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John Deere Tractors Discussion Forum
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JD 420W Rockshaft

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Ken Acton

11-09-2004 18:38:01




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Anyone out there who has replaced large seal part nr AM3433T? I have tried to replace with the seal bought at JD dealer and the seal is to large to fit into the housing of the rockshaft. The dealer is in the process of researching with John Deere ref defective or incorrect seal. The outer race of the seal is not flat as it should be. Any comments or suggestions?




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Henry J

11-10-2004 06:40:33




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 Re: JD 420W Rockshaft in reply to Ken Acton, 11-09-2004 18:38:01  
Ken

Your year and sn would help here, But this is my version of what is happening. I crossed out the AM3433T number in my book and it is for a HiCrop/Tricycle/Special

The number for the W is AM3432T. However that is for the tom's that have the late model rock shaft housing - the ones with the bushings in them. If you got the old housing without the bushings the number should be M2107T - assuming that that is the seal you are wanting since if you have a dual tom there are more seals. That number may cross over to another one when the parts man looks it up.

We could start another long winded discussion on when the housings changed, but I am convinced that they started going on the 420 in late 58. Anyhow to settle the deal, if you have had the rock shaft/shafts out it will be easy to determine if it has bushings or not. Also somewhere on the housing will be a part number (I think under the left side, If it is T12735T you have the new type rockshaft housing with bushings. If it is something else you will probably need the seals as listed in the manual for the housing up to sn 158437.

Also, you porbably already are up on this but if you have the dual tom, there is a seal also inside the short shaft that seals the oil from running between the hollow shaft and the main shaft.

Hope this gets your parts man headed in the right direction, but confirm what type of housing you have also to get it the first time.

Good Luck

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Henry J

11-09-2004 20:13:14




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 Re: JD 420W Rockshaft in reply to Ken Acton, 11-09-2004 18:38:01  
Ken

What year and sn of 420 you working on?

Does the rock shaft have have bushings in it? This would probably be in late 58 or a tom that has had an updated rock shaft housing installed.

I just put the seals in a dual tom for a late 58 420 that I got from deere and they fit like they should.

I will look up your pn tomorrow, but shout back on what your are working on in the mean time.



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Ken Acton

11-13-2004 16:04:15




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 Re: JD 420W Rockshaft in reply to Henry J, 11-09-2004 20:13:14  
Thanks Henry J, I just got your message today. IMy 420 is sn 107763 1956. Your info is the best I have received. I only have the right side leaking so I am trying to replace the seals without removing the rockshaft. You obviousloy know more than my JD deal parts folks know. I'm going to take your e-mail to them and mayber they can get it right.



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buickanddeere

11-09-2004 19:23:56




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 Re: JD 420W Rockshaft in reply to Ken Acton, 11-09-2004 18:38:01  
The rockshaft on late the 330,430,435 at serial # 437649 and 440 were updated to using a bushing. Instead of rubbing the shaft on the cast housing. Just a matter of machining a space for the bushing and pressing it in. The late seals # AM3432T/AM3433 were used instead of M2107T/M2108T. If the housing/shaft is ruined, every new seal installed will leak.



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