Does it start when the tank is pressurized?
SOURCE: owners manual ruined. what type of oil do i fill w before use
you should be able to find the manual online if it's available if not Sears would I'm sure be able to tell you.
SOURCE: AIR LEAK ON CRAFTSMAN AIR COMPRESSOR, 3HP,25 GAL, HORIZ TANK
The needle valve that you see is the unloader which releases air pressure from the discharge line after set pressure is obtained. If air continues to leak after the compressor shuts off, the check valve installed in the tank is leaking air out of the tank. Follow the air discharge line from the compressor to the tank. There you will find a brass valve which is the check valve. Simple test is to remove the smaller airline (1/4") from the brass valve and check for air leaking. If leaking remove brass valve and check for debris under the white seat. If you cannot clean the valve, replace with generic check valve from www.grainger.com. It will cost less than factory part. Just order the valve considering the fitting sizes that you need. For exact replacement,( www.sears.com parts). If you sears model # begins with WL then your compressor is made by campbell hausfeld and parts may be ordered from www.chpower.com. Good Luck with you repair and email if you have more questions.
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: My 5 hp, 25 Gal. Craftsman air compressor is
It sounds like your intake valve is worn or defective. Take the head apart again and look to see if the valve is sealing properly. If you post a comment with your model number I can look up the specific parts at sears parts.
If your compressor is functioning properly, air should not come out of the intake muffler (filter)
Thanks,
Tim
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