Komatsu PW98MR-10 Operation & Maintenance Manual page 251

OPERATION MACHINE OPERATIONS AND CONTROLS
When the condition of the machine is as shown in the figure
(angle between "bucket cylinder and link" and "arm cylinder
and arm" is 90 deg.), the maximum excavation force is ob-
tained from the pushing force of each cylinder.
When excavating, you can optimize your working efficiency by
using this angle effectively.
The range for excavating with the arm is from a 45 deg. angle
away from the machine to a 30 deg. angle towards the ma-
chine.
There may be some differences depending on the excavation
depth, but try to stay within the above range rather than operat-
ing the cylinder to the end of its stroke.
SHOVEL WORK
A shovel is suitable for excavating at a position higher than the
machine.
Shovel work is performed by attaching the bucket in the re-
verse direction.
DITCHING WORK
Ditching work can be performed efficiently by attaching a buck-
et which matches the digging operation and then setting the
wheels parallel to the line of the ditch to be excavated.
To excavate a wide ditch, first dig both sides and then finally re-
move the center portion.
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