Craftsman 247.79452 - Manual (Page 14)

However, normal wear will occur. Periodically adjust
the bolts on the side of the wedge plate as follows to
eliminate excess space between the wedge plate and
the beam.
•
Loosen the lock nuts on the two adjustment
bolts on the side of the gib plate, located
beneath the splitting wedge. See Figure 13.
Turn the adjustment bolts in until snug, then
back them off slowly until the wedge assembly
will slide on the beam.
• Tighten the lock nuts securely against the gib
plate to hold the adjustment bolts in this position.
Figure 13
Periodically remove and replace the “gibs” (spacers)
between the wedge plate and the back plate as
follows.
NOTE: If desired, the gibs m aybe rotated and/or
turned over for even wear.
• Remove the center bolt on top of the wedge
plate. Slide the gib plate out. See Figure 13.
• Remove and replace the gibs. Reassemble the
gib plate, making certain flat washer is in place
above the gib plate.
• Readjust the bolts on the side of the wedge
plate as instructed previously.
Engine Maintenance
Changing engine oil
• Only use high quality detergent oil rated with
API service classification SF, SG or SH. Select
the oil's viscosity grade according to the
expected operating temperature. Referto
page 10 of this manual for viscosity chart.
• Stop engine and wait several minutes before
checking oil level. With engine on level ground,
the oil must be to FULL mark on dipstick.
• Change engine oil after the first five hours of
operation, and every 50 hours thereafter.
Change oil every 25 hours of operation if the
engine is operated under heavy load, or in high
ambient temperatures.
To drain oil
Drain oil while engine is warm. Follow the instructions
given below.
• Remove oil drain plug and dipstick. Catch oil in a
suitabie container.
• When engine is drained of all oil, replace drain
plug securely.
• Refill with fresh oil. Refer to GAS AND OIL FILL­
UP section of this manual.
• 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. The air cleaner consists of a pre­
cleaner or foam filter, and a paper filter.
Never run the engine without air cleaner completely
assembled.
1. Service pre-cleaner after every 25 hours of use,
or at least once a season.
2. Sen/ice filter every 100 hours of use, or at least
once a season.
3. Service pre-deaner and filter more often under
dusty conditions.
• Remove wing nut and cover.
• Slide pre-cieaner off filter. Clean the inside of
base and cover thoroughly,
• Clean pre-cleaner as follows: (See Figure 14.)
a. Wash in water and detergent solution, and
squeeze (do not twist) until all dirt is
removed.
b. Rinse thoroughly in clear water. Wrap in a
clean cloth and squeeze (do not twist) until
completely dry, or allow it to air dry.
c. Saturate with eng i ne oil and squeeze (don’t
twist) to distribute oil and remove excess oil.
Foam Filter
_ Paper Filter
Base
Figure 14
NOTE: If the pre-cleaner is torn or dam aged in any
w ay, replace it.
• if necessary, replace paper filter (do not attempt
to clean). Install new filter on base.
• Slide pre-cleaner over filter.
• Install cover and wing nut.
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