MacDon M155 Operator's Manual page 317

OPERATION
Display and set knife speed "on the go" as follows:
1. Engage header.
2. Press PROGRAM (D) and SELECT (E) on cab display module (CDM) until display (A) shows #### KNIFE SPM.
The displayed value (####) = strokes per minute.
3. Press SLOWER (B) or FASTER (C) until desired knife speed is displayed at (A).
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