MTD Yard-Man YM320BV Operator's Manual page 16

MAINTENANCE AND REPAIR INSTRUCTIONS
Fig. 20
4. Apply enough clean SAE 30 oil to lightly coat the
filter (Fig. 20).
5. Squeeze the filter to spread and remove excess oil
(Fig. 21).
6. Replace the air filter inside the air filter/muffler cover
(Fig. 18).
NOTE: Operating the unit without the air filter and air
filter/muffler cover assembly will VOID the
warranty.
Reinstalling the Air Filter/Muffler Cover
1. Place the air filter/muffler cover over the back of the
carburetor and muffler. Align the screw holes.
2. Insert the four (4) screws into the holes in the air
filter/muffler cover (Fig. 17) and tighten.
Do not over tighten.
SPARK ARRESTOR MAINTENANCE
NOTE: The exhaust can only flow in one direction: AWAY
from the engine. Pay close attention when
disassembling the muffler so you can put it back
together correctly. Failure to do so will damage
the unit and may cause serious personal injury.
1. Remove air filter/muffler cover. Refer to Removing
the Air Filter/Muffler Cover.
2. Locate the muffler, but do not remove it. Find the two
(2) screws on the bottom of the muffler (Fig. 22).
These two screws hold the Spark Arrestor Hood
Assembly and the spark arrestor screen to the
bottom of the muffler. Remove the two (2) screws
using either a torx #20 or flat blade screwdriver.
3. Using a small flat blade screwdriver, carefully pry up
the spark arrestor screen from the recessed hole,
taking care to notice that the "raised" part of the
spark arrestor screen is inside the recessed hole.
Remove the spark arrestor screen from the muffler.
16
4. Clean the spark arrestor screen with a wire brush.
5. Reinstall the spark arrestor screen by putting the
6. Place the spark arrestor plate on top of the spark
7. Place the spark arrestor hood on top of the spark
Fig. 21
8. Replace the two screws you removed in Step 2 and
9. Reinstall the air filter/muffler cover.
Engine
Spark Arrestor Hood
Assembly Includes:
Spark Arrestor Plate
Spark Arrestor Hood
Replace it if it is damaged, or if you are unable to
clean it thoroughly.
"raised" portion of the screen inside the recessed
hole of the muffler. Make sure that the spark arrestor
screen fits flat against the muffler.
arrestor with the "raised" side up and the opening
facing towards the engine (Fig. 22).
arrestor plate with the "raised" side up and the
opening facing AWAY from the engine (Fig. 22). Verify
that the exhaust will be directed AWAY from the
engine.
tighten them securely.
WARNING:
not tightened securely, it could fall off causing
damage to the unit and possible serious
personal injury.
Muffler
Recessed Hole
Spark Arrestor
Hood
and Screws
Fig. 22
If the exhaust
deflector assembly is
Spark Arrestor
Screen
Spark Arrestor
Plate
Opening
Screws