Checking Function Of The Differential Lock Control - Valtra 6000 Workshop Manual

31. Autocontrol II
Checking function of the differential lock
control
(engine at idling speed)
--- Depress the rocking switch front edge at which time the
lock indicator light comes on.
--- Turn the switch to the middle position at which time the
indicator light goes out.
This shows that:
--- the rocking switch front and middle positions function
--- The lock indicator light functions
--- Depress the switch front edge at which time the indicator
light comes on
--- Disconnect the brake pedals and depress the pedals sep-
arately and together. When depressing the pedal/pedals,
the diff. lock ind. light goes out and the brake lights comes
on. When the pedal/pedals are released, the ind. light
comes on and the brake lights goes out.
This shows that:
--- the brake pedal switches function
--- the switches are correctly positioned
--- relay K11 functions
--- Depress the switch rear edge at which time the ind. light
should come on.
--- Depress the brake pedal/pedals at which time the ind.
light goes out.
--- Release the brake pedal/pedals. The diff. lock ind lights
must not come on and the lock must not engage
This shows that:
--- the rocking switch rear position functions
--- relays K11 and K12 function
--- Depress the switch front edge and the ind. light comes on
--- Turn the lift/lower switch to the transport position at which
time the diff. lock disengages. Ind. light, however, remains
on.
--- Turn the lift/lower switch to the lowering position or to the
middle position and the differential lock engages.
This shows that:
--- lift/lower switch functions
--- relay K13 functions
--- Drive the tractor at speed of 4 km/h and engage the lock
by pushing the rocking switch front edge down. Ind. light
comes on.
--- Make a tight turn, raise and lower the lift at which time the
diff. lock engages and disengages.
--- You should see the rear tyres skid when the differential
lock is engaged and feel a jerk as you engage and disen-
gage. The front axle lock functions in the same way, if
fitted (during the test the 4WD should be disengaged).
This shows that:
--- solenoid valve functions
--- differential lock functions
1. 1. 1994
Picture 6. Differential lock control.
The system is supplied via the ignition switch and via the
fuse F27).
Important! Always check the fuse F27, if there is malfunc-
tions in the control system. The diff. lock solenoid valve is fitted
on the lower side of the valve block on the LH side of the gear-
box. The rearmost valve Y1 is for the diff. lock. When the lock
is on, the solenoid valve is energised. Then the nut on the
valve is magnetic which can be verified with e.g. a screw-
driver.
246
Model Code
6000-- 8750 311
Page
8