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Tractor Talk Discussion Forum

Rebuilding a hydrostatic trans.

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Hurst

05-27-2005 15:44:12




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I have an older ford cm222 commercial mower (22 hp diesel) and in the past couple of years the hydrostatic trans. has gotten weak in forward. This summer I was thinking about rebuiding, can anyone tell me what is involved in rebuilding one of these units and what is inside of them and how hard of a job this would be. Thanks

Hurst




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RickB

05-29-2005 04:46:51




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 Re: Rebuilding a hydrostatic trans. in reply to Hurst, 05-27-2005 15:44:12  
You are barking up the wrong tree. The rotating group sounds fine; else it wouldn't go in reverse. Buy a service manual if you haven't. Then read it. Sounds to me like a control linkage problem, or a forward side relief valve problem and fiddling with the linkage is speeding up the reverse side.



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Rod F.

05-29-2005 10:30:54




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 Re: Rebuilding a hydrostatic trans. in reply to RickB, 05-29-2005 04:46:51  
I think you're on the right track too. There should't be any need to adjust the linkage on a hydrostat. The part that confuses me is why this adjustment seems to help, when he is taking speed away from forward travel, and giving to reverse. Definitely time to review some manuals.

Rod



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Hurst

05-29-2005 12:14:04




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 Re: Rebuilding a hydrostatic trans. in reply to Rod F., 05-29-2005 10:30:54  
We aren't adjusting it to take away from forward and give to reverse, we are taking away from reverse and giving to forward, but over about a week, it is fast in reverse again and forward in hight is about 1/2 of what it should be and the adjustments are right where they were last time. Does this make since? Thanks.

Hurst



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Rod F.

05-28-2005 09:24:10




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 Re: Rebuilding a hydrostatic trans. in reply to Hurst, 05-27-2005 15:44:12  
Hi Hurst,
There is a lot to be said for the comments that Gene has made. Hydrostat repair is often considered a speciality job. That said, I know where you're coming from on cost. Something sounds a little queer though. You say that reverse keeps getting faster, and forward slower, and you can't adjust any more? You aren't simply adjusting the pedal or control linkage are you? With a hydrostat, you are just moving the swash plate in an axial piston pump, and the linkage must be centered. You may actually be able to move the pump plate further than the linkage would normally allow when properly adjusted. I know this is the case in my skidsteer. Check that out before condemning the pump. Also, since you seem interested in these things, I'll make one other suggestion to you. Contact mother Deere, send them some money, and they will send you an excellent reference publication titled John Deere, FOS (Fundamentals of Service) Hydraulics. The have many FOS books. I have Hydraulics and Electrical Systems. I know there are many more. I've never been a big fan of Deere equipment, but they do publish and excellent general reference training manual. It might be some of the best money you ever spend. Just a thought to keep in mind, if you don't already have a copy. Have fun.

Rod

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javad

04-11-2006 02:36:31




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 Re: Rebuilding a hydrostatic trans. in reply to Rod F., 05-28-2005 09:24:10  
Hi
please helpe me
I want to buy FOS books
How can i buy those? pleas give me addres of shop



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Mac

05-28-2005 17:09:42




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 Re: Rebuilding a hydrostatic trans. in reply to Rod F., 05-28-2005 09:24:10  
Sounds like flow control problem, not pump.



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Hurst

05-28-2005 18:15:44




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 Re: Rebuilding a hydrostatic trans. in reply to Mac, 05-28-2005 17:09:42  
Would it be a valve going bad like on a tractor's hydraulics? How do you fix this? Thanks.

Hurst



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Hurst

05-28-2005 11:04:53




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 Re: Rebuilding a hydrostatic trans. in reply to Rod F., 05-28-2005 09:24:10  
The linkage we have been adjusting is the pedal linkage to the transmission. Is there another rod that needs to be adjusted? Also, it does get a little wead going up a hill backwards (2wd on the front, go up backwards to shift the weight of the mower to the front wheels). We were where we had to adjust it about every 20-30 hours to keep it going, does this sound like the transmission or something else? Thanks for your help.

Hurst

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Gene Davis (Ga.)

05-27-2005 19:16:02




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 Re: Rebuilding a hydrostatic trans. in reply to Hurst, 05-27-2005 15:44:12  
This is a job that requires a super clean enviroment, special tools and gauges for measuring tolerances, torque wrenches,and a good set of specfications to measure and check tolerances of each wear prone part against the factory specifications. There is a lot to be said also for being familiar with the job. It is also nice that they can put it on a test stand and be sure that it performs correctly before being installed in the tractor. It can be done by a good mechanic, but I personally think that it is better when done by the experts and then warranted by them.

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Hurst

05-28-2005 08:14:28




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 Re: Rebuilding a hydrostatic trans. in reply to Gene Davis (Ga.), 05-27-2005 19:16:02  
I was just going to put in all new seals in the motor and pump. It still works, but in forward it is slow and the rods have been adjusted out as far as they can. Reverse just keeps getting faster and faster and takes the speed away from the forward. Does this problem sound like anything particular, or just the seals going out? This mower isn't worth what it would cost to have it done professionally, so that was why I was going to do it on my own. Thanks.

Hurst

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