tractor air conditioning question

morgan in ar · Apr 7, 2015

I am working on an agco allis 6680. I have not used the air in several years. Last time I was using it, I would charge it up, and it would leak out in about a day. I charged it up today and set out to find the leak. I took a spray bottle of soapy water and sprayed the compressor, lines, collector, and evaporator. I can't get to the condenser without unhooking the lines. I couldn't find any leaks. The system held a charge all day. What gives? Is it possible for it to only leak when running? Is it possible that some old stop leak in the system took hold over the years? I really don't know much about air, so any help would be appreciated!

nhboyd · Apr 7, 2015

compressor shaft seal

ditchwitch · Apr 7, 2015

You can buy a bottle of dye and put in there. Then run it for a while. They make a small black light bout the size of a flashlight and it will light up the dye then you can tell where its leaking from. Same process is used in cars also.

showcrop · Apr 7, 2015

I wouldn't recommend stop leak. A friend suggested it once and it plugged the receiver drier so that the system wouldn't work at all.

Bob · Apr 7, 2015

AC dye is NASTY stuff when someone has to open the system and work on it.

Start by looking for areas at fittings or around the clutch (shaft seal) where dust is sticking to the oil that leaks out with the refrigerant. Serves the same purpose as the dye without the added MESS.

da.bees · Apr 7, 2015

A leak that emptys system in one day is huge and should be easy to find. So huge in fact it might blow soap away whithout making bubbles. To answer one question,yes it's possible that an a/c only leaks while in use. If that proves to be the case that narrows the leak to high side of system. Regarding dye,if you use the glow under black light kind,be very carful not to vent any while charging it in. It will coat everything in sight and make it glow.

Tx Jim · Apr 8, 2015

I will guess the quick disconnect when one attaches the gauges is your leak problem. Quick disconnect just happened to seal this time when hoses were disconnected..

hd6gtom · Apr 8, 2015

forget about the soapy water, get your self some leak detector made for that system. experience speaking here.

87nassaublue · Apr 8, 2015

You need to go over it with a leak detector. I have one made for Snap on that costs under $100. It will save you money and frustration.

Texasmark1 · Apr 9, 2015

+1 on that. I changed one out once on a GM compressor. Friend had the tool that you need. Seal was reasonable.

If you are leaking out that fast, soap and water should find it if in a line or connection. With the seal leaking, you have to be running to find it and since you can't get to the compressor, you can't find it anyway.

You might be able to get the part and go to a dealer's service dept with the compressor and have them just change the seal. No guarantee, no checkout, or if he has the part buy it from him and have it installed.....they should have the tools for installation.

Then bring it home, hook it all back up, evacuate the system properly and add your new freon. So, what freon is it designed for and what are you using?

Mark

tractor air conditioning question

morgan in ar

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nhboyd

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ditchwitch

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showcrop

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Bob

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da.bees

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Tx Jim

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hd6gtom

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87nassaublue

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Texasmark1

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