919. 156650 PRESSURE SWITCH - HOW IT GOES BACK TOGETHER

by JAMES
(OKC.OKLA.)

I DISASSEMBLED PRESSURE SWITCH IS THERE SOME INFORMATION ON HOW IT GOES BACK TOGETHER IF NOT WHAT IS A CHEEP ONE FOR REPLACEMENT

_________________
The number provided is the model of the compressor, unfortunately, not of the switch.

I don't know of any user serviceable parts in the typical compressor pressure switch, James. Nor have I attempted to rebuild one.

According to Craftsman, the replacement pressure switch for your compressor is PART NUMBER: CAC-4221-1 which you can obtain from their parts department: www.searspartsdirect.com .

If the $57 bucks they want is too much, take your switch (pieces of it, at least) to the hardware store that sells compressors, and see if you can find one there that is similar.

I suspect that it will be one of two makes, and if you can plumb it properly, an off brand should work just fine. Try to get one with the same general cut in and cut out, and make sure it connects to your unloader properly.

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Craftsman Compressor Issues.

Compressor pressure switch? - won't turn back on

I just got a craftsman 5.5 hp 30 gallon compressor used.

It charges up but when I try to use it it will charge up to 125 and as the pressure drops it stops working.

It only does this when the psi is set above 60 or so.

When this happens, it won't turn back on unless I take the plastic cap off the pressure switch and hit that manual button that says motor under the plastic top.

When I do that, it turns back on and if I kick the pressure back down to the 60-80 range it works fine.
________________
Drain all the air from the tank, start the compressor (stop hitting the pressure switch) and if it starts, monitor it closely as it approaches the cut our pressure setting.

When it reaches cut out and stops, did the unloader valve work?

Cheers,

Bill

Comments for Compressor pressure switch? - won't turn back on

Click here to add your own comments

Mar 13, 2012
Valve
by: Anonymous

Yep I know which one your talking about. No air ever comes out of that valve so that is probably the problem? I need to do a paint job with it this weekend and it seems to be working fine at 60psi. Will it probably be fine as long as I don't try to set the psi too high? Does it work at 60 because there isn't too much pressure pulling on the electricity?

______________
The pressure over the piston is adding too much load to the motor. By draining down the tank you are allowing that pressure to vent.

If you need to run your air compressor, start with an empty tank.


Mar 13, 2012
Valve
by: Anonymous

I'm at work right now but the unloader valve is the little valve with the ring on it that you pull to release air under the pressure switch right? The only way it releases air is if I pull it with the ring. Otherwise, there is no "hiss" sound when it reaches cutoff pressure.
______________
Nope, that's the PRV. See the pages on pressure switches, unloader valves on this site for details.

Click here to add your own comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Craftsman Compressor Issues.