John Deere 6910 Autoquad gear change problem.

Bill Turtle

Member
Location
Essex
As per the title, when started from cold our 6910 often won’t shift up or down on the 1-4 shifts, causing the gearbox to be out of synch with the dash readout; which then flashes, and the tractor has to be switched off and restarted to allow any shifts to be attempted again.
If the tractor is allowed to warm up well then it changes gear ok and is then fine all day.
Does anyone know whether this could be down to weak solenoids on the side of the gearbox or oil (witham oils WBTO), or something else?
 

Phil P

Member
Arable Farmer
Location
North West
Really you need to get the fault codes from the controller to help narrow down the issue. It could be a number of things, the 1-4 shifting uses a stepper motor on the side of the transmission to rotate the gear shift shaft. The fault could be anything from the shaft been stiff, the motor going weak, a fault in the motor driver, low voltage, a communication fault on the can system between the controller and the motor driver or the motor driver and the stepper motor.
Without any codes it’s a difficult one to diagnose.
 

Bill Turtle

Member
Location
Essex
Thanks @Phil P. I will try to have a look at error codes on Monday. To be honest I have owned this tractor for years, and it has been so reliable I had forgotten that it has a system for diagnostic codes. One of my favourite tractors, 50k as well!
 

Chop

New Member
As per the title, when started from cold our 6910 often won’t shift up or down on the 1-4 shifts, causing the gearbox to be out of synch with the dash readout; which then flashes, and the tractor has to be switched off and restarted to allow any shifts to be attempted again.
If the tractor is allowed to warm up well then it changes gear ok and is then fine all day.
Does anyone know whether this could be down to weak solenoids on the side of the gearbox or oil (witham oils WBTO), or something else?
Just wondering had u any look sorting auto quad on 6910 as I have the very same problem ?
 

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109: Monitor Farm takeover

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109: Monitor Farm takeover

Written by AHDB

The first episode in the Farm Excellence series of the AHDB podcast focuses on cereals & oilseeds. The Monitor Farm programme comprises a network of farmers from across the UK and Northern Ireland committed to driving innovation and best practice. They host regular meetings at their farms in which they discuss issues facing agriculture in their...
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