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420C Will not move?

S

shawnm

Member
I picked up this little dozer to do some yard work around the old farm. Everything runs great and it appears that the steering clutches worked well while we towed the machine.

I can't get any power to the trans so I am assuming there is an issue with the coupler or possibly the clutch could be frozen? There isn't any noise at all which makes me suspicious.

What is the best way to split the machine to check the shaft, at the transmission\torque tube or engine\bell housing?

Here are some pics.

IMG_1235.jpg


IMG_1234.jpg


IMG_1233.jpg
 
Take the top cover off of the trans first to make sure power is or is not getting to the input shaft.
Splitting at the engine might tell you if it is the coupling, but will not allow access to repair in all likelyhood, might have to split at trans too.
That being said, that vintage of 420 was not prone to coupling failure, it might be something in the engine clutch.
Lavoy
JDCRAWLERS.COM
 

A bit of good luck happened while the crawler was on the trailer. I'm guessing the clutch was stuck and the rough ride home loosened it up. I was able to drive the 420 around the yard. Could only turn left, but I'd rather rebuild the right drive clutch versus a split.
 
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