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Section 4 - ADJUSTMENTS & REPAIR
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
4.1.2. NINJA BLADE WEAR LIMIT
1. Inspect blade frequently for signs of excessive wear
or damage. See Figure 4.2.
FIGURE 4.2
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 & 4.2. 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.
4.1.3. BLADE SHARPENING
1. Disconnect spark plug wire and secure end away
from plug.
IMPORTANT: DO NOT tip machine with carburetor or
spark plug down. Oil from crankcase will saturate the air
filter and cause the engine to be hard to start or not start at
all. If contamination does occur, the air filter will have to be
replaced.
2. Tilt mower up on its rear wheels.
3. Remove blade. See Figure 4.3.
FIGURE 4.3
NEW
BLADE
WEAR LIMIT
(NOTCH STARTS)
DANGEROUS
CONDITION!
DO NOT USE ON
MOWER! REPLACE
WITH NEW BLADE.
NEW BLADE
WEAR LIMIT. CRACKS
OR NOTCHES BEGIN
TO APPEAR ON TIP.
DANGEROUS!
DO NOT USE A BLADE IN
THIS CONDITION!
MAKE SURE THAT
BLADE HUB IS
SEATED BETWEEN
FLANGES
BLADE
HUB
FLANGE
BLADE
CONE WASHER
(Concave Side Up)
CAPSCREW