If you have the model number in the sears format (Example:106.48062890) you
can find exploded views and parts lists at
Did it used to go above 85PSI?
If the motor shuts off before getting to max pressure, then suspect a bad
If it justs keeps running without shutting off at the regulator switch
setting, then suspect worn rings or leaking internal valves ( most commonly
these are reed valves) if its a piston model - leaking diaphram or valves if
diaphram model. It could also be the safety/pop-off valve leaking.
Check and change oil regularly, and drain condesate regularly to prevent
How are you judging 85 lbs? Do you have another gauge or can you
put a tire gauge on a fitting to check it? Try to perform this
check ahead of the regulator. This would tell you what the
compressor is producing.
The regulator has little to do with the pressure that a compressor
can produce. All it does is allow delivery of the already
compressed air at a "regulated" pressure.
It would help all of us to know whether this is a new-to-you
compressor or one you've had for some time. Is this a new
development? There is box close to or actually where the cord
goes to the compressor. This box senses the maximum pressure and
shuts off the compressor and establishes the come-back-on
pressure. This thing is called a pressure switch, here is a
These are adjustable to different settings. Many times the
differential between stop and run is not adjustable.
A live Singing Valentine quartet,
Thanks all for the help. My compressor is about 10 years old. Until
recently it would go to approx. 120 psi.
I have two gauges. Looks like one is the tank pressure and the other the
delivered pressure. The motor will shutoff when it (the tank pressure)
reaches 85psi, so I think it is capable of higher pressures.
I'll take a look at the pressure switch to see if it is adjustable.
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