Craftsman 247.370253 - Manual (Page 13)

1. GENERAL RECOMMENDATIONS
Refer to Customer Responsibilities Chart for
maintenance schedule.
• Always observe safety rules when performing
any maintenance.
• The warranty on this electric mower does not
cover items that have been subjected to
operator abuse or negligence. To receive full
value from the warranty, operator must maintain
the mower as instructed in this manual.
• Some adjustments will need to be made
periodically to maintain your unit properly.
• All adjustments in the Service & Adjustments
section of this manual should be checked at
least once each season.
• Follow the maintenance schedule on page 12.
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WARNING: Always stop motor and
disconnect the power source before
cleaning, lubricating or performing any
repairs or maintenance on lawn mower.
2. CUTTING BLADE
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WARNING: Always protect hands by
wearing heavy gloves and/or wrapping
cutting edges with newspapers or other
materials when performing any blade
maintenance. Be certain to disconnect the
power supply.
Removing Blade
• Stop the motor and disconnect the power supply
to the mower. Turn mower on its side.
• Use a block of wood between blade and mower
deck to prevent blade from turning when bolt is
removed.
• Using a 9/16” box or open-end wrench, remove
center bolt and bell washer which hold the fan,
blade and adapter to the motor shaft. See figure 12.
• Remove the fan, blade and adapter from the
shaft.
• Remove the two small bolts, bell washers and
nuts which hold the blade to the adapter. See
figure 12. Remove fan from blade adapter.
Replacing Blade
• Put blade adapter on motor shaft.
• Fit blade in adapter making sure that the trailing
edge of the blade is up towards the engine, and
the side of the blade marked “Bottom” (or with
part number) faces the ground when the mower
is in the operating position.
• Before reassembling the blade and the blade
adapter to the unit, lubricate the motor shaft and
the inner surface of the blade adapter with light
oil (or engine oil). Lubricating the bolt holes,
bolts and inner surface of the nuts is also
recommended.
• Assemble bolts, washers, and nuts in the exact
order of removal. Make sure to assemble the fan
properly before running the mower. See figure 12.
WARNING: Periodically inspect the blade
adapter for cracks, especially if you strike a
foreign object. Replace when necessary.
Blade Mounting Torque
The recommended torque for the center blade bolt is
450-600 in. lbs. The recommended torque for the two
blade adapter bolts is 200-300 in. lbs.
To insure safe operation of your unit, all nuts and
bolts must be checked periodically for correct
tightness.
Sharpening blade
• The blade can be sharpened with a file or on a
grinding wheel. Do not attempt to sharpen
while on the mower.
• When sharpening the blade, follow the original
angle of grind as a guide. It is extremely
important that each cutting edge receives an
equal amount of grinding to prevent an
unbalanced blade.
• Test the blade by balancing it on a round shaft
screwdriver or a blade balancer. See figure 13.
NOTE: An unbalanced blade will cause excessive
vibration when rotating at high speeds, may cause
damage to the mower and could break, causing
personal injury.
•
If the blade is not balanced, remove metal from
the heavy side until It balances evenly. We
recommend that the blade be always removed
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