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Hi Guys! I have a postscript for this thread and my sincere gratitude to all of you for helping me solve this problem. I found a solution to my lifting the interior hardwood floor which is about two inches above the concrete slab and is bowing for lack of support. I bought a 1-ton jack from...

Thanks, Bud!

Thank you for your thoughts, Buzz! Last night I did this test: I took off the air intake filter. I put 60psi of pressure into the tank and then shut the compressor off. I then opened the intake check valves with my finger. No air came out. This is my thinking: if the output check valve(s)...

Ok. Thanks, Bud.

The motor is: 3.1 RHP, 7 Peak HP, 3450 RPM, 56 Frame, 208/220 Volts, Single Phase, 5/8" Shaft The compressor is a single stage, belt drive Sanborn 60 gal compressor. The compressor is about 16 years old and gets regular light usage, e.g., 1/2 to 1 hour of usage per month.

Thanks for your in-put, Buzz. The belt works smoothly and it not loose but has the expected amount of resistance to turning which shows that it is moving the compressor when I turn the flywheel with my hand. KOK, I have an ordinary electrical tester. What amp readings are you suggesting...

Thank you for your reply, Hamberg! I did change the oil (full synthetic) last spring and it is half way up the sight glass, as the owner's manual specifies. I give the compressor light regular use, e.g., a half hour per month. Further thoughts, everyone?

Thanks, KOK, for your thoughts. But I am not quite following you, since I am not as handy as you are. I have a common electrical tester. What are you suggesting I do, and how? I have thoroughly read the owners manual. Specifically what issues with what internal valve please? Thank you in...

Thanks for your thoughts, Olddog. Yes, I did.

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...

Will do! Thanks again!

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.

Ok. Thank you, Buzz!

Ok. Thanks, Mike!

Hmmmm. Thanks, Eddie. I will have to consider how that applies. I am a beginner...

Thanks, Olddog. I did watch some y-tube videos. In the pdf image, the bump (capacitor) on the left is smaller and seemed to do what it is supposed to do when I tested it with my multimeter. (I don't have a micro-ferads tester.) When I used my analog ohms tester on the capacitor on the right...

Thanks, Olddog. I will do that

Yes. It has both.

Thanks, Olddog! I did check the air filter. It needed a clean (which I gave it) but then I tried the compressor again and the problem did not change. Bud, thanks for your help too. The only place to add oil is already at the proper level and was changed a few months ago. I grabbed the belt...

Hi Everyone! 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...