solenoid. To tilt the mast back, press the bottom
of the tilt/sideshift disk. This provides a voltage
signal at J8 Pin 13. The lift pump motor is
started, and the system controller then switches
to a low-voltage signal at J4 Pin 7, energizing the
tilt-back solenoid. During forward and back tilt
operation, the proportional valve is partially
opened to remove excess fluid. The
counterbalance valve maintains back pressure on
the tilt cylinders for steady forward tilt speed
when loaded. An orifice disc under the tilt
cylinder front port fitting on the manifold controls
the backward tilt speed.
To sideshift left, press the left side of the
tilt/sideshift disk. This provides a voltage signal
at J8 Pin 14. The lift pump motor is started, and
the system controller then switches to a
low-voltage signal at J4 Pin 5, energizing the
sideshift-left solenoid. To sideshift right, press
the right side of the tilt/sideshift disk. This
provides a voltage signal at J8 Pin 7. The lift
pump motor is started, and the system controller
then switches to a low-voltage signal at J4 Pin 8,
energizing the sideshift-right solenoid. During
sideshift operation, the proportional valve is
partially opened to remove excess fluid. There is
an orifice disc under the sideshift valve cartridge
to reduce the speed of operation of the sideshift
cylinders.
LIFT PUMP
Removal
NOTE
If the pump is replaced due to failure, also
replace the hydraulic oil filter element.
NOTE
If the lift pump and motor assembly has been
removed from the truck, skip to Step 6.
1. Tilt the mast to the full forward position.
2. Disconnect the battery and discharge the
capacitors.
3. Remove the front cover and top cover (refer to
FRONT COVER and TOP COVER Removal
procedures in the FRAME section).
4. Clean the area around the hydraulic
connections to the lift pump.
5. Disconnect the hydraulic lines from the lift
pump and cap them.
6. Remove the screws securing the lift pump to
the lift pump motor. [2 cap screws & lock
washers]
7. Separate the lift pump from the lift pump
motor and remove from the truck.
Replacement
1. Position the lift pump on the lift pump motor
shaft.
2. Attach the lift pump to the lift pump motor and
tighten the bolts to 30 lb-ft. [2 cap screws &
lock washers]
3. Attach the hydraulic lines to the lift pump.
4. Reinstall the top cover and front cover (refer
to TOP COVER and FRONT COVER
Replacement procedures in the FRAME
section).
5. Connect the battery.
LIFT PUMP & MOTOR ASSEMBLY
Removal
NOTE
The lift pump can be removed from the motor
without removing the motor from the truck
(refer to LIFT PUMP Removal procedure in
this section).
1. Disconnect and remove the battery, and
discharge the capacitors (refer to APPENDIX
A: INDUSTRIAL BATTERY, and the
ELECTRICAL section).
2. Remove the overhead guard (refer to
OVERHEAD GUARD Removal procedure in
the FRAME section).
3. Label and disconnect the power cables to the
lift pump motor.
4. Clean the area around the hydraulic
connections to the lift pump.
5. Disconnect the hydraulic lines from the lift
pump and cap them.
6. Attach a lifting device to the lift pump and
motor assembly for support.
7. Remove the bolts securing the lift pump and
motor assembly to the frame of the truck. [4
hex bolts, 4 flat washers, 4 flange lock nuts]
E
lectric
C
ounterbalance
H
igh
O
utput
Lift & Auxiliary
03/21/00
6.2
