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Re: Ford PTO clutch pack


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Posted by Paul in MN on May 22, 2009 at 17:17:23 from (71.210.144.244):

In Reply to: Ford PTO clutch pack posted by Kirk McDaniel on May 22, 2009 at 04:52:31:

On our bigger Fords, the Dual Power clutch pack, and the PTO engagement piston and PTO brake band piston are powered by a separate very small hydraulic pump which is piggy backed on the main hydraulic pump. I do not know if the 6600 is set up this way, but I suspect it is. That little hydraulic pump is a gear pump and is pressure reliefed at about 300 psi. When the engine is running, that pump is running. The body of that pump is a cast aluminum sandwich with hardened steel gears. Any grit which has gone through that pump will have scored the aluminum walls of the figure "8" opening the gears run in. So the pump is easily worn out and oil bypasses around the outside of the 2 gears losing pressure. My tractors have a brass tee with plug in the external steel line which goes forward to the Dual Power. You take the brass plug out and hook up a tranny pressure gauge with a hose on it, and make the pressure readings as described below. IIRC, these pressure checks can be done with the tractor tranny in Neutral and the parking brake engaged....engine running. Each slave piston has rubber "O" rings and it is possible one or more has failed, thus the loss of pressure in one function.

To the better experts, please correct any errors I may have made as it was about 15 years ago when I dealt with this issue on my Ford 9000.

Paul in MN


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