Simplicity ZT4000 Series - Manual (Page 31)

29
Regular Maintenance
Servicing The Mower Blades
Removing the Mower Blade
1. Wedge a wooden block between the mower blade and
the mower deck housing to keep the mower blade from
turning.
2. To remove the mower blade, use a 15/16” wrench to
remove the mower blade mounting bolt (Figure 25).
Inspecting the Mower Blades
1. Inspect the mower blade (Figures 26 & 27). Discard the
mower blade if it has any of the below conditions.
• Has more than .5” (12,7 mm) of the mower blade
metal removed from previous sharpening or wear (D,
Figure 27).
• The air lifts are excessively eroded (B & C, Figure 27)
and the notch (C) is .25” (6,35 mm) deep or greater.
• Mower blade is bent or broken.
2. If the cutting edges are not sharp or have nicks, sharpen
the blades. See Sharpening the Mower Blades.
Figure 25. Loosening the Mower Blade for Removal
Figure 26. Inspecting the Mower Blade Tips
A. Mower Blade Cutting Edge
B. Square Corner
C. Air Lift
D. Wear Measurement - DISCARD Mower Blade If greater
than .5” (12,7 mm)
B
D
A
B
C
Figure 27. inspecting the Mower Blade Air Lifts
A. New Mower Blade
B. Mower Blade at Wear Limit (A notch begins to form)
C. Mower Blade in Dangerous Condition (Notch measures .25” (6,35 mm) or greater DO NOT USE. Replace with new mower
blade.)
C
A C
A
WARNING
Avoid injury! Mower blades are sharp.
Always wear gloves when handling mower blades or
working near blades.
WARNING
Avoid injury! A worn or damaged blade
can break, and a piece of the mower
blade could be thrown into the operator’s
or bystander’s area, resulting in serious
personnal injury or death.
Inspect the mower blade every 25 hours or atleast once •
a year.
If the mower blade hits a solid object, stop the engine
•
immediately and inspect the mower blades.
Never weld or straighten bent mower blades.
•