Toro 74310 Operator's Manual page 53

Sharpening the Blades
1. Use a file to sharpen the cutting edge at both ends of
the blade (Figure 66).
Note: Maintain the original angle.
Note: The blade retains balance if you remove the
same amount of material from both cutting edges.
Figure 66
1. Sharpen at the original angle
2. Check the balance of the blade by putting it on a blade
balancer (Figure 67).
Note: If the blade stays in a horizontal position, the
blade is balanced and ready to use.
Figure 67
1. Blade
3. If the blade is not balanced, file some metal off the
end of the sail area only.
4. Repeat this procedure until the blade is balanced.
2. Balancer
Installing the Blades
Note: Determine the left and right sides of the machine
from the normal operating position.
Note: Ensure that you install the red-colored blade on the
right side.
1. Install the blade driver to the new blades with the shear
bolts and locknuts
2. Torque the shear bolts to 922 to 1130 N∙m (80 to 100
in-lb).
Note: Align the blade-driver flats with the flats on the
shaft when installing the blade on the mower deck.
3. Install the blade, washer, and blade bolt to the spindle
shaft (Figure 65).
4. Torque the blade bolt to 115 to 149 N∙m (85-110 ft-lb).
5. Lower the mower deck to the operating position.
Refer to Lowering the Mower Deck to the Operating
Position (page 24).
WARNING
Operating a mower deck with loose or
weakened blade bolts can be dangerous. A
loose or weakened blade bolt could allow a
blade rotating at a high speed to come out
from under the mower deck, causing serious
injury or property damage.
• Replace the blade bolt after striking a
foreign object.
• Use only genuine Toro replacement parts.
• Do not lubricate the threads of the bolt or
spindle before assembly.
53
(Figure 65).