Komatsu PC450-8 Operation & Maintenance Manual page 256

TROUBLES AND ACTIONS
PHENOMENA THAT ARE NOT FAILURES
Note that the following phenomena are not failures:
q
When the arm control lever is operated to the IN position and
the work equipment is lowered under no load from a high
position, the arm speed will drop momentarily when the arm
is more or less at the vertical position.
q
When the bucket control lever is operated to the CURL posi-
tion and the work equipment is lowered under no load from a
high position, the bucket speed will drop momentarily when
the bucket teeth are more or less at the horizontal position.
q
The bucket or arm will fluctuate by itself during heavy-duty
digging operations.
q
When starting or stopping the swing, noise will be emitted from the brake valve.
q
When going down a steep slope at low speed, a noise will be emitted from the travel motor brake valve.
TOWING THE MACHINE
Serious injury or death could result if a disabled machine
is towed incorrectly or if there is a mistake in the selection
or inspection of the wire rope.
Always check that the wire rope used for towing has ample
strength for the weight of the machine being towed.
Never use a wire rope which has cut strands (A), reduced
diameter (B), or kinks (C). There is danger that the rope
may break during the towing operation.
Always wear leather gloves when handling wire rope.
Never tow a machine on a slope.
During the towing operation, never stand between the tow-
ing machine and the machine being towed.
Operate the machine slowly and be careful not to apply
any sudden load to the wire rope.
NOTICE
The maximum towing capacity for this machine is 303,030N (30,900 kgf).
Always carry out towing operations within the maximum towing capacity.
3-190
WARNING
OPERATION
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