8-4
2. Functions of respective parts
Input side (to the controller)
Output side (of the controller)
Name Functions
(1) Lifting height switch
Detects whether the signal is for low or high lifting height. The limit
switch provided on the outer mast side detects the height of inner
mast.
(2) Tilt angle sensor
Detects the mast tilt angle. This sensor at the front protector on the
upper side of RH tilt cylinder detects the mast tilt angle from the tilt
cylinder that rotates around the rear pin as the axis of rotation.
(3) Forward tilt switch
Detects the forward tilt operation of the tilt lever. The limit switch
provided to the tilt spool of the oil control valve detects forward tilting
movement when the tilt lever is operated.
(4) Backward tilt switch
Detects the backward tilt operation of the tilt lever. The limit switch
provided to the tilt spool of the oil control valve detects backward tilt-
ing movement when the tilt lever is operated.
(5) Tilt knob switch
A switch for automatically leveling the fork when it stops and for
slowing down the backward tilt speed at a low lift.
(6) Load sensor
Detects the load with a pressure sensor provided to the lift cylinder
hydraulic circuit.
(7) Traveling speed sensor
Detects the traveling speed from the motor revolution with a sensor
provided to the drive motor.
(8) Tire angle sensor
Detects the tire angle based on the center shaft turning angle with
the sensor at the top of the rear axle center shaft.
(11) Steering angle sensor
Detects the steering wheel position with the sensor provided under
the steering wheel.
Name Functions
(9) Integral control valve
Two solenoids are provided to the integral control valve.
• The heck valve and the solenoid valve installed to the tilt circuit
control the tilting action of the mast.
• The check valve and the solenoid valve on the lift circuit add the
key-off lift lock function to prevent the fork from lowering if the lift
lever for lowering is actuated by mistake while the key is turned
OFF.
(10) LCD display
If SAS function has any error, wrench symbol mark on the display
blinks, simultaneously buzzing alarm. In addition, an error code indi-
cates abnormal point.
SAS system always requires an initialization (matching) when an
SAS function-related service is provided. In this case, initialize the
system using the display. (See the section for the display)
(12)
Steering synchronizing
solenoid valve
The solenoid valve is installed to the correcting valve. The solenoid
valve is actuated by a command sent from the controller to open/
close the correcting valve. Opening-closing of the correcting valve
adjusts the hydraulic oil flow rate to the rear axle cylinder to correct
offset of the knob position.
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