Craftsman 919.167460 starts slowly and doesn't get up to speed

by Kenneth
(Metairie, LA)

A couple weeks ago, I turned on my compressor and it seemed to start somewhat normally. When I moved the compressor a bit, the motor slowed down and I instantly unplugged it. When I turn the compressor on, the motor doesn't kick off quickly but instead runs at maybe 500 RPMs. The cord feels too warm.

Started troubleshooting and only problem I saw was the black wire of the cord was disconnected from a terminal on the pressure switch. Made no difference as it probably was making some contact as it is quite tight in there.

The voltage to the pressure switch showed about 120 volts and climbed to 150 volts. I made jumper wires and bypassed the pressure switch with the same results.

Changed the start capacitor and didn't help.

The centrifugal operated switch for the start circuit looked to be good, but to be sure I manually closed the points with the same results.

I was thinking of changing the run capacitor, but could not find anything on the internet saying that it could cause the problem.

Both caps visually look good and seemed okay when checking with a digital multi-meter (no capacitance test).

The electric motor is clean inside with no dark spots or burned smell.

I ran out of ideas on what else to look at.

I hope you or someone can point me in the right direction to get it fixed as I feel it has lots of more life in it. Thanks all, Kenneth

Comments for Craftsman 919.167460 starts slowly and doesn't get up to speed

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Jul 02, 2016
compressor fix follow-up
by: Bill

Allow me, on behalf of Doug and myself, to say you are most welcome. Glad to have been of help, Kenneth.

Jul 02, 2016
compressor fix follow-up
by: Kenneth

I changed the run capacitor and it fixed the problem. Thanks Bill and Doug for the help.

Sep 18, 2015
run cap
by: Doug in

What Bill said -

And yes, the run cap could definitely cause this.

Sep 18, 2015
Craftsman 919.167460 starts slowly
by: Bill

Kenneth, you've done lots of major checks, all of which would be recommended by the troubleshooting pages on this site. Good on you for doing them and posting that you had done so.

I'm curious about the "moved the compressor". From where, to where, and how did that affect the power supply to the compressor. Longer runs for power, different - lower amperage - breaker perhaps.

Knowing that will help.

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