Sears 247.37033 - Manual (Page 13)

SERVICE & ADJUSTMENTS
BLADE CARE
A
Periodically inspect the blade adapter for cracks,
especially if you strike a foreign object. Replace when
necessary.
WARNING: When removing the cutting
blade for sharpening or replacement,
protect hands by using heavy gloves or a
rag to grasp the cutting blade.
• Disconnect spark plug wire from spark plug.
• Turn mower on its side making sure that the air
filter and the carburetor are up.
• Use a block of wood between blade and mower
deck to prevent blade from turning when bolt is
removed. Protect your hands with gloves and/
or wrap blade with heavy cloth.
To Remove Blade
• Remove the bolt and blade bell support which
hold the blade and adapter to the engine
crankshaft. See Figure 12.
• Remove the blade and adapter from the
crankshaft.
To Replace Blade:
• Before reinstalling the blade and the blade
adapter to the unit, lubricate the engine
crankshaft and the inner surface of the blade
adapter with light oil.
• Install the blade adapter, the blade and the bell
support on the crankshaft as shown in Figure 12.
Check and make sure to align the tabs in the
holes of the blade with the hole in the bell
support. See Figure 12.
Check and make sure that the side of the blade
marked “bottom” (with part number )faces away
from the adapter.
• Insert the hex bolt through the blade assembly.
Figure 12 shows the correct order of assembly.
• Use block of wood to hold blade again while
you tighten the bolt clockwise. Follow the
recommended torque for the bolt which is 450-
600 in.-lbs.
IMPORTANT: The bolt, used to secure the blade to
the engine, is specially heat-treated. Do not
substitute. To order replacement bolt, refer to the
Repair Parts section of this manual.
WARNING: To ensure safe operation of
your unit, all nuts and bolts must be
checked periodically for correct tightness.
A
To Sharpen Blade:
The blade can be sharpened with a file or on a grinding
wheel. Do not attempt to sharpen while on the mower.
® Follow the original angle of grind as a guide.
Make sure that each cutting edge receives an
equal amount of grinding to prevent an
unbalanced blade.
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.
• Test the blade by balancing it on a round shaft
screwdriver or a blade balancer. See Figure 13.
® If the blade is not balanced, remove metal from
the heavy side until it balances evenly.
1. Insert screw driver through hole
^ s.
67
2. Blade should be parallel to ground
Screw
Driver \
3^
Biade
o '1») o
Ground
Figure 13
15