MacDon M100 Unloading And Assembly Instructions page 37

3. Turn adjuster screw (B) clockwise (screw in)
to decrease knife speed, and counter-
clockwise (screw out) to increase the knife
speed.
NOTE
One turn of the adjuster screw will
change the
approximately 116 strokes per minute,
or the wobble box pulley speed by 58
revolutions per minute.
4. Once adjustment has been made re-torque
jam nut (A) as shown.
d. Start engine and recheck knife speed.
Form # 169390
UNLOADING AND ASSEMBLY
knife speed by
35
Model Year - 2010