Komatsu PC450-8 Operation & Maintenance Manual page 418

CONTROL LEVERS AND SWITCHES
WORK EQUIPMENT CONTROL LEVERS
(with auto-deceleration device)
This Left work equipment control lever (3) is used to operate the
arm and upper structure.
Arm operation / Swing operation
(a) Arm OUT
(b) Arm IN
(c) Swing to right
(d) Swing to left
N (Neutral):The upper structure and arm are held in position and
do not move.
When High Reach Equipment is fitted, the Shift button (7) is used
together with the left attachment control pedal (6) to control the
Intermediate Link operation.
This Right work equipment control lever (4) is used to operate the
boom and bucket. For machines fitted with hydraulic variable
gauge undercarriage the right control lever also operates the
undercarriage adjustment (in undercarriage adjustment mode)
Boom operation / Bucket operation
(a) RAISE
(b) LOWER
(c) DUMP
(d) CURL
N (Neutral):The boom and bucket are held in position and do not
move.
Hydraulic variable gauge undercarriage mode
(c) Undercarriage wider
(d) Undercarriage narrower
N (Neutral) : Undercarriage is held in position and does not move
REMARK
q The engine speed for all control levers (travel, work equipment, attachment) is changed as follows by the auto-
deceleration mechanism.
q When the travel lever and work equipment control levers are at the neutral position, even if the fuel control dial
is above midrange speed, the engine speed will go down to a midrange speed. If one of these levers is oper-
ated, the engine speed will rise to the speed set by the fuel control dial.
q If all the control levers are at the neutral position, the engine speed goes down approx. 100 rpm, then after
approx. 4 seconds, the engine speed goes down to the deceleration speed (approx. 1400 rpm).
7-8
HIGH REACH DEMOLITION EQUIPMENT 27M
7