Kubota ZG222A-AU Operator's Manual page 86

(1) Block
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 bolt through the blade, 2 cup washers and
the lock washer, and tighten the bolt.
A 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.
(A) "LOOSEN"
[RCK48P, RCK54P]
(1) Spindle holder
(2) Spindle guard
(3) Blade
(4) 2-Cup washer
(5) Lock washer
(6) Bolt
A Tighten the bolts of the outer blades from 103 to 118
N-m (76 to 87 lbf-ft) of torque.
A The blade bolts have Right hand threads. Turn them
counterclockwise to loosen.
A To prolong the service life of the blades, reposition
them as shown in the figure below periodically.
(1) LH blade
(2) Center blade
(3) RH blade
PERIODIC SERVICE 69