speedaire 3Z424E - Fly wheel rocks back and forth

by mholes04@hotmail.com
(Fairbury Nebraska)

My Fly wheel rocks back and forth when you jiggle it. it doesn't fit tight against the pump. and my pump doesn't work very well, it leaks oil and doesn't compress air very well, there isn't much resistance when you turn the flywheel by hand.

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Bearings failing? What symptoms tell you your pump doesn't work well?

Sounds like a compressor in bad shape. As far as I'm able to determine, it's obsolete, as Grainger shows no current model air compressor with your model number.

Good luck,

Bill

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5Z405A - relief valve continuously blows

by Chris
(Buckeye, AZ)

I have a Speedaire 5Z405A twin cylinder compressor. One of the 75PSI reliefs for one outlet tube continuously relieves air as the compressor tank pressure increases over 100psi. I switched the relief with the other side (cylinder) and the problem stays with the cylinder not the relief valve. When shutting off power there is a clicking noise from the crankcase until you manually relieve the pressure on the cylinder with the relief that blows. Is this a valve problem in the cylinder itself?
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Chris... if the PRV that's set for 75 PSI is blowing off when pressure in the tank reaches 100 PSI, then some of that tank pressure is back-flowing and pressurizing the line to blow off the PRV.

I'd look to the intake valve on the cylinder with the line that has the blowing off PRV.

Get that fixed, and then look to the unloader valve for a possible resolution to your compressors other problem.

Cheers,

Bill

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Direction of the pump

by Paul
(Menifee)

I bought Speedaire compressor model # 4ME98 with compressor model # DP500002av. I need to know which direction is the pump turns. I am buying a new motor single phase to replace three phase motor.

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Bill says...

Paul, you need to get the "official" word from Grainger as to their recommendation, though, as I think about your question, I wonder what difference does the pump shaft rotation make?

The pump has a piston that moves up and down as the crank turns. Presumably the crank can turn in either direction, and the piston doesn't care. It still goes up and down pulling in air and driving it down into the tank.

I am curious to what the "official" word is. Maybe you can post here as a comment after you hear from Grainger?

Cheers,

Bill

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