|Captain said: (quoted from post at 01:49:51 08/06/12) Can anyone help with this problem with a Case 1070 - PTO running stationary and then gearbox drops into gear and starts to reverse the tractor - have checked linkages etc but not sure why it is doing it.|
Captain, If you have a powershift tractor the shift spool should not be able to get into reverse without the clutch spool being released. If the reverse lockout is working properly it is in a notch in the shift spool and keeps it ( the RL spool)from moving out of position until the lube pressure drops behind it and it withdraws so the spool can move (when the clutch pedal is pushed).
If the tractor is working ok otherwise, I would check the lube pressure on the powershift valve to assure it is at or near 75 lbs with the clutch engaged, dropping to zero with the clutch pushed, and if so I suspect that someone has the shift spool 1/2 turn out of position, there are lockout notches on one side only.
Try to see if you can pull it into reverse without clutching, engine running of course, if you can then the RL spool is not engaging. A remote possibility I suppose would be a cable adjustment that isn't allowing the spool to move far enough to allow the reverse lockout spool to drop into position. A more remote one than that would be a problem with the RL spool itself. If all else checks out, remove the bolt that holds the shift fork, slide it off the pin, turn the spool 1/2 turn and reistall and try it.
The pin on the spool should have a retainer on the end of the pin that goes up if it hasn't been removed and put back wrong. This post was edited by mEl at 04:28:05 08/06/12.