How much "slip" on your TC hydrostatic?

jinman · Feb 12, 2004

Re: How much \"slip\" on your TC hydrostatic?

Brad, are you saying that you never spin the wheels under any load condition? If that is the case, I'd say you dealer is correct that the relief valve needs adjusting. If your tires spin except in situations where you have a lot of down-pressure on the rear wheels, then your tractor is probably normal.

What everyone has said about pedal control is very accurate. The most power to the wheels is in the lowest range with the pedal only down about 1/4. On my tractor, I can always spin the rear wheels (and one front wheel in 4wd) when I'm using my loader to scrape dirt; however, if I'm pushing against a big tree with the loader up about 8' on the trunk, the down pressure on the wheels will prevent them from turning and the relief valve will let go if the tree doesn't give up first. /forums/images/graemlins/smile.gif I even think my relief valve could be adjusted some too.

I think your dealer looking at your tractor and making an adjustment is the best solution. That way you can be sure your relief valve is set properly. /forums/images/graemlins/cool.gif

Bob_Skurka · Feb 12, 2004

Re: How much \"slip\" on your TC hydrostatic?

 if I'm pushing against a big tree with the loader up about 8' on the trunk 

OK, but why would you do that? /forums/images/graemlins/smirk.gif

jinman · Feb 12, 2004

Re: How much \"slip\" on your TC hydrostatic?

( if I'm pushing against a big tree with the loader up about 8' on the trunk

OK, but why would you do that? )

In a word, leverage . /forums/images/graemlins/grin.gif

Many of my large oak trees have a shallow root system. When the ground is wet, lots of them will just "give up" when I push over on them high enough up that I have significant leverage with my TC45D. I've pushed over old and diseased trees that are as big around as 12'. Some of them will break off at the ground, but most will push over, root ball and all. ...just my experience where I am. /forums/images/graemlins/smile.gif

If they are tough enough to withstand my onslaught, they get to live another day. /forums/images/graemlins/laugh.gif

DocHeb · Feb 12, 2004

Re: How much \"slip\" on your TC hydrostatic?

Tiiiiiimmmmmmbbbbbberrrrrrrrrr!!!!!!!.

Pushind down shallow-rooted trees is possible, but just don't try it on dead trees. You could get a dead tree rocking and have it break off towards you rather than away from you.

MikePA · Feb 12, 2004

Re: How much \"slip\" on your TC hydrostatic?

 as big around as 12'. 
12 feet! /forums/images/graemlins/shocked.gif

jinman · Feb 12, 2004

Re: How much \"slip\" on your TC hydrostatic?

( 12 feet! )

Ahh...what a difference the shift key makes. /forums/images/graemlins/laugh.gif

Isn't the spellin' check'r sposed to ketch thet?
/forums/images/graemlins/grin.gif
You got me! /forums/images/graemlins/blush.gif

SacandagaBrad · Feb 12, 2004

Re: How much \"slip\" on your TC hydrostatic?

The test results are in! I think it definitely needs to have the relief valve adjusted. Here's the experment:

Pushing a load of snow with the FEL with nothing more than chains on loaded turfs for traction on a crusty snow base, I built up a bank and then eased into it. Had the motor at about 2400 rpms, trans in low range. Eased into the bank with the pedal just down enough to be moving, met resistance and stopped the tractor, no wheels spinning. Kept the pedal there for 15 seconds or so with no change.

Backed up and tried again with the pedal about 1/4 of the way down. Went further into the bank before resistance was met, then it stopped with no wheels spinning. Kept it there for a few seconds again with no change.

Tried again with it down about a 1/3, stopped the tractor and began to spin one rear and one front, engaged diff lock and stopped the spinning. Tried to push the pedal all the way once stopped and slowed the motor to about 1700. Tried again, pushed it down all the way after forward progress had ceased and it fully engaged and stalled.

Bottom line - it didn't take much to stop the wheels, even with the light touch on the pedal. All your explanations made perfect sense to me and I appreciate the help. It led me to figuring this out and I will be calling the dealer to discuss. It just didn't seem right to me that the tractor could not pull itself out of a mud hole. It's a 4 wheel drive tractor! Should at least be able to spin the wheels and bury itself deeper /forums/images/graemlins/tongue.gif

Jinman - if I had a tractor that could push over 12 foot diameter oaks, I don't think I would touch a thing! /forums/images/graemlins/wink.gif

Thanks again, I'll let you know what the dealer finds.

Brad

jinman · Feb 13, 2004

Re: How much \"slip\" on your TC hydrostatic?

( if I had a tractor that could push over 12 foot diameter oaks, I don't think I would touch a thing! )

Next week I'm heading to California. Look out giant redwoods! /forums/images/graemlins/shocked.gif /forums/images/graemlins/laugh.gif

I'm glad you got a chance to test your tractor. It's funny that it reacted that way even when it's cold. When my tractor heats up in the summer, that's when I notice the slippage under load. When the transmission and fluid are cool, it's a little beast. ...but only to 12 inch trees. /forums/images/graemlins/blush.gif

LAGEORGE · Feb 15, 2004

Re: How much \"slip\" on your TC hydrostatic?

As you know I have had 2 New Holland TC 24D’s and both had a pressure relief valve that was set to activate much earlier than I would have wanted. The only difference between your concern and mine is that it only happened in reverse, never going forward. I often stalled my tractor out going forward at 2600 RPM but could never get it to do it in reverse. The tractor would just sit there and you could hear the relief valve opening. The dealer and the New Holland representative said that was normal and meant to provide safety to the operator. The problem I have with that is when pushing a load of dirt uphill in reverse it very often does not make it to where I want it. At times just the tractors weight is too much to get up the hill in reverse. Both of my TC 24D’s had the same problem. So if have the opportunity to get it fixed have them also adjust the reverse if possible and let me know if they could.

Hope this helps,

George

rh1346 · Feb 16, 2004

Re: How much \"slip\" on your TC hydrostatic?

My 33D has that same trait, and I find it annoying. I spent the last 14 years with a Ford 1120, and before that a Ford 5000, and both would take all the power I wished to send to the wheels - sometimes stalling, more often spinning - but I always knew what was going on, and never a problem in the drivetrain or anywhere else as far as I know.

With the 33D. when digging into hard dirt piles or pushing a lot of wet snow with a 7 1/2' plow, I sometimes call for full throttle, pedal to the metal, only to get frustrated as the relief overules me and the tractor sits there, dumb and useless. I much prefer the old style, when I made the decisions, and not the valve.