8-5
MAST CONTROL
■ General
Mast control includes the following functions:
1. Mast forward tilt angle control
Mast forward tilt angle control automatically controls the possible forward tilt angle of the mast
according to the state of the load and lifting height. It reduces the hazards of falling cargo or vehicle tip-
over if the tilt lever is carelessly operated for forward tilting.
2. Mast backward tilting speed control
Automatically reduces the mast backward tilting speed to prevent the load from breaking loose when
the lifting height is high [about 2 m (6.6 ft) or above.] For low lifting height, tilting speed can be reduced
by tilting the mast backward while keeping the tilt lever knob switch pressed.
3. Automatic fork leveling control
When operated for forward tilting with the tilt lever knob switch pressed, the fork automatically stops in
level position (with the mast in vertical position). This function is convenient for connecting/
disconnecting fork during cargo loading/unloading.
4. Key-off lift lock
The fork does not lower if operated for lift lowering (the lift lever is operated to the lowering side) when
the key switch is turned OFF. This function sharply reduces natural drop or forward tilting.
■ Schematic diagram of control block
Lifting height switch
Tilt angle
sensor
Tilt cylinder
Load sensor
Pump motor
Controller
Lift solenoid
Tilt solenoid
Oil control valve
Tilt limit switch
Tilt konb switch
Lift lever
Key-switch
PS
2
3
8
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