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Old 05-18-2007, 09:21 AM
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My LOUD Viair 550?

Greetings,

I got this compressor from ebay no manual over two years ago with low usage. After wiring it up, after about 30 seconds it starts getting very loud to point of annoyment. Any suggestions how I should proceed to troubleshoot this issue?

Loco

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Old 05-18-2007, 09:57 AM
boatbob2
 
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compressor

hi,did you check the compressor oil?if ok,drain oil and add stp plus oil to full line,if this doesnt help.time for a pump rebuild. DO NOT buy a new pump from harbor freight,ive bought 2 and no luck with either one.
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Old 05-18-2007, 10:51 AM
F&J F&J is offline
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I'm not up on that brand but:

Some compressors have a check valve mounted at the top of the tank. The valve is needed so when it restarts at 90psi or so, the compressor can restart without strain. I had one valve that got real noisy and the check ball was banging, metal-to-metal, and was amplified by the hollow tank. I took the valve apart and saw that the teflon seals were chewed up. With good seals, then there was no metal to metal banging.

I also bought a new oil-less Sears 5 hp, and that is so noisy after the pressure starts to go up, that I don't even use it anymore. I was told that oil-less are very noisy.

Not to get you to try something dangerous but: If you have a real long screwdriver with a plastic handle, you just place the tip of the driver on the relief valve or the crankcase of the compressor and then hold the handle tight to your ear. You need to be careful not to slip and hit the moving belts or pulleys, or get your clothes or hair too close to the belts either. You should be able to hear where it is coming from.
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Old 05-21-2007, 07:55 AM
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Thanks for the input. I will add some oil to it before taking it apart. My plans for airbags are on hold til this is fixed
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Old 05-22-2007, 05:52 PM
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i would almost bet that your problem is a check valve, i had a viar 450 i broke the leader hose on it and made on up and the compressor did the same thing it got so loud it would vibrate the truck the check valve was in my lewader hose i broke and i didnt know it at the time i would say go to www.gauge.com or suicidedoors.com and see about a chekc valve
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Old 05-23-2007, 06:24 AM
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Thanks for the additional information. I'll contact suicidedoors and see what they have in stock. I'm sure they have some other items I need to order.
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