Hitachi CS35EG (S), CS35EJ, CS30EG (S), CS30EJ manual Maintenance, GB-11

G B

Fig. 3-1

Fig. 3-2 Fig. 3-3

5. Maintenance

MAINTENANCE, REPLACEMENT, OR RE- PAIR OF THE EMISSION CONTROL DE- VICES AND SYSTEM MAY BE PERFORMED BY ANY NON-ROAD ENGINE REPAIR ESTABLISHMENT OR INDIVIDUAL.

Carburetor adjustment (Fig. 3-1)

WARNING!

Never start the engine without the complete clutch 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 filter is clean. When the idle speed is correct, the cutting attachment will not rotate. If adjustment is required, close (clock- wise) 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.

WARNING!

When the engine is idling the cutting attachment must under no circumstances rotate.

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.

For models that equipped with low and high speed adjustments; carburetors are pre set 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.

Air filter (Fig. 3-2)

The air filter (1) 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 filter daily or more often if working in exceptionally dusty areas.

Cleaning the air filter

Remove the air filter cover (2), the filter (1) and the sponge (3).

Rinse them m warm soap suds. Check that the filter and the sponge are dry before reassembly. An air filter that has been used for some time cannot be cleaned completely.

Therefore, it must regularly be replaced with a new one. A damaged filter must always be replaced.

Spark plug (Fig. 3-3)

The spark plug condition is influenced by:

An incorrect carburetor setting.

Wrong fuel mixture (too much oil in the gasoline)

A dirty air filter.

Hard running conditions (such as cold weather).

These factors cause deposits on the spark plug electrodes, which may result in malfunc- tion and starting difficulties. If the engine is low on power. difficult to start or runs poorly at idling speed, always check the spark plug first. If the spark plug is dirty, clean it and check the electrode gap. Readjust if necessary. The correct gap is 0.6 mm (.024″). 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.

GB-11