[Green_in_ga]

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!!

 

[fly4fun]

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

 

[Green_in_ga]

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.

 

[wfburton159]

Is your transaxle overfilled? It shouldn't leak from the top side unless there is too much fluid in it

 

[jdmaninlouky]

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

 

[jdjake49]

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

 

[Green_in_ga]

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...

 

[jdaxle]

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

 

[flymo]

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

Tim

 

[jdjake49]

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

 

[johnny72]

I think i found one but need some pics without the front yellow canvas to determine if it is the correct one. Also how do you look the cabs up on jdparts? I have found the one for the 300 series but not the 200's. TIA