I hesitate to suggest it.... If leakage is past old worn, shrunk and hardened seals and gaskets around the high/low, PTO clutch and PTO brake.
Before tearing it all apart, maybe a dose of that Lucas seal swelling snake oil maybe worth a try ?
Don't intended to hijack your thread. A minor version of your challenges going on here too.
The hydraulic independent PTO control valve on my 1640 has been seeping oil and rust proofing the center section of the tractor.
The low transmission oil pressure light came on so I replaced the gasket R234266 .
However I had a stunned moment and realized that I did not order two of the fat little O'rings L36237 at the same time. They were on a different parts diagram and did not double check all the info as should have been done.
Will have to take the PTO control valve off again today and replace the O'rings . They were so shrunken and so hard. Have to wonder if the wrong oil had been poured into that tractor at one time ? The rockshaft piston rings are also seeping , so there is a pattern there.
The O'rings also blew out of the power steering a few years ago and rust proofed the back half of the tractor and myself. They too appeared damaged.
There may have been some GL-5 gear lube dumped in there decades ago. Flushed the system twice since purchasing however the damage is done.
Will double check the transmission low pressure switch too for leakage. It is in a nearly inaccessible location unless the entire top is lifted off the transmission.
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