Komatsu PC300LC-8 Operation & Maintenance Manual page 215

MACHINE OPERATIONS AND CONTROLS
Swinging or Traveling When Rock Is on Top of Track Assembly
Do not swing the upper structure or travel if there is in the rock on
top of the track assembly. It will contact the undercover or frame
and cause damage. In the worst case, it may cause damage to the
hydraulic equipment and result in a serious breakdown.
During operations, always check that there is no rock, pieces of
rock, or mud on top of the track assembly.
Sudden Lever or Pedal Shifting High Speed Travel
(1) Do not operate the levers and pedals suddenly or take any
other action to move the machine quickly.
(2) Do not operate the levers or pedals suddenly from FORWARD
(A) to REVERSE (B) (or from REVERSE (B) to FORWARD (A)).
(3) Do not operate the levers or pedals suddenly (do not release
them suddenly) to stop the machine when traveling at high
speed.
High-Speed Travel Operations on Rough Ground
Do not travel at high speed on rough ground or rocks. Each time
the machine travels over rough parts of the ground surface, the
thrusting load on the machine will increase and reduce the service
life of the machine.
To protect the machine when traveling on rough ground or on
rocks, there is a cushion structure in the idler (1), so set the idler
facing in the direction of travel and travel at low speed.
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OPERATION