Ryobi ZR51950A - Manual (Page 15)

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Converting From Trimmer To Brushcutter
Model No. ZR51990A
To convert from the trimmer to the brushcutter, remove the
trimmer head assembly, remove the grass deflector, attach
the brushcutter guard, and install the blade.
To Remove the Trimmer Head Assembly and Grass
Deflector
See Figures 10 and 11.
Follow these steps to remove the trimmer head assembly
and grass deflector.
1.
Align the slot in the flanged washer with the slot in the
gear head.
2. Insert the head locking tool through the flanged washer
and gear head.
3. Remove the drive shaft and trimmer head assembly by
turning the drive shaft clockwise (left-handed threads).
4. Remove the flanged washer and retain it for the blade
installation.
5. Remove the screw securing the grass deflector.
6. Remove the grass deflector.
Note: Store the trimmer head assembly parts together
for future use.
To Attach the Brushcutter Guard
See Figure 12.
Note:
To protect the operator, always be sure to attach the
brushcutter guard.
Follow these steps to attach the brushcutter guard.
1.
Place the guard onto the gear head as shown.
2. Insert the three hex head screws from the bottom
through the guard into the gear head.
3. Tighten the screws securely and torque to 40-50 in.lb.
To Install the Blade
See Figure 13.
Follow these steps to install the blade.
1.
Place flanged washer over the gear shaft with the
hollow side toward the brushcutter guard.
2. Center the blade on the flanged washer, making sure the
blade fits flat and the raised hub goes through the hole
in the blade.
3. Install the cupped washer with the raised center away
from the blade.
4. Place the blade nut onto the gear shaft.
5. Insert the head locking tool through the flanged washer
and gear head.
6. Install the blade nut by turning it counterclockwise
(left-handed threads).
7. Tighten the blade nut and torque to 120 in.lb. minimum
(finger tight plus 1/2 turn).
Figure 10
Figure 11
Figure 12
Figure 13
Assembly
Head
Locking
Tool
Gear
Head
Trimmer
Head
Assembly
Drive
Shaft
Flanged
Washer
Straight Shaft
Grass Deflector
Slot
Gear Head
Brushcutter
Guard
Hex Head
Screw
Brushcutter
Guard
Flanged
Washer Blade
Blade Nut
Cupped
Washer
Gear Shaft