Someone please figure this out !!

I have a warner swasey 500 trackhoe with a 3 cyl. 2 stroke jimmy in it. I turned my back on it for an hr. and the air compressor quit. (I shut it down for the hr.)) nothing is comming out of the cylinder head on the compressor. ((i put a straw in there where reed valve is and the piston goes up and down))
I can only figure the pistons don't move under load or there is no air getting to the suction side of the pistons.
HELP!

the compressor is a bendix westinghouse tu flo 500, i hope someone knows about these. I did get some diagrams off the internet but i'm worried the pistons won't move under much load........ (sheared keyway allowing shaft to turn when I bump the starter........ pull the bottom off compressor and pry on crankshaft of compressor? ...... gotta be an easier way.

Are you sure the pistons aren't moving when engine is running?

I have fixed at least a hundred bendix compressors, and all but one were valve or governor problems. I did see one partially stripped coupler that had me scratching my head for a few days, but I would surely totally rule out valve and control problems first. There are unloaders in the head that can stick and cause this problem, among other things.

Good luck

There is a fibre gear bonded to steel that goes onto the drive end of the crankshaft of the compresssor. The bonding came undone!!!, it wasn't easy to find since the darn thing would turn and pump when rotated by hand... .... and i even cranked the engine and watched the crank with a flashlight waiting for it to just nudge a little bit , jog or something but it wouldn't move......... and it didnt' when i got it in the shop till it cooled down and the tolerances changed........ then i found the hairline crack, (barely visible) ............ another lesson.

Glad you found it, and doesn't it feel good that it was you who figured it out? Congrats.

The one I had like that was on a E7 Mack, and was a partially stripped coupler way down in the engine. I replaced the compressor on that one, (it had over a million miles on it), and the new one worked for a day and quit, it was replaced under warranty, and then that one quit in a day or two. You could pull the compressor off, and the driveshaft would turn with the engine, and you couldn't turn it by hand, and the compressor would check out fine. You could put the compressor back on, and it would work fine for a day or so, then the whole mess would start over.

That had to of been a ruff ordeal, Not as bad as this one but this one had me thinking I was going bonkers or something.... '' I just KNOW that damn crank wasn't turning'' ......... and ''now it is''.
IF SOME MECHANICS WERE DOCTORS THE WORLD WOULD BE OVERPOPULATED!