Yard-Man 247.371060 Owner's Manual page 12

• Remove the bolt and blade bell support which hold the blade and adapter to the engine crankshaft.
See Figure 11. Remove the blade and the adapter from the crankshaft.
WARNING: Periodically inspect the blade adapter for cracks, especially if you strike a
foreign object. Replace when necessary.
Blade
Adapter _
Blade Bell Support
/
Hex Bolt
Figure t 1
• 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. An
unbalanced blade will cause excessive vibration when rotating at high speeds, may cause damage
to the mower and could break, causing personal injury.
• The blade can be tested by balancing it on a round shaft screwdriver. Remove metal from the
heavy side until it balances evenly. It is recommended that the blade always be removed from the
adapter for the best test of balance.
• 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 (or engine oil). Lubricating the bolt holes, bolts
and inner surface of the nuts is also recommended.
To Reinstall Blade:
• Be sure to install the blade with the side of the blade marked "Bottom" (or with part number) facing
the ground when the mower is in the operating position.
• Be certain the blade is aligned with and seated onto the blade adapter flanges.
• Place blade bell support on blade. Make sure the notches on the blade bell support are aligned with
the small hole in the blade.
• Replace hex bolt.
• Tighten to torque: 450 in. Ibs. rain., 600 in. Ibs. max.
• To ensure safe operation of mower, check all nuts and bolts periodically for correct torque.
Deck Maintenance
• The underside of the mower deck should be cleaned after each use to prevent a buildup of grass
clippings, leaves, dirt or other matter. If this debris is allowed to accumulate, it will invite rust and
corrosion, and may prevent proper mulching.
• The deck may be cleaned by tilting the mower and scraping clean with a suitable tool (make certain
the spark plug wire is disconnected). Do not use high pressure cleaners or water.
Engine Maintenance
• Refer to the separate engine manual for all engine maintenance instructions.
• Maintain ENGINE OIL as instructed in the engine manual.
• Service AIR CLEANER every 25 hours under normal conditions. Clean every few hours under
extremely dusty conditions. Poor engine performance and flooding usually indicates that the air
cleaner should be serviced. To service the air cleaner, refer to the engine manual.
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