Hitachi Koki CG 28EJ Instrucciones De Manejo página 12

English
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 Hitachi dealer.
WARNING
When the engine is idling the cutting attachment must under no
circumstances rotate.
Air fi lter (Fig. 31)
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 (32). 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. 32)
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. 33)
The spark plug condition is infl 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 diffi culties. If the engine is
low on power, diffi 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.
Muffl er (Fig. 34)
Remove the muffl er and clean out any excess carbon from the
exhaust port or muffl er inlet every 100 hours of operation.
Cylinder (Engine cooling) (Fig. 35)
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.
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NOTE
Do not operate engine with engine shroud or muffl er guard
removed as this will cause overheating and engine damage.
Angle transmission (Fig. 36)
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. 37)
WARNING
Wear protective gloves
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 Hitachi,
with a 25.4 mm (one inch) fi tting hole.
○ When installing a saw blade (34), always face the stamped side
up. In the case of a 4 tooth blade (33), 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 Hitachi 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 off -centre cutting attachment induces
heavy vibrations that may damage the unit.
○ Check that the cutting attachment nut is suffi 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 suffi 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.
when handling or performing