Komatsu PC27R-8 Operation & Maintenance Manual page 76

INSTRUMENTS AND CONTROLS
11 - UPPER STRUCTURE ROTATION LOCKING
LEVER
DANGER
During travel and transport of the machine the rotation
locking lever must be shifted to the lock position; shift the
lever to the lock position after rotating the upper structure
so that it is parallel to the undercarriage.
During travel, make sure that the upper structure is direct-
ed towards the blade; if the upper structure is rotated by
180°, the controls are inverted.
When the lever is in the lock position, it prevents the rotation of
the upper structure.
To release the upper structure from the mechanical constraint,
raise the lever and set it to the unlock position.
IMPORTANT
Do not rotate the upper structure when the lever is in the
lock position.
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