Forest King 20120, Manual

2) Remove the clutch cover.
(Figure 3)

3) Slide the guide bar on the bar
bolts until the guide bar rests against
the clutch drum sprocket. (Figure 4)

4) Hold the chain with the drive links
as shown. The drive links should be
facing inward with the cutters facing
to the right, or direction of rotation.
(Figure 5)

5) Fit the drive links in the clutch
drum sprocket. (Figure 6)

Figure 6

6) Place the chain drive links into the
bar groove.

7) Pull the guide bar forward to
make sure all of the drive links are in
the bar groove.

8) Reinstall the clutch cover. (Figure
3) Make sure the adjusting pin is
aligned with the hole in the guide
bar.

CAUTION: Make sure the 
adjustment pin aligns with the hole. 
Failure to align the pin and install the 
cover properly may result in 
damage, possibly permanent, to 
your saw.

ADJUSTING CHAIN TENSION

Before adjusting, make sure the bar 
knobs are loosened 1 ½ - 2 turns. 
Adjusting the chain tension with the 
knobs tight can cause damage.

Checking the Chain Tension

Check the chain tension by using a 
screwdriver to move the chain along 
the bar. If it does not rotate, it is too 
tight. If it sags below the bar, it is too 
loose.

Adjusting the Chain Tension

The chain stretches slightly during 
each use, especially the first few 
times the saw is used. Always check 
the chain tension each time the saw 
is used and refueled.

1) Make sure the bar knobs are
loosened 1-1/2 – 2 turns.

2) Using a screwdriver, adjust the
tension of the chain. The adjusting
pin is located right below the two bar
knobs.

4

3) Turn the screw to the right to
increase the tension and turn it to
the left to release tension.

4) Using a screwdriver, move the
chain around on the guide bar to
make sure all of the links are in the
bar groove. If the chain does not
rotate, it is too tight and the
adjuster needs to be loosened.

5) Tighten the bar knob securely
after the tension is adjusted.

FUELING AND LUBRICATION

Use regular grade unleaded 
gasoline mixed with 40:1 2-cycle 
engine oil. Do not use a fuel 
mixture that has been stored for 
more than 90 days.

The bar and chain require constant 
lubrication in order to function 
properly. Lubrication is provided by 
the oiler system. Lack of oil will 
cause damage to the bar and 
chain. Smoke coming from the 
chain and discoloration on the bar 
are signs the oil is low.

Fueling Safety Instructions

1) Do not smoke while fueling or
operating the saw.

2) Do not allow sparks or flame in
the area where the fuel is poured or
mixed. Always allow the engine to
cool before refueling.

3) When refueling, turn the engine
off and let it fuel in a non-
combustible area. Slowly remove
the fuel cap and refuel the saw.

4) Mix and pour the fuel in a well-
ventilated outdoor area. Store the
fuel in a cool, dry place. Wipe up
fuel spills before attempting to start
the saw.

5) Start the engine at least 10 feet
from the fueling site

Figure 3

Figure 4

Figure 5

Figure 7