[Shop-talk] Compressor problem

[Scott Hall]

Fellas,

Looking at a used Quincy compressor. The data plate calls it an ATV5. it's
a two-stage.

It runs fine until it reaches about 150 psi, then the belt starts to squeal
like the pump is dragging. Does that sound like a common problem?

I figure:

1) The pistons are expanding, dragging the pump.

2) The valves aren't closing behind the compressed air, allowing it to
'push back' against the pistons.

I can't disassemble the thing, but a new pump is almost as much as just
buying a new compressor. Any guesses on if I should take a flyer and try to
rebuild it?

Thanks in advance.
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