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Rebuilt piston compressor works fine but only reach 35 pounds seems like tank won't fill motor slows down belt smokes if I disconnect pipe and valve from tanks it runs fine with out issues also ran and bled down tank a few times but does the same thing

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Check for a faulty check valve at the tank inlet end of the pipe
possible blocked from carbon build up
This would account for a piston lockup ( over pressure) causing the belts to slip but to work ok when the pipe is removed

Posted on Mar 28, 2015

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Posted on Jan 02, 2017

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Why can`t my compressor pump over ten pounds ?


You didn't state what model compressor you have so in gerneral: if you have no leaks, remove the air pump head to check the reed valves on the valve plate and the condition of the piston, piston ring(s) and cylinder. If the reed valves are broken or warped from heat they won't seal properly. If the piston ring(s) are broken or the cylinder is badly scored air will leak past the piston instead of compressing and going into the tank.

Oct 23, 2012 | Air Tools & Compressors

1 Answer

Have a 919.167240 that won't go over 60psi. No leaks, the check valve is working. Motor keeps running and I need to shut it down manually.I removed the compressor and checked the head and housing,


If all is well where you say it is the next thing I'd check is the condition of the piston & cylinder then the valve plate. On oilless compressors it's common for the ring on the piston to get worn or have peices come off. It may or may not damage the cylinder but it will be able to compress air until the pressure is too high for the leak past the piston to overcome. Also if the valve plate got overly hot the reed valves may warp or break off, again letting the pump compress air only to a point then the internal leak will prevent it from getting high enough for the motor to stop and cool down.

Jul 08, 2012 | Craftsman 15 gal Air Compressor 3 hp UMC...

1 Answer

My compressor will pump anymore than 35 pounds. I have put in a new piston kit. What is wrong


Does the motor continue to cycle?
Is the air bleed valve completely closed?
Is the regulator knob adjusted to the highest pressure?
What are the tank readings vs. the regulated pressure readings?

Hope this helps.

Jun 22, 2010 | Porter Cable Cable 135 PSI, 15 Gal. Oil -...

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OIL FILLED COMPRESSOR SEEMS TO FREEZE UP ???


Cold weather will freeze the water the compressor normally makes and this can prevent the motor from driving the compressor. Drain the tank and warm it up as needed......

Jan 10, 2010 | Craftsman Air Tools & Compressors

2 Answers

Compressor tank will not fill with air


piston rings gone valves stuck inside nonreturn valve jammed the pipe coming from the pump unit into the tank before it goes into the tank it goes to a gold valve you need to take this out and check the rubber and spring if the seem ok turn it around and put back in then get back to me buddy

Sep 16, 2009 | Air Tools & Compressors

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I have a craftsman 2 hp air compressor,(model#919.176320) that fills fine,but then will not refill,as if there is presure in the line.The instructions say it will fill to 125lbs,Then refill(cut in...


Hi,lets see what we can do.The air compressor has a relief valve,like check valve .that is not working.The valve reliefs the head pressure so it can be restarted at any time.If pressure is on top of the piston pushing down it can not restart.The pressure in the head on top of the piston is greater than the pressure under the piston.I hope this helps,if you need more assistance feel free to contact me.,,roniecon@gmail.com

Jul 10, 2009 | Air Tools & Compressors

1 Answer

Know tank pressure


"no matter how long the compressor runs" If it's not connected to any high volume consuming devices, and that no leak has been detected...then either an head valve (checkvalve) , severed motor shaft, nor the piston/diaphragm is defective. If it does stop after a few minutes the gauge is surely defective

Jun 04, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Air compressor fills, but slows down as the pressure builds


sounds like you need a new check valve which should be somewhere between the compressor outlet piping,tubing,etc and the tank which prevents the air in tank to back feed to the compressor which would cause hard starting and could damage the motor easy way to check is when you shut off the compressor with some air in the tank if the check valve is bad it would continue to bleed air out out the unloader valve .the unloader valve on your unit is most likely part of the pressure switch when the unit shuts of it should only bleed down the pressure in the pump so it would make it easy to start when needed hope i didn't confuse you

Mar 22, 2009 | Campbell Hausfeld Air Tools & Compressors

1 Answer

Air compressor w/5hp motor


Assuming that the motor is factory matched to pump, it should be powerful enough to turn the pump. Most problems with motors are related to pressure switch and/or capacitor. The pressure switch could have burned contacts causing low amps to reach the motor. The capacitor should test at least 90% of rated value printed on capacitor. Some volt meters have capacitor check setting. Also this motor at 5 hp must draw lots of amps. The outlet should be rated at least 20 amps and plug the compressor directly into oulet without an extension cord. \
Secondary problem is the in-tank check valve. The check valve should hold in tank pressure without leaking back to the head of the pump. If check valve leaks, replace it with any brand of same thread size. enjoy

Oct 29, 2008 | Air Tools & Compressors

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