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John Deere 420W rockshaft

2

2 Fingers

Member
The rockshaft on the 1958 John Deere 420W I recently acquired leaked severely so I did the research and found out about the wear issues they had before John Deere upgraded the 430's and 435's to bronze bushings and lip seals. I decided to make the upgrade myself and had the rockshaft housing bored out. I machined the bushings and rebuilt the worn shaft myself. I installed the large lip seal (AM3433T) and two smaller lip seals (AT13262T). After I got it reassembled and installed on the tractor I filled it with oil. The next day it was leaking onto the floor. I investigated and found that the AT13262 lip seals on each end of the 2" solid shaft were leaking oil. The larger AM3433T lip seal seems to be fine and working correctly.
Does anybody have any thoughts as to where I went wrong?
 
I see there is a serial number break, did they give you the right ones?? Only worked on a 430, and replaced those seals also.
 
My serial # is 1318xx so I think I'm before the serial number break your talking about. Somewhere in one of the forums I read they talked about other part numbers for seals and for the life of me, I can't find them now. Are there other options for lip seals in this application. I checked the specs of the seals versus the shaft before assembly and everything looked like it should fit tight and seal. I didn't specify in the original posting but my tractor has DTOM.






















l
 
The rubber on the seals are tapered in toward the oil, the same way I've always put them in. Generally speaking there's a spring that holds tension on the rubber lip and all of that faces inward. Is that correct?
 
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