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3. Operation
3.8.18
Differential lock
3.8.18.1
Differential lock
The differential lock is used to ensure an even grip for the wheels by locking the
rear wheels to rotate at the same speed. The differential lock can be engaged
while driving.
The differential lock has three positions: ON, AUTO and OFF.
ON
AUTO
OFF
When the differential lock is engaged, the indicator light
instrument panel.
If the indicator light on the instrument panel flashes in the automatic position,
there is an error, and the differential lock disengages for safety reasons. The
reason for the error may be one of the following:
•
The speed sensors are not calibrated.
•
The turning angle sensor is not calibrated (contact an authorised Valtra
workshop).
•
There is a fault in the switch (the service code is displayed).
•
There is a fault in the speed sensors (the service code is displayed).
3.8.18.2
Engaging and disengaging the differential lock
You can control the engagement of the differential lock with the differential lock
switch.
If a wheel starts to slip, engage the differential lock. If a wheel is slipping heavily,
reduce the engine speed before engaging the lock. If possible, disengage the
lock while driving on public roads.
NOTE: For optimum performance, engage the differential lock before a wheel
slips.
The differential lock is engaged except in the following conditions:
•
One or both brake pedals are pressed (the lock re-engages when the brake is released).
•
The parking brake is engaged.
The differential lock engages in the following conditions:
•
The wheels are in the middle position.
•
The lifting/stop/lowering switch is in the lowering position.
The differential lock disengages in the following conditions:
•
The lifting/stop/lowering switch is pressed to the lifting position.
•
One or both brake pedals are pressed.
•
The clutch pedal or the HiShift push button is pressed.
•
When the wheels are turned more than 20% from the middle position.
The differential lock is always disengaged.
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is lit on the
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