Komatsu 830E-AC Shop Manual page 43

4. When the truck is stopped and in dump posi-
tion, apply the brake lock and move the direc-
tional control lever to the NEUTRAL position.
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
RAPIDLY and SUDDENLY. This sudden move-
ment may jolt the truck violently and cause pos-
sible 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,
slowly accelerate engine rpm while raising the
body. When the material starts to move, release
the hoist lever to the HOLD position. If the mate-
rial does not continue moving and clear the body,
repeat this procedure until the material has been
dumped.
5. Pull the lever to the rear (to HOIST position) to
actuate the hoist circuit. (Releasing the lever
anywhere during the raise cycle will hold the
body at that position.)
6. Raise engine rpm to accelerate hoist speed.
7. Reduce the engine rpm as the last stage of the
hoist cylinder begins to extend. Keep engine
speed at 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.
A03030 3/06
Lowering The Dump Body
(When dumping on flat ground):
It is very likely when dumping on flat ground that the
dumped material will build up enough to prevent the
body from lowering. In this case, the truck will have to
be driven forward a short distance (just enough to
clear the material) before the body can be lowered.
NOTE: If dumped material builds
up at the rear of the body and the
body cannot be lowered, then
perform Steps "a" and "b" below:
NOTE: When an attempt to lower the body is
unsuccessful because of material obstruction, raise
the body back up. This will help to prevent the body
from suddenly dropping when pulling away from the
obstruction.
The truck is not to be moved with the dump body
raised except for emergency purposes only. Fail-
ure to lower the body before moving the truck
may cause damage to the hoist cylinders, frame
and/or body hinge pins.
General Safety and Operating Instructions
1. Move the directional control lever to FOR-
WARD, release brake lock, depress Override
button and drive just far enough forward for the
body to clear the material. Stop, move the
directional control lever to NEUTRAL apply the
brake lock.
2. Move the hoist lever forward to the DOWN posi-
tion and release. Releasing the lever places the
hoist control valve in the FLOAT position allow-
ing the body to return to the frame.
a. Move the hoist lever back to the RAISE posi-
tion to fully raise the dump body. Then,
release the hoist lever so it returns to the
HOLD position.
b. Move the directional control lever to FOR-
WARD, release the brake lock, depress the
override button and drive forward to clear the
material. Stop, move the directional control
lever to NEUTRAL, apply the brake lock and
lower the body, again.
3. With the body returned to the frame, move the
directional control lever to FORWARD, release
the brake lock, and carefully leave the dump
area.
A3-29