My 921.164710 cutting off at 50psi even though I already replaced switch and adjusted it?
by Jon Mitchell
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.
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?)
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.
Same model, same problem (I think)
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?
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