Sears 358.356090-3.7/20" - Manual (Page 8)

E. CHAIN TENSION
Correct chain tension is very important;
—a loose chain will wear the bar and itself,
—a loose chain can Jump off the bar while
you are cutting.
—a tight chain can damage the saw and/or
break.
Chain tension is correct when the chain:
—can be iifted about 1/8” from the Guide Bar
at a point near the middle of the bar, and
—will move freely around the bar.
The chain stretches during use, especially
when new. Check tension:
— each time the saw is used
— morefrequently when the chain is new
— as the chain warms up to normal operating tem­
perature ........ .... .....;....................
3. Continue turning the Adjusting Screw until
the tension is correct. -
4. Hold the tip of the Guide Bar up and tighten
the Bar Clamp Nuts with the Scrench.
5. Recheck tension.
• The Bar Clamp Nuts must be slightly loose to
tension the chain correctly.
1. Hold the tip of the Guide Bar up and turn the
Adjusting Screw Just until the chain does not
sag beneath the Guide Bar. Figure 9.
NOTE: Turn screw clockwise to tighten ten-
sidn. Turn screw counterclockwise to loosen
tension.
2 Cheek the tension by lifting the chain from
the Guide Bar at the center of the bar. Figure
10 .
CHAIN CAN BE
LIFTED 1/8" WHEN
TENSION IS
CORRECT.
Figure 10
F. ENCINE FUEL MIXTURE ^ ^
i • Your chain saw is powered by a two-cycle
engine which requres a fuel mixture of regu­
far gasoline and a high quality engine oil spe­
cially made for 2-cycle, air-cooled engines.
The internal design of the 2-cycle engine re­
quires lubricaition of moving parts. Lubrica­
tion is provided when you use the recom­
mended mixture of gasoline and oil,.............
• Gasoline must be clean and not over two
months old. After a short period of time,
gasoline begins to chemically break down
and will form compounds that can cause hard
starting and damage in 2-cycle engines.
; • The correct measure of gasoline to oil is very
important.
; —Too much oil in the mixture will foul the
.........spark plug. ..........
—Too little oil will cause the engine to over­
heat resulting in damage.
« Mix the fuel thoroughly in a container since
gasoline and oil do not readily combine. Do not
try to mix fuel directly in the fuel tank.
1. USE THE FOLLOWING FUEL MIXTURES:
1 gallon
REGULAR
GASOLINE
+
t/2
PINT
SEARS #71-36555
16:1
engine oil
^Ny good GRADE
16:1
AJR-COOLED. 2- cycle
_^GINEOlL
2. DO NOT USE:
• BIA Oil (Boating Institute of America)
—•Does not have proper additives tor air­
cooled, 2-cycle engines and could cause
damage.
......... ......
• AUTOMOTIVE OIL—
— Does hot have proper additives for 2-cycle
engines and could cause damage.
• GASOLINE CONTAINING ALCOHOL—
(High Test, Premium or Gasohol)
—Stiffens critical carburetor fuel metering ele­
ments and causes engine damage from
overheating.
— increases vaporlock.
—Attracts water causing corrosion damage.