Operating Instructions - Section 30 8/11 OM3062
Page 30-20
SUDDEN LOSS OF ENGINE POWER
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 oil pressure warning
light will illuminate and sonalarm 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.
1. Stop the truck as safely and quickly as possible
by using the foot pedal to apply the service
brakes. If possible, 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. Move the directional control lever to PARK as
soon as the truck has stopped moving.
3. Turn the key switch to the OFF position and
notify maintenance personnel immediately.
4. If traffic is heavy near the disabled machine,
mark the truck with warning flags during
daylight hours or use flares at night. Adhere to
local regulations.
FUEL DEPLETION
The high pressure injection (HPI) fuel system uses
fuel to adjust fuel delivery timing by creating a
hydraulic link between the upper plunger and the
timing plunger. Metered fuel is also used for
lubricating the injector plunger and barrel. The
maximum demand for metered fuel is required during
high speed / low load conditions.
Operating the truck to fuel depletion forces the
injector train into a no-follow condition. No fuel
flow between the plungers may cause damage to
the injectors and the overhead due to adhesive
wear, resulting in costly repairs and unnecessary
downtime.
Allowing the Komatsu truck to operate until fuel
depletion can lead to unsafe operating
conditions possibly resulting in an
uncontrollable vehicle and/or personal injury.
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