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Assembly
Trimmer Head
Bolt Guard
(not used)
Safety Clip
(not used)
Figure 17
NOTE:
The B450 is shipped with Holder A, the blade
retainer (safety clip), Holder B, shaft bolt,
and bolt guard installed. The shaft bolt is a
LEFT-HAND thread. Remove it by turning
CLOCKWISE!
1. With the gearcase output shaft facing
up, rotate the gearshaft and holder A
until the hole in holder A aligns with the
matching hole in the gearcase flange,
and then lock the holder to the gearcase
by inserting the long end of the hex
wrench through both holes.
See Figure 17.
12
Shaft Bolt
(not used)
Holder B
Holder A
B45021
Gearcase
Shaft
2. Using the combination spark plug/
screwdriver wrench, remove the shaft
bolt, bolt guard, holder B and the safety
clip. (The bolt guard, shaft bolt and
safety clip are not used with a trimmer
head). See Figure 17.
3. Install Holder B on the gearcase shaft.
The splined hole on Holder B must
engage with the gearcase shaft.
4. Using the hex wrench to secure Holder
A , install and hand-tighten the trimmer
head (counter-clockwise to install).
See Figure 18.
Hand-tighten Trimmer Head
(counter-clockwise to install)
Figure 18
5. Remove the hex wrench from the
gearcase and holder.
B45022
Hex Wrench
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