919.165611 60 Gallon 7 hp motor trips breaker

by Dale
(Springfield, MO)

I have the 919.165611 60 Gallon 7 HP motor that trips breaker every time I attempt to turn it on.


It runs for a split second and then trips the breaker.

After doing research, I am no closer to figuring it out, i guess I have it narrowed down to motor start capacitor, unloder valve(can't find this on diagram in owners manual ANYWHERE), and centrifuge?????? Any recommendations?
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Dale, see the troubleshooting section on the sitemap page, and read the pages about why air compressors will not start. The fundamentals are pretty much the same, regardless of the size of the reciprocating air compressor.

The unloader valve is typically operated by the pressure switch, whether an external unloader operated by a toggle from the side of the switch or and internal unloader operated from inside the pressure switch. Emulate the unloader valve operation by opening the tank drain and voiding all air from the compressor tank. If the air compressor starts after that, then the problem is quite likely a failure of the unloader valve.

Comment here with findings if you wish.

Bill

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Jun 19, 2013
Tank is empty
by: Dale

Capacitors all check out. Plugged in to dedicated 20 amp outlet just installed. Being told motor probably bad??? Could it be the switch? That's a TON cheaper!
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I don't think a 20 amp breaker is big enough for your 7 HP compressor, Dale.

This is from: http://www.engineeringtoolbox.com/elctrical-motor-full-load-current-d_1499.html

As a "rules of thumb" amps horsepower rating can be estimated as

115 Volts motor - single-phase : 14 amps/hp
230 Volts motor - single-phase : 7 amps/hp
230 Volts motor - 3-phase : 2.5 amps/hp
460 Volts motor - 3-phase : 1.25 amps/hp

Bill

Jun 19, 2013
Tank is completely empty
by: Dale

had the capacitors checked, and they all check out fine. I am being told bad motor. Could it be the switch? A new motor is like $800. I'd buy a new one before I replaced the motor.

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craftsman 30gal 5.5hp how do i figure out the electrical problem?

by lacey
(lawton, ok, usa)

I have a craftsman 30gal 5.5hp oil less air compressormodle number- 919.165310, the electrical engine will not start.
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Start by looking under troubleshooting on the sitemap page for links to pages about why air compressors will not start.

Review the info, do any checks noted there, then add a comment here with what you found.

Bill

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