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3. Operation
3.8.20
Differential lock
The differential lock is used to ensure an even grip for the wheels. The differential
lock can be engaged while driving.
The differential lock has three positions: ON, AUTO and OFF
Position
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).
3.8.21
Engaging and disengaging the differential lock
You can control the engagement of the differential lock with the differential lock
switch. The switch has three positions (ON, AUTO, OFF).
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.
Description
The differential lock is always engaged except when:
•
One or both brake pedals are pressed (the lock re-engages when one or both pedals are
released).
•
When engaging the parking brake.
The differential lock engages when the following conditions are fulfilled:
•
The speed difference between the right and left rear wheel is sufficient.
•
The driving speed is over 1.5 km/h and under 15 km/h.
•
The wheels are in the middle position.
The differential lock disengages:
•
When the wheel slip is less than 6%. The disengaging delay is 5 seconds.
•
When the driving speed rises to over 15 km/h.
•
When the wheels are turned more than 20% from the middle position.
•
When pressing one of the brake pedals or both.
•
When pressing the lift/stop/lower switch to the lift position.
The differential lock is continuously disengaged.
- 120 -
is lit on the
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