Yard-Man 950 series Owner's Manual page 14

Remove the bolt and blade sup port which
holds the blade and adapter to the en gine
crankshaft. Re move the blade and adapter
from the crank shaft.
WARNING: Pe ri odically in spect the
blade adapter for cracks, es pecially if
you strike a for eign ob ject. Re place
when nec es sary.
For best re sults your blade should be sharp.
The blade may be resharpened by re moving it
and ei ther grinding or fil ing the cutting edge
keeping as close to the orig inal bevel as pos -
sible. It is ex tremely im portant that each
cutting edge receives an equal amount of
grinding to prevent an un balanced blade. Im -
proper blade bal ance will re sult in ex cessive
vibration causing even tual damage to the en -
gine and mower. Be sure to care fully bal ance
blade af ter sharp ening. The blade can be
tested for bal ance by bal ancing it on a round
shaft screw driver. Re move metal from the
heavy side un til it bal ances evenly.
Before re assembling the blade and the blade
adapter to the unit, lu bricate the en gine crank-
shaft and the in ner sur face of the blade
adapter with light oil. In stall the blade adapter
on the crankshaft with the "star" away from the
engine. Re fer to Fig ure 18. Place the blade
with the side marked bot tom (or with part
number) fac ing away from the adapter. Align
the blade bell sup port over the blade with the
tabs in the holes of the blade and in sert the
hex bolt. Tighten the hex bolt to the torque
listed be low:
Blade Mounting Torque
Center Bolt 450 in. lb. min., 600 in.lb. max.
To in sure safe op eration of your unit, ALL
nuts and bolts must be checked pe riodically
for cor rect tight ness.
CAUTION: Cutting grass in sandy
soil conditions
wear to the blade.
Blade Adapter
Blade
Figure 18
causes abrasive
Blade Bell
Support
Hex Bolt
After pro longed use, es pecially in sandy soil
conditions, the blade will be come worn and
lose some of the orig inal shape. Cut ting ef fi-
ciently will be re duced and the blade should be
replaced. Re place with an ap proved fac tory re -
placement blade
re sult ing from blade un bal ance con di tion is not
the re spon si bil ity of the man u fac turer.
BELT REMOVAL AND REPLACEMENT
1. Dis connect the spark plug wire and
ground it against the engine.
2. Drain the fuel tank or place a piece of plas -
tic be neath the cap to prevent gasoline
leak age.
3. Tip the mower on its side. Block se curely.
4. Re move the blade and blade adapter as
de scribed previously.
5. Move rear height adjuster to the highest
po si tion. See Fig ure 21.
6. Using a 3/8" socket re move three hex
screws holding the baffle to the deck. See
Fig ure 19.
Hex
Screw
Hex
Screw
Figure 19
Figure 20
7. Pivot baf fle to wards the rear of the mower.
See Fig ure 20.
8. Re move the hex bolt holding the transmis-
sion to the mower hous ing. See Figure
21.
14
only. Pos sible dam age
Hex
Screw
Baffle