Hitachi Koki CG 25EUP2 (L) Instrucciones De Manejo página 13

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. 32)
WARNING
○ The cutting attachment may be spinning during
carburetor adjustments.
○ 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 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. 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 Hitachi Authorized Service Centers.
NOTE
Standard Idle rpm is 2500 – 3500 min
WARNING
When the engine is idling the cutting attachment must
under no circumstances rotate.
Changing the engine oil
Dirty engine oil will considerably reduce the service life of the
engine. Check and change the engine oil regularly.
CAUTION
○ To avoid the risk of burn injuries, allow the engine to cool
thoroughly before changing the engine oil.
○ To prevent breakdown, ensure that no sand or dirt gets
into the tank while refueling.
When to change the oil: When fi rst using the unit, after
approximately 10 hours of operation or after 1 month,
whichever occurs earlier; subsequently, after every 50 hours
of operation or every 6 months, whichever occurs earlier.
Specifi ed engine oil: Multigrade oil of classifi cation SAE 10W-
30
Engine oil capacity: 80 ml
1. Turn off the ignition switch.
2. Check that the fuel cap is securely tightened.
3. Remove the oil cap, tilt the unit so that the oil tank
opening is on the underside and drain the engine oil into
a container. (Fig. 33)
4. When all the engine oil has been drained, place the unit
horizontally on a clean, fl at surface.
5. Fill the oil tank with engine oil up to the mouth of the oil
tank opening. (Fig. 21)
6. Tighten the oil cap securely by hand.
NOTE
○ Do not dispose of waste engine oil with garbage or into
the ground.
Dispose of the oil according to the specifi ed method in
your area.
If you are unsure, contact the retailer where the oil was
purchased.
○ Fill the oil tank with the specifi ed amount of engine oil.
Too much or too little engine oil may result in engine
breakdown.
○ Engine oil deteriorates naturally even if unused.
Change the engine oil regularly.
Air fi lter (Fig. 34)
The air fi lter (35) 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 fi lter daily or more often if working in
exceptionally dusty areas.
Cleaning the air fi lter
Remove the air fi lter cover and the fi lter (35). 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. 35)
Check the fuel fi lter occasionally for clogging as insuffi cient
fuel fl ow could aff ect engine speed.
Drain all fuel from fuel tank and pull fuel fi lter (36) from tank.
Rinse it in warm water with detergent.
Rinse thoroughly until all traces of detergent are eliminated.
Squeeze, away excess water and allow element to air dry.
.
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NOTE
If the fuel fi lter (36) is hard due to excessive dirt buildup,
replace it.
Spark plug (Fig. 36)
The spark plug condition is infl uenced by:
○ An incorrect carburetor setting.
○ A dirty air fi lter.
○ Hard running conditions (such as cold weather).
○ Too much engine oil
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.
Gear case (Fig. 37)
Check gear case or angle gear for grease level about every
50 hours of operation by removing the grease fi ller plug on
the side of gear case.
If no grease can be seen on the fl anks of the gears, fi ll the
gear case with quality lithium based multipurpose grease up
to 3/4. Do not completely fi ll the gear case.
CAUTION
○ Make sure to remove any dirt or grit when attaching the
plug to its original position.
○ Before attempting inspection or maintenance of the gear
case, make sure the case has cooled.
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English