INTRODUCTION 18000 SERIVCE/MAINTENANCE MANUAL
1-76
Published 12-05-17, Control # 035-23
Cab Tilt
See Figures 1-39 and 1-45 for the following procedure.
The cab tilt cylinder is attached to cab frame. During normal
operation the cab tilt solenoid valve is “motor spooled” where
both cylinder ports and tank port of valve spool section are
connected in center position. The cab tilt switch is on the
right side console in operator’s cab.
When top of cab tilt switch (raise front of cab) is pushed and
held, an input voltage is sent to node-1 controller. Node-4
controller sends a 24 volt output to enable cab tilt up solenoid
valve HS-37 and shifts valve to the up position. Node-5
controller sends a variable zero to 24 volt output voltage to
enable accessory system proportional relief valve.
Hydraulic fluid pressure at approximately 3,000 psi (204 bar)
flows to cab tilt accessory valve. Hydraulic fluid exits valve
and enters free-flow check valve before entering piston end
of cylinder, extending cylinder rod to raise the cab front.
Hydraulic fluid from rod end of cylinder enters free-flow
check valve before entering accessory valve and returns to
tank. When cab tilt switch is released, solenoid valve HS-37
returns to center position.
When bottom of cab tilt switch (lower front of cab) is pushed
and held, an input voltage is sent to node-1 controller. Node-
4 controller sends a 24 volt output to enable solenoid valve
HS-38 and shifts valve to the lower position. Node-5
controller sends a variable zero to 24 volt output voltage to
enable accessory system proportional relief valve.
Hydraulic fluid pressure at approximately 3,000 psi (204 bar)
flows to cab tilt accessory valve. Hydraulic fluid exits valve
and enters free-flow check valve before entering rod end of
cylinder, retracting cylinder rod to lower the cab front.
Hydraulic fluid from piston end of cylinder enters free-flow
check valve before entering accessory system valve and
returns to tank. When cab tilt switch is released, solenoid
valve HS-38 returns to center position.
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