Komatsu GD555-5 Operation & Maintenance Manual page 209

OPERATION
ADJUSTING BLADE CUTTING ANGLE
Generally, the operating efficiency is better if the blade cutting
angle is large when cutting hard soil and small when cutting soft
soil.
The blade cutting angle is installed to the power tilt blade, and it can
be freely changed within the range below.
Cutting angle
Minimum: 32º
Maximum: 81º
The power tilt blade can carry out normal blade operation, and also has the following advantages.
It is possible to set to the optimum blade cutting angle to match
the type of soil simply by operating 1 lever.
(A): For hard soil
(B): For soft soil
It is possible to keep the cutting edge sharp for operations, so
this blade can display its power when removing frozen ice during
snow-clearing operations.
(C): Frozen ice
(D): Soft snow
It is possible to change the distance between the cutting edge
and cutting surface, so fine adjustment can be made in the
height of the cutting surface and cutting edge.
When scooping up soil or snow with the low bank posture, the
optimum blade cutting angle is selected, so work can be carried
out efficiently.
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OPERATION