Shindaiwa 81604 - Manual (Page 13)

1
Gearcase Protector
(P/N 72958-16210)
Nut
Inspect the Gearcase Protector
The metal gearcase protector (p/n 7958-
1610) is installed to protect the gearcase
flange from damage when working close to
sidewalks or other abrasive surfaces, and
should be routinely inspected for damage
or excessive wear.
When replacing the protector, inspect to be
sure that both of the protector mounting
screws are firmly tightened and each screw
is locked in place with a nut as shown.
CAUTION!
The D-shaped shim washer must be
positioned with its flat edge toward the
shaft tube.
D-shaped
Shim Washer
Flat
(toward tube)
Shaft
Tube
Gearcase
26024
Figure 23
Figure 24
50-Hour Maintenance (continued)
135-hour Maintenance
Every 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.
. With a  mm hex wrench remove the 1
muffler cover and  engine cover screws
and the engine cover. See Figure 5.
. With a Phillips type screwdriver remove
the 5 screws holding the spark arrester
screen and cover to the muffler. See
Figure 5.
4. Remove the screen and clean it with a
stiff bristle brush.
5. With a 4 mm hex wrench remove the 
muffler bolts and the muffler.
See Figure 5.
6. Inspect the cylinder exhaust port for any
carbon buildup.
7. Gently tap the muffler on a wood surface
to dislodge any loose carbon.
Engine Cover
Screws
IMPORTANT!
If you note excessive carbon buildup, consult
with an authorized Shindaiwa servicing
dealer.
8. Reassemble the spark arrester, muffler
and engine cover in the reverse order of
disassembly.
Figure 25
Muffler
Cover
Engine
Cover
Muffler
Cover Screw
Spark Arrester
Screen
Muffler
Gasket
Muffler
Spark Arrester
Cover
Gasket
Screws
Muffler
Screws
Outlet