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Section 4 - REPAIR & ADJUSTMENTS
WARNING
DO NOT attempt any maintenance, adjustments or
service with engine and blade running. STOP
engine and blade. Disconnect spark plug wire and
secure away from spark plug. Engine and
components are HOT. Avoid serious burns, allow
sufficient time for all components to cool. Wear
heavy leather gloves when handling or working
around cutting blades. Blades are extremely sharp
and can cause severe injury.
4.1 MOWER BLADE REPLACEMENT
4.1.1. STANDARD BLADE WEAR LIMIT
1. Inspect blade frequently for signs of excessive
wear or damage. See Figure 4.1.
FIGURE 4.1
2. Replace the blade if it is badly chipped, bent,
noticeably out of balance or has cracks or notch in
either tip. See Figure 4.1. Replace with new blade.
WARNING
DO NOT use a cutting blade that shows signs of
excessive wear or damage. Refer to Section
“MOWER BLADE REPLACEMENT” for proper blade
inspection and service procedures.
4.1.2. BLADE SHARPENING
1. Disconnect spark plug wire and secure end
away from plug.
2. Tilt mower up on its rear wheels. Do not tilt
mower with spark plug or carburetor down.
3. Remove blade. See Figure 4.2.
FIGURE 4.2
4. Sharpen blade on a grinding wheel at an angle
of 22 to 28 degrees. DO NOT sharpen blade
beyond original cutting edge. See Figure 4.3.
FIGURE 4.3
5. Check blade for balance. If necessary, correct
balance by grinding heavy end of blade.
6. Reinstall blade. See Figure 4.1. Check torque
of blade retaining cap screw. Recommended
torque should be 30 to 40 ft. lbs.
NEW BLADE
WEAR LIMIT
(NOTCH STARTS)
DANGEROUS
CONDITION !
DO NOT USE ON
MOWER !
REPLACE WITH NEW
BLADE.
BLADE
HUB
MAKE SURE THAT
BLADE HUB IS
SEATED
BETWEEN
FLANGES
FLANGE
BLADE
CONE WASHER
(Concave Side Up)
CAPSCREW
DO NOT SHARPEN
BEYOND ORIGINAL
CUTTING EDGE
22-28º
BLADE TIP
END VIEW OF
BLADE ASSEMBLY
ORIGINAL CUTTING EDGE