30L air compressor

Submitted: Saturday, Mar 24, 2012 at 11:19
ThreadID: 92742 Views:1804 Replies:4 FollowUps:2
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I have a 30L GMC air compressor which has given good service until now.

It now leaks all air (gauges are zero) and I can't find where from to fix it.
It appears to come from near the switch area but I can't find a constant stream of air.

Any ideas?????

Alan
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Reply By: Member - Toyocrusa (NSW) - Saturday, Mar 24, 2012 at 11:56

Saturday, Mar 24, 2012 at 11:56
Hi Alan. It should have a pressure switch to turn it off at a set pressure. This could be incorparated in the on/off switch. If so it will be connected down into the tank to sense the air pressure. Cheers,Bob.
AnswerID: 481251

Reply By: Ozhumvee - Saturday, Mar 24, 2012 at 14:02

Saturday, Mar 24, 2012 at 14:02
The pressure switches have a diaphragm which sounds like it has ruptured allowing the air to escape inside the switch. Unless you are familiar with working on 240v best to get an electrician to look at it, you can buy the whole switch on ebay or elsewhere and have it replaced. Will probably cost more then the compressor cost originally though ;-))
Peter
1996 Oka Motorhome

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AnswerID: 481259

Reply By: Member - Alan H (QLD) - Saturday, Mar 24, 2012 at 14:19

Saturday, Mar 24, 2012 at 14:19
Thanks for the replies.

It looks like a new compressor. What a waste of resources.

Alan
AnswerID: 481262

Follow Up By: Shaker - Saturday, Mar 24, 2012 at 16:42

Saturday, Mar 24, 2012 at 16:42
It's hardly worth worrying about, you can replace it for around $99.00!
Have you checked the valve discs under the cylinder head? Mine were stuck.
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FollowupID: 756640

Reply By: Allan B (Member, SunCoast) - Saturday, Mar 24, 2012 at 14:55

Saturday, Mar 24, 2012 at 14:55
Hi Alan, many compressors incorporate an "unloader" which vents air between a non-return valve on the tank and the compressor delivery port. The unloader makes it easier for the motor to start, then closes the vent once the motor is up to speed. If the unloader is stuck in the open position then the compressor output will continue to vent and not build up pressure in the tank. This could be the cause of your problem.

Cheers
Allan

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AnswerID: 481263

Follow Up By: Member - Alan H (QLD) - Saturday, Mar 24, 2012 at 15:51

Saturday, Mar 24, 2012 at 15:51
Thanks for that.

I have gambled $10 and bought a new switch on ebay.
Hopefully it will arrive and the compressor will work again.
I'll keep the forum notified of my progress.

Alan
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FollowupID: 756634

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