EN - 27
CHECK CARBON CANISTER
FILTERS
Models 991137, 991138, 991139
See Figure 30.
Clean or replace carbon canister filters
whenever the engine air filter is cleaned or
replaced.
CHECK MOWER BLADES
Check blades for wear. Replace or sharpen
as needed.
Remove Blades
1. Place unit in service position. See
Service Position on page 23.
2. Disconnect spark plug wires.
See Figure 31.
3. Remove hardware retaining blades and
lower spindle guards to spindle and
remove parts. Retain all parts for
reinstallation.
4. Clean all grass, dirt and debris from
upper and lower spindle guards.
Sharpen Blades
1. Remove blades. Discard blades if:
• More than 1.3 cm (1/2") of metal is
removed.
• Air lifts are eroded.
• Blades are bent or broken.
2. File or grind an equal amount of metal
from each cutting edge of the blade until
sharp. DO NOT change angle of cutting
edge or round the corner of the blade.
See Figure 32.
CAUTION: AVOID INJURY. Use
sturdy gloves or padding to
protect hands when working with
mower blades.
Rotation of one blade rotates the
other blades.
Figure 30
1. Carbon Canister Filter
1
1
CAUTION: DO NOT sharpen
blades while attached to unit.
Figure 31
1. Mower Blade
2. Lower Spindle Guard
3. Upper Spindle Guard
1
2
3
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