In your cylinder head you have a broken reed or valve as some call them. I assume you have checked for a broken line or an open discharge valve? This is generally an easy fix and parts are mostly easy to obtain from your neighborhood NAPA.
SOURCE: coleman powermate inflationmate pump
The ring is gone on compressor. You can buy replacement pistons and rings from colemen. Comes with instructions.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: craftsman 1 gallon direct drive oil filled wont build air pressure
It sounds like you may have a broken reed on the diaphragm plate. This is located at the block. Remove the cover, and look for a cast metal assembly with fins. It will be attached to the side.
SOURCE: air compressor not building pressure
YOU MAY HAVE BROKEN OR CRACKED A FEED LINE REMOVE THE COVER LET IT RUN ,CHECK FOR LEAKS
SOURCE: air compressor slow to build air pressure.
you might need to checktosee if the filter is blocked or dirty were the air intake is just like a car dirt can build up there.
It could be that the input air filter is badly clogged. I might more likely be that the Non-return valve on the air tank input is not sealing properly and not allowing the tank to build up pressure. This valve is at the end of the main pipe runs between the compressor and tank. It could also mean (less likely) that the poppet valves inside the compressor cylinder head are not sealing properly. Other faults could be worn rings on the compressor pistons or a bad seal between the compressor cylinder head and block.
To check the Non return valve allow compressor to build up some pressure and then loosen union nut on Non return valve. There should be some air released at first but should stop if valve is ok. If leaking remove valve and check for dirt and clean. If valve still leaks replacement is the only fix.
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