McCulloch 442 Chainsaw User Manual


 
13
Air Filter
Cylinder Co
v
er
Screws
Cylinder
Cover
BAR MAINTENANCE
Ifyour saw cutsto oneside, hasto beforced
throughthecut,orbeenrunwithanimproper
amount of bar lubrication it may be neces-
sarytoserviceyourbar. Awornbarwilldam-
age your chain and make cutting difficult.
After each use, ensure ON/STOP switch is
inthe STOP position, thenclean allsawdust
from the guide bar and sprocket hole.
Tomaintain guide bar:
S Move ON/STOP switch to the STOP posi-
tion.
S Loosen and remove chain brake nuts and
chain brake. Remove bar and chain from
saw.
S Clean the oilholes a ndbar grooveaftereach
5 hours of operation.
Remove Sawdust From
Guide Bar Groove
Oil Hole
S Burring of guide bar rails is a normal
process of rail wear. Remove these burrs
with a flat file.
S Whenrailtopisuneven,useaflatfiletore-
store square edges and sides.
Correct GrooveWorn Groove
File Rail Edges
and Sides
Square
Replaceguide bar when thegroove is worn,
the guide bar is bent or cracked, or when
excess heatingorburringoftherailsoccurs.
If replacement is necessary,useonly theguide
barspecifiedforyoursawintherepairparts list
or on the decal located on the chain saw.
SPARK PLUG
The spark plug should be replaced each
year to ensure the engine starts easier and
runs better . Ignition tim ing is fixed andnon-
adjustable.
1. Loosen 3 screws on cylinder cover .
2. Remove the cylinder cover.
3. Pull off the spark plug boot.
4. Remove spark plug from cylinder and
discard.
5. Replace with Champion RCJ--7Y spark
plug and tighten securely with a 19 mm
socket wrench. Spark plug gap should be
0,5 mm.
6. Reinstall the spark plug boot.
7. Reinstall the cylinder cover and 3
screws. Tighten securely .
Cylinder
Cover
Cylinder Co
v
er
Screws
Spark
Plug
Spark Plug Boot
CHAIN SHARPENING
Chain sharpening is a complicated task that
requires special tools. We recommend that
you referchain sharpeningto aprofessional
chain sharpener.
CARBURETOR ADJUSTMENTS
WARNING: Thechainwillbemoving
during most of this procedure. W ear your pro-
tective equipment and observe all safety pre-
cautions. The chain must not move at idle
speed.
The carburetor has been carefully set at the
factory. Adjustments may be necessary if
you notice any of the following conditions:
S Chain moves a tidle. See IDLESPEED--T
adjusting procedure.
S Saw willnot idle. SeeIDLESPEED--T ad-
justing procedure.
Idle Speed---T
Allow engineto idle. If thechain moves, idle
istoofast. Iftheenginestalls,idleis tooslow.
Adjustspeeduntil engineruns withoutchain
movement (idle too fast) or stalling (idle too
slow). Theidlespeedscrew islocatedinthe
area above the p rimerbulb and is labeled T.
S Turnidle speed screw (T) clockwise to in-
crease engine speed.
S Turn idle speed screw (T) counterclock-
wise to decrease engine speed.
STORAGE
WARNING:Stop engineandallowto
cool, and secure the unit before storing or
transporting in a vehicle. Store unit and fuel
in an area where fuel vapors cannot reach
sparks or open flames from water heaters,
electric motors or switches, furnaces, etc.
Storeunitwithallguardsinplace.Positionso
that any sharp object cannot accidentally
cause injury to passersby. Store the unit out
of reach of children.
S Before storing, drain all fuel from the unit.
Start engineand allow torun untilit stops.