Sears CRAFTSMAN Manual Del Usario página 23

MAINTENANCE
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
damage. The blade has sharp edges. When you
hold the blade, use gloves or cloth material to pro-
tect your hands.
If you keep the blade sharp and inspect the blade for damage,
the blade will 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, stop the engine. Disconnect the wire to
the spark plug. See if the blade is bent or damaged. Check the
blade adapter for damage. Before you operate the unit, replace
damaged parts with original equipment parts. See a Sears
Service Center in your area. Every three years, have a qualified
service person inspect the blade or replace the old blade with an
original equipment part.
4. Tighten the nut that holds the blade to a torque of 35 foot
pounds.
5. Install the mower housing. See "How To Install The Mower
Housing".
Blade Ada_pter__
Belleville Washer _J
(Outside rim must be
against the blade.) I
Blade
/
Washer
Nut
Figure 20
HOW TO REMOVE AND INSTALL THE BLADE
To Remove
1. Remove the mower housing. See the instructions on "How To
Remove The Mower Housing".
2. As you loosen the nut, use a piece of wood to keep the blade
from rotating.
3. Remove the nut, washers, and blade (Figure 19).
Hi-Lift
Blade
Mandrel
Blade Adapter
Washer
Nut Figure 19
4. Check the blade and the blade adapter according to the
instructions for "Inspect Blade". Replace a badly worn or
damaged blade with an original equipment blade. See a
Sears Service Center in your area.
5. Clean the top and bottom of the mower housing. Remove all
the grass and debris.
To Install
1. Mount the blade and blade adapter on the mandrel
(Figure 19).
2. 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.
3. Fasten the blade with the original washers and nut, Make
sure the outside rim of the Belleville washer is against the
blade (Figure 20).
_ ARNING: Always keep the nut tight that holds the
blade. A loose nut or blade can cause an accident.
MS-3620MA
HOW TO SHARPEN THE BLADE
WARNING: Vibration can be caused if the blade is
_b ot 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 on the blade. A blade that is not sharp will
cause the 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 instructions in "How To
Remove 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 a Sears Service Center in your area.
4. Sharpen the blade with a file (Figure 21). Make sure you
keep the original bevel angle.
5. Make sure the blade is balanced. Use a screwdriver and
hold the blade parallel to the ground (Figure 21). A blade
that is balanced will stay parallel to the ground. If the blade
is not balanced, the heavy end will rotate toward the ground,
Sharpen the heavy end until the blade is balanced.
6. A new blade will cut better than a badly worn blade. Every
three years, have a qualified 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
Remove And install The Blade".
23
Screwdriver/_ !
I Blade is balanced File
I when parallel to the ground, i
Ground Figure 21