Kubota ZD221-48 Workshop Manual page 61

ZD221 , WSM
i 3GZAAAGOP040B
(7)
1 5 1 /
~-'
- - - ( 6 )
3GZAAAI0PQ45B
-~
3GZAAADOP049C
(10)
G GENERAL
Replacing Mower Blade
A
CAUTION
To avoid personal injury :
• Be sure to stop the engine and remove the key.
• Blade may be sharp. When you handle blades, wear heavy
gloves or wrap end of blade with a rag.
• Checking
The blade cutting edges should be kept sharp at all times.
Sharpen the cutting engines, if they resemble blade (B).
Replace the blades if they appear similar to blade (C).
• Replacing
1. Tilt up the mower deck.
2. Wedge a block of wood between the blade and mower housing
or use a box wrench over the pulley nut to prevent the spindle
from rotating while removing the blade bolts; loosen the blade
bolt and illustrated.
• IMPORTANT
• Use the proper metric size box or socket wrench to tighten
or loosen the blade mounting bolt.
3. To sharpen the blades yourself, clamp the blade securely in a
vise.
Use a large mill file and file along the original bevel until sharp.
4. To check the blade for balance, place a small rod through the
center hole. If the blade is not balanced, file the heavy side of the
blade until balance is achieved.
5. Pass the spline boss through the blade and 2 cup washers, and
tighten the bolt.
• NOTE
• Make sure that the cup washer is not flattened out or worn;
this cause blade to slip excessively.
Replace the 2 cup washers if either is damaged.
6. Before checking or replacing the blade, wipe grass and mud off
the top and inside of the mower. Especially clean up the inside
of the belt cover, because otherwise the belt life will be reduced.
• IMPORTANT
• Tighten the three blade bolts to 98 to 117.6 N'm (10 to 12
kgf'm, 72 to 871bHt) of torque.
• The blade bolts have right hand threads. Turn them
counterclockwise to loosen.
• To prolong the service life of the blades, reposition them as
shown in the figure below periodically.
(1) Wooden Block
(2) Spindle Holder
(3) Spindle Guard
(4) Blade
(5) Lock Washer
(6) Bolt
(7) 2-Cup Washer (Plate Spring)
(8) LH Blade
G-47
(9) Center Blade
(10) RH Blade
(A) New Blade
(B) Worn Blade
(e) Cracked Blade
(0)
"loosen"
(G) 30.2 mm (1.19 in.)
W1035579