Husqvarna W436 Operation Manual - Page 24

Replacing Mower Spindle Bearings

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Blade Sharpening 1. Discard mower blade if: • More than ½" (1.27 cm) of metal is removed. • Air lifts become eroded. • Blade is bent or broken. 2. Sharpen mower blade by removing an equal amount of material from each end of mower blade. DO NOT change angle of cutting edge or round the corner of the mower blade. Incorrect filing profile Replacing Mower Spindle Bearings 1. Turn the engine off. Remove the ignition key. Remove the ignition wire from the spark plugs. 2. Remove mower blade. 3. Remove nut, flat washer, spacer and pulley. 4. Remove spindle shaft, lower bearing and spacer from spindle housing. Discard bearing. 5. Remove and discard upper bearing. 6. Clean entire assembly. 7. Install a new lower bearing and spacer on the spindle shaft. IMPORTANT Avoid damage! The clearance between the lower bearing and the housing is only .002 in (.05 mm). Do not force bearing into housing. Discard blade if more than ½" (1.27 cm) Cutting Edge Air Lift Erosion NOTE: If mower is used under sandy soil conditions, replace blades when air lifts become eroded through at ends. 3. Check mower blade balance. Slide mower blade on an unthreaded bolt. A balanced blade should remain in a horizontal position. If either end of mower blade moves downward, sharpen the heavy end until blade is balanced. 4. Reinstall the blade(s). Replace Mower Blades 1. Reinstall the spacers, blades, and bolts on the spindle shafts. 2. Block blades with a wooden block to prevent blade rotation. 3. Tighten each blade bolt to a torque of 120 lbf-ft (163 N•m). 4. Replace ignition wire on spark plugs. 8. Install the spindle shaft, lower bearing and spacer into the spindle housing. 9. Install the upper bearing. 10. Install spacer. 11. Install pulley and nut. Tighten nut to 85 lbf-ft (115 N•m). 12. Grease the spindle. See General Lubrication. 13. Install mower blade, blade washers and blade bolt assembly. Tighten bolt to 120 lbf-ft (163 N•m). Nut Spacer Grease Fitting Washer Pulley Bearing Retaining Ring Housing Spacer Bearing - 24 - Shaft

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- 24 -
Blade Sharpening
1.
Discard mower blade if:
• More than ½" (1.27 cm) of metal is
removed.
• Air lifts become eroded.
• Blade is bent or broken.
2.
Sharpen mower blade by removing an
equal amount of material from each end
of mower blade. DO NOT change angle
of cutting edge or round the corner of the
mower blade.
3.
Check mower blade balance. Slide mower
blade on an unthreaded bolt. A balanced
blade should remain in a horizontal
position. If either end of mower blade
moves downward, sharpen the heavy end
until blade is balanced.
4.
Reinstall the blade(s).
Replace Mower Blades
1.
Reinstall the spacers, blades, and bolts on
the spindle shafts.
2.
Block blades with a wooden block to
prevent blade rotation.
3.
Tighten each blade bolt to a torque of 120
lbf-ft (163 N•m).
4.
Replace ignition wire on spark plugs.
NOTE: If mower is used under sandy soil
conditions, replace blades when air lifts
become eroded through at ends.
Incorrect filing profile
Discard blade if more than ½" (1.27 cm)
Cutting Edge
Air Lift
Erosion
Replacing Mower Spindle Bearings
1.
Turn the engine off. Remove the ignition
key. Remove the ignition wire from the
spark plugs.
2.
Remove mower blade.
3.
Remove nut, flat washer, spacer and
pulley.
4.
Remove spindle shaft, lower bearing and
spacer from spindle housing. Discard
bearing.
5.
Remove and discard upper bearing.
6.
Clean entire assembly.
7.
Install a new lower bearing and spacer on
the spindle shaft.
IMPORTANT
Avoid damage! The
clearance between the lower bearing and
the housing is only .002 in (.05 mm). Do
not force bearing into housing.
8.
Install the spindle shaft, lower bearing and
spacer into the spindle housing.
9.
Install the upper bearing.
10. Install spacer.
11. Install pulley and nut. Tighten nut to
85 lbf-ft (115 N•m).
12. Grease the spindle. See
General
Lubrication
.
13. Install mower blade, blade washers and
blade bolt assembly. Tighten bolt to 120
lbf-ft (163 N•m).
Shaft
Bearing
Housing
Pulley
Washer
Grease Fitting
Spacer
Bearing
Spacer
Nut
Retaining Ring