Let it cool down and see if it will restart. The brushes could be worn. Tap the motor while pressing the start button. If it goes, then that is what the problem is.
SOURCE: compressor clutch does not engage--100 psi in system-
Here is a link that i hope will help you. Keep me posted and be glad to help you but i am on my way out.
Good luck and hope this helps.http://www.cyberbright.com/autobin/air_conditioning.htm
SOURCE: Craftman 3gal/1hp air compressor runs normal, but
Chek for pressure BEFORE REGULATOR,if the problem remains worn rings or valve seats most likely source of trouble.
SOURCE: I have a small central pneumatic air compressor it
Most of the time the air flow rating for the air tools you are trying to use are rated higher than your unit, Check the lable on the tools and compare to your compressor, otherwise you have have some type of restriction in the air line or within the tool itself. Hope this helps.
SOURCE: I have an older model Sears Craftsman air
Could be the bearing in the pully wheel rides on,,not the belt,,,While its running spray some belt dressing on belt to see if its the belt,,,while running get a can of wd-40 with long nosel attachment and spray the armeture that tures pully when you spray it if its the bearing it will stop makeing noise momentarly, than come back again than as you spray it it will stop as long as you spray. BE CAREFUL. Bearings wear out when old,,,like us!
SOURCE: I need an owners manual
HF has this posted in PDF on their website:
http://images.harborfreight.com/manuals/90000-90999/90234.pdf
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