Case 580SR Service Manual page 496

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4 SECTION 27 - REAR AXLE
ELECTRICAL DIFFERENTIAL LOCKING
OPERATION (Powershift)
S
WARNING
The differential lock fitted to this machine is operated
by oil pressure and controlled by an electrically op-
erated solenoid. The solenoid valve is energized by
means of the button (1) mounted in the right control
lever.
The differential lock effectively places both rear
wheels into a direct drive when selected, this action
stops one rear wheel spinning.
In conditions inducing wheel slip (differential lock not
2 3
yet engaged), press down the differential lock switch
and the lock will engage giving direct drive to both
rear wheels.
The lock will remain engaged until either of the foot
brakes are applied and the machine stops or by dis-
engaging the switch. The warning lamp on the in-
strument panel will turn off when the differential lock
has disengaged.
When selecting switch (1) on gauge cluster, the dif-
ferential is activated with the oil pressure supplied by
the transmission, which acts on piston (3) for differ-
4
ential locking.
F29548
This oil under a pressure of 13-14 bar, always avail-
able when the engine is running, is controlled by a
solenoid valve. When the switch is released (differ-
ential locking not necessary) oil is diverted to the fill-
er of the level dipstick (discharged) and the piston
spring (2) of the differential releases the locking (4).