Posted by wnettles on September 24, 2017 at 14:56:49 from (73.53.134.17):
I have a 1947 John Deere M tractor (my grandfather's) and the rockshaft will not move when I pull up on the Touch O Matic control lever. It worked for the last 70 years or so, but, now it will not lift.
Plenty of oil in the sump, good pressure out of the pump, but, no lift. Took the front case cover off of the control valve housing and inspected all the linkages for a missing pin, but, everything is in place.
Manually worked to rockshaft arms up and down and the control valve is getting the mechanical feedback signal via the rod from the rockshaft. What could be the problem and where to look next?
Never had to take one of these apart..... Guess there is first time for everything. Any suggestions or tribal knowledge would be much appreciated.
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