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50-Hour Maintenance
Every 50 hours of operation
(more frequently in dusty or dirty
conditions):
■
Lubricate the gearcase. To
perform this operation, first remove
the gearcase (A) from the outer
tube (B).
C
B
A
Cutter Blade Adjustment
WARNING!
The cutter blades are very sharp!
Always wear gloves when working
around the cutter assembly.
CAUTION!
Operating the trimmer with worn
or improperly adjusted cutters will
reduce cutter performance and may
also damage your machine.
Cutter performance of your machine
depends in great measure on the
cutter blade clearance. Properly ad-
justed blades will oscillate freely yet
help prevent binding of cut material
between blades. Adjust the blades
as follows:
16
CAUTION!
Do not remove the D-shaped shim
washer from the gearcase clamp!
The shim washer prevents damage
from overtightening the gearcase
clamp screw.
1. Loosen the gearcase clamp screw
(C).
2. Remove the index screw (D) from the
gearcase.
3. Slide the gearcase out of the tube.
Using a grease gun, pump lithium-
base grease (about 10 grams) into
the grease fitting (E) on the gearcase
until you see old grease being purged
from the gearcase. Purged grease will
be visible in the outer tube cavity.
D
1. Loosen all the blade locknuts (A) at
least one full turn.
2. Tighten each blade shoulder bolt (B)
firmly, and then loosen the shoulder
bolts 1/4 to 1/2 turn.
3. Working from the gearcase end, lock
each bolt in place by firmly tighten-
ing its locknut while preventing the
shoulder bolt from turning.
When shoulder bolt adjustment is cor-
rect, there should be a gap of 0.25–0.50
mm between the cutter blades and the
flat washers (C) beneath each bolt head
should turn freely.
4. Clean up the excess grease, then reas-
semble the gearcase onto the outer
tube. Make sure the index screw
fits into the hole on the outer tube.
Securely tighten both screws.
B
E
A
C
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