I have a Speedaire M/N 3Z492 and it vibrates after it gets warmed up

by Durwin Mitschke
(Houston, TX)

I was performing maintenance on the pump by changing the oil.

The oil was a milky color.

I took the site glass off and put my finger inside the oil reservoir and it had about 1/8 of an inch or more of oily sludge in it. I put about 1 3/4 quarts of oil and 1/4 quart of engine flush and let it run for about ten minutes to loosen up the sludge.

I then drained the oil and put fresh oil back in.

I drained the air out of the tank to about 80psi so the pump would start running. The pressure reached about 100psi and then the compressor unit started shaking and making noise.

It was doing this before I changed oil. I thought maybe the sludge was causing the problem in the first place. Any ideas as to what could be causing the compressor to shake? I do not have a manual.

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Bill says....

Durwin, the most obvious thing to check are the motor mounts. Make sure that the motor is attached securely, and if there are elastomeric mounts between the motor and the base, that they are in place.

If they check out, add a comment here and we will delve deeper.

Cheers,

Bill




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I have a Speedaire M/N 3Z492 and it vibrates after it gets warmed up

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Nov 17, 2011
 It is not the motor mounts
by: Anonymous

I did some testing on the compressor and determined that it does not start shaking until the pressure reads about 105 psi. I did this several times and it was consistent at the 105 psi pressure.

I also timed the amount of time it took to reach the 105 psi pressure reading from a totally empty tank (0 psi) and it took 3 minuts and 25 sec. I do not know if that is a normal amount of time. Any answers?

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A motor mount was too easy, I guess.

That the compressor does not start vibrating until 105 PSI suggests the issue is load related.

If it were a damaged or misaligned drive, the vibration would be occurring all the time, unless, the increasing load is affecting or deflecting a bearing.

Anyone else?

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