Sudden Loss Of Engine Power - Komatsu 830E-AC Shop Manual

Lowering The Dump Body
(When dumping over a berm or into a crusher):
1. Move the hoist lever to the DOWN position and
release. Releasing the lever places the hoist
control valve in the FLOAT position allowing the
body to return to the frame.
NOTE: If dumped material builds
up at the rear of the body and the
body cannot be lowered, perform
Steps a & b below:
a. Move the hoist lever back
to the HOIST position to
fully raise the dump body. Release the hoist
lever to return it to the HOLD position.
NOTE: DO NOT drive forward if the tail of the body
will not clear the crusher wall in the fully raised
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, shift the directional control
lever to NEUTRAL, apply the brake lock and
lower the body again.
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.
CAUTION! DO NOT move the truck with the dump
body raised except for emergency purposes
only. Failure to lower the body before moving the
truck may cause damage to the hoist cylinders,
frame and/or body hinge pins.
2. With the body returned to the frame, move the
directional control lever to FORWARD, release
the brake lock, and carefully leave the dump
area.
A3-30

SUDDEN LOSS OF ENGINE POWER

If the engine suddenly stops, there is enough hydrau-
lic pressure stored in the brake and steering accumu-
lators to allow the operation of the steering and brake
functions. However, this oil supply is limited so it is
important to stop the truck as quickly and safely as
possible after the loss of engine power.
If the brake supply pressure drops to a pre-deter-
mined level, the low brake pressure warning light will
illuminate and a buzzer will sound. If the brake pres-
sure continues to decrease, the auto-apply feature
will activate and the service brakes will apply auto-
matically to stop the truck.
Dynamic retarding will not be available! DO NOT
use the service brakes for continuous retarding
purposes.
General Safety and Operating Instructions
1. Bring the truck to a safe stop as quickly as pos-
sible by using the foot pedal to apply the ser-
vice brakes. If possible, safely steer the truck to
the side of the road while braking.
2. As soon as the truck has stopped moving, shift
the directional control lever to PARK. This will
apply the parking brake.
3. Turn the key switch OFF and notify mainte-
nance personnel immediately.
4. If safe to do so, place wheel chocks in front or
behind the wheels so that truck can not roll.
5. If traffic is heavy near the disabled machine,
mark the truck with warning flags during day-
light hours or use flares at night. Adhere to local
regulations.
3/06 A03030