Craftsman WEEDWACKER 316.74087 Series Operator's Manual page 20

MAINTAINING THE AIR FILTER
Failure to maintain the air filter can result in poor performance or
can cause permanent damage to the engine. Engine failure due to
improper air filter maintenance is not covered by the product warranty.
Cleaning the Air Filter
1. Turn the cover screw counterclockwise to loosen the air filter
cover (Fig. 31).
2. Slide the air filter cover off of the air filter housing (Fig. 31).
3. Remove the sound filter and media filter from the air filter
housing (Fig. 32).
4. Gently hand wash the sound filter and media filter in detergent
and water. Rinse the filters thoroughly and allow them to dry.
5. Lightly coat the sound filter with clean SAE 30 oil. DO NOT
apply oil to the media filter. Squeeze the sound filter to spread
and remove excess oil.
6. Squeeze the sound filter and insert it into the space between the
two ram horn openings (Fig. 32). Make sure the sound filter is
pushed all the way in so that it completely covers both openings
(Fig. 31).
7. Insert the media filter into the media filter slot (Fig. 32). Make
sure the media filter lays flat against the bottom of the air filter
housing (Fig. 31).
8. Slide the air filter cover onto the air filter housing.
NOTE: Operating the unit without the sound filter, media filter and
air filter cover will VOID the warranty.
9. Make sure that the media filter completely covers the air
openings (Fig. 33). If necessary, remove the air filter cover and
adjust the media filter.
10. Turn the cover screw clockwise to secure the air filter cover. To
avoid stripping the screw, DO NOT over tighten the cover screw.
Air Filter
Cover
Cover
Screw
Media Filter
Sound Filter
Media Filter
20
Air Filter
Housing
Fig. 31
Ram Horn Openings
Media Filter Slot
Fig. 32
Air Openings
Fig. 33