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Old 04-23-2019, 09:40 PM   #1
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PM on Air Compressors?

Well, I wasn't sure where to post this one, but I was wondering what preventative maintenance should be performed on the compressor and other components of the air system.

All my lines look good and I don't have much water that comes out when I release the valve in the wet tank (accumulator tank?).

Everything seems to be working well except now the compressor squeals when she gets close to the 120 psi mark. Goes away when the PSHHHH (don't remember the name) happens. Something I can do to help this old beast? Or am I in the throws of death with my dear compressor?

Anything else, me or others should be doing or keeping an eye?
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Old 04-24-2019, 07:19 AM   #2
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Place a paper towel or cardboard under your air dryer (the thing that goes pshh) and see if its water or oil, same at your air tank drains. A little oil is fine but if it gets excessive it can Start to gunk up components. The air dryer itself has a filter in it, if you haven't changed it out yet i would for peace of mind.

Edit: have you checked your belt? The squealing could just be your belt slipping.
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Old 04-24-2019, 07:48 AM   #3
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Quote:
Originally Posted by Eclipse436 View Post
Place a paper towel or cardboard under your air dryer (the thing that goes pshh) and see if its water or oil, same at your air tank drains. A little oil is fine but if it gets excessive it can Start to gunk up components. The air dryer itself has a filter in it, if you haven't changed it out yet i would for peace of mind.

Edit: have you checked your belt? The squealing could just be your belt slipping.


I will check the belt again. Would it be from being old or being loose?

Will try the cardboard thing as well. Might as well change the filter, either way. No telling when it was changed. Thanks!
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Old 04-24-2019, 04:35 PM   #4
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Belt could be squeaking from being loose or being old.
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Old 04-24-2019, 05:16 PM   #5
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When mine was squeaking it was from no lubrication just before it spun all the bearings.
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Old 04-24-2019, 06:08 PM   #6
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It's kind of a grinding squeal, hard to describe. Is there a lubricant that should be added to the compressor?
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Old 04-24-2019, 06:42 PM   #7
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Most compressors are lubricated by engine oil. If it's running dry, you'll want to make sure it's getting oil from the engine/oil pump. What's your oil pressure showing?
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Old 04-24-2019, 07:08 PM   #8
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Quote:
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It's kind of a grinding squeal, hard to describe. Is there a lubricant that should be added to the compressor?
It's pressure fed oil from the motor. That's what went on mine, no oil pressure, ran the pump dry and spun all the bearings. $300-$500+ to replace a compressor. They usually have a $500 core charge to deal with.
Grinding squeals are not good.
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Old 04-24-2019, 08:00 PM   #9
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Quote:
Originally Posted by Brad_SwiftFur View Post
Most compressors are lubricated by engine oil. If it's running dry, you'll want to make sure it's getting oil from the engine/oil pump. What's your oil pressure showing?
Pressure gauge show that it's good. Over halfway.
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Old 04-24-2019, 08:19 PM   #10
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Pressure gauge show that it's good. Over halfway.
I'm still trying to believe the issue I had on that bus. I drove it 12 miles showing no oil pressure, then the pump blew. I drove it the rest of the way home with no variation in brake pressure or heat. So another 10 miles with no pump and no oil pressure. The next day it would start but build no brake pressure.
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