Shindaiwa AH254 - Manual (Page 17)

17
Locknut
Washer (should
turn freely)
Maintenance (continued)
Muffler and spark arrester maintenance
Engine
Cover
Screws
Engine Cover
Muffler
Muffler Gasket
Muffler Bolts
Spark Arrester Screen
Spark Arrester Cover
Cover Screws
With a 3 mm hex wrench remove the 1.
4 engine cover screws and the engine
cover.
If the engine becomes sluggish and low
on power, check and clean the spark
arrester screen.
IMPORTAnT!
If you note excessive carbon buildup,
consult with an authorized servicing
dealer.
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.
With a 4 mm hex wrench, remove the 2.
3 muffler bolts and the muffler.
With a small flat bladed screwdriver
3.
remove the 2 screws holding the
spark arrester screen and cover to
the muffler.
Remove the screen and clean it with a
4.
stiff bristle brush.
Inspect the cylinder exhaust port for
5.
any carbon buildup.
Reassemble the spark arrester, muf-
6.
fler and engine cover in the reverse
order of disassembly.
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:
Loosen all blade locknuts at least 1.
one full turn.
Tighten each blade shoulder bolt
2.
firmly, and then loosen the shoulder
bolts 1/4 to 1/2 turn.
Guide Bar
Cutter
Blades
Shoulder Bolt
Adjusting cutter blades
Cutter blade adjustment
Working from the gearcase end, lock 3.
each bolt in place by firmly tighten-
ing its locknut while preventing the
shoulder bolt from turning.
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. Never
operate the machine with damaged or
worn cutters.
When shoulder bolt adjustment is 4.
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.