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Ford Tractors Discussion Board

ford 7710 pto/dual-power problems

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Posted by skyp harmon on May 26, 2009 at 19:15:36 from (

Hey Bern or Rod help !! I recently purchased a 1985 model 7710 with cab got it home and found the dual power was sliping put it in the shop and disconected the line that feeds the dual power and instaled gage found only 35-psi coming from the pump. I drained the oil and removed the pump found the line that feeds the pto control valve had a broken clip and had come unseated from the control valve. I ordered new updated 2 piece line and instaled it and reinstalled the pump, filled with oil and retested it. I found the following tractor ideling at 850-rpm pto disengaged d/p in turtle pressure 215-psi with needle fluctuating. pto engaged d/p in turtle 160-psi, pto engaged d/p in rabit 130-psi,pto disengaged d/p in rabit 150-psi.All presures came up alot with in rpm. It didn't seem right, but thought I would give it a try. Test drove it on the road in hi gear, shifted d/p up and down on some grades it seemed ok.A few weeks later had some mowing to do, hooked up my 15-ft batwing and headed out all was well for about 2hr I throtteled back to slip between two trees when I throtteled back up the pto didn't. Took it back to the shop and put the gage back on it, found a significant drop between pto on and off. I did the rear split removed the cluch and valve, found lots of damage, thrust washer broken, bushings gone from cluch housing valve support groved, one of the three sealing rings missing and that the valve had been messed with and the releaf valve shimed with a ball bearing! decided to put all new parts back in. I bought a factory assembled clutch, thrust washer, sealing rings, valve support housing,and valve. I installed all, removed the pump so I could watch and make sure I didn't mess anything up, reasembled the tractor filled it back up and put the gage back on. 850-rpms 135-lbs pto in or out d/p in turtle 120 d/p in rabbit, test drove, d/p will break loose in high gear on a hill, haven't tryed the pto. I disconnected the line to the d/p and pluged it. Rechecked the pressure, still 135-psi pto in or out. Checked the screen on the pump and it was clean. I think I need to add shims to the releaf valve. you think N-H would set that valve at the factory! Is there a way to get valve out without respliting the tractor? Also how many shims would you add? P.S. this is a cab tractor so geting the hyd. unit off is no small task either. How about through the pump hole or the round cover on the other side? Thanks, Skyp Harmon


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