Komatsu PC490-11, Installation And Instruction Manual

Page: 171 / 492

LOCK LEVER
k k
WARNING
• When leaving the operator's seat, set the lock lever securely to LOCK position. If the lock lever is
not at LOCK position and the control levers or control pedals are touched by mistake, it may lead to
serious personal injury or death.
• Always check that the lock lever is in LOCK position.
• When pulling the lock lever up, or when pushing the lock lever down, be careful not to touch the
work equipment control lever.
• Before setting the lock lever to FREE position, make sure that all control levers and pedals are set
to NEUTRAL position. If any of them is out of NEUTRAL position, the work equipment or machine
may move suddenly and cause a serious personal injury or death.
The lock lever is a device to lock the work equipment, swing,
travel, and attachment control levers (if equipped).
(L) LOCK position
Even when levers or attachment control pedal (if equipped) are
operated, machine does not move
(F) FREE position
Machine moves according to operation of levers or attachment
control pedal (if equipped).
REMARK
The lock lever is of hydraulic lock type. Accordingly, when it is
in LOCK position (L), the control levers or control pedals move
but the machine does not move.
Automatic lock function of lock lever
k k
WARNING
• The lock lever automatic lock function assists the operator in judgment to reduce damage caused
by accident. It does not stop the work equipment or machine in all situations.
• Even if the lock lever automatic lock function works, the work equipment or machine may not stop
immediately or may stop after moving by a certain distance. Also, the lock lever automatic lock
function may not work in the following cases. Accordingly, do not rely on it too much.
• When the hydraulic oil temperature is low (When the hydraulic oil temperature warning lamp in-
dicates low temperature)
• When the viscosity of the hydraulic oil used is higher than that of the genuine hydraulic oils
which Komatsu recommends
• Before setting the lock lever to FREE position, make sure that all control levers and pedals are set
to NEUTRAL position. If any of them is out of NEUTRAL position, the work equipment or machine
may move suddenly and cause a serious personal injury or death.
OPERATION EXPLANATION OF COMPONENTS
3-99