To Raise Dump Body; To Lower Body - Komatsu 930E-2 Shop Manual

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; DO NOT rely on Wheel Brake Lock to stop
truck; this control is unmodulated and applies
REAR SERVICE BRAKES ONLY.
3. When truck is stopped and in dump position, apply
Wheel Brake Lock and move the Selector Switch
to the "Neutral" position.

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 body to move RAP-
IDLY 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. If it is necessary to
dump this kind of material, refer to the WARNING
in the following procedure:
4. Pull the lever to
the rear to actu-
ate hoist circuit.
(Releasing the
lever anywhere
during "hoist up"
wi ll place the
body in "hold" at
that position.)
5. Raise engine RPM to accelerate hoist speed.
Refer to the WARNING below.
If dumping very large rocks or sticky material as
described in WARNING above, slowly accelerate
engine RPM to raise body. When the material starts
to move, release hoist lever to "HOLD" position. If
material does not continue moving and clear body,
repeat this procedure until material has cleared
body.
A3-28

To Lower Body

NOTE: If dumped material builds
up at the rear of the body and the
body cannot be lowered, perform
steps "a" & "b" below:
NOTE: DO NOT drive forward if the tail of body will not
clear the crusher wall in the fully raised position.
NOTE: Failure to "hoist" the body after making an
unsuccessful attempt at lowering the body may result
in the dump body suddenly lowering after the truck
has pulled ahead of the material that was previously
preventing the body from lowering.
CAUTION! The truck is not to be moved with the
dump body raised except for emergency moves
only. Failure to lower body before moving truck
may cause damage to hoist cylinders, frame
and/or body hinge pins.
General Safety and Operating Instructions
6. Reduce engine RPM as last stage of hoist cylinder
begins to extend and let engine go to low idle as
last stage reaches half-extension.
7. Release hoist lever as last stage of hoist cylinder
reaches full extension.
8. After material being dumped clears body, lower
body to frame.
(When dumping over a berm or into a crusher):
9. Move hoist lever forward to "down" position and
release. Releasing the lever places hoist control
valve in the "float" position allowing the body to
return to frame.
a. Move hoist lever back to the
"hoist" position to fully raise
the dump body. Then re-
lease the hoist lever so it returns to the "hold"
position.
b. Shift Selector Switch to "Forward", release
Brake Lock, depress Override button and drive
forward to clear the material. Stop, shift Selec-
tor Switch to "Neutral", apply Brake Lock and
lower body again.
A03017