921.164710 cutting off at 50psi. already replaced switch and adjusted it.

by Jon Mitchell
(Fairfax)

Craftsman 921.164710 air compressor

Craftsman 921.164710 air compressor

I have the 921.164710 and it was shutting off at 50psi.


I adjusted the cutout and it didn't change anything.

I replaced the switch for $75 and its still cutting off at 50psi, even after adjusting the cut out again.

Please someone have some insight on this.

Thanks

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Aug 18, 2015
Same model, same problem (I think)
by: Kenny

I believe that I am having the same issue and that Mike is correct that it is just a coincidence that the unit is cutting out at 50 psi and that it is probably thermal overload.

Mine cuts out @ 50-60 psi and cylinder head, outlet tube, check valve, and relief tube are scorching hot yet motor housing below valve plate is not.

If I turn off, unplug, and let cool for 10 minutes, it will start back up until it overheats again.

I've tested wall outlet and capacitors, both are good.

I've replaced the pressure switch, check valve (accidentally broke it), and valve plate/gaskets but still cutting out.

Piston and cylinder show no signs of damage that I can see.

Don't know what else to check at this point, any suggestions?

Sep 08, 2014
Clarifying condition
by: Mike P in Vegas

Is it possible that it's a coincidence that the compressor is shutting-off — due to a thermal, over-heating condition — which coincides with the tank's capacity to hold roughly 50 psi?

Try this: with the tank completely EMPTY of all air/pressure, run the compressor and see what pressure you hit when it cuts-off. Time this as well, and try to assess the temperature of the compressor motor (without burning your hand of course).

Repeat this test using a partially-charged tank/reservoir.

See if your times (for auto cut-off) are the same, and/or if this confirms, it's a 50psi rating consistency.

Sep 08, 2014
cut out
by: Doug in s.d.ca

What is cutting out?

Is it bogging down?

What happens if you run down the air pressure after it stops? Will it restart on its own in a predictable way (i.e., the same pressure?)

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6.5 hp craftsman oil less compressor shuts down after 10 min

by Richard
(kenner,la)

My compressor shuts down after 10 min or so of use.

It pump up to 140 psi an shuts off but motor will shut down and will not come back on after it warms up after use.

Is there a cut off switch on motor that has gone bad.

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Jul 17, 2014
No model number - no image
by: Bill

Not knowing the model number, I cannot try to find an image of the compressor to provide specific information.

It sounds as though the compressor is going off on thermal overload.

I suspect that the duty cycle of this compressor may be longer than 10 minutes, so that would mean that the motor is overheating sooner than it might.

That would suggest an issue with either the load on them motor or the motor itself.

It were mine, I'd be checking the run capacitor to see if that's failing. How to do so is found in troubleshooting on this site.

Bill

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Craftsman 60 gallon 7hp two stage cuts on and off

by James
(Kansas City, mo)

Compressor runs great when not connected to the tank.

When's it's connected to the tank and starts building air it starts cutting on and off and trips breaker.

Installed new pressure switch.

When you unhook the line going into the tank it runs fine and theirs lots of sir comeing out of the line.

As soon as you hook it back up and it starts building air in the tank it cuts on and off.

I looked inside the pressure switch and I can't tell where the switch might be kicking it on and off that part looks good.

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Aug 07, 2014
Craftsman compressor cuts on and off
by: Bill

James, I hope you didn't toss out the old pressure switch? If not, keep it as a spare, as I don't believe, based on what you have written, that there is anything wrong with it.

Your compressor symptoms suggest a power issue.

Assuming that your power feed to the compressor hasn't changed in any way, if this were my compressor, I'd be looking to both the run and start capacitors as being the potential problem causer.

See how to check capacitors on the page on this site.

Cheers,

Bill

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25g craftsman professional compressor 1.9 hp twin cylinder will not start

by mike
(chicago il usa)

it was working fine for 3hrs but then it just turn off and i just drained it because i was hoping it was going to start with the low pressure but no. i already check the circuit breakers at the house the socket on the garage the electric core on the compressor but its the same no start any ideas or suggestions
________________
Good that you checked power at the socket, Mike. Now, with the tank empty, your pressure switch should have tripped to passing, meaning that the power should be flowing across the switch to the motor circuit.

Your next check is to use a multi-meter to do that, from inside the pressure switch housing. Be careful, live wires.

Add a comment here with what you found.

Cheers,

Bill

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Aug 21, 2013
no start
by: mike

i have check the switch for power and i have power but i don't have power flowing to the motor also i had someone else connect the compressor and no sound on the switch, i took it apart and found that the metal contacts on the switch to the motor are burned i had the compressor running and at the same time i had a fun working in the same 2way electric socket does anyone knows were could i buy the pressure switch
_______________
Mike, Sears has a good parts network. Also, the store on this site has a number of pressure switches for sale.

B.

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