Simplicity ZT4000 Series - Manual (Page 32)

30 www.simplicitymfg.com
Regular Maintenance
Figure 30. Tightening the Mower Blade for Installation
A. Mower Blade Mounting Bolt
B. Flat Washer
C. Mower Blade Air Lift (Points Up For Installation)
D. 4 X 4 Wooden Block
Sharpening the Mower Blade
1. Sharpen the mower blades with grinder, hand file, or
electric blade sharpener.
2. Sharpen the mower blade by removing an equal amount
of material from each end of the mower blade.
3. Keep the original bevel (A, Figure 28) when grinding.
DO NOT change the mower blade bevel.
4. The mower blade should have a maximum 1/64” (0,40
mm) cutting edge (B) or less.
5. Balance the mower blades before installing.
Balancing the Mower Blades
1. Clean the mower blade to remove any dried grass or
other debris.
2. See Figure 29. Put the mower blade on a nail in a vise
and turn the mower blade to the horizontal position.
3. Check the balance of the mower blade. If either end of
the mower blade moves downward, sharpen the heavy
end until the mower blade is balanced. See Sharpening
the Mower Blades for proper sharpening instructions.
4. Repeat the process until the mower blade remains in the
horizontal position.
Reinstalling the Mower Blades
1. Wedge a wooden block between the mower blade and
the mower deck housing to keep the mower blade from
turning.
2. Reinstall each mower blade with the air lifts pointing up
towards the mower deck as shown in Figure 30. Secure
with the mower blade mounting bolt and flat washer (A
& B, Figure 30) and torque to 70 ft. lbs (94 Nm).
A
B
Figure 28. Sharpening the Mower Blade
A. Mower Blade Bevel
B. Mower Blade Cutting Edge
Figure 29. Balancing the Mower Blade
A. Nail
A
D
A
B
C
WARNING
Avoid injury! Mower blades are sharp.
Always wear gloves when handling mower blades or •
working near blades.
Always wear safety eye protection when grinding.
•
WARNING
Avoid injury! Keep mower blades
balanced.
An unbalanced mower blade can create excessive vibration
and damage the unit or cause mower blade failure.