13
WARNING
Improper chain sharpening increases the potential
of kickback.
WARNING
Failure to replace or repair a damaged chain can
cause serious injury.
TOP PLATE FILING ANGLE
See Figure 53.
(A)
CORRECT 30° – fi le holders are marked with guide
marks to align fi le properly to produce correct top plate
angle.
(B)
LESS THAN 30° – for cross cutting.
(C)
MORE THAN 30° – feathered edge dulls quickly.
SIDE PLATE ANGLE
See Figure 54.
(D) CORRECT 80° – Produced automatically if you use the
correct diameter fi le in the fi le holder.
(E) HOOK – “Grabs” and dulls quickly; increases the
potential of KICKBACK. Results from using a fi le with a
diameter too small or a fi le held too low.
(F) BACKWARD SLOPE – Needs too much feed pressure;
causes excessive wear to the bar and chain. Results
from using a fi le with a diameter too large or fi le held
too high.
MAINTAINING DEPTH GAUGE CLEARANCE
See Figure 55 - 57.
■
Maintain the depth gauge at a clearance of 0.6 mm.
Use a depth gauge tool for checking the depth gauge
clearances (A).
■
Every time the chain is fi led, check the depth gauge
clearance.
■
Use a fl at fi le (B)(not provided) and a depth gauge jointer
(C)(not provided) to lower all gauges uniformly. Use a 0.6
mm depth gauge jointer. After lowering each depth gauge,
restore original shape by rounding the front. Be careful
not to damage adjoining drive links with the edge of the
fi le.
■
Depth gauges must be adjusted with the fl at fi le in the
same direction the adjoining cutter was fi led with the
round fi le. Use care not to contact cutter face with fl at
fi le when adjusting depth gauges.
MAINTAINING THE GUIDE BAR
See Figure 58.
MAINTENANCE
CAUTION
Make sure the chain has stopped before you do any
work on the saw.
Every week of use, reverse the guide bar on the saw to
distribute the wear for maximum bar life.The bar should
be cleaned every day of use and checked for wear and
damage.
Feathering or burring of the bar rails is a normal process
of bar wear. Such faults should be smoothed with a fi le as
soon as they occur.
A bar with any of the following faults should be replaced:
■
Wear inside the bar rails which permits the chain to lie
over sideways;
■
Bent guide bar;
■
Cracked or broken rails;
■
Spread rails.
In addition, lubricate guide bars (with a sprocket at their
tip) weekly. Using a grease syringe, lubricate weekly in
the lubricating hole. Turn the guide bar and check that
the lubrication holes (A) and chain groove are free from
impurities.
CAUTION
Make sure the air cleaner is correctly placed in the air
fi lter cover before reassembly. Never run the engine
without the air fi lter, serious damage could result.
CLEANING THE AIR CLEANER
See Figures 59 - 60.
ADJUSTING THE CARBURETOR
See Figures 61 - 63.
Before adjusting the carburetor:
■
Use a brush or compressed air to clean the starter cover
vents.
■
Clean the air cleaner (A). Refer to Cleaning the Air
Cleaner in the Maintenance section of this manual.
■
Allow the engine to warm up prior to adjustment of engine
idle speed.
WARNING
Weather conditions and altitude may affect
carburetion. Do not allow bystanders close to the
chain saw while adjusting the carburetor.
Idle Speed Adjustment —The idle speed adjustment controls
how much the throttle valve stays open when the throttle
trigger is released. To adjust:
■
Turn idle speed screw “T” clockwise to increase idle
speed.
■
Turn idle speed screw “T” counterclockwise to decrease
idle speed.