Hitachi CG 24EC, CG 27EC, CG 24ECM, CG 27ECM Handling Instructions Manual

Page 1

Grass Trimmer/Brush Cutter Model

CG 24EC (S) / CG 24ECM (S) CG 27EC (S) / CG 27ECM (S)

Handling instructions

CG24ECM (S)

Note: Before using this machine, carefully read through these HANDLING INSTRUCTIONS to ensure eﬃ cient, safe operation. It is recommended that these INSTRUCTIONS be kept readily available as an important reference when using this machine.

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CG24EC(S) CG27EC(S)

J O

Q SR

1/3

2/3

CG24ECM(S) CG27ECM(S)

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456

789

10 11

12 13 14

Page 4

15 16 17

18 19 20

21 22

CG24EC / CG27EC

23 24 25

CG24ECM / CG27ECM

0.6 mm

Page 5

26 27

Page 6

MEANINGS OF SYMBOLS

NOTE: Some units do not carry them.

Symbols

WARNING

The following show symbols used for the machine. Be sure that you understand their meaning before use.

Grass Trimmer / Brush Cutter Priming pump

It is important that you read, fully understand and observe the following safety precautions and warnings. Careless or improper use of the unit may cause serious or fatal injury.

Read, understand and follow all warnings and instructions in this manual and on the unit.

Always wear eye, head and ear protectors when using this unit.

Do not use metal/rigid blades when this sign is shown on the unit.

Keep all children, bystandards and helpers 15 m away from the unit. If anyone approaches you, stop the engine and cutting attachment immediately.

Be careful of thrown objects.

Shows maximum shaft speed. Do not use the cutting attachment whose max rpm is below the

-1

min

shaft rpm.

Gloves should be worn when necessary, e.g., when assembling cutting equipment.

Guaranteed sound power level

Blade thrust may occur when the spinning blade contacts a solid object in the critical area. A dangerous reaction may occur causing the entire unit and operator to be thrust violently. This reaction is called blade thrust. As a result, the operator may lose control of the unit which may cause serious or fatal injury. Blade thrust is more likely to occur in areas where it is diﬃ cult to see the material to be cut.

Hot Surface – Contact with hot surface can cause serious burns.

The hedge trimmer attachment cannot be used on models with this label.

Indicate handle location. Arrows which show limits for handle positioning.

Displacement

Spark plug

Use anti-slip and sturdy footwear.

Choke – Run position (Open) Speed of output shaft

Choke – Start position (Closed)

On/Start Fuel tank capacity

Oﬀ /Stop

Emergency stop Cutting attachment

Fuel and oil mixture

Idle speed adjustment

ISO22868

WA, Ra(M)

2000/14/EC

Idling speed

Idle

Max. engine output

Dry weight (without fuel, cutting attachment, harness and cutting attachment guard)

Sound pressure level LpA by ISO 22868

pA, eq

Equivalent*

Measured sound power level LwA by 2000/14/ EC Racing

Page 7

WA, Ra(G)

2000/14/EC

hv, eq(F)

Before using your machine

• Read the manual carefully.

• Check that the cutting equipment is correctly assembled and adjusted.

• Start the unit and check the carburetor adjustment. See “MAINTENANCE”.

NOTE: Equivalent noise level / vibration level are calculated as the time-weighted energy total for noise / vibration levels

* 1/2 Idle, 1/2 racing.

Guaranteed sound power level LwA by 2000/14/ EC Racing

Vibration level by ISO 22867 Front or Left handle / Equivalent*

under various working conditions with the following time distribution:

hv, eq(R)

Vibration level by ISO 22867 Rear or Right handle / Equivalent*

Uncertainty

WHAT IS WHAT? (Fig. 1)

Since this manual covers several models, there may be some diﬀ erence between pictures and your unit. Use the instructions that apply to your unit.

A: Fuel cap B: Throttle trigger C: Starter handle D: Cutting attachment guard E: Cutting attachment F: Drive shaft tube G: Handle H: Hanger I: Ignition switch J: Harness (if so equipped) K: Throttle trigger lockout L: Choke lever M: Engine N: Gear case O: Combi box spanner P: Handling instructions Q: Goggles R: Hex bar wrench S: Blade cover (if so equipped)

WARNINGS AND SAFETY INSTRUCTIONS

Pay special attention to statements preceded by the following words:

WARNING

Indicates a strong possibility of severe personal injury or

loss of life, if instructions are not followed.

CAUTION

Indicates a possibility of personal injury or equipment

damage, if instructions are not followed.

NOTE

Helpful information for correct function and use.

Operator safety

○ Wear head protection (1). (Fig. 2) ○ Always wear a safety face shield or goggles (2). (Fig. 2) ○ Wear approved hearing protection (3). (Fig. 2)

Long-term exposure to noise can result in permanent

hearing impairment.

Pay attention to your surroundings. Be aware of any

bystanders who may be signaling a problem.

Remove safety equipment immediately upon shutting oﬀ

engine.

○ Always wear heavy, long-sleeved shirts (4) and long

pants (5) and non-slip boots (6) and gloves (7). (Fig. 2)

Do not wear loose clothing, jewelry, short pants, sandals

or go barefoot.

Secure hair so it is above shoulder length.

○ Do not operate this tool when you are tired, ill or under

the inﬂ uence of alcohol, drugs or medication.

○ Do not operate the tool at night or under bad weather

conditions when visibility is poor. And do not operate the tool when it is raining or right after it has been raining.

Working on slippery ground could lead to an accident if

you lose your balance.

○ Never let a child or inexperienced person operate the

machine.

○ Do not start the engine if there are any ﬂ ammables such

as dry leaves, waste paper or fuel in the vicinity.

○ Never start or run the engine inside a closed room or

building. Breathing exhaust fumes can kill.

○ Keep handles free of oil and fuel. ○ Keep hands away from cutting equipment. ○ Do not grab or hold the unit by the cutting equipment. ○ Gloves should be worn when installing or removing the

cutting attachment. Failure to do so may result in injury.

○ When the unit is shut oﬀ , make sure the cutting

attachment has stopped before the unit is set down.

○ When operation is prolonged, take a break periodically

so that you may avoid possible Hand-Arm Vibration Syndrome (HAVS) which is caused by vibration.

WARNING

○ Always operate the tool with proper protective equipment

and clothing. Failure to do so may result in accidents such as burns or injuries. (Fig. 2)

○ Do not touch the spark plug area or high voltage during

operation. Doing so may result in electric shock.

○ Do not allow children near the tool during operation. ○ Do not touch the engine, muﬄ er cover or exhaust vent

during or shortly after operation. Doing so may result in burn or injury.

○ Antivibration systems do not guarantee that you will

not sustain Hand-Arm Vibration Syndrome or carpal tunnel syndrome. Therefore, continual and regular users should monitor closely the condition of their hands and ﬁ ngers. If any of the above symptoms appear, seek medical advice immediately.

○ If you are using any medical electric/electronic devices

such as a pacemaker, consult your physician as well as the device manufacturer prior to operating any power equipment.

Unit/machine safety

○ Inspect the entire unit/machine before each use.

Replace damaged parts. Check for fuel leaks and make sure all fasteners are in place and securely tightened.

○ Replace parts that are cracked, chipped or damaged in

any way before using the unit/machine. Faulty parts may increase the risk of accidents and may lead to an injury.

○ Make sure the cutting attachment guard and harness are

properly attached. Do not operate if cutting attachment guard and harness is not properly attached.

○ Keep others away when making carburetor adjustments. ○ Use only accessories as recommended for this unit/

machine by the manufacturer.

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○ Before operation, make sure that there are no tools such

as the adjustment key or spanner still attached to the unit.

WARNING

○ Never modify the unit/machine in any way. Do not use

your unit/machine for any job except that for which it is intended.

○ Non-authorized modiﬁ cations and/or accessories may

result in serious personal injury or the death of the operator or others.

Fuel safety

○ Mix and pour fuel outdoors and where there are no

sparks or ﬂ ames.

○ Use a container approved for fuel. ○ Move at least 3 m away from fueling site before starting

engine.

○ Stop engine before removing fuel cap. Do not remove

the fuel cap during operation.

○ Empty the fuel tank before storing the unit/machine. It is

recommended that the fuel be emptied after each use. If fuel is left in the tank, store so fuel will not leak.

WARNING

○ Fuel is easy to ignite or get explosion or inhale fumes, so

that pay special attention when handling or ﬁ lling fuel.

○ Do not smoke or allow smoking near fuel or the unit/

machine or while using the unit/machine.

○ Wipe up all fuel spills before starting engine. ○ Store unit/machine and fuel in area where fuel vapors

cannot reach sparks or open ﬂ ames from water heaters, electric motors or switches, furnaces. etc.

○ When using the unit in dry areas, make sure that ﬁ re

extinguishing equipment is readily available.

○ If you shut oﬀ the engine for refueling, make sure the unit

has cooled down before adding fuel.

Cutting safety

○ Do not cut any material other than grass and brush. ○ Inspect the area to be cut before each use.

Remove objects which can be thrown or become

entangled.

Do not operate in areas where there are tree roots or

rocks.

○ For respiratory protection, wear an aerosol protection

mask when cutting the grass after insecticide is scattered.

○ Keep others including children, animals, bystanders and

helpers outside the 15 m hazard zone. Stop the engine immediately if you are approached.

○ Please exercise caution as engine startup may be

delayed after pulling the starter handle.

○ Always keep the engine on the right side of your body. ○ Hold the unit/machine ﬁ rmly with both hands. ○ Keep ﬁ rm footing and balance. Do not over-reach.

Losing your balance during work may lead to an injury. ○ Keep all parts of your body away from the muﬄ er and

cutting attachment when the engine is running.

○ Keep cutting attachment below knee level. ○ Please exercise caution when operating in areas where

electrical cables or gas pipes are present.

○ Do not operate the cutting attachment for anything but

clearing grass or bushes. Avoid operations where the cutting attachment may touch water such as puddles or dig into dirt. Failure to do so may result in injury or damage to the unit.

○ Avoid prolonged use at low speed range in which

vibration is high. Doing so may result in engine damage.

○ When relocating to a new work area, or inspecting,

adjusting or exchanging the unit’s cutting attachments, accessories, etc., be sure to shut oﬀ the machine and ensure that all cutting attachments are stopped.

○ Never place the machine on the ground when running.

○ Never touch the cutting attachment when it is rotating. ○ Always ensure that the engine is shut oﬀ and any cutting

attachments have completely stopped before clearing debris or removing grass from the cutting attachment.

○ Always carry a ﬁ rst-aid kit when operating any power

equipment.

○ Turn oﬀ the engine and make sure the cutting attachment

has come to a full stop before removing the unit from your body or before leaving the unit unattended.

○ If you accidentally bump or drop the unit, inspect it

immediately to make sure there are no damage, cracks or deformations.

○ If the tool is operating poorly and produces strange noise

or vibrations, turn oﬀ the engine immediately and ask your dealer to have it inspected and repaired.

Continued use under these conditions could lead to

injury or tool damage.

○ Use in accordance with local laws and regulations.

WARNING

KICKBACK DANGER (Fig. 3)

When using metal cutting attachments such as blades,

contact with obstacles such as trees or other hard surfaces with the front or right portion of the spinning attachment may force the unit to catch on an obstacle, resulting in a kickback reaction towards the right side of the operator.

Kickback may occur when the cutting attachment comes

into contact with tree stumps or rocks hidden behind weeds. Always make sure there are no obstacles hidden by weeds before starting work.

To minimize the danger of kickbacks when they do occur,

always position the unit to the right side of the body during operation. With the operator properly positioned as the cutting attachment rotates, this will reduce the danger of the unit’s direct contact with the body.

Maintenance safety

○ Maintain the unit/machine according to recommended

procedures.

○ Disconnect the spark plug before performing

maintenance except for carburetor adjustments.

○ Keep others away when making carburetor adjustments. ○ Use only genuine HITACHI replacement parts as

recommended by the manufacturer.

CAUTION

Do not disassemble the recoil starter. There is a

possibility of personal injury with recoil spring.

WARNING

Improper maintenance could result in serious engine

damage or in serious personal injury.

Transport and storage

○ Carry the unit/machine by hand with the engine stopped

and the muﬄ er away from your body.

○ Allow the engine to cool, empty the fuel tank, and secure

the unit/machine before storing or transporting. Failure to do so may result in ﬁ re or accidents.

○ Empty the fuel tank before storing the unit/machine. It is

recommended that the fuel be emptied after each use. If fuel is left in the tank, store so fuel will not leak.

○ Store unit/machine out of the reach of children. ○ Clean and maintain the unit carefully and store it in a dry

place.

○ Make sure engine switch is oﬀ when transporting or

storing.

○ When transporting and storing, either remove the cutting

attachment or place the blade cover over the blade.

○ You have to secure the machine during transport to

prevent loss of fuel, damage or injury.

○ If a warning label cannot be read, peels oﬀ or becomes

indistinct, replace it with a new one. To purchase new labels, contact Hitachi Authorized Service Centers.

Page 9

If situations occur which are not covered in this manual, take care and use common sense. Contact Hitachi Authorized Service Centers if you need assistance.

SPECIFICATIONS

The SPECIFICATIONS of this machine are listed in the table on page 16.

NOTE

All data subject to change without notice.

ASSEMBLY PROCEDURES

Installation of handle (Fig. 4)

Remove the handle bracket (8) from the assembly. Place the handle and attach the handle bracket with four

bolts lightly. Adjust to appropriate position. Then attach it ﬁ rmly with the bolts.

Installation of harness

(If so equipped)

WARNING

If the product includes a harness, always make sure to

use it.

Attach the harness hook (9) to the hanger (10) on the drive shaft tube. (Fig. 5) Adjust the length of the harness for easy operation of the tool.

NOTE

You may need to adjust the position of the hangar (10)

to balance the unit. To do so, loosen bolt (11) and adjust the position of hangar (10). After adjusting as necessary, make sure to securely tighten the bolt (11). (Fig. 5)

Installation of cutting attachment guard

WARNING

If an incorrect or faulty guard is ﬁ tted, this may cause

serious personal injury.

CAUTION

Some cutting attachment guards are equipped with

sharp line limiters. Be careful with handling it.

NOTE

The guard bracket may come already mounted to the

gear case on some models.

Align the cutting attachment guard with the guard bracket and secure it to the drive shaft tube, using the bolt and cover bracket. (Fig. 6)

WARNING

Remove the guard extension when using metal or plastic

blades. Failure to do so may result in injury or damage to the cutting attachment guard.

NOTE

To remove the guard extension, refer to the drawings.

Wear gloves as the extension has a sharp line limiter.

Loosen the bolt (12). Then push the three square tabs on

the guard one by one in order. (Fig. 7)

Installation of cutting attachment

WARNING

○ Install the cutting attachment properly and securely as

instructed in the handling instructions.

If not attached properly or securely, it may come oﬀ and

cause serious and/or fatal injury.

○ Do not install or remove cutting attachments while the

engine is running.

○ Always use genuine Hitachi cutting attachments and

metal ﬁ ttings.

Installation of cutting blade

CG24EC (S) / CG27EC (S) (Fig. 8) Insert the alien wrench (13) into the hole of the gear case in order to lock the shaft. Assemble in the following order: Cutter holder (A) (14), blade (15), cutter holder (B) (16), nut cover (17). Tighten the ﬁ xing nut with the box wrench. Please note that the cutter ﬁ xing nut (18) has left-handed threads (clockwise to loosen/ counter-clockwise to tighten).

NOTE

○ When installing cutter holder (B) (16), be sure to set

concave side upward.

○ When installing or removing a blade, make sure to wear

gloves and place the blade cover over the blade.

CAUTION

Check a nut cover (17) for wear or cracks before

operation. If any damage or wear is found, replace it, as it is an article of consumption.

WARNING

○ When installing a cutting blade, make sure that there are

no cracks or any damage in it and that the cutting edges are facing the correct direction.

○ Remove any surface grit from blade installation ﬁ ttings

(cutter holder (A) (14), cutter holder (B) (16), nut cover (17), nut (18)). Failure to do so may result in the loosening of nuts.

○ The protrusion of the cutter holder (A) (14) may become

misaligned with the blade (15) while tightening nut (18). Before operation, make sure the blade has been properly installed. (Fig. 9)

○ Rotate the blade by hand and make sure there is no

rocking or abnormal noise. Rocking may cause abnormal vibrations or result in the loosening of nuts.

CG24ECM (S) / CG27ECM (S) (Fig. 10) When installing a cutting blade, make sure that there are no cracks or any damage in it and that the cutting edges are facing the correct direction.

NOTE

○ When installing cutter holder cap (19), be sure to set

concave side upward.

○ Press the stopper pin (20) of the angle transmission in

order to lock the cutter holder (21). Please note that the cutter ﬁ xing bolt or nut (22) has left-handed threads, (clockwise to loosen/ counter-clockwise to tighten). Tighten the ﬁ xing bolt or nut with the box wrench.

CAUTION

○ Before operation, make sure the blade has been properly

installed.

○ If your unit is equipped with protection cover under a

cutting blade, check it for wear or cracks before operation. If any damage or wear is found, replace it, as it is an article of consumption.

○ You have to wear gloves when handling the cutting

blade.

WARNING

For Hitachi heads, use only ﬂ exible, non-metallic line

recommended by the manufacturer. Never use wire or wire ropes. They can break oﬀ and become a dangerous projectile.

OPERATING PROCEDURES

Fuel (Fig. 11)

WARNING

○ The trimmer is equipped with a two-stroke engine.

Always run the engine on fuel, which is mixed with oil.

Provide good ventilation, when fueling or handling fuel.

Page 10

○ Fuel is highly ﬂ ammable and it is possible to get seriously

injured when inhaling or spilling on your body.

Always pay attention when handling fuel. Always have

good ventilation when handling fuel inside building.

Fuel

○ Always use branded 89 octane unleaded gasoline. ○ Use genuine two-cycle oil or use a mix between 25:1 to

50:1, please consult about the mixture ratio to Hitachi Authorized Service Centers.

○ If genuine oil is not available, use an anti-oxidant added

quality oil expressly labeled for air-cooled 2-cycle engine use (JASO FC GRADE OIL or ISO EGC GRADE). Do not use BIA or TCW (2-stroke water-cooling type) mixed oil.

○ Never use multi-grade oil (10 W/30) or waste oil. ○ Never mix fuel and oil in machine’s fuel tank. Always mix

fuel and oil in a separate clean container. Always start by ﬁ lling half the amount of gasoline, which is to be used. Then add the whole amount of oil. Mix (shake) the fuel mixture. Add the remaining amount of gasoline. Mix (shake) the fuel-mix thoroughly before ﬁ lling the fuel tank.

Mixing amount of two-cycle oil and gasoline

Gasoline (Liter)

0.5 10 ——— 20

1 20 ——— 40

2 40 ——— 80

4 80 ——— 160

Fueling

WARNING

○ Always shut oﬀ the engine and let it cool for a few

minutes before refueling. Do not smoke or bring ﬂ ames or sparks near the fueling

site. ○ Slowly open the fuel tank, when ﬁ lling up with fuel, so

that possible over-pressure disappears.

○ Tighten the fuel tank cap carefully, after fueling. ○ Always move the unit at least 3 m from the fueling area

before starting. ○ Always wash any spilled fuel from clothing immediately

with soap.

○ Be sure to check any fuel leakage after refueling. ○ Before fueling, in order to remove static electricity from

the main body, the fuel container and the operator,

please touch the ground that is slightly damp. Before fueling, clean the tank cap area carefully, to ensure that no dirt falls into the tank. Make sure that the fuel is well mixed by shaking the container, before fueling.

Starting

WARNING

○ Before starting the tool, ensure that the cutting

attachment is not touching any objects or the ground.

Otherwise, the cutting attachment may unexpectedly

rotate and cause an injury. ○ Ensure that the cutting attachment does not rotate while

the engine is idling. If it does rotate, adjust the idle speed

according to the instructions in “Idle speed adjustment” in

the “MAINTENANCE” section. If the cutting attachment

still rotates after this adjustment, immediately stop the

engine and cease use, then bring the tool to the nearest

Hitachi Authorized Service Center.

CAUTION

For the CG24EC / CG27EC, ensure that the throttle

outer end is in the holder.

Two-cycle oil (ml)

Ratio 50:1 Ratio 25:1

(1) Starting the cold engine

1. Set ignition switch (23) to ON position. (Fig. 12)

2. Push priming bulb (24) several times so that fuel ﬂ ows through return pipe (25). (Fig. 13)

3. Set choke lever (26) to START position (closed) (A). (Fig. 14)

4. Pull recoil starter briskly, taking care to keep the handle in your grasp and not allowing it to snap back. (Fig. 15)

5. When you hear the engine want to start, return choke lever to RUN position (open) (B). (Fig. 14)

6. Pull recoil starter briskly again. (Fig. 15)

NOTE

If engine does not start, repeat procedures from 2 to 5.

7. Then allow the engine about 2–3 minutes to warm up before subjecting it to any load.

8. Check that the cutting attachment does not rotate when the engine is idling.

(2) Starting the warm engine Use only 1, 2, 6 and 8 of the starting procedure for a cold

engine.

If the engine does not start, use the same starting

procedure as for a cold engine.

Cutting

WARNING

○ Always use the harness (if so equipped) and wear the

proper attire and protective equipment when operating the unit. (Fig. 16)

○ Keep others including children, animals, bystanders and

helpers outside the 15 m hazard zone. Stop the engine immediately if you are approached. (Fig. 17)

○ When grass or vines wrap around attachment, stop

engine and attachment and remove them. Continuing operation with grass or vines wrapped around the attachment may result in damages such as early abrasion of the clutch.

CAUTION

Use and points of caution will vary depending on the type

of cutting attachment. For safe use, make sure to follow the instructions and guidelines provided with each type.

NOTE

○ Press the quick release button or pull emergency release

ﬂ ap (If so equipped) in the event of emergency. (Fig. 18)

○ Use in accordance with local laws and regulations.

CG24ECM/CG27ECM only

● Governor mechanism

The tool is equipped with a feature that keeps the engine

rotation speed consistent at the speed that is set. This maintains a stable engine rotation speed even when the burden applied to the tool bit becomes large, allowing for steady operation.

However, if a burden larger than the tolerance is applied,

the engine rotation will decrease; in this case, adjust the burden by decreasing the amount of material being cut.

The governor mechanism does not function when the

throttle is fully open.

Using a blade ○ Adjust engine speed according to the resistance of the

grass. For soft grass, use low speeds, For tough clumps of grass, use high speeds.

○ Cut grass from right to left, using the left side of the blade

to cut. (Fig. 19)

○ Slightly tilting the blade to the left while cutting will pile

the cut grass to the left, making collection easy.

NOTE

Excessively increasing rotation speed may cause

increased blade wear, vibration and noise. It will also result in increased fuel consumption.

Page 11

WARNING

○ Blade thrust may occur when the spinning blade contacts

a solid object in the critical area.

A dangerous reaction may occur causing the entire unit

and operator to be thrust violently. This reaction is called blade thrust. As a result, the operator may lose control of the unit which may cause serious or fatal injury. Blade thrust is more likely to occur in areas where it is diﬃ cult to see the material to be cut.

○ If cutting attachment should strike against stones or

other debris, stop the engine and make sure that the attachment and related parts are undamaged.

Stopping (Fig. 20)

Decrease engine speed and run at an idle for a few minutes, then turn oﬀ ignition switch (23).

WARNING

A cutting attachment can injure while it continues to spin

after the engine is stopped or power control is released. When the unit is turned oﬀ , make sure the cutting attachment has stopped before the unit is set down.

Throttle adjustment knob (Fig. 21)

The cutting blade speed setting for when the throttle trigger is fully pulled can be adjusted. To increase the speed setting, turn the throttle adjustment knob (27) clockwise, and to decrease the speed setting, turn the knob counter-clockwise.

WARNING

○ While operating the tool, do not make adjustments using

one hand.

○ Hold the tool securely and pull the throttle trigger while

ensuring that the cutting blade is not touching the ground or any objects.

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. 22)

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 twocycle 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).

○ Never start the engine without the complete clutch cover

and tube assembled! Otherwise the clutch can come loose and cause personal injuries.

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 starts, the cutting attachment may unexpectedly rotate 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 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. 23)

The air ﬁ lter (28) 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 screw (29), then open the air ﬁ lter cover and remove the air ﬁ lter (28). 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. 24)

Remove the fuel ﬁ lter (30) from the fuel tank, and replace it if it is dirty.

NOTE

A blocked fuel ﬁ lter (30) can prevent the supply of fuel and cause a rotation malfunction of the engine.

Spark plug (Fig. 25)

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. 26)

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.

Page 12

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.

Blade (Fig. 27)

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 or 4 tooth blade (31), 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.

Daily maintenance

○ Clean the exterior of the unit. ○ Check that the harness is undamaged. ○ Check the cutting attachment guard for damage or

cracks. Change the guard in case of impacts or cracks.

○ Check that the cutting attachment is properly centered,

sharp, and without cracks. An oﬀ -center cutting attachment induces heavy vibrations that may damage the unit.

○ Check that the cutting attachment nut is suﬃ ciently

tightened.

○ Make sure that the blade cover is undamaged and that it

can be securely ﬁ tted.

○ Check that nuts and screws are suﬃ ciently tightened. ○ Check that the unit is undamaged and free of defects.

Weekly maintenance

○ Check the starter, especially the cord and return spring. ○ Clean the exterior of the spark plug. ○ Remove the spark plug and check the electrode gap.

Adjust it to 0.6 mm, or change the spark plug.

○ Check that the angle gear is ﬁ lled with grease up to 3/4. ○ Clean the air ﬁ lter.

Monthly maintenance

○ Rinse the fuel tank with gasoline. ○ Clean the exterior of the carburetor and the space

around it.

○ Clean the fan and the space around it.

SELECTING ACCESSORIES

The accessories of this machine are listed on page 17.

Page 13

SELECTING CUTTING ATTACHMENTS

Recommended accessories for each model are presented in the table below. For purchases, contact Hitachi Authorized Service Centers. Please check carefully as those accessories not marked with “

List of recommended accessories

Name

●” cannot be attached.

Speciﬁ cation BIKE HANDLE

BLADE B4/9/1.6

BLADE B4/10/1.6

BLADE B3/10/1.8

Diameter

No. of Teeth (Blade)

Feed System Adapter

Blade Thickness (mm)

9” 4 1.6

10” 4 1.6

10” 3 1.8

(mm)

Trimmer line Diameter

CG24EC (S)

●●

CG24ECM (S)

CG27EC (S)

CG27ECM (S)

Page 14

TROUBLESHOOTING

Use the inspections in the table below if the tool does not operate normally. If this does not remedy the problem, consult your dealer or the Hitachi Authorized Service Center.

Condition Cause Remedy

Fill the fuel tank with the correct fuel mix (25:1-50:1)

Replace with new fuel

Disconnect the spark plug and allow to dry

2. Pull the starter handle 5 or 6 times to remove the surplus fuel

3. Attach the spark plug

4. Set the choke lever to RUN position and pull the starter handle

Reconnect

Contact Hitachi Authorized Service Centers for repair

Fill the fuel tank with the correct fuel mix (25:1-50:1)

Replace with new fuel

Replace with designated part See “SPECIFICATIONS”

Contact Hitachi Authorized Service Centers

See “Installation of cutting attachment”

Check and tighten

Fuel system

Engine does not start

Electrical system

Other

Fuel system

Engine starts but cuts out straightaway

Engine is apt to cut out

Abnormal vibration

Engine is running but blade does not move

Movement is poor

Electrical system

Other

Fuel tank is empty or fuel level is low

Fuel tank contains old fuel (offensive odor)

Too much fuel is absorbed and spark plug is wet

Fuel ﬁ lter is clogged with dirt Clean the fuel ﬁ lter

Fuel pipe is bent or disconnected Ensure that the fuel ﬂ ows smoothly

Carburetor malfunction Contact Hitachi Authorized Service Centers

Stop switch lead has short-circuited Contact Hitachi Authorized Service Centers

Spark plug is dirty Replace or clean the spark plug

Electrode gap is too big Adjust the gap to 0.6mm

Poor connection between high tension cable and spark plug

Electrical system malfunction Contact Hitachi Authorized Service Centers

Mufﬂ er exhaust port is clogged with carbon

Fuel tank is empty or fuel level is low

Fuel tank contains old fuel (offensive odor)

Two-cycle oil has not been added Contact Hitachi Authorized Service Centers

Choke lever is in START position Set the choke lever to RUN position

Air has got into fuel system Reconnect the fuel pipe or joint

Carburetor malfunction Contact Hitachi Authorized Service Centers

Ignition failure

Spark plug failure Replace with new spark plug

Electrical system failure Contact Hitachi Authorized Service Centers

Engine overheating

Wrong spark plug model

Dirty air cleaner Clean

Carbon clogging (mufﬂ er exhaust port) Clean

Insufﬁ cient compression (piston, piston ring, cylinder)

Cutting attachment is not properly installed

Handle, handle bracket or other fastening part is loose

Blade is bent or damaged Replace with new blade

Grass is wrapped round gear case Remove grass

Grass is wrapped round gear case Remove grass and dirt

Page 15

Condition Cause Remedy

Set the choke lever to START position to

Engine does not stop Stop switch failure

Engine stops when throttle is closed

Blade continues rotating when throttle is closed

Idle speed is too low

Idle speed is too high Throttle wire is too taut

stop the engine Cease use immediately and contact Hitachi Authorized Service Centers

Contact Hitachi Authorized Service Centers

Page 16

Model

CG24EC (S) CG24ECM (S) CG27EC (S) CG27ECM (S)

pA, eq

ISO22868

WA, Ra(M)

2000/14/EC

WA, Ra(G)

2000/14/EC

Idle

Max.

9,900

/ K

(cm3)

—

(min-1)

(min-1) 9900

-1

min

(min-1) 7500

(kW) 0.72 0.81

(cm3) 400

(kg) 4.2 4.4 4.2 4.4

(— / mm)

(dB(A))

23.9 26.9

TORCH L7RTC (NGK BPMR7A)

2800 – 3200

255 255

85 / 3 85 / 3

105 105

107 107

hv, eq(F)

hv, eq(R)

/ K

(m/s2)

4.4 / 1.5 4.3 / 1.5 4.2 / 1.5 4.1 / 1.5

4.3 / 1.5 4.1 / 1.5 3.9 / 1.5 3.9 / 1.5

Page 17

6684764

944458

875769

6698711

6699756 6696184

171819

Page 18

Page 19

Page 20

Hitachi Koki Co., Ltd.

Shinagawa Intercity Tower A, 15-1, Konan 2-chome,

Minato-ku, Tokyo, Japan

606 Code No. E99703312 NA Printed in China