919.165090 compressor starts, then won't restart and trips the breaker.

by Rod
(Sonora, Ca)

I have a craftsman compressor, mod# 919.165090.

When the tank is empty it starts right up and cuts off at 80#. If I run the tank pressure down, it will hum but won't start and will trip the breaker.

I plugged it into a separate circuit and it still does this.

I have 2 somewhat cylindrical components that wire into the compressor motor. I assume that one is the start capacitor but have no idea what the other might be. One is black plastic and the other is a white,paper wrapped, rolled up substance. (no clue).

This is a relativly new problem. Can you help please? Sears won't help unless I pay a $99 Diognostic fee, then pay to have it fixed.
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See how inexpensive about-air-compressors.com is? :-)

As a comment here, tell me what happens when you empty the compressor tank completely by draining the tank with the tank drain, or using the PRV.

Did the compressor start with an empty tank?

Bill

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Nov 13, 2013
reply
by: Rod

Yes. If I take the pressure off the tank it will restart. It just won't come up to full pressure or restart on a normal cycle.
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Assuming you've got a good power supply, no extension cords or power bars, and a 20 amp circuit, then I would think that your start / run capacitor is pooched.

See the page on this site about how to check.

B.

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motor started smoking model no. 919.152932

by Bob Yates
(Iuka, Ms USA)

motor started smoking while running to compress air in tank.

What is the problem?
Do I need a new motor or can this one be fixed?
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A smoking motor is quite likely one that has been overheated.

I don't know the conditions under which it was running, nor do I know about the power supply to this compressor, both of which could have an impact.

Depending on the severity of the overheating, if that was what it was, the compressor motor may have been damaged beyond repair.

If the power was good (20 amp breaker, no extension cord, no power bar, no other applicances using power at the same time on the same circuit) then the motor might just be wearing out.

No way I can tell from here, Bob. Sorry chum. You need to get the motor into a shop to get the motor checked. An electric motor rebuilder could probably do that for you.

Bill

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919.175251 basics - tiny holes in oil filler plug

by Howard
(New City, NY)

Holes in 919.175251 oil fillter plug

Holes in 919.175251 oil fillter plug

Hi, I purchased a Craftsman 919.175251 from the previous owner of my house, so this compressor is new to me.

The oil filler plug has two small holes near the top on opposite sides of each other that look like they belong there.

But air comes out of them when the compressor is off (maybe when on also, I didn't check), slowly draining it. I'd be surprised if this is normal so wanted to ask here what the problem might be.

Picture attached with arrow pointing to the hole (there is another hole on the opposite side).

Thanks for any input,
Howard
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Howard, the holes are there on purpose to allow the oil sump to vent as needed.

That you have air blowing out of them when the compressor is stopped suggest to me that you have an air line with a checked coupler, so no air is blowing out of the air line when you aren't using an air tool, that your tank check valve is leaking, and that you have air bleeding past the tank check valve, pressurizing the area over the piston, and, since your piston seals are worn, air is blowing by them, down into the sump, and out the sump vent.

Cheers,

Bill

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919.184190 oil seal blows off the back of the pump.

Once the compressor (model 919.184190) gets up to about 140-150 psi the oil seal on the back of the pump blows out.

Does this mean my piston seals are bad and air is getting into the pump causing a buildup of pressure?
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I see from the parts list that the sump has a fill plug, but no apparent vent. Too bad. Then the air getting into the sump past the piston seals could vent without blowing the seal.

I think you are on the money with your diagnosis, though, there must be a ton of air getting into the sump to blow the oil seal.

Bill



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