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3
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Figure 23
1. Blade bolt
2. Lock washer
3. Accelerator
Sharpening the Blade
File the top side of the blade to maintain its original
cutting angle (Fig. 24A) and inner cutting edge radius
(Fig. 24B).
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153
Figure 24
1. Sharpen at this angle only
Note: The blade will remain balanced if you remove the
same amount of material from both cutting edges.
Balancing the Blade
1. Check the balance of the blade by placing the center
hole of the blade over a nail or screwdriver shank
clamped horizontally in a vise (Fig. 25).
Figure 25
Note: You can also check the balance using a
commercially manufactured, blade balancer.
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4. Blade
5. Blade driver
2
2. Maintain the original
radius here
1007
2. If either end of the blade rotates downward, file that
end (not the cutting edge or the end near the cutting
edge). The blade is properly balanced when neither
end drops.
Installing the Blade
1. Position the blade onto the spindle and the blade
driver, with the curved blade tips pointing toward the
lawn mower and the blade driver nesting in the recess
of the blade (Fig. 23).
2. Install the accelerator, the lock washer, and the blade
bolt (Fig. 23).
3. Tighten the blade bolt to 50 ft-lb (68 N m).
WARNING
POTENTIAL HAZARD
Operating the lawn mower without the
accelerator in place could cause the blade to
flex, bend, or break.
WHAT CAN HAPPEN
A broken blade could cause serious injury or
death to the operator or bystanders.
HOW TO AVOID THE HAZARD
Do not operate the lawn mower without the
accelerator.
Adjusting the Self-propel Drive
Cable
If the top speed begins to decrease on the lawn mower,
adjust the self-propel drive cable.
1. With the engine turned off, remove the bolt that
secures the belt cover (Fig. 26) and remove the cover.
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2
Figure 26
1. Belt cover
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m-4210
2. Bolt
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