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[Model: BST23]
Installing Trimmer Head
IMPORTANT: Make sure the trimmer head is
for LEFT-HAND ROTATION (counterclock-
wise) as viewed from the operator’s position,
and that the trimmer head adapter is a female,
M8
x
1.25 left-hand thread.
IMPORTANT: The boss adapter must be,
installed on the splined shaft between the
gearcase and the trimmer head as shown.
1.
Install the boss adapter onto the splined shaft out
of the gearcase.
2.
Align the hole in the boss adapter with the hole in
the gearcase.
3.
Insert the 3.5mm pin into the holes in the boss
adapter and gearcase to lock the splined shaft.
4.
Thread the trimmer head adapter onto the splined
shaft, then tighten the trimmer head firmly by
hand.
[Model: BST23C]
IMPORTANT: Make sure the trimmer head is
for RIGHT-HAND ROTATION (clockwise) as
viewed from the operator’s position, and that
the trimmer head adapter is a female, M8
x
1.25
right-hand thread.
1.
Align the hole in the boss adapter with the guide
slot in the bearing case.
2.
Insert the 3.5 mm pin into the hole and guide slot
in the boss adapter and bearing case to lock the
attaching shaft.
3.
Thread the trimmer head adapter onto the attach-
ing shaft, then tighten the trimmer head firmly by
hand.
CAUTION
POTENTIAL HAZARD
• If the trimmer head is not adequately
tightened, it can come loose from the
Trimmer during use.
WHAT CAN HAPPEN
• This may cause damage to property or
personal injur y.
HOW TO AVOID THE HAZARD
• Make sure the trimmer head is securely
fastened to the splined shaft in the
gearcase.
3.5mm Pin
Mail, M8 left-hand thread
Splined Shaft
Boss Adapter
Trimmer Head Adapter
Trimmer Head
3.5 mm Pin
Bearing Case
Boss Adapter
Attaching Shaft
Trimmer Head
Trimmer Head
Adapter
