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JD 455 pressure relief valve leaking!!

Weekend Freedom Machines » John Deere Lawn Tractor and Late Model Garden Tractor Forum » Late Model GT Technical Forum » JD 455 pressure relief valve leaking!! « Previous Next »

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George Liskey
Member
Username: Jdjake49
GA
Registered: 10-2005
Post Number: 873
Posted on Thursday, May 17, 2012 - 1:11 pm:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

Alex,

BAD NEWS!!

This is a quote from the TuffTorq website.

"Please note that we do not have parts distributors in the United States.
If you need a service center to repair your machine please contact
the dealer network for your brand of lawn equipment."

John Deere has a marketing agreement with TuffTorq that requires parts for a John Deere tractor can only be obtained from a John Deere dealer.
I once tried to order the parts from a Yanmar dealer and as soon as I mentioned it was for a JD tractor, he said he could not sell me the parts.

George of Buford
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TimS
Member
Username: Tsykes
MA
Registered: 9-2004
Post Number: 1684
Posted on Thursday, May 10, 2012 - 7:47 am:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

Terry, I'd like to nominate Alex's info (and this whole post) for the technical FAQ - very useful!

Tim
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alex riechmann
Member
Username: Jdaxle
IL
Registered: 3-2011
Post Number: 3
Posted on Wednesday, May 09, 2012 - 11:18 pm:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

i too, have a leaking valve at the top of the center section. mine is leaking at the seal where the pin sticks out. the seal # is ntn G5X9X2. google it and you wind up at a dead end in china. so i contacted tuff torq and they cant get the seal individually either but they can cross the valve to their number. AM882548=1A705024990 for $78.05 and AM882549=1A705024900 for $84.66. their web address is tufftorqparts.com. seems to be a little cheaper when its not in a jd box
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Burl B.
Member
Username: Green_in_ga
ga
Registered: 2-2012
Post Number: 3
Posted on Saturday, February 25, 2012 - 7:48 pm:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

Thanks for all the help George!!
I also can't remember the last time I had to push my tractor in the freewheeling mode, so I certainly understand your $2 solution. I mean, if I wanted a tractor to push I would have got a kubota or something...
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George Liskey
Member
Username: Jdjake49
GA
Registered: 10-2005
Post Number: 868
Posted on Friday, February 24, 2012 - 11:23 am:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

Burl,

I just went through this last week. My hydro had a couple leaks which I had to remove the hydro to fix. The reverse check valve was leaking. The forward and reverse valves are just a check valve not a pressure relief valve. The only time the valve can operate is when the lever on the side of the tractor is moved to the freewheeling position to move a tractor manually.(Push it)

There are two o rings on the outside of the valve cartridge which can be replaced. They prevent any internal leakage from the high pressure side to the bypass side. JD parts shows item # 12 CH11559 packing at the top of the valve stem. This is what usually leaks. The problem is there is no way that I can see to disassemble it.

The forward check valve has a part# AM882548 and the reverse is AM882549?? They are different!! I removed both check valves and then discovered this difference. I called JD parts and they did not have a clue which was which. After looking closely at them I noticed that one of them had a small orifice on the side and notches in the hex head on the top. Finally, I looked at TM1517 which stated that the reverse valve was the one with the orifice and MUST be used for the left side of the hydro. Jd parts refers to the valves as front and rear. The TM refers to them as forward and reverse.

The two check valves would cost over $600!! Since I have NEVER used the freewheeling option, I decided to fix the problem for $2. I throughly cleaned the ball valve and the entire assembly. I cleaned the top of the valves and put JB Weld around the stem. First I pulled the stem as far out as it would go and put an o ring on the stem just to hold it up for the glue to dry. After I installed the modified valves, I ran the tractor for 15 minutes and no leakage.

Works for me and my wallet,

George of Buford
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David Thewes
Member
Username: Jdmaninlouky
ky
Registered: 8-2010
Post Number: 855
Posted on Monday, February 20, 2012 - 4:18 pm:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

Brian -

You seem to be forgetting that when the engine is running , and there is operating fluid pressure on those valves ; they can , and will leak , given the opportunity .

Dave
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Brian Cronin
Member
Username: Wfburton159
ND
Registered: 1-2010
Post Number: 160
Posted on Monday, February 20, 2012 - 1:57 pm:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

Is your transaxle overfilled? It shouldn't leak from the top side unless there is too much fluid in it
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green in Ga
Member
Username: Green_in_ga
ga
Registered: 2-2012
Post Number: 2
Posted on Friday, February 17, 2012 - 10:21 am:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

I thought the same thing by looking at the breakdown of the internal parts/o-rings on that diagram too, Jerry. I can't seem to get the valve apart though.....even though the cap on the bottom of the valve "looks" like it comes off in the diagram??...maybe an internal thread on the cap???
Thanks for your help though, Jerry.
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Jerry M. Austin
Member
Username: Fly4fun
NC
Registered: 3-2006
Post Number: 441
Posted on Friday, February 17, 2012 - 10:08 am:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

Probably could just replace a few o rings and fix the problem. If I'm looking at the right part on the diagram on JD parts.

Jerry
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burl buchkowski
Member
Username: Green_in_ga
ga
Registered: 2-2012
Post Number: 1
Posted on Thursday, February 16, 2012 - 9:00 pm:   Edit Post Delete Post View Post/Check IP    Move Post (Moderator/Admin Only)

Hi guys,

Long time follower, first time post-er. Lets get right down to business. I have a leaking pressure relief valve on top of my transaxle on my JD 455.

Does anyone know if I can rebuild it, or do I have to get a new one from JD ($279.00...yikes)

Thanks!!

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