Komatsu GD555-5 Operation & Maintenance Manual page 176

OPERATION
BLADE OPERATION
BLADE LIFT OPERATION
When left blade lift cylinder control lever (1) is pushed forward
(A), the left end of the blade goes down; when it is pulled back
(C), the left end of the blade goes up.
When right blade lift cylinder control lever (2) is pushed forward
(A), the right end of the blade goes down; when it is pulled back
(C), the right end of the blade goes up.
OPERATION
3 - 123