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AH231_09
Powerhead Installation
1. Place the powerhead on a clean, flat
surface, spark plug facing up.
2. Use the 4mm hex wrench to loosen
Tube Clamp
Hex
Wrench
Shim Washer
Connect the Outer Tube to the Powerhead.
the tube clamp screw. Verify that
the D-shaped shim washer is
positioned as shown in Figure 6.
3. Add some moly-type EP grease to
splines at the end of the main shaft.
4. Slide the outer tube into the tube
clamp until the tube bottoms. If
installation is difficult, rotate the
outer tube or main shaft slightly
until you feel the mainshaft splines
engage with the powerhead.
See Figure 5.
5. Position the outer tube so that the
ignition switch is facing up and the
throttle lever is facing down.
See Figure 5.
6. Slide the outer tube into the
powerhead until the throttle grip
just contacts the tube clamp.
7. Tighten the clamp screw firmly.
Figure 6
10
Grip
Spark
Plug
Ignition
Switch
Main
Shaft
Tube
Clamp
Outer Tube
Clamp Screw
Figure 5
Throttle Lever
CAUTION!
Do not force the shaft tube into the
powerhead! Excessive force can
damage the shaft tube and
mainshaft.
CAUTION!
Do not remove the D-shaped shim
washer! The shim washer pre-
vents damage from overtightening
the tube clamp screw.
ASSEMBLY
Cutter performance of your unit
depends in great measure on cutter
blade clearance. Properly adjusted
blades will oscillate freely yet help
prevent binding of cut material
between blades. Adjust blades as
follows (Figure 32):
AH231_38
Guide Bar
Locknut
Cutter Blades
Shoulder
Bolt
Washer
(should turn
freely)
Figure 32
Cutter Blade Adjustment
1. Loosen all blade locknuts at least
one full turn.
2. Tighten each blade shoulder bolt
firmly, and then loosen the shoul-
der bolts 1/4 to 1/2 turn.
3. Working from the gearcase end,
lock each bolt in place by firmly
tightening its locknut while
preventing the shoulder bolt from
turning.
When shoulder bolt adjustment is
correct, there should be a gap of
0.25–0.50 mm between the cutter
blades and the flat washers, and the
flat washer beneath each bolt head
should turn freely.
CAUTION!
Operating the trimmer with worn or
improperly adjusted cutters will
reduce cutter performance and
may also damage your unit.
WARNING!
The cutter blades are very sharp!
Always wear gloves when working
around the cutter assembly.
25
MAINTENANCE