Patriot Products 1900 - Manual (Page 14)

14
harmful emissions. Always clean after every
5 hours of operation.
S
Clean the cover and the area around it to
keep dirt and sawdust from falling into the
carburetor chamber when the cover is re-
moved.
S Remove the parts as illustrated below.
S Wash the filter in soap and water. Air dry
completely before reinstalling.
S Lightly oil air filter before installing to im-
prove the efficiency of the air filter. Use
2--cycle engine oil or motor oil (SAE 30).
Squeeze excess oil from filter.
S Reinstall parts.
Air Filter
Cylinder Cover
Screws
Cylinder
Cover
INSPECT MUFFLER AND SPARK
ARRESTING SCREEN
As the unit is used, carbon deposits build up
on the muffler and spark arresting screen,
and must be removed to avoid creating a fire
hazard or affecting engine performance.
Replace the spark arresting screen if breaks
occur.
Muffler Diffuser
Muffler
Cover
Screws
Muffler
Cover
Muffler
Body
Spark
Arresting
Screen
CLEANING THE SPARK ARREST-
ING SCREEN
Cleaning is required every 25 hours of op-
eration or annually, whichever comes first.
S
Loosen and remove the 2 muffler cover
screws.
S Remove the muffler cover (cover snaps off
muffler body).
S Remove muffler diffuser and spark arrest-
ing screen assembly. Notice the orienta-
tion of these parts for reassembling.
S Clean the spark arresting screen with a wire
brush. Replace screen if breaks are found.
S Replace any broken or cracked muffler
parts.
S Reinstall diffuser and spark arresting screen
assembly with round holes facing up.
S Reinstall muffler cover and 2 screws.
Tighten securely.
CARBURETOR ADJUSTMENTS
Your carburetor is equipped with limiter
caps. Carburetor adjustment is a compli-
cated task. We recommend that you take
your unit to an Authorized Service Dealer.
Damage will occur if you turn the needles be-
yond the limiter stops.
BAR MAINTENANCE
If your saw cuts to one side, has to be forced
through the cut, or been run with an improper
amount of bar lubrication it may be neces-
sary to service your bar. A worn bar will dam-
age your chain and make cutting difficult.
After each use, ensure ON/STOP switch is
in the STOP position, then clean all sawdust
from the guide bar and sprocket hole.
To maintain 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 oil holes and bar groove after
each 5 hours of operation.
Remove Sawdust From
Guide Bar Groove
Sprocket Hole
Oil Holes
S Add lubricant to sprocket hole after each
use.
S Burring of guide bar rails is a normal
process of rail wear. Remove these burrs
with a flat file.
S When rail top is uneven, use a flat file to re-
store square edges and sides.
Correct Groove Worn Groove
File Rail Edges
and Sides
Square
Replace guide bar when the groove is worn,
the guide bar is bent or cracked, or when
excess heating or burring of the rails occurs.
If replacement is necessary, use only the
guide bar specified for your saw in the repair
parts list or on the decal located on the chain
saw.
CHAIN SHARPENING
Chain sharpening is a complicated task that
requires special tools. We recommended
you refer chain sharpening to a professional
chain sharpener.
IGNITION TIMING
Ignition timing is fixed and nonadjustable.
SPARK PLUG
The spark plug should be replaced each
year to ensure the engine starts easier and
runs better.
S
Loosen 3 screws on cylinder cover.
S Remove the cylinder cover.
S Pull off the spark plug boot.
S Remove spark plug from cylinder and dis-
card.