TC40D hydro creeping foward

[sigjig]

I recentley bought a 2005 TC40D. I have a problem with the tractor wanting to move foward after releasing the pedal. I've read some of the previous posts about this problem and have done everything that was recommended. The roller is dead center in between the two cams. The linkage and fittings have all been lubricated. I don't know where to turn next. Any information will be appreciated. Thanks Sig

 

[jinman]

Sigjig, welcome to TBN and the NH forum. I hope you come back often to visit and to post. I'm sure you will like your TC40D.

Now, let's take care of your nagging little problem. The adjustment you need is very simple and easy to accomplish. It should be done with the rear wheels jacked up off the ground on jackstands, but you can do it by trial and error without jacking the tractor. Look at the attached diagram. Over on the left side is a large nut attached to an eccentric shaft, #19. Also there is a bolt marked #7. You must loosen the lockbolt #7 and then turn the big nut slightly to null out the transmission relative to your pedals. If you have the tractor jacked up and on stands, you can start it and adjust until the wheels stop turning. That will be the perfect position. If you do it without being jacked up, you can make the adjustment, but you will have to start the tractor and see if you've gone in the right direction and far enough or too far. That's all there is to getting the tranmission in sync with the pedals.

Oh yes. . .make sure if you have the tractor jacked up, that you also move the MFWD lever to 2WD. You want the rear tires to spin freely off the ground. Of course if you are in 4WD, the front wheels may pull you off the jackstands. Not good! Also, if you have the rear wheels off the ground, you can check for a perfect adjustment by revving the engine with the pedals at neutral so that you can see that there is no wheel movement even at high rpm. Good luck!

BTW: In your original post you mentioned that the cam is centered on the roller. What this adjustment does is adjust the position of the roller so the cam will come to center at a slightly different spot and that will null out the transmission.

 

[sigjig]

Thanks Jinman, I saw that part yesterday while troubleshooting what I could, but wasn't sure what it's function was. I'll give it a try and let you know how it worked. Thanks again. Sig

 

[JC-jetro]

Once again, a great description of the transmission adjustment by Jim.

One minor suggestion here that I like to add. It might be prudent to park the tractor facing open barn/garage door with the rear end jacked up, or better outside facing an open field. In a remote chance of tractor coming of the jack stand while adjusting then it will safely drive without hitting major obstruction such as rear wall of your barn.. Yikes Timing got to be just right trying to get on moving tractor as well

JC,

Welcome to TBN Blue, for all your blue related questions.

 

[sigjig]

Jinman, The adjustment worked perfectley! JC Jetro, Thanks for words of caution, I had already faced the tractor out of the garage door..just in case. Thanks everyone for the advive and guidence. This is the best forum I have ever seen. Sig

 

[jinman]

Jinman, The adjustment worked perfectley! JC Jetro, Thanks for words of caution, I had already faced the tractor out of the garage door..just in case. Thanks everyone for the advive and guidence. This is the best forum I have ever seen. Sig

Wowwwww! It's a great feeling when you can suggest to someone how to fix something. It's even nicer when it works so quickly and they let you know about it. I am so pleased that tractor you just bought is fixed and you can enjoy it. Nice job! That made my day.

 

[eqarab]

Sigjig, welcome to TBN and the NH forum. I hope you come back often to visit and to post. I'm sure you will like your TC40D.

Now, let's take care of your nagging little problem. The adjustment you need is very simple and easy to accomplish. It should be done with the rear wheels jacked up off the ground on jackstands, but you can do it by trial and error without jacking the tractor. Look at the attached diagram. Over on the left side is a large nut attached to an eccentric shaft, #19. Also there is a bolt marked #7. You must loosen the lockbolt #7 and then turn the big nut slightly to null out the transmission relative to your pedals. If you have the tractor jacked up and on stands, you can start it and adjust until the wheels stop turning. That will be the perfect position. If you do it without being jacked up, you can make the adjustment, but you will have to start the tractor and see if you've gone in the right direction and far enough or too far. That's all there is to getting the tranmission in sync with the pedals.

Oh yes. . .make sure if you have the tractor jacked up, that you also move the MFWD lever to 2WD. You want the rear tires to spin freely off the ground. Of course if you are in 4WD, the front wheels may pull you off the jackstands. Not good! Also, if you have the rear wheels off the ground, you can check for a perfect adjustment by revving the engine with the pedals at neutral so that you can see that there is no wheel movement even at high rpm. Good luck!

BTW: In your original post you mentioned that the cam is centered on the roller. What this adjustment does is adjust the position of the roller so the cam will come to center at a slightly different spot and that will null out the transmission.

Sigjig, I recently experienced this issue on a new to me NH TC40(1991? series) and it was creeping both while going forward & reverse. I replaced the return spring, the replacement spring was an upgraded spring bigger and a little more firm. I have more room to adjust spring, just wasn't sure where to stop with it. I adjusted the eccentric nut and have the unit stopped from creeping forward, however it still wants to creep in reverse. I think i rotated the eccentric nut 360 degrees to find the right spot and just couldn't locate it. Once i stopped it from creeping forward, i tried adjusting it a bit in either direction to stop the rear creeping - going like an 1/8 of a turn at a time. I couldn't find the sweet spot. Any suggestions? Am i turning the eccentric nut too much at a time? Is it possible that the eccentric nut could be in more then one spot to work and I haven't found the right one? I did have the rear tires off the ground while making adjustments. Any other suggestions would be greatly appreciated. Your info was very helpful.

 

[JC-jetro]

Just a post to remember good ole Jim by , his word still is good even if after he is gone for many years. RIP dear Jim,

I don't have direct experience with hydro TC-40 to chime in. Hope others will. I would do the same thing you have done with forward motion for reverse just the same. Do it with as little as adjustment as you can,observe reverse motion until you can find the sweet spot, so in reverse it would not creep without pushing the pedal.

 

[spitter]

I fought mine for years till I replaced the pedal support "Mesics look up Tc 40 D Cat. Transmission, Diagram Pedals HST, Part #24 Pedal support #87300017" was bent and twisted enough that I couldn't adjust it correctly.

I changed every bushing, washer, shock magnet, in there and nothing worked till I changed the support. It was $513.23 but worth every penny.Good luck.

 

[dieselscout80]

Interesting

My TC45DA has started occasionally not wanting to return the forward pedal at times.

I greased the two pivots and it was still occurring.

Then a sprayed some dry lube on 15 and 17 the above picture and that helps.

However I wonder if the updated spring will help more?