Bush Hog GHM 1800 SERIES Operator's Manual page 19

Figure 4-12 Cutter Bar Arrangement and Blade Rotation
9'
MAIN GEARBOX
#1
#2
#3
#4
#5
#6
#7
The blades of adjacent oval discs must be 90° apart from one
another as shown above to ensure proper timing.
MAIN GEARBOX
#1
CW
#2
CW
#3
CCW
#4
CW
#5
CCW
#6
CW
CCW
8'
CW
CCW
CW
CCW
CW
CCW
FORWARD
NOTE
18
7'
MAIN GEARBOX
#1
#2
#3
#4
#5
CW
CW
CCW
CW
CCW