John Deere 855 Hydraulic Problem

   / John Deere 855 Hydraulic Problem #1  

jimsing

New member
Joined
Nov 28, 2010
Messages
5
Tractor
1997 JD 855
Hi all, I have a JD 1998 855 25 Hp hydrostatic drive and when the tractor gets hot, the transmission slips but the front end loader works fine. I changed fluid, filter and cleaned the screen, which looked good, and that didn't help. I then put new O-rings in the pump and that didn't help. I then changed out the hydraulic pump with another used pump and it helped some but it still slips once you work it hard for half an hour or so. Any other thoughts outside of taking it to the dealer and letting them have their way with it?

Would changing over from HyGard LowVis to HyGard HighVis help?

Thanks in advance
 
Last edited:
   / John Deere 855 Hydraulic Problem #2  
In a hydrostatic transmission the main tractor hydraulic pump has next to no involvement in the HST operation.
Suggest you post in a JD section of this forum as your problem is really not hydraulic
Dave M7040
 
   / John Deere 855 Hydraulic Problem #3  
Hydrostatic transmission might have a charge pump.
 
   / John Deere 855 Hydraulic Problem
  • Thread Starter
#4  
In a hydrostatic transmission the main tractor hydraulic pump has next to no involvement in the HST operation.
Suggest you post in a JD section of this forum as your problem is really not hydraulic
Dave M7040
Thanks Dave. I think we've figured it out. I replaced the HyGard LowVis with 15w40w oil, suggested by the local JD dealer, and it seems to be working a lot better. At least for now.
 

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