McCulloch MAC 838 Chainsaw User Manual


 
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
whenhandlingchain. Thechainissharpand
can cut you even when it is not moving.
NOTE: When adjusting chain tension,
make sure the ba r nuts are finger tight only.
Attemptingtotensionthechainwhenthebar
nuts are tight can cause damage.
Checking the tension:
Usethe screwdriver end ofthe chainadjust-
ment tool (bar tool) to move chain around
guidebar.Ifthechaindoesnotrotate,itist oo
tight. Ifthechainis tooloose,itwillsagbelow
the bar.
Chain Adjustment
Tool
(Bar Tool)
Guid
e
Bar
Adjusting
Screw
Bar Nuts
Adjusting the tension:
Chain tension is very im portant. 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. Loosenbar nutsuntil theyare fingertight
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.
Releasetipofguidebar,thenturnadjust-
ingscrew
1
/
4
turnclockwise. Repeatun-
til sag doe s 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. Usethescrewdriverendofthebartoolto
move chain around guide bar.
7. If chain does not rotate, it is too tight.
Slightlyloosenba rnutsandloosenchain
by turning the adjusting screw
1
/
4
turn
counterclockwise. Retighten bar nuts.
8. If chain is too loose, it will sag below the
guidebar.DONOToperatethesawifthe
chain is loose.
WARNING: I f the saw is operated
with a loose chain, the chain could jump off
the guide bar and result in serious injury.
WARNING:Muf flerisvery hotduring
andafter use. Do nottouchthe muffleroral-
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
informationinthesafety rules before yoube-
gin.Ifyoudonotunderstandthesafetyrules,
do not attempt to fuel your unit. Contact an
authorized service dealer.
BAR AND CHAIN LUB RICATION
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 ofoil will quickly ruin the bar and
chain. Too little oil will cause overheating
shownbysmokecomingfromthechainand/
or discoloration of the bar. Onlyuse Bar and
Chain Oil for bar and chain lubrication.
FUELING ENGINE
WARNING: Removefuelcapslowly
when refueling.
This engine is certified to operate on unleaded
gasoline. Before operation, gasoline must be