My 1988 JD 755 4WD will not move. I parked it on a hill (front uphill) overnight and when I went back to work the next day it would not move forward or back. The bucket works and the backhoe works so I have hydraulic power. When I lift the wheels, the front spin freely by hand (4WD is engaged) but the rear seem locked. The only issue prior to not moving was a slight chatter that began after I replaced a hydraulic hose. I didn't bleed the hydraulics after replacing hose, so the chatter is likely air in the system. Any suggested solutions will be appreciated. Thanks, <font color="blue"> </font>
JD 755
- Thread starter EdMaine
- Start date
RobS
Super Member
Ed, does your tractor have HST or gear transmission? I can't help you either way but that information may trigger a thought for someone else /forums/images/graemlins/smile.gif
RobS
Super Member
I kind of suspected that it was a Hydro, and of course now I'm even less help for you /forums/images/graemlins/confused.gif
Did you check all the usual suspects though: safety switches ok, range/gear levers fully engaged etc /forums/images/graemlins/smile.gif
Did you check all the usual suspects though: safety switches ok, range/gear levers fully engaged etc /forums/images/graemlins/smile.gif
Hambone
Platinum Member
Sometimes we miss the obvious. Parking brake released all the way? I had mine stick once, I released it but the pedal did not come up all the way.
Might look under for linkage that came undone (range select?)
Does it make any kind of noise when you are trying to move? Engine grunt ect??
Tried engaging diff lock?
Might look under for linkage that came undone (range select?)
Does it make any kind of noise when you are trying to move? Engine grunt ect??
Tried engaging diff lock?
755inNY
Platinum Member
- Joined
- Jul 4, 2003
- Messages
- 560
- Tractor
- JD 4310, ehydro, 4WD, R4s
EdMaine,
I have never experienced this on my 755. Does the engine lug down when you step on the hydro pedal or is there no difference at all in RPM?
The manual only lists the following for "Tractor will not move with engine running"
>Park brake locked
>Transmission oil level low
>Transmission oil cold
>Engine cold
>Two speed axle shift lever in neutral
There is a seat interlock on the tractor. It will limit movement of the tractor if it is not engaged but I have never had mine prevent the tractor from moving at all. The interlock is a vertical shaft on the right side directly under the seat. It has a plastic hex top. The weight of the operator in the seat presses the shaft down allowing the hydro pedals to move. Every once in a while, in the winter, this shaft will get frozen in place and I have to bang on it to break it free. Maybe a combination of this interlock not working properly and cold or low fluid is preventing the tractor from moving.
Jeff
I have never experienced this on my 755. Does the engine lug down when you step on the hydro pedal or is there no difference at all in RPM?
The manual only lists the following for "Tractor will not move with engine running"
>Park brake locked
>Transmission oil level low
>Transmission oil cold
>Engine cold
>Two speed axle shift lever in neutral
There is a seat interlock on the tractor. It will limit movement of the tractor if it is not engaged but I have never had mine prevent the tractor from moving at all. The interlock is a vertical shaft on the right side directly under the seat. It has a plastic hex top. The weight of the operator in the seat presses the shaft down allowing the hydro pedals to move. Every once in a while, in the winter, this shaft will get frozen in place and I have to bang on it to break it free. Maybe a combination of this interlock not working properly and cold or low fluid is preventing the tractor from moving.
Jeff
tdenny
Platinum Member
Rob,
Just FYI the X55 series are all hydros.
Just FYI the X55 series are all hydros.
Thanks to everyone for their help--this is a great site! I hope to really dig in to the problem this weekend. When I try to go forward or back nothing much happens and as I mentioned in my orginal post, the rear wheels will not move when off the ground while the front do (even with 4WD engaged) so a stuck brake is a maybe. Safety switches seem to be ok and all levers seem to be engaged as they should be Hambone&755inNY--no the engine doesn't grunt or lug down nor is there any noticeable noise when I am trying to move (a slight indication that it's trying to do something --but very faint). Seat interlock seems to be fine & it was not that cold (I've use the 755 for plowing in many of very cold Maine winters without an issue.
Hopfully, this weekend will shed some light on problem -- hope it's not major /forums/images/graemlins/confused.gif <font color="blue"> Thanks again for all the suggestions.</font>
Hopfully, this weekend will shed some light on problem -- hope it's not major /forums/images/graemlins/confused.gif <font color="blue"> Thanks again for all the suggestions.</font>
OkieG
Veteran Member
Ed,
Did you try both High and Low range? The "cover plate" that has the detent slots (Rabbit, Neutral, Turtle), can sometimes slip. If the cover plate slips up or down a bit, it could move the detent slot to where the transmission is disengaged.
I've not had that happen on the Hi-Lo Range Selection lever, but have had it happen on the PTO Selection lever. If that is the problem, the cover plate is easy to adjust to get the lever back in proper alignment.
OkieG
Did you try both High and Low range? The "cover plate" that has the detent slots (Rabbit, Neutral, Turtle), can sometimes slip. If the cover plate slips up or down a bit, it could move the detent slot to where the transmission is disengaged.
I've not had that happen on the Hi-Lo Range Selection lever, but have had it happen on the PTO Selection lever. If that is the problem, the cover plate is easy to adjust to get the lever back in proper alignment.
OkieG
tdenny
Platinum Member
I've had the same problem as Okie with my PTO selector. The only time the tractor wouldn't move when I depressed on of the hydro pedals is when I had the loader dug in and forgot to raise it. Gosh I hate to admit that one. /forums/images/graemlins/grin.gif