Hitachi CS30EH - Инструкция по эксплуатации - Страница 12

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Fig. 3-1

Fig. 3-3

Fig. 3-2

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.

5. Maintenance

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) and the filter (1). 
Rinse them in warm soap suds. Check that the 
filter is 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.

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