Komatsu PC78US-6 Operation & Maintenance Manual page 65

OPERATION
When loading or unloading from a trailer, always travel at low speed. Never operate the travel speed selector switch during the
loading or unloading operation.
If the travel speed is switched between Hi and Lo when the machine is traveling, the machine may deviate to one side, even
when traveling in a straight line.
Stop the machine before switching the travel speed.
REMARK
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DETAILED CONTROLS AND GAUGES
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