Re: T/A on 686 doesn't work

Posted by Owen Aaland on July 18, 2007 at 04:45:51 from (65.165.246.55):

In Reply to: T/A on 686 doesn't work posted by Mark in C.C. on July 17, 2007 at 18:34:40:

Hold the clutch down with TA lever forward. Start to move the TA lever back. You should feel a little free travel and then start to release the TA clutch. That is how it should normally feel. If this is not what you have, check the linkage adjustment. If the adjustment has not changed, but you have too mach free travel, have probably have a failed release bearing. A bearing failure will burn the fingers and will change the free travel.

If it still feels right, and the adjustment is OK, the problem is is inside the TA housing. You can take the stamped steel cover (four bolts) off the top of the housing to inspect the TA clutch. A pivot pin coming out of a lever will not change the free travel but the clutch will not release. With the main cltch pedal blocked down and the transmission in neutral you should be able to rotate the assembly in the direction if engine rotation to inpect it. With the TA lever back he TA clutch disk should have a few thousands of an inch clearance. The disk should be able to wiggle a little bit between the flywheel and pressure plate if it is released. If it is not free you have a TA clutch problem. If it is loose, but will not turn independent of the flywheel, then the problem is with the planetary gears.

Seized planetary gears will act the same as out of adjustment TA linkage when it comes to shifting.

A TA clutch problem can be repaired, depending on what is wrong, either through the inspection cover or by splitting the tractor at the main clutch. Planetary problems will require removal of the clutch housing from the tractor and a major TA rebuild.

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