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Allis Chalmers Discussion Forum

7060 air conditioning problem

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Author  [Modern View]

08-25-2016 18:49:53

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Got a new to us 7060. Previous owner said the air works but have to add free on once in awhile. It was updated to the 134a at sometime. Anyways I added 3 lbs of free on. The clutch on the compressor runs and works. The low pressure line got cold and frosted up. But no cold air in the cab. The high pressure line doesn't get hot at all. Its like it's not circulating. I tried to look in the window on the reviever dryer for circulation but can't see through the glass. I then shut tractor off and later started it and now the line doesn't get cold anymore. Could a sensor be bad or a plugged dryer? Any help would be appreciated. Thank you

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09-17-2016 16:34:14

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 Re: 7060 air conditioning problem in reply to Cjrpr, 08-25-2016 18:49:53  
It sounds like too much Freon. The bubble normally do not clear up with R134A. You need to use gages.

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08-28-2016 11:55:06

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 Re: 7060 air conditioning problem in reply to Cjrpr, 08-25-2016 18:49:53  
Quoting Removed, click Modern View to see

Yes the Exp valve is under the roof. The drier is under the rear of the cab on the step side of the tractor.

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08-26-2016 13:43:07

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 Re: 7060 air conditioning problem in reply to Cjrpr, 08-25-2016 18:49:53  
Sounds to me like you're not using a set of GAUGES. Hard to diagnose problems without accurate numbers. Sounds like a blown-up dryer that plugged the expansion valve. Hose between the two will need to be flushed.

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Gary H.

08-26-2016 12:06:30

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 Re: 7060 air conditioning problem in reply to Cjrpr, 08-25-2016 18:49:53  
Sounds like the expansion valve is plugged. You'll have to evacuate the system and flush. Replace the expansion valve and drier. Vacuum down and recharge.

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08-27-2016 09:00:21

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 Re: 7060 air conditioning problem in reply to Gary H., 08-26-2016 12:06:30  
Is the expansion valve under the cab roof? Not too familiar with Alli's Chalmers ac system.

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