12 gallon 1 hp oil lubricated , model 921.166400 pressure problem

by Tim

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.

Bill says....

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?



Comments for 12 gallon 1 hp oil lubricated , model 921.166400 pressure problem

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Nov 28, 2011
have same compressor
by: Scott

fill the compressor won't hold the air overnight?


You have a leak. Check all fittings with soapy water. If no leak found, I suspect your check valve may be the problem. See the Check Valve page for more details.

Apr 19, 2011
12 gallon 1 hp oil lubricated , model 921.166400
by: Susan R./searscares@searshc.com

Dear Tim:

My name is Susan and I am part of the Sears Cares Team. I am very concerned about what I have read here. We would like to help. We are a single point of contact for escalated concerns which means we step into a situation and handle it start to finish with one Case Manager. At your convenience, please send an email to smsupport@searshc.com with your contact phone number and any other information you would like to provide to us regarding this situation. We will get that information over to a Case Manager who will contact you so that you (and others) won't have to continue to be impacted by this. Also, please provide the screen name (Tim) for reference to your issue and we do look forward to talking to you soon.

Thank you,

Susan R.
Social Media Moderator
Sears Social Media Support

Dear Susan R:

Thank you Susan, as a representative of a large corporation, for taking note of the problems that many folks have with Sears / Craftsman compressors, for which they are not able to find solutions.

This website welcomes more than 500,000 unique visitors a year, and should you or your colleagues wish to help Sears / Craftsman compressor owners and users, I would be pleased to add any information you provide to the pages herein, with full attribution.

In particular, where do owners of Sears / Craftsman compressors find manuals and parts for current and older compressors?


Bill R.

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Sears 3HP 30 Gal. 2 CYL leaking air

by Donald
(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.

Bill says...

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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