Precautions When Handling Blasted Rock - Komatsu WA500-6H Operation & Maintenance Manual

Operation 3.3 Operation

Precautions when handling blasted rock

If the target load is blasted rock, pay careful attention to the fol-
lowing items when carrying out the operation in order to extend
the service life of the machine.
Operating procedure to prevent damage to machine
Handling bucket
When approaching the facing and lowering the bucket to the
ground, do not drop the bucket suddenly into contact with the
ground. If the bucket is dropped suddenly, the bucket, work
equipment, area around the pins, and the machine frame will be
subjected to excessive shock, and this will lead to damage or
deformation of various parts of the machine.
In addition, the front wheels were come off the ground, so this
will cause the machine to slip.
GK050139
When lowering the bucket to the ground, reduce the lowering
speed of the bucket when it is close to the ground and bring it
slowly into contact with the ground.
Shifting transmission when thrusting bucket in
When thrusting the bucket into the facing to carry out excava-
tion, do not shift down with the accelerator pedal depressed
(with the engine speed raised). If the transmission shifts down
when the engine speed is high, there will be an excessive load
on the engine, torque converter, transmission, axles, final drive,
and the whole power train.
When shifting down to 1st and thrusting the bucket into the fac-
ing, release the accelerator pedal to reduce the engine speed
GK050140
before shifting down. Then gradually depress the accelerator
pedal. If the accelerator is operated suddenly after shifting down,
there will be excessive load brought to bear on the engine and
power train.
Articulating machine during digging operations
Do not carry out operations with the machine articulated. If the
machine is articulated, the direction of force will be different for
the front wheels and rear wheels. As a result, the power when
traveling will not be transmitted fully to the front wheels, so this
will reduce the digging force and bring an excessive load to bear
on the center hinge pin. In addition, even with the front wheels,
the power will not be transmitted uniformly to the left and right
wheels. The load will be brought to bear on one wheel, so this
will reduce the service life of the tire on one side.
GK050141
If digging work is carried out with the machine articulated, the
overall stability of the machine will be poor and there is danger
of the machine tipping over.
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WA500-6H – VEAM430100