Remove the belt and try to turn the pump pulley by hand. It should have a little resistance on compression strokes but otherwise turn fairly easily and smoothly. If you have to really lean on it or it won't turn at all you have bearing problems inside the pump. The most common proplem is after running the pump with low, old or no oil, the piston con-rod(s) seize to the crank shaft.
SOURCE: 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
SOURCE: coleman compressor no build up of pressure
your correct either the valves are worn or maybe just need cleaning as for the gaskets,idont know what part of the world your in but check out coleman on the internet or failing that ,i have maid these from gasket material suuplied from my local bearing supplier
SOURCE: coleman compressor no build up of pressure
Parts for coleman are available at www.mastertoolrepair.com your compressor is listed as L0502710. If however you like to tinker, you can make a pretty good reed valve out of aluminum can material or other (any ideas?). It is fairly easy to cut, does not last as long as factory stainless steel, but for short term, why not? Good Luck
SOURCE: 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
SOURCE: I have a Husky model Y6010 air compressor.
First remove the valve using probably about a 1/2" wrench but make sure there is no pressure in the tank before you do so. check the cone and seal by loosening the valve by hand and check for debris. If there is no debris then the problem is either the pressure relief valve or weak pressure regulator but may also be a bad piston seal if it is a direct drive unit.
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