Cub Cadet 990 - Manual (Page 11)

11
Maintaining
Your Lawn
Mower
WARNING
When removing
the cutting blade
for sharpening or
replacement or
when sliding the belt
around it, protect
your hands with a
pair of heavy gloves
or use a heavy rag to
hold the blade.
Shift Lever Cable
Periodic adjustment of the six speed shift cable may be
necessary due to normal wear on the cable. Adjustment
is needed if all six speeds do not work.
The adjustable cable bracket is located on the left side
of the mower beside the engine. See Figure 13. Start
engine and place shift lever in the sixth speed position.
Stop engine and disconnect spark plug wire and ground it
against engine.
1. Loosen hex nut which secures the adjustable cable
bracket. See Figure 5-3.
2. Push back on the adjustable cable bracket.
3. Tighten hex nut.
Blade Care
WARNING: When removing cutting
blade for sharpening or replacement,
protect your hands with a pair of heavy
gloves or use a heavy rag to hold blade.
1. Disconnect spark plug wire from spark plug. Turn
mower on its side making sure that the air filter and
the carburetor are up.
2. Remove bolt, blade bell support, blade, and blade
adapter from the engine crankshaft. See Figure 5-4.
NOTE: When removing the blade, blade adapter, etc., be
careful not to remove or lose parts above it associated
with the engine pulley.
3. The blade can be sharpened with a file or on a grind-
ing wheel. Do not attempt to sharpen the blade while
it is still on the mower. When sharpening blade, follow
original angle of grind. Grind cutting edges equally to
keep blade balanced.
4. Remove blade from the adapter for testing balance.
Balance the blade on a round shaft screwdriver to
check. Remove metal from the heavy side until it
balances evenly.
WARNING: An unbalanced blade will
cause excessive vibration when rotating
at high speeds. It may cause damage
to mower, and could break causing
personal injury.
5. Lubricate the engine crankshaft and the inner
surface of the blade adapter with light oil. Slide the
blade adapter onto the engine crankshaft. Place the
blade on the adapter such that the side of the blade
marked “Bottom” (or with part number) faces the
ground when the mower is in the operating position.
Make sure that blade is aligned and seated on blade
adapter flanges.
6. Place blade bell support on the blade. Align notches
on the blade bell support with small holes in blade.
Replace hex bolt and tighten hex bolt to torque: 450
in. lbs. min., 600 in. lbs. max.
To ensure safe operation of your mower, periodically
check the blade bolt for correct torque.
Figure -3
Figure -4
An unbalanced blade
will cause excessive
vibration when rotat-
ing at high speeds. It
may cause damage
to mower, and could
break causing per-
sonal injury.
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