Posted by Hurst on January 03, 2010 at 15:59:31 from (67.141.19.197):
I was wondering if anyone has ever used this in a Power shift tractor to help with symptoms of sticking valves in the valve body. The tractor in quesiton is an Allis Chalmers 7000. It lags between shifts from 2nd to 3rd (it has the 3spd powershift) when warm. When cold, the thing shifts fine. It never slips, it just slams pretty hard and if you have the right load on the back, may pop the front wheels off the ground (I let off the throttle when I shift it any more so it doesn"t slam into gear). So, I don"t think it"s the powershift clutches of seals, as it still holds great pressure. I"ve put a pressure gauage on it before and when I shift it, the pressure just drops and comes right back up, but it just stays really low for a split second longer on the 2nd-3rd shift than the 1st 2nd. I am thinking it is a sticking modulator valve or possibly a worn mechnaism in the shifter not pushing the detent all the way into the gear. But before taking apart the valve body, I wanted to try this if it is safe. It has fluid and filter with less than 40 hours on it. Fresh change didn"t really help much. It also likes to kick the PTO out of gear when you shift the powershift when hot and nothing has been shifted for a while, because the PTO relies on constant hydraulic pressure to hold it engaged for safety reasons (so when tractor shuts off, PTO autimatically disengages).
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