Posted by JDEM on March 21, 2020 at 08:49:16 from (47.33.231.52):
Is there anyone here who fully understands how the optional live PTO works in the Ford NAA/Jubilee? Better yet, has anyone ever had one fully apart? I have the Ford (Dearborn) manual for it. It does not show internal parts. It seems small parts were never available so Ford did not show them in the service manual.
Long story-short. I bought this tractor based on my incorrect assumption is was all gear-drive. When the clutch slipped every time I started the tractor I assumed something HAD to be wrong. I split it and put a new flywheel-clutch into it even though the old one looked fine.
Now I find out that Ford states it is supposed to slip when started cold. I am still kind of amazed that with all the tractors I have worked on in the past 50 years, I had never heard of the Dearborn model 23-12 Live PTO kit before.
When I was working on the tractor, I was at first wondering why Ford put such an elaborate gear-box on the end of the main hydraulic pump just to run the cable for the proof-meter and tach. I now realize it is a tiny hydraulic pump that powers the live PTO package.
What I still do not understand. Ford says that when the tractor is turned off, the hydraulic clutch goes into a "lock-up" mode. I do not understand how this happens? There is a clutch pack, a hydraulic pump, and a control valve that turns it "off" or "on." So when there is hydraulic pressure, the clutch disks engage and engine power gets to the rear differential. When the control valve is turned "off" and no hydraulic pressure gets to the clutches, there is no power to the rear wheels. So far, easy to comprehend. But when the engine is turned "off" and there the hydraulic pump is doing nothing, the PTO assembly somehow goes into a lock-up mode? This is the part I do not understand. What is locking up?
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