60 gal air compressor bogs down

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DesertRider

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One final thought, please, after you fine the problem, come back and let us know what it was... we all are interested in the solution or we wouldn’t be here.
 

RegularGuy

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Thanks, Blue Jay and Desert Rider! Desert, it was running fine until this problem surfaced. The oil is half way up the sight glass. I will report back about replacing the capacitors.
 

RegularGuy

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Hi Everyone!

Update: I replaced both the run capacitor and the start capacitor and it did not help. Any ideas guys?

Original post below:

I have a 2005, 60 gal., single stage, 7ph (peak), belt drive, Sanborn air compressor which is wired directly to the breaker box by a short piece of romex wire. It has performed well for 16 years until recently, receiving regular but modest use. All parts are original. Model LA7006056.

In recent months it performed fine at start up but then the motor slows down and has a lower, labored sound when the pressure is roughly 60psi, although the compressor did still go to its usual maximum (120psi or so) but perhaps more slowly than when the compressor was newer. Then last Saturday, it began sounding labored when the pressure built up to 30psi or so, and did not go beyond about 70 psi, although it continued to run while sounding labored.

If I open the tank’s petcock at the bottom of the tank, it runs fine and continues pumping air into the tank (which then leaks out the open petcock).

Help please.
 

oldognewtrick

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Are all the connections clean? Did you check them to be tight? Just throwing thoughts out...
 
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