Shindaiwa 81644 Owner's/Operator's Manual page 16

135-hour Maintenance
Ever y 135 hours of operation,
remove and clean the muffler.
WARNING!
Never operate this trimmer
with a damaged or missing muffler or
spark arrester! Operating with missing
or damaged exhaust components is
a fire hazard, and can also damage
your hearing!
1. Remove the spark plug boot.
2. With a 3 mm hex wrench remove the 1
muffler cover and 3 engine cover screws
and the engine cover. See Figure 30.
3. With a Phillips type screwdriver remove
the 5 screws holding the spark arrester
screen and cover to the muffler. See
Figure 30.
4. Remove the screen and clean it with a
stiff bristle brush.
5. With a 4 mm hex wrench remove the 3
muffler bolts and the muffler.
See Figure 30.
6. Inspect the cylinder exhaust port for any
carbon buildup.
7. Gently tap the muffler on a wood surface
to dislodge any loose carbon.
16
Engine Cover
Screws
Figure 30
IMPORTANT!
If you note excessive carbon buildup, consult
with an authorized Shindaiwa servicing
dealer.
Engine
Cover
Muffler
Cover
Cover Screw
Muffler
Gasket
Spark Arrester
Muffler
Screen
Gasket
8. Reassemble the spark arrester, muffler
and engine cover in the reverse order of
disassembly.
Muffler
Muffler
Screws
Screws
Spark Arrester
Outlet
Cover