Komatsu PC1250-11, Original Instructions Manual

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DO NOT PERFORM THE WORK IF FOREIGN MATERIAL IS ACCUMULATED
AROUND HYDRAULIC CYLINDER
If operation is continued while something sticks between the
hydraulic cylinder and work equipment, the cylinder rod may
bend and break.
Do not perform the work while something sticks between the
hydraulic cylinder and work equipment.
PROHIBITION OF OPERATIONS USING BUCKET DROPPING FORCE
Do not use the dropping force of the machine for digging, nor
use the dropping force of the bucket as a mattock, breaker, or
pile driver. This will drastically reduce the life of the machine.
PROHIBITION OF OPERATIONS USING BUCKET AS LEVER
Do not put the bucket back to a rock and use it as a lever to
dig. This can apply an excessive force to the chassis and buck-
et, and the machine may break.
In this case, dig by using only the force of the arm or bucket. If
an excessive force is applied, the safety valve of the hydraulic
system controls it into a proper range to prevent breakage of
the machine.
MACHINE OPERATIONS AND CONTROLS OPERATION
3-182