Cutter Blade Adjustment - Shindaiwa AH254 Owner's/Operator's Manual

Maintenance (continued)

Cutter blade adjustment

wARnInG!
The cutter blades are
very sharp! Always wear gloves
when working around the cutter
assembly.
Cutting performance of your machine
depends a great deal on proper cut-
ter blade adjustment. Properly adjusted
blades will oscillate freely yet help pre-
vent binding of cut material between
blades. Adjust blades as follows:
1. Loosen all blade locknuts at least
one full turn.
2. Tighten each blade shoulder bolt
firmly, and then loosen the shoulder
bolts 1/4 to 1/2 turn.
Muffler and spark arrester maintenance
If the engine becomes sluggish and low
on power, check and clean the spark
arrester screen.
wARnInG!
Never operate the unit with a
damaged or missing muffler or spark
arrester! Operating with a missing
or damaged spark arrester is a fire
hazard and could also damage your
hearing.
1. Remove the engine cover.
2. Remove the muffler.
3. Remove the the spark arrester screen
and cover.
4. Clean the screen with a stiff bristle
brush.
5. Inspect the cylinder exhaust port for
any carbon buildup.
6. Reassemble parts in the reverse
order.
IMPORTAnT!
If you note excessive carbon buildup,
consult with an authorized servicing
dealer.
3. Working from the gearcase end, lock
each bolt in place by firmly tighten-
ing its locknut while preventing the
shoulder bolt from turning.
CAUTIOn!
Operating the trimmer with worn
or improperly adjusted cutters will
reduce cutter performance and may
also damage your machine. Never
operate the machine with damaged or
worn cutters.
4. 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.
Engine
Cover
Screws
Guide Bar
Cutter
Blades
Shoulder Bolt
Adjusting cutter blades
Engine Cover
Muffler
Muffler Gasket
Spark Arrester Screen
Spark Arrester Cover
Cover Screws
Locknut
Washer (should
turn freely)
Muffler Bolts
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