Person
(Central Lake, MI. USA)

Coleman Powermate 5HP. 44gal.

Compressor will run for about a minute then blows the circuit breaker. It is on its own dedicated 20 amp circuit and I tried it on another on with the same results. Hope you can help me diagnose this, Thanks, Dave
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Dave, pull the intake filter off,and be sure that it is clean.

If so, then with the compressor empty, open the line from the pump to the tank, so the compressor can run without load. Start it and see if it pops the breaker or not.

Post a comment here with your results, please.

Cheers,

Bill

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Jan 30, 2013
Blowing breaker
by: Anonymous

Hi there, I have a 220v 5hp motor turns on runs for about 30 sec and pops the breaker I have unhooked the pump so there is no load and still does the same thing. I removed the run cap and tested it on ohms and it read 0.06 then about 5 min later it read 0.07. After trying a few times the side of the motor gets warm. So do you think its the cap or the thermal switch in the motor? Do you think the motor needs to be replaced or rebuilt or just change out the run cap?and the cap is not leaking and looks to be in good shape.Thanks for your time.
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If it isn't the capacitor, then I would guess you've got a motor problem.

The thermal switch reacts to overheating of the motor, and should cut the motor off to prevent overheating, but that shouldn't pop the breaker.

B.

Sep 27, 2012
Coleman Powermate Capacitor problem?
by: Anonymous

Hi Bill, In checking one of the capacitors, it had no voltage, so I set my meter to ohms and alternated on the terminals. It never changed, always reading zero or below. Are there 2 capacitors on my motor and what about the fluid leaking out of one?
The leaking one says
Mallory 157696-33 270-324MFD 125VAC 235-9714-03
The other one says Magnetek 25uF 370VAC 175863-25
005-1292-RMF 60P61-5
Protected-No PCBs P10000AFC
Do I need to replace both of these and where can I get parts?

Thanks again, Dave
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Dave, sometimes I'm not at my computer when a post comes in.

From the sound of it, both caps are pooched.

Sources for capacitors are the company that fixes the compressors for the store where you bought yours, find compressor repair shops in your area (see the Repairs page for some shops) and then, if you still need help, contact local electrical motor repair shops.

B.

Sep 26, 2012
Coleman Powermate Capacitor problem?
by: Anonymous

Hi Bill, Are there 2 capacitors on my unit? What about the fluid and can I get parts from you?
Thanks, Dave
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Dave, you mentioned that the smaller cap was hot, so yes, I believe your compressor motor has two.

I don't sell parts myself, but the folks that advertise on my site sure do.

B.

Sep 25, 2012
Coleman Powermate Capacitor problem?
by: Anonymous

Hi Bill, Correction hooked up the line to the tank, then started it. It nearly filled up, then kicked the breaker again. The smaller "capacitor" was hot and there was some fluid leaking out.
It says Mallory 157696-33 270-324MFD 125VAC
235-9714-03
Thanks, Dave
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Time to test the caps, Dave. Might be time to replace them.

B.

Sep 25, 2012
Coleman Powermate Capacitor check
by: Anonymous

Hi Bill, I assume there are two capacitors on my compressor. I don't know but they are different sizes. At any rate I took them both off. The connections looked good so I put them back on and tried it.
I still had the line to the tank off so there was no load, but it worked fine. Do the mounting screws on the capacitors also ground them to the motor? If so I think we found my problem. I will hook the line back up and try it.
Thanks, Dave

Sep 24, 2012
Coleman Powermate popping breakers
by: Anonymous

Hi Bill, The filter is clean. I took off the line to the tank so it could run free. It ran for about the same as before and popped the breaker again. Thanks, Dave
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Dave, that strongly suggests to me that it is a motor problem. No way should the breaker pop if a compressor is running without load, unless it is motor / electrical acting up.

Are you good to check the capacitors? See that page on this site for help in how to do so.

Bill


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