280
Model Code Page
31. Autocontrol 2.2
1. 8. 2000
6000--8750
314 8
1. 6. 1999
Checking function of the differential lock
control (engine at idling speed). Concerning AC 2.3, see
page 314/10.
--- Depress the rocker switch front edge at which time the
lock indicator light comes on. If the 4WD switch is in the
middle position, also the 4WD pilot light lights up and the
4WD is engaged.
--- Turn the switch to the middle position at which time the
indicator light goes out (also 4WD disengages).
This shows that:
--- the rocker switch front and middle positions function
--- The lock indicator light functions
--- the 4WD automatics function and a lso relay K27.
--- Depress the switch front edge at which time the indicator
light comes on (also the 4WD engages, if the 4WD switch
is in the middle position)
--- 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. Note! Also 4WD
disengages, when the brake pedals are depressed sepa-
rately)
This shows that:
--- the brake pedal switches function
--- the switches are correctly positioned
--- relay K11 functions
--- 4WD relay K27 functions
--- Depress the switch rear edge at which time the ind. light
should come on (also the 4WD engages, if the 4WD switch
is in the middle position).
--- Depress the brake pedal/pedals at which time the ind.
light goes out (also 4WD disengages, when the brake pe-
dals are depressed separately)
--- Release the brake pedal/pedals. The diff. lock ind lights
must not come on and the lock must not engage. 4WD re-
mains on in the automatic position, when latched together
brake pedals are depressed.
This shows that:
--- the rocker switch rear position functions
--- relays K11 and K12 function
--- 4WD automatic s functi on
--- Depress the switch front edge and the ind. light comes on
--- Turn the lift/stop/lower switch to the transport position at
which time the diff. lock disengages. Ind. light, however,
remains on.
--- Turn the lift/stop/lower switch to the lowering position or
to the middle position and the differential lock engages.
This shows that:
--- lift/stop/lower switch functions
--- relay K13 functions
--- Drive the tractor at speed of 4 km/h and engage the lock
by pushing the rocker switch front edge down. Ind. light
comes on.
--- Make a tight turn, raise and lower the lift with the lift/stop/
lower switch at which time the diff. lock engages and dis-
engages.
--- 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
S22: Diff. lock control switch
K11, K12, K13: diff. lock control relays
S10E: Lift/stop/lower---switch of the ACB power lift
H20: Diff. lock pilot light
Y1: Diff. lock solenoid valve
S10 and S20: brake light switches
GR1: earth point in the rear part of the lever console
GR2: earth point in the roof
GR5: earth point under the dashboard on the cab front wall
V1: Solenoid valve diode housing (see picture on page
310/6C)
V2: AC 2.2 diode housing (see picture on page 310/6C).
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.
Picture 4. Differential lock control.
The system is supplied via the ignition switch and via the
fuse F27).
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