[Shop-talk] Compressor problem

[old dirtbeard]

Hi Scott,

I know it is too obvious to ask, but have you tried tightening or dressing
the belt? The fact that it runs up to 150 psi and then slips might indicate
a belt problem. If it stalled the motor, caused the breaker to pop, etc.,
then I would be more inclined to think of internal mechanical problems.

best,

doug

On Tue, Mar 30, 2021 at 3:52 PM Scott Hall <scott.hall.personal at gmail.com>
wrote:

> 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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