Toro 74310 Operator's Manual page 51

Figure 67
1. Sharpen at original angle
2. Check the balance of the blade by putting it on a blade
balancer (Figure 68). If the blade stays in a horizontal
position, the blade is balanced and can be used. If the
blade is not balanced, file some metal off the end of
the sail area only. Repeat this procedure until the blade
is balanced.
Figure 68
1. Blade 2. Balancer
Installing the Blades
Note: Determine the left and right sides of the machine
from the normal operating position.
Note: Ensure the red colored blade is installed on the
right-hand side.
1. Install the blade driver to the new blades with the shear
bolts and locknuts (Figure 66).
2. Torque the shear bolts to 80-100 in-lb (922-1130
N-cm).
Note: The blade-driver flats must be aligned 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 66).
4. Torque the blade bolt to 85-110 ft-lb (115-149 N-m).
5. Lower the mower deck to the operating position.
Refer to Lowering the Mower Deck to the Operating
Position (page 21).
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.
51