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Allis Chalmers Discussion Forum

AC 6080 question

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Longmeadow farm

03-28-2011 13:59:01

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I have a 1981 AC 6080 that I have mechanically rebuilt. Has 3672 original hours. Bought it about 5 years ago and noticed that it leaked transmission oil into the rear end hydraulic system/sump. It went from a nuisance to bad after a few years of heavy tillage work and as I don't have the capability to split the tractor, I took it my Agco dealer. After they replaced the drive shaft seal between the transmission and rear, it was ok for a season. Now it is starting to leak again. Any ideas on what is wrong?? Or what the Agco dealer didn't do?

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03-29-2011 19:29:29

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 Re: AC 6080 question in reply to Longmeadow farm, 03-28-2011 13:59:01  
I have a 6060 we had this problem 20 yrs ago. The vent under the cab floor had a check valve in it. When it gets hot the air expands, then when it cools down it puts a vacuum on the rear compartment pulling the oil from the front. I don't think my tractor has a seal between the compartments. I think oil goes through the bearings and seeks its own level. I haven't checked the trans in years. We knocked the check valve out and put a G1 fuel filter on the vent. Had almost forgot about it. If you want to call me tomorrow my no is 618 838 2225 Vic

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Longmeadow farm

03-30-2011 05:08:40

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 Re: AC 6080 question in reply to VicS, 03-29-2011 19:29:29  
Thanks for the tip, I'll check into it today..trying to locate the check valve, and give you a call... if I can't figure it out. Perhaps the valve was freed up during the dealer work and now it's stuck again. Sad to say it isn't inconsistent, with this particular AGCO dealer, to have replaced a seal when not necessary. Over the years they tried to replace a good hydraulic pump, turbo, etc... I usually get my orange work done by my green dealer.. not sure why I went back..stupid I guess. thanks again...

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cadet trooper

03-28-2011 17:50:16

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 Re: AC 6080 question in reply to Longmeadow farm, 03-28-2011 13:59:01  
I doubt if a previous post some time ago had anything to do with it but most owners were saying they had to keep their 6000 series tractor pto engaged all the time or risk pushing the crankshaft out the front of the engine obviously if there were that much pressure on the main shaft other components could face damage. Just a thought and I"m sure the dealer would have brought it to your attention.

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03-29-2011 19:32:04

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 Re: AC 6080 question in reply to cadet trooper, 03-28-2011 17:50:16  
There was a factory fix that put another bearing on the front of the crank. All tractors should have been fixed.

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Longmeadow farm

03-30-2011 05:18:15

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 Re: AC 6080 question in reply to VicS, 03-29-2011 19:32:04  
I have the external thrust bearing installed on my 6080. I had to re-shim and adjust the bearing clearance to place back in spec. The symptom was that the engine/traction clutch didn't release entirely and it was hard to get out of gear. Now it releases properly. I was as close as .005" to needing some main bearing work... or so the old AC external thrust bearing info said.

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04-05-2011 19:32:54

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 Re: AC 6080 question in reply to Longmeadow farm, 03-30-2011 05:18:15  
Good talking to you today, Vic Simpson

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