Picture 7. 4WD control . The system gets the supply via
the ignition switch and fuse F22.
247
Model Code Page
31. Autocontrol II
1. 1. 1994
6000--8750 311 9
C. 4WD control
Checking function (engine at low idling speed):
--- Move the switch in the range gear lever knob to the front
position at which time the 4WD ind. light comes on.
This shows that:
--- 4WD switch functions
--- 4WD indicator light functions
--- Move the switch to the rear position and the ind. light goes
out.
--- Depress separately unlatched brake pedals. The 4WD
ind.lightmustnotcomeon.
--- Connect the brake pedals together and depress the
pedals at which time the 4WD engages (ind. light comes
on)
--- Release the brake pedals and the ind. light goes out.
This shows that:
--- brake pedal switches function
--- relays K7 and K15 function
--- Drive the tractor at speed of 4 km/h.
--- M a k e a t i g h t t u r n
--- Engage and disengage the 4WD several times. When the
4WD is engaged, you should see the front axle skid and
feel a jerk as you engage and disengage.
This shows that:
--- solenoid valve functions
--- 4WD clutch functions
Note! In case of malfunctions always check fuse F22.
When the 4WD is disengaged, the solenoid valve Y3 is ener-
gised and the nut at the end of the valve is magnetic which can
be verified e.g. with a screwdriver.
S30: 4WD switch in range gear lever knob
Y3: 4WD solenoid valve
H9: indicator light
S10 and S20: brake pedal switches
K7 and K15: Relays which engage the 4WD when latched
together brake pedals are depressed
Note! If you want to prevent engagement of the 4WD when
braking, relay K7 in the fuse box can be removed.
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