Toro 70089 Operator's Manual page 40

Maintenance
3
Figure 24
1. Blade
2. Blade stiffener
5. Using a file, sharpen cutting edge at both ends of
the blade (Fig. 25).
Figure 25
38
2
1
394
3. Blade bolt and curved
washer
POTENTIAL HAZARD
Worn, eroded or cracked blade can be
dangerous.
WHAT CAN HAPPEN
Blade can fail and cause personal injury to
bystanders.
HOW TO AVOID THE HAZARD
Check blade often
Replace if bent or out of balance
Use genuine Toro replacement blade to
ensure safety and best performance.
NEVER USE A WILL-FIT
REPLACEMENT BLADE.
IMPORTANT: Sharpen top side of the blade
and maintain original cutting angle to ensure
a sharp cutting edge. The blade will remain
balanced if same amount of material is
removed from both cutting edges.
6. Check balance of blade by putting it on a blade
balancer. (An inexpensive balancer can be
purchased at a hardware store.) A balanced blade
will stay in a horizontal position on the balancer.
By contrast, a blade that is not balanced will
settle to the heavy side. If blade is not balanced,
file more material off cutting edge of the blade.
Continue to file and check the blade until it is
balanced.
7. In sequence, install blade, blade stiffener, curved
washer and blade bolt (Fig. 24). The concave
side of the curved washer must point toward the
blade. Tighten blade bolt to 45–60 ft-lb
(61–81 Nm)
IMPORTANT: Make sure cutting edge of
blade is away from mower housing.
8. Reinstall cutting unit: refer to
Removing/Installing Cutting Unit, page 34.