Maintenance; Carburetor Adjustment; Engine Lubrication - Craftsman 247.796890 Owner's Manual

ADJUSTMENTS
CARBURETOR ADJUSTMENT
If any adjustments are made to the engine
while the engine if running {eg. car-
buretor), keep clear of all moving parts
Be careful of heated surfaces and muffler
Minor carburetor adjustment may be required to com-
pensate for differences in fuel, temperature, altitude or
toad
NOTE
Test the engine by operating the chipper-shredder.
If engine tends to stall or die out, it dsually
indicates that the mixture is slightly lean and it may
be necessary to open ,f',) the needle valve slightly
to provide a richer mixture This richer
mixture may cause a slight unevenness in idling.
L
FIGURE 16.
Idle Speed
Adjusting Screw
Needle Valve
Throttle
Stop
i
Throttle
A DIRTY AIR CLEANER WILL CAUSE
ENGINE TO RUN ROUGH BE CERTAIN
AIR CLEANER IS CLEAN AND ATTACH-
ED TO THE CARBURETOR BEFORE
ADJUSTING CARBURETOR DO NOT
MAKE UNNECESSARY ADJUSTMENTS
FACTORY SETTINGS ARE SATISFAC-
TORY FOR MOST APPLICATIONS AND
CONDITIONS.
Never attempt to change maximum engine speed It is
pre-set at the factory and should be changed only by
a qualified service technician who has the necessary
equipment,
The carburetor may need re-adjusting if engine lacks
power or does not idle properly if adjustments are
needed, proceed as follows.
To Adjust Carburetor:
1. Close needle valve (See figure 16) clockwise
(("_ } finger tight only Forcing may cause damage_
Then open 1-!/2 turns counterclockwise (r'x)
2. Start engine and allow to warm for five minutes.
3
With throttle in RUN position, close needle valve
clockwise (;-_,) until engine starts to lose speed
(lean mixture). Then slowly open needle valve
counterclockwise (f'_) until engine JUST BEGINS
to run unevenly This mixture should be rich enough
for best performance under load.
Place throttle control in IDLE position:
a_ If engine idtes, no further adjustment is
necessary.
b tf engine idles too fast, turn idle speed
adiusting screw counterclockwise _(-",) until
slower speed is obtained
c If engine dies, turn idle speed adjusting screw
1f4 turn clockwise ((-'_) Place throttle
control in FAST position and restart engine
d Move throttle control to IDLE position If
engine does not idle, repeat step c
MAINTENANCE
Disconnect spark plug wire and ground
it against the engine before performing
any repairs or maintenance.
ENGINE LUBRICATION
Your four cycie engine will normally consume some oil;
therefore check engine oil level regularly - approximately,
every five hours of operation and before each usage
Stop engine and wait several minutes before checking
oil level. With engine level, the oil must be even with
the oil fill (refer to figure 7) Change engine oil after the
first two hours of operation, and every twenty, five
hours thereafter
I_ Drain oil while engine is warm
a. Remove oil drain plug Refer to figure 7
b. Tip the chipper-shredder forward, and catch oil
in a suitable container
c. When engine is drained of all oil, replace drain
plug securely.
2 Refif] with fresh oi! Above 32 °, use oil labeled
SAE 3OW or !0W30 Below 32 °, use oil labeled
5W20 Capacity is 1-1i4 pints Refer to "Gas and
Oil FilFUp" on page 6
3. Replace oil fill plug