D-200 Transmission Weak

[Texas Todd 1,025]

So I get the tilt cylinders rebuilt and want to see what I can lift. So I get the D loaded to go to up to my land.

 

Got some sizable rocks moved.

I got this one moved and then put on the rear blade to get some ballast. I could use some more weight and I am looking for ways to do that.

 

After about 45 minutes, the transmission seemed to lose it's power.  Where it would spin the tires trying to dig under this first rock, it didn't afterwards.  Though not an emergency at this time, the lifting is the most important and it seemed to transport them fine.  My question is this. I have another transmission from a D-180 (although it may have the same issue, I don't know). Should I swap the trannys like I did the engines or rebuild the transmission that is on it?  Will rebuilding fix this issue?

I haven't looked to see how these are attached, but are they as straightforward as the C tractors transmissions?

 

Thanks for your input!

 

I most likely won't attempt it anytime soon, just wanted to get the wisdom of the group.

 

 

[pfrederi 17,723]

http://www.wheelhorseforum.com/files/file/24-transmission-hydro-sundstrand-sm-492-4206pdf/

 

Download the Sunstrand manual from here.  Look at trouble shooting, there is a chart on "Loses power when hot"

 

Usually it is a symptom of a hydro with problems.  Dirt metal chips what ever have damaged the valve plates and when it gets hot and the oil thins there is a lot of leak by hence less power.    D's are not easy to work n and it has a separated system...the pump up by the engine the motor on the side of the transaxle.  Since the dirt moved through both pump and motor you will have to repair both...just replacing the hydro motor (the easy part) will probably not solve your issue.  There are several threads here about overhauling the pump and motor after you get them off.

Edited April 9, 2017 by pfrederi

[daveoman1966 3,751]

The symptoms you described...loss of power when warmed up...is typical of a worn out Sundstrand hyd power pump and / or motor.  Aside from possible linkage connections, the D-180 and D-200 Sundstrand units are the same.  The only cure for the power loss is to rebuild BOTH the hyd PUMP and the separate hyd MOTOR.  The engine drives the pump which, by a 4-line hyd line set, drives the hyd motor that is bolted to the gear box.  Thus the term 'separated' system. The internal brass parts (and others) get scored from contaminated fluid (oil  or ATF) and these score marks allow hot oil to bypass, thus losing hyd pressure, resulting in power loss.  Not an easy fix, by any means.  I have done several of these rebuilds and can provide guidance...to a degree...of 'how to'.  If you undertake this project, include new seals, o-rings, gaskets, etc in the process.  Here is an example of damaged internals that you will find....pump and motor.  

for further details or 'how to' info, please contact me via email, outside of ths Red Sq forum

I am :  daveoman@windstream.net      

[Texas Todd 1,025]

Ya know when I went to change the tran oil right after I acquired the tractor and noticed a red wheel horse filter on it, I kinda figured it wasnt well-maintained.

Thanks guys. Sounds like a winter project once I get my new shop built.....

[pfrederi 17,723]

The Front End loader and its frame have to come off, if you have a rear PTO it has to come off.  I have often said when they built D series tractors a guy stood in a the room holding the hydro pump....they then built the tractor around it.  I would take apart the units on your parts tractor open them up and see what shape they are in.  Then if they are repairable go ahead and overhaul them.  Then put them on you FEL tractor..save its pump/motor for future overhaul.  No way go through the trouble and work swapping out units on your FEL tractor until you know the replacements are good.  I have bought more than one pump/motor all of which came from "Good working tractors"   all of them had issues some so bad they must have towed them to the salvage yard.

[Texas Todd 1,025]

Makes sense. Thanks!