Posted by Owen Aaland on June 01, 2011 at 08:02:59 from (216.47.32.42):
In Reply to: Farmall 1206 TA posted by mkirsch on May 30, 2011 at 16:58:10:
Quoting Removed, click Modern View to see
You are on the right track but the 86 series tractors are the first to use a cable to shift the TA. All the older ones are controlled by rods and levers. On the TA shift lever you just need to make sure that the spool valve in the top of the MCV goes down to touch the snap ring when in the forward, TA, position. It should start to move up as soon as you start to pull the lever back to the high position.
It the tractor was working fine before the most likely cause of a failure that occurs after a period of disuse if the dump valve sticking in the open position. When the clutch is pushed in the dump valve is pulled to the rear to dump the oil pressure from the TA clutch packs to allow the tractor to shift easier. If it sticks back it will continue to dump the TA oil pressure when the clutch is released and you will be left with only the low side sprag clutch pulling. The tractor will also free wheel going forward down hill.
The rear axle bearing are not terribly difficult to replace but you will need heavy enough equipment to handle the rear wheel and then the axle housing. The inner bearing outer race can be removed from the rear frame by welding a bead on the inside to shrink it. The bearing cone is a press fit on the axle shaft and requires a large gear puller to remove it along with the bull gear. If you are good with a torch you can also cut the bearing from the axle. Once the bearings are replace the bearing preload will have to be reset by using the proper shim pack under the outer bearing cap.
On a 1206 if the rear frame has not had holes drilled through from the axle reservoir to the transmission/differential area, now would be a good time to do it. That allows the axle housing to become a common reservoir with the rest of the drive train and eliminates the problem of the axle bearing either running out of oil or over filling from a bad seal on the bull pinion shaft. If the housing is drilled you can also remove the expansion plug behind the inner axle bearing cup. Tractors with drilled housings should also have the square part of the fill/check plug sawed off on the axle housing to indicate that the update has been preformed and checking/filling the axle housing is no longer necessary.
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