Maintenance - HIKOKI CH 24EAP(50ST) Bedienungsanleitung

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. 12)
The carburetor is a precision part that mixes air and fuel, and
it is designed to ensure high performance from the engine.
Before the tool is shipped from the factory, its carburetor is
adjusted during a test run. Only make adjustments if it is
necessary because of environmental conditions (the climate
or atmospheric pressure), the type of fuel, the type of two-
cycle oil, etc.
WARNING
○ Because the carburetor is manufactured with a high
degree of precision, do not disassemble it.
○ For this product, the only setting of the carburetor that
can be adjusted is the idle speed (T).
T = Idle speed adjustment screw.
Idle speed adjustment (T)
WARNING
○ When the engine is stopped, do not excessively turn the
idle speed adjustment screw (T) in a clockwise direction.
Otherwise, when the engine start, the cutting blade may
unexpectedly move and cause an injury.
○ Do not adjust the idle speed adjustment screw (T) for
any reason other than to adjust the idling.
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 blade is not moving.
(2) If the cutting blade moves 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 blade does not move. At that time,
ensure that the rotation of the engine is smooth.
WARNING
If the cutting blade still moves after adjustment of the
idle speed adjustment screw (T), immediately stop the
engine and cease use, then contact the nearest HiKOKI
Authorized Service Center.
Air fi lter (Fig. 13)
The air fi lter (12) 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 bolt (13), then remove the air cleaner cover and
the air fi lter (12). 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. 14)
Remove the fuel fi lter (14) from the fuel tank, and replace it
if it is dirty.
NOTE
A blocked fuel fi lter (14) can prevent the supply of fuel
and cause a rotation malfunction of the engine.
Spark plug (Fig. 15)
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.
Cutting blade
WARNING
Wear protective gloves when handling or performing
maintenance on the blade.
The blades are installed to the blade guide with the fi ve or
six bolts. Those bolts are tightened with a clearance so that
the cutters can move smoothly.
To adjust the blade clearance (Fig. 16)
1. Loosen the blade fi xing nuts (15).
2. Fully tighten the blade fi xing bolts (16) and then loosen
them approx. 3/8 turn.
3. With the bolts (16) set at that position, tighten the blade
fi xing nuts (15).
NOTE
(1) When clearance is too small
The blades do not move properly and the sliding
surfaces may seize.
(2) When clearance is too large
The blades are poor in sharpness.
CAUTION
Be sure to replace blade fi xing bolts when they are
loosened, worn or damaged. Also be sure to replace
damaged cutting blade.
Lubricating the blade (Fig. 17)
During trimming, sap adhering to the blade edge will
increase load. Use machine oil (or bicycle oil or the like)
to lubricate the blade and wipe the blade with a cloth. To
prevent the blade from rusting, be sure to lubricate the blade
after use and when it will not be used for an extended period
of time before placing it in the blade case.
Gear case (Fig. 18)
Refi ll the grease about every 20 hours of operation.
Fill a quality lithium based grease about 3g from the grease
nipple on the side of gear case (indicated by an arrow) using
a commercially available cartridge grease gun.
CAUTION
Before attempting inspection or maintenance of the gear
case, make sure the gear case has cooled.
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.
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English