Dumping; Raising The Dump Body - Komatsu 930E-4SE Operation & Maintenance Manual

Operating Instructions - Section 30
Page 30-14

DUMPING

Raising The Dump Body

1. Pull into the dump area with extreme caution.
Make sure the area is clear of persons and
obstructions, including overhead utility lines.
Obey signals directed by the spotter, if present.
2. Avoid unstable areas. Stay a safe distance from
the edge of the dump area.
To prevent tipping or rolling, position the truck
on a solid, level surface before dumping. As the
body raises, the truck center of gravity will move.
3. Carefully maneuver the truck into the dump
position. When backing the truck into the dump
position, use only the foot-operated brake pedal
to stop and hold the truck. Do not rely on the
wheel brake lock to stop the truck. This control
is not modulated and applies the rear service
brakes only.
4. When the truck is stopped and in the dump
position, apply the brake lock and move the
directional control lever to NEUTRAL.
Dumping 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 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 body hinge pins.
5. Pull the lever to the rear to actuate the hoist
circuit. Releasing the lever anywhere during
"hoist up" will hold the body at that position.
6. Raise the engine rpm to accelerate the hoist
speed. If dumping very large rocks or sticky
material as described in the WARNING above,
slowly accelerate the engine to raise the body.
When the material starts to move, release the
hoist lever to the HOLD position. If the material
does not continue moving and clear the body,
repeat this procedure until the material has
cleared the body.
7. Reduce the engine rpm as the last stage of the
hoist cylinder begins to extend. Let the engine
go to low idle as the last stage reaches half-
extension.
8. Release the hoist lever as the last stage of the
hoist cylinder reaches full extension.
9. After the material being dumped clears the
body, lower the body to the frame.
NOTE: If the directional control lever is in REVERSE
when the dump body is raised, reverse propel is
inhibited. To deactivate, lower the dump body and
move the directional control lever out of REVERSE.
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