Hitachi CG27EJ-S - Инструкция по эксплуатации - Страница 14

GB-13

G

B

Fig.3-1

5. 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. 3-1)

      WARNING!

The cutting attachment may be spinning 

during carburetor adjustments.

      WARNING!

Never start the engine without the complete 

clutch cover and tube assembled! 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 

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 filter is clean. When the idle 

speed is correct, the cutting attachment will not 

rotate. If adjustment is required, close (clockwise) 

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 your service workshop.

NOTE!

Standard Idle rpm is 2500~3000 rpm.

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.

     WARNING!

When the engine is idling the cutting 

attachment must under no circumstances 

rotate.

Air filter (Fig. 3-2)

The air filter 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.

Fig. 3-3

Clean the air filter daily or more often if working 

in exceptionally dusty areas.

Cleaning the air filter

Remove the air filter cover and the filter (1). Rinse 

it 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.

Fuel filter (Fig. 3-2B)

Drain all fuel from fuel tank and pull fuel filter line 

from tank. Pull filter 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. 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 malfunction 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. 

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.

Fig.3-2

Fig. 3-2B