Komatsu WA380-6 Operation & Maintenance Manual page 199

OPERATION OPERATION
Stock pile
Blasted rock
4. At the same time as thrusting the bucket into the material, raise
the lift arm to prevent the bucket from going in too far. By
raising the lift arm, ample traction will be produced by the front
tires.
REMARK
If the bucket is thrust too much and the lift arm stops rising or the
machine stops moving forward, release the accelerator pedal a
little. Proper operation of the accelerator pedal for each type of the
soil is effective for saving of fuel and prevention of wear of the tires.
5. Check that there is enough material loaded into the bucket,
then operate the bucket control lever to tilt the bucket and load
the bucket fully.
REMARK
If the bucket edge is moved up and down while pushing in the
bucket and digging, the front tires will come off the ground and this
will cause the tires to slip.
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OPERATION OPERATION