Operation and maintenance manual

Inspection, Maintenance and Adjustment
4-25
DX140R/DX140LCR
Inspect Structure for Cracks and Faulty
Welds
1. During the daily walk-around inspection and when
greasing the machine, look for any visible damage to the
machine. Repair or replace any damaged parts before
operating the machine.
Check Operation of All Switches
1. Verify the working condition of all switches before starting
the engine.
Check the Operation of Pilot Cutoff Switch
A pilot cutoff switch has a pivoting safety lever that deactivates
the work group, swing and travel control functions.
When the safety lever is moved down
into "LOCK" position, the
work group, swing and travel control functions are deactivated.
When the safety lever is moved up in
to "UNLOCK" position, the
work group, swing and travel control functions can be operated.
Inspection and Maintenance of the Pilot Cutoff Switch
1. Check for and keep bystanders away from the work area.
Sit in oper
ator's seat and fasten seat belt.
2. Start engine and move safety lever up into "UNLOCK"
position.
3. Operate the work group (joystick) levers in all
directions to
check that the boom, arm, bucket (or other attachment)
and swing functions operate correctly. Also, check that the
travel controls operate properly.
NOTE: Hy
draulic system must be warmed up to
operating temperatures.
4. Raise the boom and arm so the bucket (or other
attachme
nt) is about 1 m (3 ft.) off the ground.
5. Move the safety lever down into "LOCK"
position to
deactivate the work group and travel functions. Move the
work group (joystick) levers. There must be no movement
Lock
Unlock
EX1300566
Figure 37
WARNING
AVOID DEATH OR SERIOUS INJURY
The PILOT CUTOFF SWITCH (safety lever) must deactivate
the wo
rk group, swing and travel control functions when
the safety lever is moved
down into "LOCK" position.
Contact your DOOSAN distributor imme
diately if the
controls do not deactivate. DO NOT MODIFY THE SYSTEM.