Craftsman 247.775890 - Manual (Page 13)

the oi! must be to FULL mark on dipstick.
• Change engine oil every 50 hours of operation
under normal operating conditions. Change oil
every 25 hours when operating nder heavy
load or in high temperatures.
To Drain Oil
Drain oil while engine is warm. Follow instructions
given below.
•
Remove oil drain plug. Catch oil in a suitable
container.
• When engine is drained of all oil, replace drain
plug securely.
• Refill with fresh oil. Refer to GAS AND OIL
FILL-UP section on page 9.
• 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
performance. For location of air cleaner, see Figure
14 inset.
To Service Air Cleaner:
Service air cleaner cartridge every 25 hours of
operation or every season, whichever comes earlier.
Service more often if you operate the chipper­
shredder under extremely dusty conditions.
• Remove two hex screws and cover holding the
air cleaner cartridge in place. Remove air
cleaner assembly from inside the cover and
disassemble. See Figure 14.
• Wash pre-cleaner, if so equipped, in liquid
detergent and water. Squeeze dry with a clean
cloth. Saturate in engine oil, then squeeze in
clean, absorbent cloth to remove all of the
excess oil. Replace the pre-cleaner if it is very
dirty or damaged,
• To service cartridge, clean by tapping gently on
a flat surface.
Do not use any oil, petroleum
solvents like kerosene, or pressurized air to
clean cartridge. Replace if the cartridge is very
dirty or damaged.
• Reassemble first the retainer on pre-cleaner
and cartridge and then the cartridge assembly
inside the cover. Insert tabs on cover into slots
in base and tighten the two screws earlier
removed.
Clean Engine
• Clean engine periodically. Remove dirt and
debris with a cloth or brush.
• Frequently remove grass clippings, dirt and
debris from cooling fins, air intake screen and
levers and linkage. This will help ensure
adequate cooling and correct engine speed.
See Figure 15.
Clean here
QJpan here
Figure 15
• 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.
NOTE: Cleaning wfi/ï a forceful spray of water is not
recommended as water could contaminate the fuel
system.
• Remove combustion deposits every 100 hours
of operation. Remove the cylinder head, scrape
and wire brush such deposits from cylinder
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