Maintenance Schedule - Hitachi Koki CG 40EAS Instrucciones De Manejo

English
Run the engine while adjusting the idling.
(1) If the engine stops during idling
Start the engine, and slowly turn the idle speed
adjustment screw (T) in a clockwise direction until it is in
a position at which the engine rotates smoothly. At that
time, ensure that the cutting attachment is not spinning.
(2) If the cutting attachment rotates during idling
Slowly turn the idle speed adjustment screw (T) in a
counter-clockwise direction until it is in a position at
which the cutting attachment does not rotate. At that
time, ensure that the rotation of the engine is smooth.
WARNING
If the cutting attachment still rotates after adjustment of
the idle speed adjustment screw (T), immediately stop
the engine and cease use, then contact the nearest
Hitachi Authorized Service Center.
Air fi lter (Fig. 27)
The air fi lter (30) 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.
Loosen the knob (31), then open the air fi lter cover and
remove the air fi lter (30). 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. 28)
Remove the fuel fi lter (32) from the fuel tank, and replace it
if it is dirty.
NOTE
A blocked fuel fi lter (32) can prevent the supply of fuel
and cause a rotation malfunction of the engine.
Spark plug (Fig. 29)
The spark plug condition is infl uenced by:
○ An incorrect carburetor setting.
○ Wrong fuel mixture (too much oil in the gasoline)
○ A dirty air fi lter.
○ Hard running conditions (such as cold weather).
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. 30)
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.
Semi-auto cutting head
Nylon line replacement
1. Remove the case (33) by fi rmly pushing inward the
locking tabs with your thumbs as shown in Fig. 31.
2. After removing the case, take out the reel and discard
the remaining line.
3. Fold the new nylon line unevenly in half as shown in
picture.
Hook the U-shaped end of the nylon line into the groove
(34) on the center partition of the reel.
Wind both halves of the line on the reel in the same
direction, keeping each half of the line on its own side of
the partition. (Fig. 33)
4. Push each line into the stopper holes (35), leaving the
loose ends approx. 10 cm in length. (Fig. 34)
5. Insert both loose ends of the line through the cord guide
(36) when placing the reel in the case. (Fig. 35)
NOTE
When placing a reel in the case, try to line up the stopper
holes (35) with the cord guide (36) for easier line release
later.
6. Place the cover over the case so that the cap locking
tabs on the case meet the long holes on the cover. Then
push the case securely until it clicks into place.
7. The initial cutting line length should be approx. 11–14 cm
and should be equal on both sides. (Fig. 36)
Blade (Fig. 37)
WARNING
Wear protective gloves when handling or performing
maintenance on the blade.
○ Use a sharp blade. A dull blade is more likely to snag and
thrust.
Replace the fastening nut if it is damaged and hard to
tighten.
○ When replacing blade, purchase one recommended by
Hitachi, with a 25.4 mm (one inch) fi tting hole.
○ In the case of a 3 tooth blade, it can be used on either
side.
○ Use the correct blade for the type of work.
○ When replacing blades, use appropriate tools.
○ When cutting edges become dull, re-sharpen or fi le
as shown in the illustration. Incorrect sharpening may
cause excessive vibration.
○ Discard blades that are bent, warped, cracked, broken
or damaged in any way.
NOTE
When sharpening blade it is important to maintain an
original shape of radius at the base of the tooth to avoid
cracking.
For long-term storage
Drain all fuel from the fuel tank. Start and let engine run until
it stops. Repair any damage which has resulted from use.
Clean the unit with a clean rag, or the use of high pressure
air hose. Put a few drops of two-cycle engine oil into the
cylinder through the spark plug hole, and spin the engine
over several times to distribute oil.
Cover the unit and store it in a dry area.

Maintenance schedule

Below you will fi nd some general maintenance instructions.
For further information please contact Hitachi Authorized
Service Centers.
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