8
English
Lubricating
the
blade
(
Fig.12
)
During trimming, sap adhering to the blade edge will increase load.
Use machine oil (or bicycle oil or the like) to lubricate the blade and
wipe the blade with a cloth. To prevent the blade from rusting, be
sure to lubricate the blade after use and when it will not be used for
an extended period of time before placing it in the blade case.
Gear
case
(
Fig.
13
)
Apply a good quality lithium based grease through the grease
fi
tting
until a small amount comes out between the cutting blades and the
gear case. Lubricate the grease from the grease nipple (indicated
by an arrow) next to the gear case using a commercially available
cartridge grease gun.
NOTE
Lubrication should be applied 3g at 20 hour intervals and more
frequently with heavy use.
Fuel
fi
lter
(
Fig.
14
)
Remove the fuel
fi
lter from the fuel tank and thoroughly wash it in
solvent. After that, push the
fi
lter into the tank completely.
NOTE
If
the
fi
lter is hard due to dust and dirt, replace it.
Cleaning
the
cylinder
fi
ns
(
Fig.
15
)
When leaves get caught between cylinder
fi
ns (7), the engine may
overheat, resulting in lower output. To avoid this, always keep
cylinder
fi
ns and cylinder cover clean.
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.
Cleaning
the
mu
ffl
er
(
Fig.
16
)
Remove the mu
ffl
er and spark arrestor (if so equipped), and clean
out any excess carbon from the exhaust port or mu
ffl
er inlet every
100 hours of operation.
For
long
-
term
storage
Drain all fuel from the fuel tank. Start and let engine run until it stops.
Repair any damage which has resulted from use. Clean the unit with
a clean rag, or high pressure air hose. Put a few drops of two-cycle
engine oil into the cylinder through the spark plug hole, and spin the
engine over several times to distribute oil. Cover the unit and store
it in a dry area.
Maintenance
schedule
Below you will
fi
nd some general maintenance instructions. For
further information please contact your Hitachi dealer.
Daily
maintenance
○
Clean the exterior of the hedge trimmer.
○
Check the blade guide for damage or cracks. Change the guard
in case of impacts or cracks.
○
Check that the blade is sharp, and without cracks.
○
Check that the blade nut is su
ffi
ciently tightened.
○
Make sure that the blade blunt 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 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 gear case is
fi
lled with grease.
○
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.
MAINTENANCE
MAINTENANCE, REPLACEMENT OR REPAIR OF THE EMISSION
CONTROL DEVICES AND SYSTEM MAY BE PERFORMED
BY ANY NONROAD ENGINE REPAIR ESTABLISHMENT OR
INDIVIDUAL.
Carburetor
adjustment
(
Fig.
9
)
WARNING
○
The cutting attachment may be spinning during carburetor
adjustments.
○
Never start the engine without the complete cleaner cover.
Otherwise the clutch can come loose and cause personal
injuries.
In the carburetor, fuel is mixed with air. When the engine is test run
at the factory, the carburetor is adjusted. A further adjustment may
be required, according to climate and altitude. The carburetor has
one adjustment possibility:
T
=
Idle
speed
adjustment
screw.
Idle
speed
adjustment
(
T
)
Check that the air
fi
lter is clean. When the idle speed is correct, the
cutting attachment will not rotate. If adjustment is required, close
(clockwise) the T-screw, with the engine running, until the cutting
attachment starts to rotate. Open (counter-clockwise) the screw
until the cutting attachment stops. You have reached the correct idle
speed when the engine runs smoothly in all positions well below the
rpm when the cutting attachment starts to rotate.
If the cutting attachment still rotates after idle speed adjustment,
contact Hitachi dealer.
Air
fi
lter
(
Fig.
10
)
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 cleaner cover and the
fi
lter. 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 by a new one. A damaged
fi
lter must
always be replaced.
NOTE
Saturate the element in 2-cycle oil or the equivalent. Squeeze
the element to distribute the oil completely and to remove any
excess oil.
Spark
plug
(
Fig.
11
)
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. Readjust 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 the same type of spark
plug for replacement.
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000Book̲CH22EAP2(50ST)̲WE̲NE.indb 8
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2013/02/26 14:55:31
