Husqvarna DT18 C Operator's Manual page 31

Wear/Rotation/Replacing flail blades
After you have used your dethatcher for some time,
the blades will begin to wear on the striking edge.
When this happens, their dethatching performance
will diminish. A new combing edge may be obtained
by rotating the entire rotor shaft assembly laterally
(end to end). This procedure can be repeated until
the blades reach their wear limit; see illustration.
Rotate the rotor shaft as follows:
IMPORTANT INFORMATION
Only the flail blade rotor shaft can be rotated
to achieve even wear.
Rotating the rotor shaft
1. Allow the engine to cool.
2. Disconnect the spark plug.
3. Remove the belt guard (see illustration).
4. Remove the belt guard and pulley from the
rotor shaft (see illustration).
5. Remove the plastic cap from the opposite end
of the shaft and install it where the pulley was
located.
6. Remove the 4 bearing bolts and allow the rotor
shaft to slide out.
7. Check the shaft, bearing, blade length, blade
safety clips and spacers.
8. Rotate the shaft end for end.
9. Refit the bearing bolts.
10. Refi the pulley and check that it is flush against
the bearing collar.
11. Refit the drive belt.
12. Check the pulley alignment to the engine shaft
pulley. The drive belt should run smoothly in its
track. Adjust as necessary. Tighten the pulleys.
13. Refit the belt guard.
14. Reattach the spark plug cable.
MAINTENANCE
A. New blade
B. Worn blade
C. After rotation
8011-006
8011-027
8011-275
8011-279
English – 29