Poulan Pro SM4218 AV - Manual (Page 7)

7
CUTTERS MUST FACE IN
DIIRECTION OF ROTATION
Tip of
Bar
Cutters Depth Gauge
Drive Links
6. Place chain over and behind the clutch
retainer, fitting the drive links in the
clutch drum sprocket.
7. Fit bottom of drive links between the
teeth in the sprocket in the nose of the
guide bar.
8. Fit chain drive links into bar groove.
9. Pull guide bar forward until chain is snug
in guide bar groove. Ensure all drive
links are in the bar groove.
10. Hold guide bar against the saw frame
and install clutch cover.
11. Install bar nuts and finger tighten only.
Once the chain is tensioned, you will
need to tighten bar nuts.
CHAIN TENSION
(Including units with chain already installed)
WARNING:
Wear protective gloves
when handling chain. The chain is sharp and
can cut you even when it is not moving.
NOTE: When adjusting chain tension,
make sure the bar nuts are finger tight only.
Attempting to tension the chain when the bar
nuts are tight can cause damage.
Checking the tension:
Use the screwdriver end of the chain adjust-
ment tool (bar tool) to move chain around
guide bar. If the chain does not rotate, it is too
tight. If the chain is too loose, it will sag below
the bar.
Bar Nuts
Chain Adjustment
Tool
(Bar Tool)
Guide
Bar
Adjusting the tension:
Chain tension is very important. Chains
stretch during use. This is especially true
during the first few times you use your saw.
Always check chain tension each time you
use and refuel your saw.
An adjusting screw (located on the guide
bar) is used to adjust the tension of the chain
(see illustration).
1. Turn adjusting screw clockwise until chain
solidly contacts bottom of guide bar rail.
Adjusting
Screw
Guide bar
2. Using bar tool, roll chain around guide bar
to ensure all links are in bar groove.
3. Lift up tip of guide bar to check for sag.
Release tip of guide bar, then turn ad-
justing screw clockwise until sag does
not exist.
4. While lifting tip of guide bar, tighten bar
nuts securely with the bar tool.
Bar Nuts
5. Use the screwdriver end of the bar tool
to move chain around guide bar.
6. If chain does not rotate, it is too tight.
Slightly loosen bar nuts and loosen
chain by turning the adjusting screw.
Retighten bar nuts.
7. If chain is too loose, it will sag below the
guide bar. DO NOT operate the saw if
the chain is loose.
WARNING: If the saw is operated
with a loose chain, the chain could jump off
the guide bar and result in serious injury.