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Air Filter; Spark Arrestor Screen - Craftsman WEEDWACKER 358.798441 Operator's Manual

21 cc/1.3 cu. in. 2-cycle engine 17" semi-automatic head gas weedwacker

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Table of Contents
CUSTOMER
RESPONSIBILITIES
EVERY
5 HOURS
CLEAN
AIR
FILTER
(Fig. 15)
A dirty air filter decreases the life and performance of the
engine and increases fuel consumption and harmful emis-
sions.
Always clean after 5 tanks of fuel or 5 hours of operation.
Clean more frequently in dusty conditions
• Loosen the screws on the air filter cover enough to
remove the cover from the engine
• Remove air filter from cover
• Squeeze air filter dry and replace in cover
• Re-install the air filter cover, making sure the choke exit
slot is placed over the choke lever
AIR
FILTER
AIR FILTER
(2) SCREWS
Figure 15
EVERY 25 HOURS
CLEAN
AND INSPECT
SPARK ARRESTOR
SCREEN (Fig. 16)
As the unit is used, carbon deposits build up on the muffler
and spark arrestor screen (if installed), and must be
removed to avoid creating a fire hazard or affecting engine
performance
Required cleaning is every 25 hours of operation or annu-
ally, whichever is less..
Replace the spark arrestor screen if breaks occur
CLEANING THE SPARK ARRESTOR SCREEN
• Loosen and remove the 2 muffler guard screws.
• Remove the muffler guard.
• Remove the muffler cover retaining springs.
• Remove muffler
diffuser
and spark arrestor screen
assembly. Notice the orientation
of these parts for
reassembly.
• Clean the spark arrestor screen with a wire brush or
replace if breaks are found in the screen
DRIVE SHAFT LUBRICATION (Fig. 17)
• Loosen the gear box clamp screw and the locating screw
from the gear box.
• Remove the gear box from the tube
• Remove the drive shaft from the tube.
• Check drive shaft for broken wires, twists or kinks, and
replace if damage is found.
o Using a clean cloth, wipe surface of drive shaft thor-
oughly to remove any grease or dirt.
• Apply a uniform coat of lithium base grease to the entire
surface of the drive shaft
• Inject the remaining contents of the grease tube into the
top of the tube_
• Replace drive shaft in the tube
• Re-assemble the gear box to the tube. Tighten screws
securely
LUBRICATE THE DRIVE SHAFT
Figure 17
YEARLY
REPLACE SPARK PLUG (Fig. 18)
The spark plug should be replaced each year to ensure the
engine starts easier and runs better. Spark plug gap
should be .025".
• Twist, then pull off spark plug boot.
• Remove spark plug from cylinder and discard.
• Replace with correct spark plug and re-tighten with spark
plug wrench (10-12 ft lb.)
• Reconnect spark plug boot
• Replace any broken or cracked parts.
• Reinstall diffuser and spark arrestor screen assembly
o Reinstall muffler cover and the two muffler cover retain-
ing springs
• Reinstall muffler guard and the two muffler guard screws
(15-20 ftolbs.)
Figure 16
SPARK PLUG
l
_
sO'ARK PLUG
Figure 18
-15-

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