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Assembly and Adjustments
Blade
Shaft Bolt
Bolt Guard
Holder B
Safety Clip
Holder A
Wrench
B
Slip the blade in place
Figure 14
NOTE:
The B450 is shipped with Holder A, the
safety clip, Holder B, shaft bolt, and bolt
guard installed. The shaft bolt is a LEFT-
HAND THREAD AND IS REMOVED IN A
CLOCKWISE ROTATION!
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 14.
2. Remove the shaft bolt, bolt guard and
holder B. See Figure 14.
3. Slide the safety clip off center on the
gearcase shaft. See Figure 14A.
4. Slide the blade over the safety clip
and onto the flange on holder A.
See Figure 14B.
CAUTION!
Install the blade so its printed surface
is visible to the operator when the
brushcutter is in the normal operating
position.
WARNING!
The blade must fit flat against the
holder flange. The blade mounting
hole must be centered over the raised
boss on blade holder A.
A
A
Gearcase
Shaft
B45015
Hex
C
B45017
When installing certain blades, it may be nec-
essary to temporarily remove the safety clip.
Blade
Figure 15
Tighten the assembly
Combination Spark
Plug/Screwdriver
Wrench
Holder "B"
Figure 16
B45016
Slip the safety clip
off-center
Center the safety clip
B45018
NOTE:
B45020
Hex Wrench
5. Lock the blade on the shaft by centering
the safety clip. See Figure 14C.
6. Install holder B on the gearcase shaft.
See Figure 15.
IMPORTANT!
The machined recess in Holder B must
completely surround the safety clip, and
both holders must be flat against the sur-
face of the blade.
7. Lock holder A to the gearcase by insert-
ing the long end of the hex wrench
through both holes as done in step 1
and tighten the shaft bolt securely with
the combination spark plug/screwdriver
wrench. See Figure 16.
8. Remove the hex wrench.
WARNING!
The blade must fit flat against the
holder flange. The blade mounting
hole must be centered over the raised
boss on blade holder A.
Install
Holder "B"
B45019
Bolt Guard
11
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