Komatsu PC350LC-8, Operation & Maintenance Manual

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OPERATION
DETAILED CONTROLS AND GAUGES
3-77
Swing Lock Switch
WARNING
q
When not using the swing operation, e.g. when traveling, put the swing lock switch to the OFF posi-
tion.
q
On slopes, even when the swing lock switch is at the ON position, the weight of the work equipment
may cause the upper structure to swing if the swing control lever is operated in the downhill direction.
This switch (4) is used to lock the upper structure so that it can-
not swing.
(a) ON position (actuated): The swing lock is always applied,
and the upper structure will not swing even if the swing is oper-
ated. In this condition, the swing lock lamp lights up.
(b) OFF position (canceled): The swing lock is released, when
operating the swing control lever, allowing the upper structure
to swing.
Machine Push-up Switch
This switch (5) is used to switch the safety valve set pressure
at the head end of the boom cylinder to two levels.
(a) Low-pressure setting: The boom thrust force is weak, so the
swaying of the chassis is small during digging operations, and
digging operations can be carried out smoothly.
This is used for general digging operations on normal ground,
soft rock, or blasted rock.
(b) High-pressure setting: The thrusting force of the boom
becomes more powerful, so it is easy to escape from soft
ground.
Lower Wiper Switch
When this switch (6) is pressed, the lower wiper is turned on.
(a) ON: Lower wiper operates.
(b) OFF: Lower wiper stops.
Heated Seat
When the switch (7) is pressed, the heater will operate pro-
vided the ambient temperature is sufficiently low.
(c) ON: Heater operates. (see Note below)
(d) OFF: Heater stops.
Note: There is a temperature thermostat fitted in the seat cushion, the heater only operates when the temperature
is low (approx. 7° C or below).
(6)
(7)
a
b
c
d