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Hitachi RB24EA Seite 6

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English
CAUTION
This blower has been designed and adjusted to be used with all
blowing pipes attached. It must never be operated without the
straight pipe, and conic pipe.
Stopping (Fig. 9)
Decrease engine speed and run at an idle for a few minutes, then
turn off ignition switch.
MAINTENANCE
MAINTENANCE, REPLACEMENT OR REPAIR OF THE EMISSION
CONTROL DEVICES AND SYSTEMS MAY BE PERFORMED
BY ANY NON-ROAD ENGINE REPAIR ESTABLISHMENT OR
INDIVIDUAL.
Carburetor adjustment (Fig. 10)
In the carburetor, fuel is mixed with air. When the engine is test
run at the factory, the carburetor is basically 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. If adjustment is required, turn
IDLE speed Adjustment Screw (T) close (clockwise) to increase
engine speed, open (counterclockwise) to decrease engine speed.
Standard Idle rpm is 2800-3200rpm.
RECOMMENDATION
CARBURETOR ADJUSTMENT NEEDS THE SKILL OF
EXPERIENCED OR WELL TRAINED PEOPLE, OR IS
RECOMMENDED TO TAKE THE UNIT TO HITACHI DEALER.
Air fi lter (Fig. 11)
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
Remove the air cleaner cover by pushing and pulling back the tab
on the top.
Clean the air fi lter daily or more often if working in exceptionally
dusty areas.
Cleaning the air fi lter
Open the air fi lter 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 with a new one. A damaged fi lter must
always be replaced.
Fuel fi lter (Fig. 12)
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. 13)
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.
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 the dust cover for damage or cracks. Change the cover
in case of impacts or cracks.
○ Check that nuts and screws are suffi
ciently tightened.
Weekly maintenance
○ Check the starter, especially the cord.
○ 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.
○ 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 muffl er of carbon.
CAUTION
Cleaning of cylinder fi ns, fan and muffl er shall be done by a
Hitachi Authorized Service Center.
NOTE
When ordering the parts to your nearest dealer, please use
the item No. showing on the parts breakdown section in this
instruction.
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