Komatsu PC220LC -8 Operation & Maintenance Manual page 239

TRANSPORTATION TRANSPORTATION
8. Raise the work equipment, pull in the arm under the boom,
then move the machine slowly.
9. When the machine is horizontal on top of the rear wheels of the
trailer, stop the machine.
NOTICE
When unloading the machine, always keep the arm and boom at an
angle of 90° - 110°.
If the machine is unloaded with the arm pulled in, it will cause damage
to the machine.
When moving onto the ramps, do not thrust the bucket into the ground.
This will cause damage to the hydraulic cylinders.
10. When moving from the rear of the trailer on to the ramps, set
the angle of the arm and boom to 90° to 110°, lower the bucket
to the ground, then move the machine slowly.
11. When moving down the ramps, operate the boom and arm
slowly to lower the machine carefully until it is completely off
the ramps.
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OPERATION OPERATION