12 gallon 1 hp oil lubricated , model 921.166400 pressure problem
I recently returned my compressor to sears for repair and when i got it back it had the same issue as when I returned it. The issue is when I fill the tank up the regulator gauge also goes up even though I have the gauge turned down to zero this should no be and then I can't adjust the outgoing air pressure for the tool at all, it did not work like this when I purchase it 1 year ago.
Check the regulator for an arrow that shows direction of compressed air through it.
The arrow should point from the tank side towards the air tool or air use side.
I think your regulator may be plumbed in backwards. Is it?
Sears 3HP 30 Gal. 2 CYL leaking air
(Springdale, Pa 15144)
Just rebuilt head with all new flappers, restristors, head gasket and top plate gasket. Ran OK for a day then developed this problem. When compressor kicked on at 80# the tank pressure just sat at 80# and would not increase. Look for leaks and found air escaping from unloader valve that is installed in tank with the air line. (think is is Genie type). Removed valve, cleaned, not sticking seems to be functioning OK. Reinstalled,watched valve while tank was building pressure and found no air leaking out till tank pressure hit 80# then air started leaking out. Repeated this procedure 3 to 4 times and same result.Appears that the unloader is being forced closed at 80#. Could this be a bad valve or something with the head pressure not being able to go above 80# All help would be greatly appreciated.
Hello Donald, and thanks for writing in.
Have a look at the CHECK VALVE page, and how a leaking check valve can produce similar symptoms to those you've written about.
I suspect that at 80 PSI, you check valve starts to leak air.
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