Green Thumb 60020 GT Gebruikershandleiding - Pagina 14

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■ Place the new blade on the shaft against the fan assembly.

Make sure it is installed with the curved ends pointing

up toward the mower deck and not down toward the

ground.

■ Replace the blade insulator and spacer, then thread the

blade nut on the shaft and finger tighten.

NOTE: Make certain all parts are replaced in the exact

order in which they were removed.

■ Torque the blade nut down using a torque wrench

(not provided) to ensure the bolt is properly tightened.

The recommended torque for the blade nut is 450-

600 in. lbs.

SHARPENING THE BLADE

See Figure 14.

For best mowing performance, the mower blade must be

kept sharp. A dull blade does not cut grass evenly and over-

loads the motor. Under normal circumstances, sharpening

the blade twice during the mowing season is usually suf-

ficient. However, if your lawn has sandy soil, more frequent

sharpenings may be required.

■ Following the instructions in the Replacing the Cutting

Blade section, remove the mower blade. DO NOT attempt

to sharpen the blade while it is attached to the mower.

WARNING:

When removing, inspect the blade carefully. If blade is

bent or damaged, replace immediately with a new blade.

Failure to replace a bent or damaged blade could cause

an accident resulting in possible serious injury.

■ Using a fine-tooth file or stone, sharpen cutting edges

on both ends of the blade, removing equal amounts of

material from both ends.

BALANCING THE BLADE

See Figure 15.

When sharpening, care should be taken to keep the blade

balanced. An unbalanced blade will cause excessive vibra-

tion when the mower is running. This vibration will eventually

cause

damage to the mower, especially the motor.

To check the blade balance:

■ Clamp a screwdriver horizontally in a vise as shown.

NOTE: If a vise is not available, a straight nail can also

be used.

■ Place the center hole of blade on the screwdriver (or nail)

shank.

■ If blade is balanced, it will remain in a horizontal position.

If either end of the blade drops downward, sharpen the

heavy side until the blade is balanced.

MAINTENANCE

Page 14

FAN ASSEMBLY

SPACER

BLADE INSULATOR

SHAFT

BLADE

BLADE NUT

Fig. 13

Fig. 14

Fig. 15