control valve seal kit

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Bobby H.
430 crawler
430 crawler
Posts: 64
Joined: Mon Dec 15, 2014 9:53 am
Location: AUSTIN, TEXAS

control valve seal kit

Post by Bobby H. » Tue May 26, 2026 8:16 am

anyone have a idea where I can find a seal kit and or replacement valves for my 450c. Seal kit # is AU40434 or the valve assembly AT43378. Not finding these numbers anywhere online. It's not an emergency just some seepage I wanted to stop.

Jim B
350 crawler
350 crawler
Posts: 2546
Joined: Sun Nov 05, 2017 11:36 am
Location: western Maine

Re: control valve seal kit

Post by Jim B » Tue May 26, 2026 10:47 am

It looks like the AU40434 kit is available from John Deere. It also looks like it will only do one valve section. The other thing it to use the part catalog and figure out which parts you need and order them individually.

I did get some hits with an online search using the AU40434 part number. One would need to do some emailing or phone calling to see what is actually available.

Bobby H.
430 crawler
430 crawler
Posts: 64
Joined: Mon Dec 15, 2014 9:53 am
Location: AUSTIN, TEXAS

Re: control valve seal kit

Post by Bobby H. » Tue May 26, 2026 6:24 pm

I checked with RDO Equipment but they said NA. I check with JD and see if they have Thanks Jim. She is finally up and running but has a slight seep. one gallon per year or two kind of seep. not Real concerned but would like it right. :shock: :D

Jim B
350 crawler
350 crawler
Posts: 2546
Joined: Sun Nov 05, 2017 11:36 am
Location: western Maine

Re: control valve seal kit

Post by Jim B » Wed May 27, 2026 4:41 am

RDO is a JD dealer they should know. Did you ask them to do a system search? I have seen JD show things in a manner that would indicate they were available and sometimes they are not.

You may need to order what you need as individual pieces. Having to do that is a common thing when kits are no longer available.

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