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N3PUY

C125 transmission locks-up.

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N3PUY

This winter while plowing my C125 stop like something in the transmission was binding.   It happened 3 times but otherwise worked just fine.  So today I thought I'ld better check it out.   

 

After removing the right case half I got to look inside.  A BOLT?    How did a bolt get in there?  

 

post-6866-0-73915800-1429396618_thumb.jp

 

post-6866-0-72749300-1429396625_thumb.jp

 

post-6866-0-85888400-1429396638_thumb.jp

 

All 4 bolts were in the diff.    Well,  3½ bolts!    One diff bolt is broken and the other 3 are loose.    And the diff housing is chipped.

 

post-6866-0-74474500-1429396910_thumb.jp

 

post-6866-0-46624500-1429396921_thumb.jp

 

post-6866-0-49235600-1429396930_thumb.jp

 

There is a little more damage done ... this gear has chipped teeth.   Might have been where the bolt got to it.

 

post-6866-0-02322400-1429397056_thumb.jp

 

And this long gear has 3 worn teeth!  Why?

 

post-6866-0-89784300-1429397131_thumb.jp

 

And how did this spacer loose a piece?

 

post-6866-0-21265000-1429397198_thumb.jp

 

Well, now it's time to hunt for a few parts.  A friend has a parts transmission that might help me out.

 

 

 

 

 

 

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rmaynard

Looks like a case for the transmission sleuths racinfool40 and stevasaurus.  :scratchead:

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stevasaurus

Yep, if you can not find parts...send a PM to Racinfool40 (Mike).  Looks like you are correct.  The bolt got caught under that small gear...that is your reverse idler.  The spline shaft is worn where the reverse idler engages it.  That washer is a "thrust washer"...very thin and probably is the victim of a chip from the bolt...it would have gotten caught under the large part of your 11 / 44 tooth gear.

 

When you go to put it back together...the reverse idler should have the bevel end facing up.  You want to change out those nuts on the differential bolts...nylon lock nuts.  I would replace that spline shaft, reverse idler, one differential housing, all the seals and that bearing under the mushroom gear, and any others that may look suspect.  Take a good look at all the gears.  :)  There are some guys that will advise you to put in hardened bolts in the differential...I don't like that idea...can you imagine the damage to your trans if one of those got loose in there???  :bow-blue:  Just my 2 cents.

 

Nice pictures...thanks...it makes it much easier to help you out with those.  :)

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scotty

Out of curiosity does the thrust washer do anything?

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stevasaurus

It rides on the bearing surface and keeps the big gear from riding on the housing that holds the bearing...really just a small spacer.  :)  I've seen trannys without them in there in that spot...could really be a spacing issue.

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scotty

Oh cool thanks for the info. Ive been wondering that for a while.

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