CAT TH 83 drive issue

[Claus]

Perhaps some of the forum users have CAT Telehandler and have encountered a similar problem.
I have 2000 CAT TH83. First, 4th gear disappeared (you turn it on the control unit, but the loader does not move). Then sometimes the reverse gear did not turn on, but after several movements of the control unit handle forward/backward, the reverse gear could appear.
But recently the loader stopped completely and does not respond to the engagement of gears on the gearbox control unit at all...
Is this an electrical problem in the gearbox control unit?

 

[milton-95]

We used to have a 63 here and did similar ,first lost 4, then 1 i think it was, and fairly sure it lost reverse too, we had it tested by someone and it ended up having the transmission out and being rebuilt.

 

[Claus]

Maybe someone has a wiring diagram for the transmission control unit so I can check.

 

[icanshootwell]

Perhaps some of the forum users have CAT Telehandler and have encountered a similar problem.
I have 2000 CAT TH83. First, 4th gear disappeared (you turn it on the control unit, but the loader does not move). Then sometimes the reverse gear did not turn on, but after several movements of the control unit handle forward/backward, the reverse gear could appear.
But recently the loader stopped completely and does not respond to the engagement of gears on the gearbox control unit at all...
Is this an electrical problem in the gearbox control unit?

I'm assuming it's got the twist gear change, you need to check this, mine failed in 2nd gear, then the solenoid s,