Sears 919.174350 2hp12gal compressor bogs down

by Chris
(Tampa, FL)

Works fine when its below 20psi. Pumps up to 100 with no problem.


When its above 20psi. it tries to turn but cant do it. The check valve seems ok, theres no pressure in the tubes when it isnt running and ive had the motor checked out. Any idea?

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Bill says...

Hi Chris. I've got to admit, you've got me confused. You say "Works fine when its below 20psi. Pumps up to 100 with no problem."

How is it it can't pump over 20 PSI without "stopping turning" and at the same time, "pump up to 100 with no problem"?

More details, please. In particular, what doesn't turn and when?

Cheers,

Bill

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Jul 18, 2012
Same Problem
by: Anonymous

I have the same Sears model compressor as the one mentioned and I had the same problem. The compressor pumped up fine to 100 psi, but when it needed to restart, it stalled and eventually blew the breaker. I plugged it into a different outlet on a different circuit and it was fine. Apparently the first circuit couldn't supply the power needed to restart. A too small extension cord could do the same thing.

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sears 5.4, 80 gal,240 volt...bogs

by Shane oconnor
(wa state)

with te air built up past 90p.s.i. starts to bog down,slowing and shaken..??

______________________
Bill says...

Shane, that's not a ton of info to try and diagnose the problem with your air compressor.

My thoughts are though that the compressor motor is bogging down because it's...

a) wearing out and cannot operate the pump against the increasing pressure in the tank

b) your run capacitor may be failing

c) your compressor motor isn't getting enough power due to other appliances pulling power from the compressor circuit and starving the compressor motor

d) possibly a check valve issue not functioning and adding too much back pressure

... you see, that's just a few.

It were my compressor, I'd have the motor and capacitor load checked.

Cheers,

Bill

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Jun 09, 2011
more info
by: Shane-O

Air compressor is brand new.50amp braker,check't plug 115 on both sides. Cord is aprox 2ft long starts boging at around 130psi on its way to 165psi.and restarts in struggle.

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Sears 4hp 20 gallon compressor - compreesor builds to 40 psi then motor starts to really struggle and shut off

by brad
(tucson,az)

I have a Sears 4hp 20 gallon compressor that is exhibiting this condition in which it will start to run fine but as the pressure increases in the tank the electric motor starts to strain and eventually shut down due to overheating of motor-

I disconnected feed tube from air compressor to tank and the motor runs just fine???

Any help or suggestions would be great.

Note that this compressor is 220 volt but I made a conversion cord to work in a 110 outlet--I know this is very unwise but this is a temporary fix-Could this affect the compressor???

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Bill says...

Hi Brad. Dis this problem just start happening, or has it been happening all along since the motor voltage conversion?

If the latter, then you've done something in the conversion that the compressor doesn't like, and it's not able to overcome the back pressure of the 40 PSI in the tank.

Could be that the motor is under powered (not getting enough current) as a result of your conversion.

Regarding "I disconnected feed tube from air compressor to tank and the motor runs just fine???" sure, that makes sense, cause you have removed all the load created by the back pressure from the tank.

Bill

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Aug 29, 2011
pressure build up problem
by: dave

my craftsman 4hp 25gal did this and i removed the back check valve out of the top of the tank where the fill lines connect and cleaned than reinstalled which solved the problem

Mar 13, 2011
120-240 4 ph
by: Anonymous

Did you rewire the motor for 120v? I have sears 4hp and it only will run on 240v its not convertible.
If so that is the problem.
Thanks DW

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takes a long time to build up presure

by R. Wintrow
(Ridge Spring,S.C.)

Sears Md. 919 152812 6hp 60 gal.
Everything seems to be working fine. It just takes a long time to build up to pressure before it cuts off.
If I need to take it apart, I need to know what size the Allen head screw is.
Thanks,

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Bill says...

Well R. Wintrow, if you wander over to the TROUBLESHOOTING page and see the link to "will not build pressure" there are a whole bunch of reasons why this could happen.

You can do a few checks based on what you read there, and if no luck, then post back here as a comment telling me what you found, K?

As to the Key size, you'll have to do what I do, have a set of Imperial and Metric keys and try them until you find the right one, unless you look in your manual for the nut or bolt size.

Cheers and good luck,

Bill

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