9
English
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 Authorized Service Centers.
NOTE
Standard Idle rpm is 3000 min
-1
.
WARNING
When the engine is idling the cutting attachment must under no
circumstances rotate.
Air
fi
lter
(
Fig.
18
)
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 (19). 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.
19
)
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 build-up, replace it.
Spark
plug
(
Fig.
20
)
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.
Cutting
blade
(
Fig.
21,
22
)
The blades are installed to the blade guide with three to
fi
ve bolts
depending on blade length. Those bolts are tightened with a
clearance so that the blades can move smoothly.
When
clearance
is
too
small
The blades do not move properly and the sliding surfaces may seize.
When
clearance
is
too
large
The blades are poor in sharpness.
To
adjust
the
blade
clearance
1. Loosen the blade
fi
xing nuts.
2. Fully tighten the blade
fi
xing bolts and then loosen them approx.
1/2 turn.
3. With the bolts set at that position, tighten the blade
fi
xing nuts.
Be sure to replace blade guide
fi
xing bolts when they are loosened,
worn or damaged. Also be sure to replace damaged cutter blade.
NOTE
Properly lubricate the blade sliding surfaces with machine oil.
Gear
case
(
Fig.
23
)
Apply good quality lithium based grease through the grease
fi
ttings.
On some models, one of the grease
fi
ttings has been moved from
upper location to the bottom.
NOTE
Lubrication should be applied about 5 g at 20 hour intervals and
more frequently with heavy use.
Maintenance
schedule
Below you will
fi
nd some general maintenance instructions. For
further information please contact Hitachi Authorized Service
Centers.
Daily
maintenance
○
Check to ascertain that the fuel is not leaking.
○
Clean the exterior of the unit.
○
Check the blade guard 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 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 the spark plug and check the electrode gap. Adjust it to
0.6 mm or change the spark plug.
○
Check that the air intake at the starter is not clogged.
○
Check that the angle gear is
fi
lled with grease.
○
Clean the air
fi
lter.
Monthly
maintenance
○
Rinse the fuel tank with gasoline, and clean fuel
fi
lter.
○
Clean the exterior of the carburetor and the space around it.
Quarterly
maintenance
○
Clean the cooling
fi
ns on the cylinder.
○
Clean the fan and the space around it.
○
Clean the mu
ffl
er of carbon.
CAUTION
Cleaning of cylinder
fi
ns, fan and mu
ffl
er shall be done by a
Hitachi Authorized Service Center.
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