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AC6080MAINE 
Silver Level
Joined: 22 Nov 2016
Location: Maine
Points: 60
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 Topic: 6080 engine RPM steady but gauge bouncing
Posted: 04 Jul 2017 at 10:21am |
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Tractor is running great but the gauge is acting up. It will bounce about 700 rpm. If I have the gauge bouncing from 500 rpm up to 1200, it sounds like it is at 1200, not in between. It's bouncing pretty hard, 4-5 times per second. Is this a an rpm gear or cable slipping?
We rescued the tractor from a retired farm where the owner passed away, and haying this week is probably the first time the tractor had a good load on in 10 years.
Thanks for the help and happy 4th of July, all.
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Orange4ever
Silver Level
Joined: 01 Sep 2014
Location: Farmington, MO
Points: 390
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Posted: 04 Jul 2017 at 11:19am |
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RPM gauge is electronic you probably have a loose wire on the alternator . ground is also possible alternator to be going out but lots of times it's just the wire going into the alternator into the side there's three of them together
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If you want a man to be a successful farmer, give him a Allis Chalmers tractor. If you want him to be a successful mechanic, give him a John Deere
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bradley6874
Orange Level
Joined: 05 Sep 2010
Location: salisbury md
Points: 1349
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Posted: 04 Jul 2017 at 6:27pm |
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Loose belt will make the tack jump
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You can wash the dirt off the body but you can’t wash the farmer out of the heart and soul
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AC6080MAINE
Silver Level
Joined: 22 Nov 2016
Location: Maine
Points: 60
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Posted: 04 Jul 2017 at 10:20pm |
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Thanks guys I will check both out. When I find the answer I'll report back!
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WNYBill
Silver Level
Joined: 04 Jun 2016
Location: WNY
Points: 276
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Posted: 05 Jul 2017 at 8:46am |
Please tell us what you find....... my 6060 does the same thing. Bounces, sometime goes to zero and than will operate properly. Mine acts like a loose wire. Afraid to tear into the insterment panel........ and the Service Manual doesn't have much information. Mine has room for 2 fan belts but only has one, it seems to be tight. I'll check the alternator wires.
Bill
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DougG
Orange Level
Joined: 20 Sep 2009
Location: Mo
Points: 8247
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Posted: 05 Jul 2017 at 9:35am |
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The 3 prong hookup on the Alt. is usually the place for a bad connection, take the side panel off on the right side up by the dash, that will get you access to the tach,ive worked on a few of these , sometimes you get lucky with a wire ,loose belt, but they are 30+ years old and anything electrical exposed to outside conditions do give out
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AC6080MAINE
Silver Level
Joined: 22 Nov 2016
Location: Maine
Points: 60
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Posted: 08 Jun 2018 at 12:41pm |
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Whoops, better late than never. The alternator ended up smoking out on me so I replaced it and it also solved the bouncing tach issue.
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 5129
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Posted: 08 Jun 2018 at 9:46pm |
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Dads 6060 would not go above 1,000 rpm this week. Checked the connector, cleaned, and then realized the alternator belt was so loose! Tightened it up and it resolved the issue. We had replaced both clutches and forgot to tighten the alternator back up. What a relief.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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