Re: What does it really mean when a TA slips

Posted by Carp on January 31, 2005 at 09:36:55 from (12.27.55.243):

In Reply to: What does it really mean when a TA slips posted by Brianbws on January 31, 2005 at 08:15:44:

The T/A will not "Slip" in low range. It either works or it does not. The commom problem with a T/A is that the over running cluth (ramp and roller or sprags depending on which type it is) does not engage when you pull the lever back into low range. When this happens, the planet gears are not held stationary around the sun gears and the carrier counter rotates around the sun gears instead of driving the output sun gear. When the T/A is in low range, the friction clutch is actually disengaged.

On the high side (direct drive) the friction clutch is engaged. This drives the carrier and the planet gears at the same speed as the input sun gear, which in turn drives the output sun gear at the same speed (hense direct drive.)

If the low side of the t/a is out, but the high side holds and works fine you can use the t/a without any fear of the t/a further damaging itself. The only case this would not be true is if there is gear damage on the sun or planet gears.

If the t/a just makes a whirrrring sound (similar to a clutch slipping) then it should be ok. If you hear nasty gear noises, that probably means that the sun and planet gears are damaged as well. In that case you will most likely loose drive in high and low range eventually and have to replace the entire t/a.

Sorry for the long post and hope it helps.

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