Bedienungsanleitung Hitachi RB24E (Seite 8 von 48) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch)

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GB-6

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. 11)

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 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.

CAUTION

The above adjusting procedure must be followed when adjustment

is MADE or DAMAGE to engine will occur because of the incorrect

condition.

NOTE

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.

RECOMMENDATION:

CARBURETOR ADJUSTMENT NEEDS THE SKILL OF EXPERIENCED

OR WELL TRAINED PEOPLE, OR IS RECOMMENDED TO TAKE

THE UNIT TO

Hitachi Authorized Service Centers

Air lter (Fig. 12)

The air 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. (Fig. 12)

Cleaning the air lter

Clean the cleaner element every day or every 8 hours of operation.

More frequent cleaning is recommended under very dusty

conditions. Wash the element in liquid detergent and water.

Squeeze the element to remove the dirt. Press the element in a dry

rag until it is completely dry. Saturate the element in 2 cycle oil.

Squeeze the element to distribute the oil completely and to remove

any excess oil. Replace the element and install the cover. (Fig. 13)

An air lter that has been used for some time cannot be cleaned

completely. Therefore, it must regularly be replaced with a new

one. A damaged lter must always be replaced.

Fuel lter (Fig. 14)

Drain all fuel from fuel tank and pull fuel lter line from tank. Pull

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. 15)

The spark plug condition is inuenced by:

• An incorrect carburetor setting.

• Wrong fuel mixture (too much oil in the gasoline).

• A dirty air lter.

• Hard running conditions (such as cold weather).

These factors cause deposits on the spark plug electrodes, which

may result in malfunction and starting difculties. If the engine

is low on power, difcult to start or runs poorly at idling speed,

always check the spark plug 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 nd some general maintenance instructions. For

further information please contact Hitachi Authorized Service

Centers.

Daily maintenance

• Clean the exterior of the unit.

• Check that the air intake at the dust cover is not clogged.

• Check the dust cover for damage or cracks. Change the cover in

case of impacts or cracks.

• Check that nuts and screws are sufciently tightened.

Weekly maintenance

• Check the starter, especially 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 lter.

Monthly maintenance

• Rinse the fuel tank with gasoline, and clean fuel lter.

• Clean the exterior of the carburetor and the space around it.

Quarterly maintenance

• Clean the cooling ns on the cylinder.

• Clean the fan and the space around it.

• Clean the mufer of carbon.

CAUTION

Cleaning of cylinder ns, fan and muf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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