Craftsman 247.795940 - Manual (Page 11)

To Drain Oil:
• Drain oil while engine is warm.
a. Remove oil drain cap. Refer to figure 10. Catch
oil in a suitable container.
b. When engine is drained of all oil, replace drain
cap securely.
• Refill with fresh oil. Refer to GAS AND OIL FILL­
UP section.
• Replace dipstick.
AIR CLEANER
The air cleaner prevents damaging dirt, dust, etc.,
from entering the carburetor and being forced into the
engine and is important to engine life and per­
formance.
Never run your engine without air cleaner com­
pletely assembled.
To Service Air Cleaner:
Service pre-cleaner after every 25 hours of use, or at
least once a season. Service cartridge every 100 hours
of use, or at least once a season. Sen/ice pre-cleaner
and cartridge more often under dusty conditions.
•
Loosen (do not remove) the two screws which
secure the cover.
• Turn the cover counterclockwise and remove it
from the base.
• Carefully remove pre-cleaner and cartridge.
• Clean the inside of base and cover thoroughly.
• Clean cartridge by tapping gently on a flat surface.
If very dirty, replace cartridge and pre-cleaner or
clean as follows;
Wash in a low or non-sudsing detergent and warm
water solution.
CAUTION: Do not use petroleum
solvents such as kerosene to clean cartridge.
Rinse thoroughly with flowing water from inside out
until water is clear.
Allow cartridge to stand and air dry thoroughly
before using. DO NOT OIL CARTRIDGE OR PRE­
CLEANER. DO NOT USE PRESSURIZED AIR TO
CLEAN OR DRY CARTRIDGE.
• Reassemble cover to engine. Tighten the two
screws securely.
Base
CLEAN ENGINE
Clean engine periodically, Remove dirt and debris
with a cloth or brush. Cleaning with a forceful spray of
water is not recommended as water could contami­
nate the fuel system.
Yearly or every 25 hours, whichever occurs first,
remove the blower housing and clean the areas
shown in figure 15 to avoid overspeeding, overheating
and engine damage, Clean more often if necessary.
A
WARNING: PERIODICALLY CLEAN MUF­
FLER AREA TO REMOVE ALL GRASS,
DIRT AND COMBUSTIBLE DEBRIS.
FIGURE 15.
SPARK PLUG
The spark plug should be cleaned and the gap reset
to .030" at least once a season or every 50 hours of
operation. See figure 16. Spark plug replacement is
recommended at the start of each season. Refer to
engine parts list for correct spark plug type.
NOTE: Do not sandblast spark plug. Spark plug
should be cleaned by scraping or wire brushing and
washing with a commercial solvent.
FIGURE 14.
FIGURE 16.
MUFFLER
Do not operate the chipper-shredder without a muffler
or tamper with the exhaust system. Damaged mufflers
or spark arresters could create a fire hazard. Inspect
periodically, and replace if necessary. If your engine
is equipped with a spark arrester screen assembly,
remove every 50 hours for cleaning and inspection.
Replace if damaged.
11