Vehicle System System Operation 21
In addition to the basic hydraulic operation, there is
safety unload function on the first block of control
valve that lifting and tilting don’t work even though
its lever is shifted, when operator leaves a seat for
more than 3 seconds. The solenoid valve (28) for
unload function is electrically connected to the
electric on-off switch beneath a seat. When the
operator leaves a seat for more than 3 seconds, the
solenoid valve (28) becomes off. This lets system
pressure go down to low pressure. Once the
operator sits on a seat, the solenoid valve becomes
on and immediately all functions work normally.
There is a safety lift lock function on lift block that
lowering of carriage or mast becomes unable if the
lift lever is shifted for lowering, when the operator
leaves a seat for more than 3 seconds or a start key
is off. The solenoid valve (27) for lift lock is
electrically connected to the electric on-off switch
beneath a seat. When the operator leaves a seat
for more than 3 seconds or a start key is off, the
solenoid valve become off. This leads to block the
lowering flow passage. Once the operator sits on
seat, and a start key is on, the solenoid valve
becomes on and immediately lowering works
normally.
On the emergency that lowering doesn’t work
normally, the button of emergency manual override
valve (29) should be pushed and twisted 180 degree
counterclockwise. Then, the override will be locked
in position until released. This makes it possible to
lower the mast or carriage when lift spool is shifted
for lowering. After lowering the mast or carriage to
the ground and a start key turning off, the suspected
causes can be inspected. Its detailed trouble
shooting guide will be shown in TESTING and
ADJUSTING. To release the manual override, the
push button should be pushed and twisted 180
degree clockwise.
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