How To Remove And Install The Blade; How To Sharpen The Blade - Craftsman 502.251220 Owner's Manual

CUSTOMER RESPONSIBULOTltES
,9,
INSPECT BLADE
WARNING: Before you inspect or remove the blade,
disconnect the wire to the spark plug. If the blade hits
an object, stop the engine° Check the unit for dam-
age. The blade has sharp edges. When you hold the
blade, use gloves or cloth material to protect your
hands°
If you keep the blade sharp and inspect the bfade for damage, the
blade witi cut better and be more safe to operate. Frequently check
the blade for excessive wear, cracks, or other damage., Frequently
check the nut that holds the blade., Keep the nut tight, if the blade
hits an object, stopthe engine.. Disconnect the wire to the sparkptug_
See if the blade is bent or damaged. Check the blade adapter for
damage. Before you operate the unit, replace damaged parts with
originat equipment parts, See the authorized service center in your
area, Every three years, have an authorized service person inspect
the blade or replace the old blade with an original equipment part
HOW TO REMOVE AND INSTALL THE BLADE
1, Remove the mower housing See the instructions on "How To
Remove The Mower Housing"
2 Use a piece of wood to keep the blade from rotating
3, Remove the nut that holds the blade (Figure 16),
Hi-Ult
Edge Up
Blade
Blade Adapter
Belleville Washer
Washer
Nut Figure 16
4. Check the blade and the blade adapter according to the in-
structions for "Inspect Blade". Replace a badly worn or dam-
aged blade with an original equipment blade., See an
authorized service center in your area.
5, Clean the top and bottom of the mower housing Remoge ailthe
grass and debris,,
6. Mount the blade and blade adapter on the mandrel
(Figure 16)
7, Mount the blade so that the hi-lift edges are up. If the blade
is upside down, the blade will not cut correctly and can cause
an accident.,
8., Fasten the blade with the original washers and nut, Make sure
the outside rim of the Belleville washer is against the blade
(Figure 17),
_I ARNING: Always keep the nut tight that holds the
blade° A loose nut or blade can cause an accident,,
10
Housing",
Blade Adapter _
S
Washer
Belier!tie Washer _ j Nut
(Outside rim must be [.._--"
against the blade.) t
Tighten the nut that holds the blade to a torque of 30 foot
pounds (41,5 N-m),
lnstaH the mower housing., See "How To lnstatl The Mower
Btade
/
Figure 17
HOW TO SHARPEN THE BLADE
WARNING: Vibration can be caused if the blade is
not correctly balanced or if the blade is damaged, A
blade that is damaged with cracks can break and
cause an accident.
Keep a sharp edge an the blade, A bladethat is not sharp will cause
ti_e tips of the grass to become brown.
1 Sharpen the'blade two times a year or every 25 hours
2 Remove the blade according to the instnlctions in "How To Re-
move And install The Blade".
3. Clean the blade with a brush, soap and water., Check the
blade,, Look for cracks, nicks, or other damage, Replace a
badly worn or damaged blade with an original equipment blade
See an authorized service center in your area
4 Sharpen the blade with a file (Figure 18), Make sure you keep
the origin_i bevel angle
5. Make sure the blade is balanced. Use a screwdriver and hold
the blade parallel to the ground (Figure t8). A blade that is
balanced will stay parallel to the ground,. If the blade is not ba!-
anced, the hea W end will rotate toward the ground. Sharpen
the heaw end until the blade is balanced..
6.. A new blade will cut better than a badly worn blade Every three
years, have an authorized service person inspect the blade or
replace the old blade with an original equipment blade
7. Assemble the blade according to the instructions "How To Re-
move And Install The Blade".
Blade
File
Blade is balanced
i
whenparallel to the ground I
Ground
Figure 18
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