McCulloch MAC 838 - Manual (Page 8)

8
Clutch
Cover
Lower
Hole
Guide Bar
Adjusting Pin
12. 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.
Chain Adjustment
Tool
(Bar Tool)
Guide
Bar
Adjusting
Screw
Bar Nuts
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.
1. Loosen bar nuts until they are finger tight
against the clutch cover.
2. Turn adjusting screw clockwise until chain
solidly contacts bottom of guide bar rail.
Adjusting
Screw
3. Using bar tool, roll chain around guide bar
to ensure all links are in bar groove.
4. Lift up tip of guide bar to check for sag.
Release tip of guide bar, then turn adjust-
ing screw 1 /
4
turn clockwise. Repeat un-
til sag does not exist.
Adjusting Screw -- 1 /
4
Turn
5. While lifting tip of guide bar, tighten bar
nuts securely with the bar tool.
Bar Nuts
6. Use the screwdriver end of the bar tool to
move chain around guide bar.
7. If chain does not rotate, it is too tight.
Slightly loosen bar nuts and loosen chain
by turning the adjusting screw 1 /
4
turn
counterclockwise. Retighten bar nuts.
8. 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.
WARNING
: Muffler is very hot during
and after use. Do not touch the muffler or al-
low combustible material such as dry grass
or fuel to do so.
OPERATING YOUR UNIT
BEFORE STARTING ENGINE
WARNING : Be sure to read the fuel
information in the safety rules before you be-
gin. If you do not understand the safety rules,
do not attempt to fuel your unit. Contact an
authorized service dealer.
BAR AND CHAIN LUBRICATION
The bar and chain require continuous lubri-
cation. Lubrication is provided by the auto-
matic oiler system when the oil tank is kept
filled. Lack of oil will quickly ruin the bar and
chain. Too little oil will cause overheating
shown by smoke coming from the chain and/
or discoloration of the bar. Only use Bar and
Chain Oil for bar and chain lubrication.
FUELING ENGINE
WARNING
: Remove fuel cap slowly
when refueling.
This engine is certified to operate on unleaded
gasoline. Before operation, gasoline must be