Komatsu 830E Shop Manual page 44

SUDDEN LOSS OF ENGINE POWER
NOTE: If the engine suddenly stops, there is enough
hydraulic pressure stored in the brake and steering
accumulators 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-
determined level, the "Low Brake Pressure" warning
light will illuminate and a buzzer will sound. If the
brake pressure continues to decrease, the "Auto-
Apply" feature will activate and the service brakes
will apply automatically to stop the truck. Apply
parking brake as soon as the truck comes to a
complete stop.
1. Bring the truck to a safe stop as quickly as pos-
sible by using the foot pedal to apply the ser-
vice brakes.
Dynamic retarding will not be available! Do not
use the service brakes for continuous retarding
purposes.
2. If possible, steer the truck to the side of the road
while bringing it to a complete stop. Apply the
parking brake as soon as the truck has stopped
moving. Turn key switch "Off" and notify mainte-
nance personnel immediately.
3. If safe to do so, place wheel chocks in front or
behind the wheels to that truck cannot roll.
4. If the truck becomes disabled where traffic is
heavy, mark the truck with warning flags in day-
light or flares at night.
A3-30
RESERVE ENGINE OIL SYSTEM
(Optional)
The reserve oil tank for the engine is designed to add
more oil capacity to the engine and to make less fre-
quent servicing of the engine oil. The circulation of oil
between the engine sump and reserve tank
increases the total volume of working oil. This dilutes
the effects of contamination and loss of additives and
maintains the oil quality over longer periods. A filter
in the supply circuit protects the pumping unit and
prevents transfer of contaminants to the engine
sump which might enter the tank during servicing. It
also gives an added level of oil cleanup.
Operation
Engine oil is circulated between the engine sump and
the reserve tank by two electrically driven pumps
within a single pumping unit (11). The pump unit is
mounted on the side of the reserve tank. The pump
unit is equipped with an LED monitor light on one
side.
Pump 1 (in the pump unit) draws oil from the engine
sump at a preset control point (determined by the
height of the suction tube). Oil above this point is
withdrawn and transferred to the reserve tank (9).
This lowers the level in the engine sump until air is
drawn.
Air reaching the pumping unit activates Pump 2 (in
the pump unit) which returns oil from the reserve tank
and raises the engine sump level until air is no longer
drawn by Pump 1. Pump 2 then turns "Off". The run-
ning level is continuously adjusted at the control point
by alternation between withdrawal and return of oil at
the sump.
LED Monitor Light
General Safety and Operating Instructions
• Steady - Pump 1 is withdrawing oil from the
engine sump and bringing down the oil level.
• Regular Pulsing - Pump 2 is returning oil to the
engine sump and raising the oil level.
• Irregular Pulsing - Oil is on the correct running
level.
A03020