Posted by Owen Aaland on May 26, 2011 at 17:31:52 from (216.47.32.42):
In Reply to: 1086 pto posted by Roger Shively on May 26, 2011 at 16:14:52:
Is the PTO the only thing that quit? If you also lost power steering and brakes the failure is the PTO drive hub in the main clutch. Facing down hill with a low transmission oil level can also allow the PTO to draw air into the PTO pump and cause the clutch pack to release. If those things are OK the problem is in the PTO assembly or the control linkage. If the linkage is still connected does it still fell the same when engaging?
There is a small pin in the PTO control valve stem that can break. When that happens the stem will pull up with less effort than before. Will the PTO shaft spin with nothing attached to it? If not there is a good possibility that this pin broke.
Another possibility is that the clutch pack is worn out. There is a snap ring that restricts the total travel of the piston. When enough wear occurs so that the piston contacts the snap ring there will be less compression of the clutch pack even though the hydraulic engagement pressure remains the same. At this point a couple of seconds of slippage under load will be enough to destroy what is left of the clutch pack. In this case the PTO will usually still turn if engaged with nothing attached to it.
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