hydrostatic trans run dry

/ hydrostatic trans run dry #1  

dingo983

New member
Joined
Feb 12, 2011
Messages
11
Tractor
TO-20, NH 1725
My lower Pto seal on mythe 1531 had a big enough leak where I ended up running the transmission dry. It stopped dead in the field. After a while of holding down the petal, it would slowly move while making some pretty nasty noises.
My question is, what usually gives out first on a hydrostatic transmission when someone stupid (myself) runs it dry?
 
/ hydrostatic trans run dry #2  
My lower Pto seal on mythe 1531 had a big enough leak where I ended up running the transmission dry. It stopped dead in the field. After a while of holding down the petal, it would slowly move while making some pretty nasty noises.
My question is, what usually gives out first on a hydrostatic transmission when someone stupid (myself) runs it dry?
The hydrostatic transmission is swashplate type transmission likely destroyed. The oil flow is required to maintain an oil film between the moving metal parts. This is bad news I fear.:shocked:
 
/ hydrostatic trans run dry #3  
My lower Pto seal on mythe 1531 had a big enough leak where I ended up running the transmission dry. It stopped dead in the field. After a while of holding down the petal, it would slowly move while making some pretty nasty noises.
My question is, what usually gives out first on a hydrostatic transmission when someone stupid (myself) runs it dry?



Any warranty left on it? A good dealer?
 
/ hydrostatic trans run dry
  • Thread Starter
#4  
Ugh....Thanks for the replys. I just got the manual today. Guess I will be tearing it down this weekend.
Warranty is expired most likely. I bought it from a rental place.
 
/ hydrostatic trans run dry #5  
Ugh....Thanks for the replys. I just got the manual today. Guess I will be tearing it down this weekend.
Warranty is expired most likely. I bought it from a rental place.

Call a dealer with your serial number, you never know. Plus, thst phone call is free. Or, Contact AGCO.
 
/ hydrostatic trans run dry #6  
Man go buy you 5 gallons of fluid and pour in it. When it was pulling it had to have some fluid in it.

Let us know what you find.
 
/ hydrostatic trans run dry #7  
Man go buy you 5 gallons of fluid and pour in it. When it was pulling it had to have some fluid in it.

Let us know what you find.

that's what i'd do 1st. 5 gal. of fluid :thumbsup: and pray
wouldn't hurt any worse.
david
 
/ hydrostatic trans run dry #8  
Man go buy you 5 gallons of fluid and pour in it. When it was pulling it had to have some fluid in it.

Let us know what you find.

Agree, chances are it's fine.
 
/ hydrostatic trans run dry #9  
If you quit soon enough when you noticed it, filling it up with oil might turn out ok. Didn't do it any favors, but might work okyet.

Sounds like you weren't interested in quiting and investigating until it was all used up tho.... Stuff happens. We get to pay to learn. Ran a 140hp ag tractor out of hyd oil, hose tore under the cab, light came on, I drove to the edge of the field as rain was coming in 10 minutes....

Paid $4000 to fix up that short drive - hi-lo bearing seazed.

--->Paul
 
/ hydrostatic trans run dry #10  
Had a guy call me once and say that he ran is 8 speed powershift "a little low" on oil. He then asked if he hurt anything, I asked how low is low? He said it took 15 gal to fill it back up (it only hold like 16). I asked will it move? He said no, DAAAA There's you answer.

It took nearly $9000 to make it move again.
 
/ hydrostatic trans run dry #11  
If you quit soon enough when you noticed it, filling it up with oil might turn out ok. Didn't do it any favors, but might work okyet.

Sounds like you weren't interested in quiting and investigating until it was all used up tho.... Stuff happens. We get to pay to learn. Ran a 140hp ag tractor out of hyd oil, hose tore under the cab, light came on, I drove to the edge of the field as rain was coming in 10 minutes....

Paid $4000 to fix up that short drive - hi-lo bearing seazed.

--->Paul
A wet rolling element bearing should have handled that easily. Your oil was critical long before you knew it.
larry
 
/ hydrostatic trans run dry
  • Thread Starter
#12  
I filled the transmission with 5the gallons of hydraulic fluid and bled the system twice. When I start it and step on the petal nothing happens until about 5 minutes of holding the petal down. Then a loud clicking noise starts and it slowly starts moving. After 10minutes it starts rolling pretty good until I put a load on it, then it stops moving again. Takes another 5 minutes of stepping on the petal to repeat the clicking noise and inching forward, etc.
Thanks for your inputs guys.
 
/ hydrostatic trans run dry #13  
Sorry to hear that.
 
/ hydrostatic trans run dry #14  
I filled the transmission with 5the gallons of hydraulic fluid and bled the system twice. When I start it and step on the petal nothing happens until about 5 minutes of holding the petal down. Then a loud clicking noise starts and it slowly starts moving. After 10minutes it starts rolling pretty good until I put a load on it, then it stops moving again. Takes another 5 minutes of stepping on the petal to repeat the clicking noise and inching forward, etc.
Thanks for your inputs guys.


Are you going to tackle the repair yourself?
 
/ hydrostatic trans run dry
  • Thread Starter
#15  
I am thinking I may repair it myself. I just have to get an idea of how this hydrostactic transmission works so I know how to dianosis it.
 
/ hydrostatic trans run dry #16  
I am thinking I may repair it myself. I just have to get an idea of how this hydrostactic transmission works so I know how to dianosis it.



You may want to get a service manual, or do you have one?

Agcopubs.com and you can either order the print version, or the cd.
 
/ hydrostatic trans run dry
  • Thread Starter
#17  
I got the repair manual and wasn't that impressed with its clarity. Hopefully it all make sense when I start tearing it down.
 
/ hydrostatic trans run dry #18  
If you ran it dry I would suggest replacing the whole assembly - and you might contact your insurance company - they might cover the damage and repair less the deductable.
 
 
Top