Sudden Loss Of Power - Komatsu 730E Shop Manual

7. Turn the key switch to the OFF position to allow
the engine to turn off when the timing sequence
is complete. When the engine stops after the
idle period, the hydraulic bleed-down timer will
be activated and the 24VDC electric circuits will
turn off.
The engine will only shut off if the key switch is in
the OFF position.
NOTE: To cancel the idle timer sequence, move the
timer delay shutdown switch to the OFF (lower)
position. If the key switch is in the OFF position, the
engine will stop. If the key switch is in the ON
position, the engine will continue to run.
8. With the key switch OFF and the engine
stopped, wait at least 90 seconds. Relieve the
steering circuit pressure by turning the steering
wheel back and forth several times. No front
wheel movement will occur when hydraulic
pressure is relieved.
9. Close and lock all windows, remove the key
from the key switch, and lock the cab to prevent
possible unauthorized truck operation. Dis-
mount the truck properly.
A03048

SUDDEN LOSS OF 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.
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.
Dynamic retarding will not be available!
DO NOT use the service brakes for continuous
retarding purposes.
2. As soon as the truck has stopped moving, shift
to NEUTRAL and apply the parking brake.
3. Slowly release the service brakes to check the
capacity of the parking brake. If the parking
brake can not hold the truck stationary, apply
the service brakes and hold them ON. DO NOT
turn the key switch OFF, and DO NOT release
the service brakes.
4. Notify maintenance personnel immediately.
5. If the truck is on level ground, or if the parking
brake can hold the truck stationary and the truck
is in a stable condition, it is then OK to turn the
key switch OFF.
6. If safe to do so, have maintenance personnel
place wheel chocks or other mechanisms in
front or behind the wheels to reduce the risk of
the truck rolling.
7. 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.
General Safety & Operation A3-33