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Idiomas disponibles
Idiomas disponibles
CHAIN MAINTENANCE
For smooth and fast cutting, the chain needs to be maintained properly.
The following conditions
indicate that the chain requires sharpening:
Wood chips are small and powdery.
The chain must be forced through the wood during cutting.
The chain cuts to one side.
During maintenance
of the chain, consider the following:
The depth gauge (or raker clearance) setting determines
the height
at which the cutter enters the wood and the size of the wood chip
that is removed (Fig. 40). Too much clearance increases the
potential for kickback. Too little clearance decreases the size of
the wood chip, thus decreasing the chain's cutting ability.
If the cutter teeth have hit hard objects, such as nails and stones,
or were abraded by mud or sand on the wood, have a service
dealer sharpen the chain.
NOTE:
Inspect the drive sprocket for wear or damage when
replacing the chain. If signs of wear or damage are present
in the areas indicated,
have the drive sprocket
replaced by
an authorized service center.
NOTE:
If you do not fully understand the correct procedure for
sharpening the cutters after reading the instructions
that
follow, have the saw chain sharpened
by an authorized
service center or replace the chain with a recommended
low-kickback
chain.
SHARPENING
THE CUTTERS
_
ARNING:
A dull or improperly
sharpened
chain
can cause excessive engine speed during cutting,
which may result in severe engine damage.
_
WARNING:
Improper chain sharpening
increases
the potential
of kickback. Failure to replace or repair a
damaged chain can cause serious injury.
Be careful to file all cutters to the specified
angles and to the same
length. Fast cutting can be obtained only when all cutters are uniform.
Tighten the chain tension enough so that the chain does not
wobble. Do all of the filing at the midpoint of the guide bar. Wear
gloves for protection.
Use a 3/16" round file and holder.
Keep the file level with the top plate of the tooth (Fig. 41). Do not
let the file dip or rock (Fig. 42).
Using light but firm pressure, stroke towards the front corner of the
tooth (Fig. 42). Lift the file away from the cutter before returning
the file to the beginning of the sharpening
stroke.
Put a few firm strokes on every tooth. File all left hand cutters in
one direction
(Fig. 43). Then move to the other side and file the
right hand cutters in the opposite direction
(Fig. 43). Occasionally
remove filings from the file with a wire brush.
Top Plate Filing Angle
CORRECT (30°) - File holders are marked with guide marks to align
the file properly and produce the correct top plate angle (Fig. 44).
INCORRECT (LESS THAN 30 °) - For cross cutting (Fig. 45).
INCORRECT (MORE THAN 30 °) - This creates a feathered edge
that dulls quickly.
Side Plate Filing Angle
CORRECT (80 °) - This is produced automatically
if the correct
diameter file is used in the file holder (Fig. 44).
INCORRECT (HOOK) - This causes the chain to "grab" and dull
quickly, increasing the potential
for kickback.
A hook is caused by
using a file with too small a diameter or a file held too low (Fig. 45).
INCORRECT (BACKWARD
SLOPE) - This causes a need for too
much feed pressure, producing excessive wear to the guide bar
and chain. A backward
slope is caused by using a file with too
large a diameter or a file held too high.
MAINTAINING
DEPTH GAUGE CLEARANCE
Maintain the depth gauge at a clearance of 1/32" (0.6 mm). Use a
depth gauge tool for checking the depth gauge clearances. (Fig. 40)
Every time the chain is filed, check the depth gauge clearance.
Use a flat file and a depth gauge jointer to lower all gauges
uniformly (Fig. 46). Use a 1/32 inch (0.6 mm) depth gauge jointer.
After lowering each depth gauge, restore the original shape by
rounding the front (Fig. 47). Be careful not to damage adjoining
drive links with the edge of the file.
Depth gauges must be adjusted
with the flat file in the same
direction the adjoining cutter was filed with the round file.
Use care not to contact the cutter face with the flat file when
adjusting depth gauges.
Raker
Clearance
1/32" (0.6 mm)
Cutting
Corner
Gullet J-
-_ _J,J
Fig. 40
Filing Height
Fig. 41
Filing Angle
Fig. 42
Left Hand
Cutters
Right Hand
Cutters
Fig. 43
Correct
Filing Angles
Top Plate
30°
Side
Plate
__
o°
Fig. 44
incorrect
Less Than 30°
More Than 30°
Filing Angles
@
@
Top Plate
Hook
Backward Slope
Fig. 45
Depth
Gauge Jointer
Fig. 46
Fiat File
Restore
Original
Shape by Rounding
the Front
MAINTAINING
THE GUIDE BAR
To minimize guide bar wear, the following
maintenance
procedures
are recommended:
Rotate the guide bar frequently at regular intervals (for example,
after every 5 hours of operation),
to ensure even wear on the top
and bottom of the guide bar (Fig. 48).
Clean the guide bar groove and oil passages whenever the saw chain
is removed, when the unit has been used heavily or when the saw
chain appears dirty (Fig. 49). Oil passages can be cleaned with a soft
wire small enough to insert into the oil discharge hole (Fig. 49).
NOTE:
If the oil passages are clear, the saw chain will give off a
spray of oil within seconds of starting the unit.
Frequently check the guide bar for damage. Feathering and burring of
the guide bar rails (the ridges on either side of the bar groove) is a
normal process of guide bar wear. Such faults should be smoothed
with a file as soon as they occur.
A guide bar with the following
faults should be replaced:
Wear inside the guide bar rails that permits the chain to lay sideways.
Bent guide bar.
Cracked or broken rails.
Spread rails.
Lubricating
the Guide Bar Sprocket
Tip
CAUTION:
The guide bar sprocket
tip was pre-
lubricated
at the factory. Lubrication
of the guide bar
sprocket
tip is recommended
after every 10 hours of
operation
or once per week, whichever
comes first.
Always thoroughly
clean the guide bar sprocket
tip
before lubrication.
Failure to lubricate the guide bar
sprocket
tip as explained
below will result in poor
performance
and seizure, voiding the warranty.
NOTE:
It is not necessary to remove the saw chain to lubricate the
guide bar sprocket tip.
1. Clean the guide bar sprocket tip.
2. Insert the tip of the lube gun (not included) into the lubrication
hole and inject grease until it appears at the outer edge of the
guide bar sprocket tip (Fig. 50).
NOTE:
The lube gun is recommended
for applying grease to the
guide bar sprocket tip. The lube gun is equipped
with a
needle nose tip, which is necessary for the efficient
application
of grease to the guide bar sprocket tip.
3. Rotate the saw chain by hand. Repeat the lubrication
procedure
until the entire guide bar sprocket
tip is greased.
CLEANING
THE AIR FILTER
I_
! CAUTION:
Never operate the unit without the air
i
filter, Dust and dirt will be drawn into the engine and
damage
it. Keep the air filter clean,
1. Remove the air filter cover by loosening the cover-retaining
screws (Fig. 51). The cover will lift off.
2. Remove the air filter.
3. Wash the air filter in clean, warm, soapy water. Rinse the air filter
in clean, cool water. Allow the filter to air dry completely.
NOTE:
It is advisable to have a supply of spare air filters.
4. Install the air filter and replace the air filter cover. Make sure the
air filter cover fits properly. Tighten the cover-retaining
screws
securely.
CLEANING
THE SPARK ARRESTOR
SCREEN
NOTE:
A clogged spark arrestor screen will dramatically
reduce
engine performance.
1. Locate the muffler assembly at the front of the unit. Use a small
2.
3.
4.
5.
6.
7.
8.
g.
NOTE:
Do not operate the unit without the plugs securely installed.
INSPECTING/ADJUSTING/REPLACING
THE SPARK PLUG
NOTE:
For efficient operation,
the spark plug must be kept clean
and properly gapped.
0
Fig. 48
Fig. 49
Fig. 50
Fi,ter
Fig. 51
Outer
Spark
Muffler
Deflector
Arrestor
Assembly
/P"
Plugs (2)
assembly,flat-blade
screwdriver
t° rern°ve the tw° plugs fr°rn the muffler
IG!_4
(_/_
__
Use a T27 Torx wrench to remove the two muffler-retaining
screws
(Fig. 52).
Deflector-retaining
Remove the muffler assembly and gasket from the unit.
Screw
Muffler-retaining Screws
Use the multi-purpose
tool or a #2 Phillips screwdriver to remove
Fig.52
the deflector-retaining
screw.
Remove the outer deflector and spark arrestor screen.
Use a small wire brush to remove debris from the spark arrestor screen.
Reconnect the spark arrestor screen and outer deflector to the muffler assembly. Make sure the two tabs on the outer
deflector are inserted into the two slots on the muffler assembly. Tighten the deflector-retaining
screw securely.
Insert the two muffler-retaining
screws into the muffler assembly. Place the gasket behind the muffler assembly so
that the two muffler-retaining
screws pass through the two holes in the gasket. Make sure the narrow end of the
gasket faces the bottom of the muffler assembly (Fig. 52). Insert the muffler assembly
and gasket into the cavity at
the front of the unit so that the screws align with the two screw holes in the front cavity. Tighten the muffler-
retaining screws securely to a torque of 80-90 in.lbs. If necessary, hold the gasket from the side with a pair of
needle-nose
pliers while tightening the screws. If assistance
is required for achieving the proper torque, have the
unit serviced by an authorized service dealer.
Insert the two plugs into the muffler assembly. With a blunt tool, lightly tap the plugs firmly into place.
I_
I WARNING:
Do not sand blast, scrape or clean
i
spark plug electrodes.
Dislodged
grit could damage
the cylinder. Replace corroded
spark plugs.
1. Push the stop switch up to the STOP position.
2. Use the multi-purpose
tool to remove the two retaining screws
from the top plate (Fig. 53). Remove the top plate.
3. Disconnect
the wire connector from the spark plug by pulling and
twisting at the same time (Fig. 53).
4. Remove the spark plug with a spark plug socket wrench. DO NOT
USE ANY OTHER TOOL.
Fig. 53
5. Check the electrode
gaps with a wire feeler gauge. The gap should be set to 0.025 in. (0.635 mm). Adjust the gaps
if necessary.
6. Reinstall the correctly gapped spark plug or, if needed, install a new spark plug (Champion®
RDJ8J or equivalent).
NOTE:
A resistor spark plug must be used for replacement
(part number 753-06269
or Champion®
RDJ8J).
CARBURETOR
ADJUSTMENT
The carburetor was pre-set at the factory for optimum performance.
If further adjustments
are necessary, please have
the unit serviced by an authorized service dealer.
Fig. 47
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