MTD 315B - Manual (Page 9)

Clean the engine regularly with a cloth or brush.
Keep the cooling system (blower housing area) clean
to permit proper air circulation which is essential to
engine performance and life. Be certain to remove all
dirt and combustible debris from muffler area.
REMOVING THE FLAIL SCREEN
If the discharge area becomes clogged, remove the
flail screen and clean area as follows.
1. Stop the engine. Make certain the chipper-
vacuum has come to a complete stop. Disconnect
the spark plug wire before unclogging the
discharge chute.
2. Remove the vacuum bag from the unit.
3. Remove the four self-tapping screws from the
bottom of the discharge chute, and the hex bolt,
flat washer and hex nut from the top. Remove the
discharge chute assembly. See figure 13.
Discharge
Chute
Assembly
Hex Bolt
=lat Washer
Hex Nut
Seif-Tapping
Screws
FIGURE 13.
4. Remove the two hex bolts and hex nuts which
extend through the housing. Lift the flail screen
from inside the housing. See figure 14.
5. Clean the screen by scraping or washing with
water. Reinstall the screen.
NOTE: Be certain to reassemble the flail screen with
the curved side down as shown in figure 14.
SHARPENING OR REPLACING CHIPPER BLADES
1. Disconnect the spark plug wire and move away
from the spark plug.
2. Remove the flail screen as instructed in the previ­
ous section.
3. Remove the plastic belt cover on the front of the
engine by removing the two self-tapping screws.
See figure 15.
Belt
Cover
Self-Tapping
Screws
1
1 J 1
FIGURE 15.
4. Remove the access plate by removing two hex
lock nuts. See figure 16.
5. Locate one of the chipper blades in the access
plate opening by rotating the impeller assembly
by hand. Remove the blade using a 3/16" alien
wrench on the outside of the blade and 1/2"
wrench on the impeller assembly, inside the
housing.