JD 4200 won't go forward or backwards and PTO won't function

   / JD 4200 won't go forward or backwards and PTO won't function #1  

Surveyor4200

New member
Joined
Aug 29, 2018
Messages
22
Location
Oklahoma
Tractor
JD 4200
I have a JD 4200 HST that will not move forwards or backwards and the PTO will not function. I was brush hogging (just grass, not clearing woods or anything) and my forward function quit working as did my PTO. I didn't 'feel' anything give or hear anything break. I found a thread for a 4310 discussion where the range selector shaft broke; but mine seems to be intact. It will go through the different gears just fine and you can feel them changing. The PTO light comes on but the shaft does not spin. I checked the fluid levels and all seem to be just fine. Is there an electrical component that would affect forward/backward and PTO functions? I'm not getting the hydrostatic 'whine' when pressing the pedals like maybe a switch isn't getting hit or something. Thanks.
 
   / JD 4200 won't go forward or backwards and PTO won't function #2  
A seat safety switch will kill forward/reverse if the switch fails or the wire is severed...not sure about the PTO function.
 
   / JD 4200 won't go forward or backwards and PTO won't function #3  
I would look under it for broken/disconnected wiring, or a stick in the pedal linkages.
 
   / JD 4200 won't go forward or backwards and PTO won't function
  • Thread Starter
#4  
The previous owner bypassed the safety switch on the seat. I believe the switch would kill the tractor if trying to go forwards or backwards if not in the seat.
 
   / JD 4200 won't go forward or backwards and PTO won't function
  • Thread Starter
#5  
I would look under it for broken/disconnected wiring, or a stick in the pedal linkages.

That's how I started my troubleshooting, and I was able to trace the linkage all the way to the center housing. Everything appeared to be connected and moving well with no obstructions. I was wondering if there was an electrical component that controlled both functions; but haven't found anything.
 
   / JD 4200 won't go forward or backwards and PTO won't function #6  
Does Reverse still work properly? As others said linkage is the most probable cause. The other option could be forward pressure relief valve could be faulty. Just out of curiosity do you still have power steering? Did PTO cut out at exact same time the fwd drive was lost.
 
   / JD 4200 won't go forward or backwards and PTO won't function
  • Thread Starter
#7  
Does Reverse still work properly? As others said linkage is the most probable cause. The other option could be forward pressure relief valve could be faulty. Just out of curiosity do you still have power steering? Did PTO cut out at exact same time the fwd drive was lost.

Forward and Reverse do not work. PTO cut out at the exact same time. The rest of the hydraulics work perfectly, so I ruled out the pump.
 
   / JD 4200 won't go forward or backwards and PTO won't function
  • Thread Starter
#8  
Going through the repair manual and the only component I'm seeing that could affect the forward/reverse and PTO would be the hydrostatic motor. I'm trying to figure out how to test this without splitting the tractor; has someone on here had this go out on a similar model?
 
   / JD 4200 won't go forward or backwards and PTO won't function #9  
The previous owner bypassed the safety switch on the seat. I believe the switch would kill the tractor if trying to go forwards or backwards if not in the seat.

Maybe there is a break in the wiring for the seat switch and the tractor now thinks there is no operator?
 
   / JD 4200 won't go forward or backwards and PTO won't function #10  
Will your FEL or 3ph work? If not, your driveshaft Ujoint likely broke. Happened on my JD 4010. Nothing would work. Steering does, but hard.

Ralph
 

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