<div dir="ltr">Hi Scott,<div><br></div><div>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.</div><div><br></div><div>best,</div><div><br></div><div>doug</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Mar 30, 2021 at 3:52 PM Scott Hall <<a href="mailto:scott.hall.personal@gmail.com">scott.hall.personal@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Fellas,<div><br></div><div>Looking at a used Quincy compressor. The data plate calls it an ATV5. it's a two-stage.</div><div><br></div><div>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?</div><div><br>I figure:</div><div><br></div><div>1) The pistons are expanding, dragging the pump.</div><div><br></div><div>2) The valves aren't closing behind the compressed air, allowing it to 'push back' against the pistons.</div><div><br></div><div>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?</div><div><br></div><div>Thanks in advance.</div></div>
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