zero pressure build up on a craftsman air compressor model 921.16472

by John
(MA)

I'm getting zero pressure build up in my compressor.


Unit is only a few years old with minimal use.

I disconnected the transfer tube from the pump and ran it to see if anything came out. No pressure at all.

Come to think of it, it has been struggling to build up pressure before this incident. But it always did manage to get up to the set pressure level and shut down. Any ideas would be helpful. Thanks
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John, good that you pulled the transfer tube to check pump outflow. Not good that you found none.

Pull the intake filter and feel if, when the compressor is running, it's pulling air into the pump.

From the description of your compressor symptoms, I would surmise a valve plate or pump gasket(s) failure.

Bill

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Apr 16, 2013
Pullng air in!
by: John

Thanks Bill. I took off the air filter and it is pulling air in. Not sure how much it should be, but if I put my hand up to it, it will pull it towards the opening. Do you still think it's your original diagnosis?
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Well John, if the compressor is pulling air in, and it's not pushing air out the port to the tank tube, then you've got an issue in the pump.

Is there air blowing out of the oil fill vent cap, if your compressor has one? If so, that points to a piston seal leak.

Otherwise, I would go with a valve and gasket kit.

B.

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air leak out vent hole Craftsman compressor model 106.153780

by Bob West
(Scottsburg IN, USA)

i have an old sears compressor model 106153780 and what seems to be an air vent right over the pulley shaft just all of a sudden started spewing air, since i'm not sure if it's a vent hole or oiler hole
i need help, whats the problem and how do i fix it

thanks
Bob
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Bob, I can't locate a photo of this Craftsman air compressor, so I cannot identify the hole you refer to.

If, in fact, the hole is an oil fill tube, that you now have air blowing out of it suggests that your piston seals are leaking. The more air coming out, the more the piston seals are leaking, at least, while the compressor is running.

If the air is blowing out of this hole and the air compressor is not running, then I would suspect a tank check valve.

Bill

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