I've been reading these forums a lot since picking up a '66 4000 with SOS a month or so ago. It's in rather good shape, the only real issues are the dripping CAV injection pump, and inoperative PTO.
I have the rebuild kit for the CAV and it looks straightforward from the videos I've seen. It starts and runs great so not too pressing, I'll rebuild it when I get a chance.
The PTO issue is more pressing. It operates in the ground speed mode which of course is a completely different drive.
The T handle was missing and I found the pot metal housing for the handle had stripped out threads on the flare connection at the back so I fabricobbled a replacement assemble from stainless which is working well. The actual cable was fine so it's re-lubed and in use.
Testing with control handle out (ground speed selector off of course) and a brush hog sitting in light brush for some resistance there is no PTO movement. Lifted off the brush there is slow rotation which seems to indicate the PTO clutch is in reasonable shape.
The SOS transmission operates fine with or without the PTO handle out so it would seem there is no hydraulic issue or leak in the PTO side of things. There is also no detectable change in engine load either way.
If I move the ground speed selector to ON, the PTO handle movement stops / is blocked after about 1/4" of travel so that seems to prove the cable connection is working properly.
Looking at the manuals it would seem the sheet metal linkage between the incoming cable and the link down to the control valve would be the prime suspect and I read they have been known to get bent.
Thoughts on my diagnosis or anything I'm missing before I pull the cover to investigate further?
Thanks,
Pete
This post was edited by wp6529 on 10/23/2022 at 12:50 pm.
I have the rebuild kit for the CAV and it looks straightforward from the videos I've seen. It starts and runs great so not too pressing, I'll rebuild it when I get a chance.
The PTO issue is more pressing. It operates in the ground speed mode which of course is a completely different drive.
The T handle was missing and I found the pot metal housing for the handle had stripped out threads on the flare connection at the back so I fabricobbled a replacement assemble from stainless which is working well. The actual cable was fine so it's re-lubed and in use.
Testing with control handle out (ground speed selector off of course) and a brush hog sitting in light brush for some resistance there is no PTO movement. Lifted off the brush there is slow rotation which seems to indicate the PTO clutch is in reasonable shape.
The SOS transmission operates fine with or without the PTO handle out so it would seem there is no hydraulic issue or leak in the PTO side of things. There is also no detectable change in engine load either way.
If I move the ground speed selector to ON, the PTO handle movement stops / is blocked after about 1/4" of travel so that seems to prove the cable connection is working properly.
Looking at the manuals it would seem the sheet metal linkage between the incoming cable and the link down to the control valve would be the prime suspect and I read they have been known to get bent.
Thoughts on my diagnosis or anything I'm missing before I pull the cover to investigate further?
Thanks,
Pete
This post was edited by wp6529 on 10/23/2022 at 12:50 pm.