Ford 8000 Dual Power PTO Issue

[forthga]

I have a 1972 Ford 8000 Dual Power with a PTO issue. When the hydraulic oil is cool PTO will work normal. After reaching operating temperature I have to accelerate the engine engine to get the PTO to activate, conversely with no load on the PTO it will keep rotating, that is unless the oil is not up to operating temperature it will then stop.

At operating temperature I have about 100 psi in the test port, normal is 135 to 165 psi.I am guessing there is an O-ring leaking in the actuator valve on the clutch assembly, since I have an issue with both starting and stopping the PTO at operating temperature. Does this sound reasonable, and can the PTO clutch assembly be removed through the hole after the hydraulic pump cover plate is removed from the right side?

 

[Sean in PA]

That cover plate is the body of the hydraulic pump, so it cannot be removed without removing the pump itself, which is good because if it was a separate cover and you removed it, the pump would still be in the way. I've never worked on that model, so I can't say for sure whether the PTO clutch assembly can be removed through that hole though. Hopefully someone else will come along that knows for sure.

 

[forthga]

That cover plate is the body of the hydraulic pump, so it cannot be removed without removing the pump itself, which is good because if it was a separate cover and you removed it, the pump would still be in the way. I've never worked on that model, so I can't say for sure whether the PTO clutch assembly can be removed through that hole though. Hopefully someone else will come along that knows for sure.

The repair manual is a little unclear to me, but it appears for the 8000 the PTO clutch assembly can be removed from that hole. I would just like to confirm from someone that knows for sure. I am wondering if the O-rings in the clutch pack and valve assembly are going bad and that is why the oil pressure is lower after it warms up. Again, I would just like confirmation from somebody that has experience with the 8000 before I tear into it.

 

[Old Ford Mechanic]

BTDT several times. I removed the PTO clutch pack from the pump hole the first time. NEVER AGAIN! It can be done but, you would need to move the rear tire and wheel out for clearance to remove the pump manifold. The control linkage for the remote valves would need to be removed as they are mounted on top of that manifold among other things. After that first time and all the time spent i, have just gone ahead and split the tractors between the rear and transmission. That way you can see what you are doing and get to everything much better. You have described the classic failure of the PTO clutch pack. You will find that all the seals and clutch plates in the drum will need replacing. The PTO brake will need serviced also with new parts. All new parts follow the directions in the service manual and your PTO will work again. New hydraulic oil and filter should also be part of the repair. Those linings from the worn out clutch plates are in the oil and filter.

 

[forthga]

BTDT several times. I removed the PTO clutch pack from the pump hole the first time. NEVER AGAIN! It can be done but, you would need to move the rear tire and wheel out for clearance to remove the pump manifold. The control linkage for the remote valves would need to be removed as they are mounted on top of that manifold among other things. After that first time and all the time spent i, have just gone ahead and split the tractors between the rear and transmission. That way you can see what you are doing and get to everything much better. You have described the classic failure of the PTO clutch pack. You will find that all the seals and clutch plates in the drum will need replacing. The PTO brake will need serviced also with new parts. All new parts follow the directions in the service manual and your PTO will work again. New hydraulic oil and filter should also be part of the repair. Those linings from the worn out clutch plates are in the oil and filter.

Thanks for sharing your experience and knowledge, that is helpful. I was hoping to not have to split the tractor, but based on what you state it appears that’s what I should do. I did plan to rebuild the whole clutch pack while I had it removed.

 

[forthga]

BTDT several times. I removed the PTO clutch pack from the pump hole the first time. NEVER AGAIN! It can be done but, you would need to move the rear tire and wheel out for clearance to remove the pump manifold. The control linkage for the remote valves would need to be removed as they are mounted on top of that manifold among other things. After that first time and all the time spent i, have just gone ahead and split the tractors between the rear and transmission. That way you can see what you are doing and get to everything much better. You have described the classic failure of the PTO clutch pack. You will find that all the seals and clutch plates in the drum will need replacing. The PTO brake will need serviced also with new parts. All new parts follow the directions in the service manual and your PTO will work again. New hydraulic oil and filter should also be part of the repair. Those linings from the worn out clutch plates are in the oil and filter.

Is there anything I need to be aware of with the Dual Power valve? It is operating well. But since it has to be removed, I am guessing I need to disassemble to check for wear.

 

[Old Ford Mechanic]

If the dual power is working correctly then, i would not tinker with anything.