Hello, I have a John Deere 35D Serial FF035DX236226. The unit tracks fine in standard travel mode. When you shift to Rabbit travel mode it turns to the right with both travel levers pushed forward equally as if the right track is moving slower than the left. I lifted the machine up and ran the case drain flow test per John Deere's direction and found got the following results: Left Travel motor leakage after 1 minute in standard speed: None Left Travel motor leakage after 1 minute in Rabbit speed: None Right Travel motor leakage after 1 minute in standard speed: None Right Travel motor leakage after 1 minute in Rabbit speed: 500 ML Spec is 300 ML/Min Max leakage per Deere's Test procedure so I think its safe to say my right travel motor is bypassing internally. My question is what are my options to repair? Has anyone rebuild one of these hydraulic motors themselves with internal replacement parts from Deere/others or does everyone just replace the entire travel motor? Can the travel hydraulic motor be removed without removing the track and final drive or do you have to pull the whole final drive then separate the travel motor? Thank You Joe
By removing the cover from the inside of the track frame you should be able to remove the motor. As per your description leads me to think the rotating group has worn or scratches on the valve plate which can be repaired by lapping it and if you have reasonable mechanical skills it's a job you can do yourself. If you do it hygiene is an absolute key to quality. Usually agents will only sell the complete item including the hub but with some scouting around parts should be available. Outfits like Travel Motors Direct here in Oz can help. One other thing, after fitting the motor FILL it with oil before starting the machine
Sounds like your travel speed control piston is leaking. A known issue with the Deere D series/Hitachi ZX-2 35's. It is easier to work on those motors with the entire final removed. If the bore for the piston is worn your buying an assembly.
Is the travel speed control piston inside the propel motor or propel motor valve assembly? Will a failure or worn component be pretty easy to spot upon disassembly?
I want to follow along with this. We traded in our old D for a plethora of problems, one of which was being stuck in low travel.
I've not been into one of these, but typically the piston motors will have a swash plate that is tilted by a shift piston. Most likely as mg2361 says a leak at the piston or in that circuit, usually O-rings somewhere blown out and leaking to case, or the piston has wallowed out the bore. On some obsolete Daikin drives, big mothers, we managed to bore the case and freeze install a steel sleeve, then hone to fit the piston. YMMV
I have a John Deere 35d that is doing the same thing (tracks fine in standard mode and in hi range it turns to the left). Was a travel motor the fox for this issue? Is there anything else to check for? Before I buy a new travel motor I would like to be sure that is the issue and it is not something else.
You shouldn't need to buy a new motor. First find if there's oil pressure in high speed, there will be none in low. If that's good then something like foreign matter jamming the piston can be the cause. At this point you don't need to remove the complete assembly.