My neighbor has a John Deere 655B loader/crawler that has a hydraulic oil leak. Due to health reasons, he can no longer work on it, so I am going to try to fix it for him. I have never worked on this type of machine before. I crawled up under the dozer from the rear and could look up through 3 openings just forward of the counterweights and see what I assume is some type of pump where the oil seems to be coming from, but I can't get any tools up there to work on it. Can anyone tell me if I need to remove the counterweights or the seat and battery tray or both to get into this area to work on the leak? If anyone has a parts diagram or service manual for this area that they could share with me that would help alot also. Thank you very much.
- Thread starter JD60677
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Anonymous-0
Well-known Member
That's a hydrostatic machine so you might want to get a service manual or talk to a JD dealer first. It might require very specific repair procedures. In addition to the hyd. pump, there's 2 hydro pumps and motors that could leak. Might be a charge pump too.
Lou from Wi.
Well-known Member
Your best bet would be contact Lavoy or Jd Marris. These guys know the J.D machines.Other wise Stick weld will pressure you to know how much it cost to repair it. LOU.
If you are not a pretty accomplished mechanic you are going to be before this is over. The rear of that machine has two (One for each side) Hydrostatic transmissions. They are driven from a splitter box on the back of the engines. Any oil leak besides a external hose will require the removal of the complete unit and rebuild. Quite expensive even if you can find someone beside mother deer to do the work. Last thing in the world most folks that know is a 20/30 year old John Deer hydrostatic. Pretty much a money pit.
Anonymous-0
Well-known Member
Maybe he'd be lucky and it's something that is just loose or needs a seal replaced. If not, despite what Lou thinks, it would be a good idea to get an estimate first if you have to do a major repair. Lou has this bizarre idea that you shouldn't follow a budget when fixing machines because you never what you'll run into. Sounds like a good way to spend more on repairs than a machine is worth. A 655B in working condition is a very good machine but if the hydro's go bad could be real expensive, real fast.
Thing is you are right he may find an external seal that looks like it is the source of the leak but it will be a worn out hydrostatic with high case pressure causing the leak. And as you say if even ones side is out will cost more than the machine is worth to fix it. That is why the 20 yr old hydrostatics just do not sell well. Money pit one way or the other.
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