6080 acting weird?
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=130242
Printed Date: 24 Oct 2025 at 5:55am
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Topic: 6080 acting weird?
Posted By: lowell66dart
Subject: 6080 acting weird?
Date Posted: 20 Oct 2016 at 7:25am
Yesterday I was using my 6080 to bushhog soybeans that I had planted for a cover crop. I was running about 1500 rpm in second gear really taking my time. About an hour in to the job the tractor rpm increased to 2100 rpm. I throttled back and that did nothing. Turned the key off and again nothing. I downshiffted to first and that dropped the rpm a little. I was thinking of a way to stall it out when all of a sudden the rpms dropped to idle where I had the throttle set. Raised it back to 1500 and used it for another half an hour with no issues. This whole deal lasted around 30 seconds. Any one have any idea what may have caused this?
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AC 6080 (8030,7060,200,175,D-17HC, 6040,160,6140 all gone) Farmall 1066 & 656 Hi-Clear (for sale), White 2-62 High Clearance, JD 4255 Hi Clear.
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Replies:
Posted By: DrAllis
Date Posted: 20 Oct 2016 at 7:43am
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Sounds like a sticky metering valve inside the injection pump. Bad fuel?? Might be time for a pump OHaul.
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Posted By: lowell66dart
Date Posted: 20 Oct 2016 at 8:13am
That was my guess, something pump related. I have been using on road diesel. What about some off road diesel for a little more sulfur and some Stanadyne?
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AC 6080 (8030,7060,200,175,D-17HC, 6040,160,6140 all gone) Farmall 1066 & 656 Hi-Clear (for sale), White 2-62 High Clearance, JD 4255 Hi Clear.
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Posted By: DrAllis
Date Posted: 20 Oct 2016 at 10:43am
Posted By: injpumpEd
Date Posted: 20 Oct 2016 at 11:12am
on road, and off road fuel is same, just different color. Adding Stanadyne additive might help, but if the flex ring is breaking apart, it'll have to be serviced soon. A big piece may have got in the way of proper metering valve operation. I've seen this before.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: lowell66dart
Date Posted: 20 Oct 2016 at 1:59pm
Ok. I'll watch it. If it does it again I'll have to do something. I was thinking that I had maybe run into natural gas leaking out of the ground and I was suddenly rich!!!! That's if I didn't blow up.....
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AC 6080 (8030,7060,200,175,D-17HC, 6040,160,6140 all gone) Farmall 1066 & 656 Hi-Clear (for sale), White 2-62 High Clearance, JD 4255 Hi Clear.
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