7-14
3. Lowering operation with key-OFF (key-off lift lock)
Operating the lift lever to the lowering side when the key is turned OFF, the lift spool moves to the right
side. Since the solenoid valve is OFF then, the hydraulic oil in the lower part of the logic valve does not
flow to the tank port because of the check valve in the solenoid valve. Thus no pressure difference is
generated between the C1 port and the lower part of the logic valve. Consequently, the logic valve
remains closed. Since the C1 port and the tank port circuits are cut off, the fork does not go down even
when the lift lever is operated in the downward direction when the key switch is turned OFF.
C1
Lift spool
Pump port
Tank port
Lift cylinder
Logic valve
Check valve
Solenoid valve
To Next Page
Loading...
Need help?
General
