12
○
Some models sold areas with strict exhaust emission regulation
do not have high and low speed carburetor adjustments. Such
adjustments may allow the engine to be operated outside of
their emission compliance limits. For these models, the only
carburetor adjustment is idle speed.
○
For models that equipped with low and high speed adjustments;
carburetors are preset at the factory. Minor adjustments may
optimize performance based on climate, altitude, etc. Never turn
the adjustment screws in increments greater than 90 degrees,
as engine damage can result from incorrect adjustment, if you
are not familiar with type of adjustment-assistance Tanaka
dealer.
WARNING
When the engine is idling the cutting attachment must under no
circumstances rotate.
Air
fi
lter
(Fig.
29)
The air
fi
lter must be cleaned from dust and dirt in order to avoid:
○
Carburetor
malfunctions
○
Starting
problems
○
Engine power reduction
○
Unnecessary wear on the engine parts
○
Abnormal fuel consumption
Clean the air
fi
lter daily or more often if working in exceptionally
dusty areas.
Cleaning
the
air
fi
lter
Remove the air
fi
lter cover and the
fi
lter (29). Rinse it in warm soap
suds. Check that the
fi
lter is dry before reassembly. An air
fi
lter
that has been used for some time cannot be cleaned completely.
Therefore, it must regularly be replaced with a new one. A damaged
fi
lter must always be replaced.
Fuel
fi
lter
(Fig.
30)
Drain all fuel from fuel tank and pull fuel
fi
lter line from tank. Pull
fi
lter
element out of holder assembly and rinse element in warm water
with detergent.
Rinse thoroughly until all traces of detergent are eliminated.
Squeeze, do not wring, away excess water and allow element to
air dry.
NOTE
If element is hard due to excessive dirt buildup, replace it.
Spark
plug
(Fig.
31)
The spark plug condition is in
fl
uenced by:
○
An incorrect carburetor setting
○
Wrong fuel mixture (too much oil in the gasoline)
○
A dirty air
fi
lter
○
Hard running conditions (such as cold weather)
These factors cause deposits on the spark plug electrodes, which
may result in malfunction and starting di
ffi
culties. If the engine is
low on power, di
ffi
cult to start or runs poorly at idling speed, always
check the spark plug
fi
rst. If the spark plug is dirty, clean it and check
the electrode gap. Re-adjust if necessary. The correct gap is 0.6
mm. The spark plug should be replaced after about 100 operation
hours or earlier if the electrodes are badly eroded.
NOTE
In some areas, local law requires using a resistor spark plug
to suppress ignition signals. If this machine was originally
equipped with resistor spark plug, use same type of spark plug
for replacement.
Mu
ffl
er
(Fig.
32)
Remove the mu
ffl
er and clean out any excess carbon from the
exhaust port or mu
ffl
er inlet every 100 hours of operation.
Cylinder
(Engine
cooling)
(Fig.
33)
The engine is air cooled, and air must circulate freely around engine
and over cooling
fi
ns on cylinder head to prevent overheating.
Every 100 operating hours, or once a year (more often if conditions
require), clean
fi
ns and external surfaces of engine of dust, dirt and
oil deposits which can contribute to improper cooling.
NOTE
Do not operate engine with engine shroud or mu
ffl
er guard
removed as this will cause overheating and engine damage.
Angle
transmission
(Fig.
34)
Check angle transmission or angle gear for grease level about
every 50 hours of operation by removing the grease
fi
ller plug on
the side of angle transmission.
If no grease can be seen on the
fl
anks of the gears,
fi
ll the
transmission with quality lithium based multipurpose grease up to
3/4. Do not completely
fi
ll the transmission.
Blade
(Fig.
35)
WARNING
Wear protective gloves when handling or performing
maintenance on the blade.
○
Use a sharp blade. A dull blade is more likely to snag and thrust.
Replace the fastening nut if it is damaged and hard to tighten.
○
When replacing blade, purchase one recommended by Tanaka,
with a 25.4 mm (one inch)
fi
tting hole.
○
When installing a saw blade (31), always face the stamped side
up. In the case of a 4 tooth blade (30), it can be used on either
side.
○
Use the correct blade for the type of work.
○
When replacing blades, use appropriate tools.
○
When cutting edges become dull, re-sharpen or
fi
le as shown
in the illustration. Incorrect sharpening may cause excessive
vibration.
○
Discard blades that are bent, warped, cracked, broken or
damaged in any way.
NOTE
When sharpening blade it is important to maintain an original
shape of radius at the base of the tooth to avoid cracking.
Maintenance
schedule
Below you will
fi
nd some general maintenance instructions. For
further information please contact your Tanaka dealer.
Daily
maintenance
○
Clean the exterior of the unit.
○
Check that the harness is undamaged.
○
Check the blade guard for damage or cracks. Change the guard
in case of impacts or cracks.
○
Check that the cutting attachment is properly centred, sharp,
and without cracks. An o
ff
-centre cutting attachment induces
heavy vibrations that may damage the unit.
○
Check that the cutting attachment nut is su
ffi
ciently tightened.
○
Make sure that the blade transport guard is undamaged and
that it can be securely
fi
tted.
○
Check that nuts and screws are su
ffi
ciently tightened.
Weekly
maintenance
○
Check the starter, especially the cord and return spring.
○
Clean the exterior of the spark plug.
○
Remove it and check the electrode gap. Adjust it to 0.6 mm, or
change the spark plug.
○
Clean the cooling
fi
ns on the cylinder and check that the air
intake at the starter is not clogged.
○
Check that the angle gear is
fi
lled with grease up to 3/4.
○
Clean the air
fi
lter.
Monthly
maintenance
○
Rinse the fuel tank with gasoline.
○
Clean the exterior of the carburetor and the space around it.
○
Clean the fan and the space around it.
000Book̲TBC-270S.indb 12
000Book̲TBC-270S.indb 12
2012/06/21 16:41:59
2012/06/21 16:41:59