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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

550 - Throttle lever pulls back to idle when I release

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David Lee Hawki

10-11-2007 19:25:12

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I just had the PTO clutch repaired in my Oliver 550. Now, when I start the tractor, the throttle will not stay as set. No matter where I move the lever to, it automatically moves back to idle as if there were a spring pushing it back. It wasn't doing this before the split.

Also, when I pull the PTO lever back, I should feel some kind of locking action, right? As it is after the repair, the lever never really locks. Within a few seconds, the PTO lever moves forward and the PTO shaft stops rotating. I am pulling back hard, much harder than the 28lbs required and much harder than I used to pull. Is the locking tension set too high? The mechanic doing the repair is not available for a few days. Thought I would ask more experienced tractor owners.

Any thoughts?

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SW3

10-13-2007 06:59:26

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Re: 550 - Throttle lever pulls back to idle when I release in reply to David Lee Hawkins, 10-11-2007 19:25:12

Oh, on the throttle lever. Mine did the same thing, my friction disc assembly was all greasy. Take it apart and clean it up. They should be clean and dry. It is on the left side of the tractor about the height of your knee. I think there are two metal plates, and two friction discs sandwiched togeter. Then there is a sping and nust on the bottom which provides the pressure. Tighten the nut for more pressure. Good Luck

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SW3

10-13-2007 06:53:57

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Re: 550 - Throttle lever pulls back to idle when I release in reply to David Lee Hawkins, 10-11-2007 19:25:12

On the PTO lever, as per my manual -1973 Oliver 550. To adjust the clutch, stop engine, release pto lever (push it forward) Remove hand hole cover from under the tractor. The hand hole cover is about in the center of the tractor held in place by four small bolts. Reach through the hand hole and rotate the pto clutch assembly until the adjusting ring lock pin is on the bottom of the assembly. With a screwdriver tip, depress the locking pin and rotate the adjusting ring to the next notch. Clockwise to increase, counterclockwise to decrease clutch engagement pressure. Very easy to do, it may take a few notches to get it adjusted correctly. Good Luck.

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Chris Van der Vyver

10-12-2007 07:02:18

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Re: 550 - Throttle lever pulls back to idle when I release in reply to David Lee Hawkins, 10-11-2007 19:25:12

On the throttle. It is possible for the governor control (= throttle) link at the bottom of the governor control rod (or the bend in the rod itself) to get caught in the choke cable (or even in the lighting wires by the fuse box).
That might cause it to spring back, but also there should be enough friction on the discs to hold it wherever you set it. See if there is enough tension on them - or too much - by adjusting the nuts underneath the friction disc assembly.

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1755

10-13-2007 20:16:12

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Re: 550 - Throttle lever pulls back to idle when I release in reply to Chris Van der Vyver, 10-12-2007 07:02:18

I took the Calf scales and set the 550 when we got it back it was not set tite enough and sliped on the brush hog it was alot harder than I thought to snap it over but I was thinking it was 40 pounds not 28 it said in the book witch is out at the farm but you just get under there and ajust it like they said but I couldent get my hand in there may want to take a screwdriver with you a large one to turn it over and a small one to push the lock over

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1755

10-13-2007 20:13:00

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Re: 550 - Throttle lever pulls back to idle when I release in reply to Chris Van der Vyver, 10-12-2007 07:02:18

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