I have a New Holland TM125 tractor with a Range Command gearbox. I want to know what the fault may be. Whenever I try to move from B6 to C1 it registers at the controls - neutral and tractor will not move forward or back..

Noel Lockhart, September 2011

Does the gearbox calibrate o.k.? Any error codes? Do you have any other gear change faults?

When making the gear change you discribe The B range/reverse synco moves to neutral and the a/c range syncro moves from neutral to engages into c range plus clutch pack changes.

The fault could be machanical, hydraulic or electrical.
More info required. I would check the synco rail pots and rail movement and check the pressures in the syncos

Ash, December 2011