Komatsu GD555-5 Operation & Maintenance Manual page 188

OPERATION OPERATION
5. Lean the front tire to the right to prevent the tire from rubbing
against the side face of the ditch.
6. Operate the left blade lift cylinder and set the left end of the blade to a digging depth of 50 to 100 mm (2.0 to 3.9
in).
7. Operate the left blade lift cylinder while traveling to set the left end of the blade to the desired digging depth.
8. Align the front left wheel with the bottom of the ditch and dig a
ditch of the desired depth.
First, dig to depth of 50 mm (2.0 in) to determine the line of
the ditch.
The chassis is in an unstable position when digging ditches,
so align the front and rear wheels with the bottom of the ditch
when carrying out such operations.
OPERATION OPERATION
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