tranny swap

57jd420 · Post by **57jd420** » Fri Dec 14, 2012 7:40 pm

i have a 420c and have a couple badly worn gears.. we are having trouble find replacements. i know where there is a 40c trans thats complete for a decent price about 5 min from my house. would the 40c tranny work with my reverser???

Post by **Lavoy** » Sat Dec 15, 2012 10:13 am

I'm tearing down another tranny this morning, keep your fingers crossed.
Lavoy

57jd420 · Post by **57jd420** » Sat Dec 15, 2012 10:24 am

okay sounds good. so how worn is too worn?? heading out to the shop here in a little bit, i will take some pics and try to get them posted.

Post by **Lavoy** » Sat Dec 15, 2012 4:03 pm

If badly pitted, worn tapered, or chips out of the gears is the primary things to look for.
Lavoy

57jd420 · Post by **57jd420** » Sat Dec 15, 2012 5:05 pm

all the gears we were concerned with are worn tapered. for the time being we are going to put them back in so we can get the dozer reassembled, want to fire the motor and get the timing set and some other things. and if we can find the gears we will just put them at a later time. it should run for awhile with the old gears.

Post by **Lavoy** » Sat Dec 15, 2012 6:22 pm

900 gears later, I found them, PM sent.
Lavoy

57jd420 · Post by **57jd420** » Sun Dec 16, 2012 1:58 pm

[i

mg]

Heres some photos of the gears that are worn. [/img]

Post by **Lavoy** » Sun Dec 16, 2012 2:34 pm

Seen and had more than a few like that. Not sure if it is all attributed to bad bearings, or if sometimes it is the operator not getting the gears shifted all the way in.
Lavoy

57jd420 · Post by **57jd420** » Sun Dec 16, 2012 2:37 pm

by looking at them it seemed to me at first glance this would be from improper shifting. bearings are all in good shape.

jtrichard · Post by **jtrichard** » Sun Dec 16, 2012 5:02 pm

could have been bad bearing from long ago ...i would check out shift fork,,shift rail,,and detent hole in rail,, detent ball and spring also ......and as the saying goes if you cant find em ,,grind em

57jd420 · Post by **57jd420** » Sun Dec 16, 2012 5:07 pm

only thing worn is the gears shown, everything else looks almost brand new.

mapaduke@yahoo.com · Post by **mapaduke@yahoo.com** » Mon Dec 17, 2012 6:30 pm

I find that trans gears are a lot better in rubber tire tractors than crawlers. I picked up an M for parts for my MC and the gears and spline on the input shaft were like new .

57jd420 · Post by **57jd420** » Mon Dec 17, 2012 6:55 pm

hmm.... good to know i will have to keep that in mind. i'm always seeing tractors being parted out.

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