Dumping - Komatsu 530M Operation & Maintenance Manual

Operation - Section 3
Page 3-8

DUMPING

1. Pull into dump area with extreme caution. Make
sure area is clear of persons and obstructions,
including overhead utility lines. Obey signals di-
rected by the spotter, if present.
Avoid unstable areas. Stay a safe distance from
edge of dump area.
Position truck on a solid, level surface before
dumping.
As body raises, the truck Center of Gravity (CG) will
move. Truck must be on level surface to prevent
tipping / rolling!
2. Carefully maneuver truck into dump position.
When backing truck into dump position, use only
the foot-operated brake pedal to stop and hold
truck.
3. When in dump position, place transmission range
selector at the ''Neutral'' position, and apply the
Brake Lock switch.
HOIST CONTROL VALVE
1. Hoist Control Lever
2. ''FLOAT''/"HOLD"
Postion
← ARROW Points to Front of Truck
3. ''DOWN'' Position
4. ''RAISE'' Position
5. Center Console
To Raise dump body:
The dumping of very large rocks (10% of payload,
or greater) or sticky material (loads that do not flow
freely from the body) may allow the material to
move too fast and cause the dump body to move
RAPIDLY and SUDDENLY. This sudden movement
may jolt the truck violently and cause possible
injury to the operator, and/or damage to the hoist
cylinders, frame, and/or the dump body hinge pins.
If it is necessary to dump this kind of material, refer
to the CAUTION in the following procedure:
4. Pull the Hoist Control Lever back to the ''RAISE''
position and release lever.
(Releasing the hoist lever anywhere during the
''Hoist Up/RAISE'' operation will place the dump
body in ''HOLD'' at that position.)
5. Raise engine RPM to accelerate hoist speed.
Refer to the CAUTION below.
When body is near the maximum angle, reduce
engine RPM (reduce foot pressure on the accel-
erator pedal) to reduce shock load to the hydrau-
lic system and hoist cylinders.
If dumping very large rocks or sticky material as
decribed in WARNING above, slowly accelerate
engine RPM to raisethe dump body.
When the material starts to move, release hoist
lever to ''HOLD'' position. If the material does not
continue moving and clear the dump body, repeat
this procedure until material has cleared body.
6. When the dump body rises to the desired position,
release the hoist control lever (it will return to the
''HOLD'' position). If desired to raise the body
further, move dump lever again to ''RAISE'' posi-
tion and dump body will rise until hoist cylinders
are fully extended.
(Releasing the hoist lever anywhere during the
''Hoist Up/RAISE'' operation will place the dump
body in ''HOLD'' at that position.)
OM3006.1 04/98
Operating Instructions