14
Installing the Blade 
1. Rotate the output shaft bushing until the shaft bushing hole 
aligns with the locking rod slot (Fig. 14). 
2. Insert the locking rod through the locking rod slot and into the 
shaft bushing hole (Fig. 14). 
3. Hold the locking rod in place by grasping the other end against 
the shaft housing (Fig. 15). 
4. While holding the locking rod in place, put the blade on the 
output shaft bushing (Fig. 17). 
5. Place the blade retainer on the output shaft with the flat surface 
against the blade (Fig. 17). 
6. Screw the nut onto the output shaft (Fig. 17). 
7. Tighten the nut counterclockwise with a wrench (Fig. 18): 
• If using a torque wrench, torque to: 325 - 335 in•lb, 27 - 28 
ft.•lb, 37 - 38 N•m. 
• If using a closed-end or socket wrench, turn the nut until the 
blade retainer is snug against the blade. Make sure the blade 
is installed correctly, then rotate the nut an additional 1/4 to 
1/2 turn counterclockwise. 
8. Remove the locking rod.
WARNING:
 To avoid serious personal injury, make sure 
that the pilot hole on the blade is sitting flat against the 
output shaft bushing (Fig. 17). The unit will vibrate and the 
blade may fly off if the blade is not centered.
Fig. 16
Blade Retainer
Nut
Blade
Locking Rod
Fig. 15
Shaft Housing
Nut
Fig. 17
Blade Retainer
Nut
Blade
Output Shaft 
Bushing
Locking Rod
Pilot Hole
Fig. 18
Output Shaft