My Craftsman air compressor #919 167 37, 17 gal, 1.1hp does not work. The sound is something more like a wet-vac, and I believe it to be the relief valve. I don't have an owners' manual, and need to know what type of bolts, screws, or whatever is holding on the top cover. They are recessed too far inside to see. Also how do I get an owners' manual?

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: My craftsman 3 gal. air compressor, 921.153101 won't compress air

I WOULD TRY DISCONNECTING THE PIPING FROM THE HEAD DOWN TO THE TANK AND SEE IF ITS BLOWING AIR. COULD THE COMPRESSOR BE RUNNING BACKWARDS - YOU WOULD HAVE HAD TO CHANGE THE WIRING IN THE MOTOR.
VALVES IN THE HEAD COULD ALSO BE BROKEN. YOU CAN REMOVE THE INTAKE AND IT SHOULD **** YOUR FINGERS AT THE OPENING. HOPE THIS HELPS.

SOURCE: need to replace drain valve

The "welded nut" is the pipe fitting into which the drain valve or drain plug is screwed. It's usually brass and the valve or plug can be obtained through Sears or possibly and good harwarde store. Be sure to use pipe sealing compound or teflon tape on the threads when you re-install the valve or plug.

NOTE - THE AIR MUST BE DRAINED FROM THE TANK BEFORE REMOVING THE VALVE OR PLUG. ALSO, POWER SHOULD BE DISCONNECTED FROM THE COMPRESSOR!

SOURCE: The compressor relief valve keeps popping, compressor runs

What pressure is it popping off at? You might have to adjust the pressure switch to a lower setting.

SOURCE: HUSKY PRO AIR COMPRESSOR 30 GAL I NEED TO KNOW HOW

Depends on what plan it was made in...
If you have the glass type sight... Only to the max you can see (top of site), then run it for a few mins, let it sit for a few more mins then add more if the level is near the bottom of the sight glass.

If it's the dipstick model that pushed in, there will be an upper and a lower level mark (holes, or checkered section) Keep it between the top and bottom marks.

Finally if it's the older screw-in type, remove the dipstick and wipe it. Set it back in BUT don't screw it in. Keep within the range on the dipstick from that position. Then of course screw it back in/

Good luck