CG 25EUS - Hedge trimmers HITACHI - Free user manual and instructions

Product Type	Hedge Trimmer / Brush Cutter
Model	CG 25EUS
Engine Type	4-Stroke
Displacement	25 cm³
Max Engine Output	0.81 kW
Idling Speed	2800-3200 min⁻¹
Output Shaft Speed	8900 min⁻¹
Fuel Type	Unleaded Gasoline (89 octane)
Fuel Tank Capacity	500 cm³
Engine Oil Type	SAE 10W-30 Multigrade
Engine Oil Capacity	80 ml
Spark Plug	NGK CMR5H
Cutting Attachment	Nylon cord or Metal blade (255 mm diameter)
Sound Pressure Level	88 dB(A)
Guaranteed Sound Power Level	108 dB(A)
Vibration Level (Front Handle)	4.6 m/s²
Vibration Level (Rear Handle)	4.6 m/s²
Dry Weight	5.4 kg
Cutting Safety Guard	Included
Harness	Shoulder harness included
Maintenance Interval	Air filter daily, oil change after 10h (first) then every 50h
Warranty	As per local regulations

Frequently Asked Questions - CG 25EUS HITACHI

What type of fuel does the Hitachi CG 25EUS use?

The CG 25EUS uses unleaded gasoline with an octane rating of 89 or higher. It is a 4-stroke engine, so do not mix oil with the fuel. Use separate engine oil (SAE 10W-30) in the oil tank.

How do I start the hedge trimmer?

Ensure the ignition switch is ON. Push the priming bulb several times until fuel flows. Set the choke lever to START position. Pull the starter handle briskly. When the engine tries to start, return the choke to RUN and pull again. Allow 2-3 minutes warm-up before use.

What is the correct idle speed adjustment?

With the engine running, adjust the idle speed screw (T) so the cutting attachment does not rotate. Close the screw until rotation starts, then open until it stops. Correct idle speed is 2800-3200 min⁻¹.

How do I change the engine oil?

Allow the engine to cool. Turn off ignition. Remove oil cap, tilt unit to drain oil. Fill with 80 ml of SAE 10W-30 oil up to the tank opening. Replace cap. Change after first 10 hours, then every 50 hours.

What cutting attachments are compatible?

The unit accepts either a nylon cutting head (e.g., semi-auto head with 2.4-3.0 mm cord) or a metal blade (255 mm diameter, 3 or 4 teeth). Always use genuine Hitachi attachments.

How do I replace the nylon line in the semi-auto head?

Remove the case by pressing the locking tabs. Take out the reel. Fold a 2 m length of 3.0 mm cord unevenly in half. Hook the U-shape into the reel groove, wind both halves in the same direction, leaving 10 cm ends. Insert ends through cord guide, reassemble. Adjust line length to 11-14 cm.

Why does the engine start but then cut out?

Check if the fuel tank is empty or fuel is old (replace if offensive odor). Ensure choke is in RUN position. Clean or replace the fuel filter. If problem persists, contact a Hitachi Authorized Service Center.

How often should I clean the air filter?

Clean the air filter daily or more often in dusty conditions. Remove cover and filter, rinse in warm soapy water, dry completely before reassembly. Replace if damaged.

What is the correct spark plug gap?

The correct spark plug gap is 0.6 mm. Use NGK CMR5H plug. Clean or replace if dirty or eroded. Replace after approximately 100 hours of operation.

Can I use the unit without the guard?

No, the cutting attachment guard is mandatory for safety. It prevents contact with the blade and reduces the risk of thrown objects. Always ensure the guard is properly attached before use.

USER MANUAL CG 25EUS HITACHI

Technical line drawing of a mechanical clamp or clamp device with a spring scale and handle, labeled CG25EUS(L) (no other text or symbols)

Technical line drawing of a mechanical assembly with no visible text or symbols

Line drawing of a mechanical device with no visible text or symbols

Technical line drawing of a mechanical clamp or bracket assembly (no text or symbols)

Diagram showing two views of a vehicle's rear bumper with arrows indicating direction (no text or symbols)

Diagram of a mechanical device with a lever and adjustment knob, showing motion direction (no text or symbols)

Technical line drawing of a mechanical component with no visible text or symbols

Line drawing of a worker in safety gear holding equipment (no text or symbols)

Line drawing of hands using a tool to adjust or install a mechanical component (no text or symbols visible)

Technical line drawing of a mechanical assembly with no visible text or symbols

Technical diagram showing a mechanical assembly with a cylindrical component and a circular base, no text or symbols present.

SYMBOLERNAS BETYDELSE

VARNINGAR OCH SÄKERHETSINSTRUKTIONER

ADVARSLER OG SIKKERHEDSINSTRUKTIONER

Operatørsikkerhed

PROBLEML∅SNING....36

HVA ER HVA

ADVARSLER OG SIKKERHETSINSTRUKSJONER

Personlig sikkerhet

○ Bruk alltid ansiktsvern (visir) eller vernebriller.

VAROITUKSET JA TURVALLISUUSOHJEET

NOTE: Some units do not carry them.

	Symbols⚠ WARNINGThe following show symbols used for the machine. Be sure that you understand their meaning before use.
	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.		Off /Stop
			Emergency stop
	Read, understand and follow all warnings and instructions in this manual and on the unit.		Engine oil fi II
			Fuel fi II
	Always wear eye, head and ear protectors when using this unit.	[DHXX]	Idle speed adjustment
	Do not use metal/rigid blades when this sign is shown on the unit.		Priming pump
	Keep all children, bystanders and helpers 15 m away from the unit. If anyone approaches you, stop the engine and cutting attachment immediately.		Guaranteed Sound power level
	Be careful of thrown objects.		Hot surface – Contact with hot surface can cause serious burns.
	Shows maximum shaft speed. Do not use the cutting attachment whose max rpm is below the shaft rpm.		The hedge trimmer attachment cannot be used on models with this label.
	Gloves should be worn when necessary, e.g., when assembling cutting equipment.		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 difficult to see the material to be cut.
	Use anti-slip and sturdy footwear.
[S4S4]	Choke - Run position (Open)
[278C]	Choke - Start position (Closed)
###	On/Start		Indicate handle location. Do not attach handle above this point.
Before using your machineRead the manual carefully.Check that the cutting equipment is correctly assembled and adjusted.Start the unit and check the carburetor adjustment. See “MAINTENANCE”.

Contents

WHAT IS WHAT 50

WARNINGS AND SAFETY INSTRUCTIONS ....51

SPECIFICATIONS ....52

ASSEMBLY PROCEDURES 53

OPERATING PROCEDURES 53

MAINTENANCE....54

TROUBLESHOOTING....57

WHAT IS WHAT

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

1. Fuel cap
2. Throttle trigger
3. Starter handle
4. Cutting attachment guard
5. Cutting attachment
6. Drive shaft tube
7. Handle
8. Suspension eyelet
9. Ignition switch
10. Harness
11. Throttle trigger lockout
12. Choke lever
13. Engine
14. Angle transmission
15. Combi box spanner
16. Handling instructions
17. Oil cap
18. Hex. bar wrench
19. Spanner
20. Goggles
21. Blade cover (if so equipped)
22. Swivel cap
23. Cord clump (if so equipped)

WARNINGS AND SAFETY INSTRUCTIONS

Operator safety

○ Always wear a safety face shield or goggles.
○ Always wear heavy, long pants, non-slip a long sleeve shirt. Do not wear loose clothing, jewelry, short pants, sandals or go barefoot. Secure shoulder length.
Do not operate this tool when you are tired, ill or under the influence 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 acc lose your balance.

○ Never let a child or inexperienced person operate the machine.
○ Long-term exposure to noise can result in permanent hearing impairment. Wear approved hearing protection. Pay attention to your surroundings. Be aware of any bystanders who may be signaling a problem. Remove safety equipment immediately upon shutting off engine.
○ Wear head protection.
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 turned off, make sure the cutting attachment has stopped before the unit is set down.
When operation is prolonged, take a break from time to time so that you may avoid possible Hand-Arm Vibration Syndrome (HAVS) which is caused by vibration.

WARNING

○ 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 fingers. If any symptoms of the above 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 safety guard is properly attached.
○ Keep others away when making carburetor adjustments.
○ Use only accessories as recommended for this unit/machine by the manufacturer.

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 modifications 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 flames.
○ Use a container approved for 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.
○ Move at least 3 m away from fueling site before starting engine.
○ Stop engine before removing fuel cap.
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 and fuel in area where fuel vapors cannot reach sparks or open flames from water heaters, electric motors or switches, furnaces. etc.

WARNING

o o Fuel is easily to ignite or get explosion or inhale fumes, so that pay special attention when handling or filling fuel.

hair so it is above

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.
☐ 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.

○ Always keep the engine on the right side of your body.
○ Hold the unit/machine firmly with both hands.
Keep firm 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 muffler and cutting attachment when the engine is running.
○ Keep cutting attachment below knee level.
When relocating to a new work area, be sure to shut off the machine and ensure that all cutting attachments are stopped.
○ Never place the machine on the ground when running.
○ 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 first-aid kit when operating any power equipment.
Never start or run the engine inside a closed room or building and/or near inflammable liquids. Breathing exhaust fumes can kill.
○ 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.

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.

Transport and storage

○ Carry the unit/machine by hand with the engine stopped and the muffler away from your body.
○ Allow the engine to cool, empty the fuel tank, and secure the unit/machine before storing or transporting.
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, cover blade with blade cover.
☐ You have to secure the machine during transport to prevent loss of fuel, damage or injury.

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. 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.

CAUTION

Do not disassemble the recoil starter. You may get a possibility of personal injury with recoil spring.

SPECIFICATIONS

Model	CG25EUS CG25EUS (L)
Engine
Displacement ( cm^3 )	25		25
Spark plug	NGK CMR5H		NGK CMR5H
Idling speed ( min^-1 )	2800-3200		2800-3200
Speed of output shaft ( min^-1 )	8900		8900
Max. engine output (kW)	0.81		0.81
Fuel tank capacity ( cm^3 )	5		5
Engine oil capacity ( cm^3 )	8		0
Dry weight (kg) 5.4 5.2
Cutting attachment Type / Dia. (mm) Nylon cord	Metal blade / 255 Nylon cord
Sound pressure level LpA(dB (A))	(ISO22868)Equivalent*Uncertainty	883	883
Measured sound power level LwA(dB (A))	(2000/14/EC)Racing	105	102
Guaranteed sound power level LwA(dB (A))	(2000/14/EC)Racing	108	105
Vibration level ( m/s^3 ) (ISO22867)
Equivalent* (Front / Left handle)	4.6	6.5	4.8
Equivalent* (Rear / Right handle)	4.6	5.0	3.2
Uncertainty	1.5	1.5	1.5

NOTE

Equivalent noise level/vibration level are calculated as the time-weighted energy total for noise/vibration levels under various working conditions with the following time distribution:

*: 1/2 Idle, 1/2 racing

All data subject to change without notice.

ASSEMBLY PROCEDURES

Drive shaft to engine (Fig. 1)

Loosen tube locking bolt (1) so that the bolt point will not obstruct drive shaft tube to be inserted. When inserting drive shaft tube, hold the tube locking bolt outward preventing inside fitting from obstructing as well.

Insert the drive shaft into the clutch case of the engine properly until the marked position (2) on the drive shaft tube meets the clutch case.

NOTE

When it is hard to insert drive shaft up to the marked position the drive shaft tube, turn drive shaft by the cutter mounting end clockwise or counter-clockwise. Tighten tube locking bolt lining up the hole in the shaft tube. Then tighten clamp bolt securely (3).

Installation of handle

WARNING

Always use a barrier bar (4) and shoulder harness with the loop handle. (Fig. 2)

Attach the handle to the drive shaft tube with the angle towards the engine.

Adjust the location to the most comfortable position before operation.

NOTE

If your unit has handle location label on drive shaft tube, follow the illustration.

Remove the handle bracket (5) from the assembly. (Fig. 3)

Place the handles and attach the handle bracket with four bolts lightly. Adjust to appropriate position. Then attach it firmly with the bolts.

Attach the protection tube to the drive shaft or handle using cord clamps (6). (Fig. 4)

Throttle wire / stop cord (Fig. 6)

Remove air cleaner cover. (Fig. 5)

Connect stop cords. (Fig. 7)

If the throttle outer end (7) is threaded on your unit, screw it into the cable adjuster stay (8) all the way, and then tighten this cable end using the adjuster nut (9) against the cable adjuster stay (8).

Connect throttle wire end (10) to carburetor (11) and install swivel cap (if so equipped) where is included in tool bag, onto swivel.

Attach the air cleaner cover.

Installation of cutting attachment guard (Fig. 8)

NOTE

The guard bracket may come already mounted to the gear case on some models.

Install the cutting attachment guard on drive shaft tube against angle transmission. Tighten the guard bracket firmly so that the cutting attachment guard does not swing or move down during operation.

Install the cutting attachment guard to the guard bracket, which also secures the guard to the gear case using the two guard mounting screws.

WARNING

If an incorrect or faulty guard is fitted, this may cause serious personal injury.

CAUTION

Some cutting attachment guards are equipped with sharp line limiters. Be careful with handling it.

When using a trimmer head with two piece type cutting attachment guard, attach the guard extension to the cutting attachment guard. (Fig. 9)

NOTE

When attaching the guard extension to the cutting attachment guard, the sharp line limiter must be removed from the cutting attachment guard (if so installed).

☐ To remove the guard extension, refer to the drawings. Wear gloves as the extension has a sharp line limiter, then push the three square tabs on the guard one by one in order. (Fig. 10)

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.

Installation of semi-auto cutting head

1. Function

Automatically feeds more nylon cutting line when it is tapped at low rpm (not greater than 4500 min ^-1 ).

Specifications

Code No.	Type of attaching screw	Direction of rotation	Size of attaching screw
6696454	Female screw Counterclockwise M10	×P1.25-LH

Applicable nylon cord

Cord diameter: 3.0 mm Length: 2 m

Cord diameter: 2.4 mm Length: 4 m

2. Precautions

○ The case must be securely attached to the cover.
☐ Check the cover, case and other components for cracks or other damage.
○ Check the case and button for wear.

If the wear limit mark (12) on the case is no longer visible or there is a hole in the bottom (13) of the button, change the new parts immediately. (Fig. 11)

○ The cutting head must be securely mounted to the unit's gear case.
☐ For outstanding performance and reliability, always use Hitachi nylon cutting line. Never use wire or other materials that could become a dangerous projectile.
☐ If the cutting head does not feed cutting line properly, check that the nylon line and all components are properly installed. Contact Hitachi Authorized Service Centers if you need assistance.

3. Installation (Fig. 12)

○ Install cutting head on gear case of grass trimmers/brush cutters. The mounting nut (14) is left-hand-threaded. Turn clockwise to loosen/counterclockwise to tighten.

NOTE

○ Since the cutter holder cap is not used here, keep it for when a metal blade is used, if so equipped.

Insert Allen wrench (15) into the hole of the gear case in order to lock the cutter holder.

4. Adjusting line length

○ Set the engine speed as low as possible and tap the head on the ground. The nylon line will be drawn out about 3 cm with each tap. (Fig. 13) Also, you can extend the nylon line by hand but the engine must be completely stopped. (Fig. 14)
○ Adjust the nylon line to the proper length of 11–14 cm before each operation.

Installation of cutting blade (Fig. 15)

(If so equipped)

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 (16), be sure to set concave side upward.
Insert the alien wrench (15) into the hole of the angle transmission in order to lock the cutter holder (17). Please note that the cutter fixing bolt or nut (18) has left-handed threads, (clockwise to loosen/ counter-clockwise to tighten). Tighten the fixing 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 or Hitachi alloy head, use only flexible, non-metallic line recommended by the manufacturer. Never use wire or wire ropes. They can break off and become a dangerous projectile.

OPERATING PROCEDURES

Engine oil

○ Always use the specified engine oil (multigrade oil of classification SAE 10W-30). Insufficient engine oil or using engine oil other than the specified type may cause breakdown of the unit.

Filling up with engine oil

○ Place the unit horizontally on a clean, flat surface.
○ Remove the oil cap and check whether the engine oil comes up to the mouth of the oil tank opening. (Fig. 16)
☐ If the oil level is low or when using the unit for the first time, fill the tank with engine oil up to the mouth of the oil tank opening.
○ If the engine oil is conspicuously dirty or discolored, change the oil.
○ Tighten the oil cap securely after fueling.
When using the unit for the first time, change the engine oil after running the engine for approximately 10 hours. Subsequently, change the oil after every 50 hours of operation.

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.

Fuel

WARNING

○ Provide good ventilation, when fueling or handling fuel.
☐ Fuel contains highly flammable and it is possible to get the serious personal injury when inhaling or spilling on your body. Always pay attention when handling fuel. Always have good ventilation when handling fuel inside building.
○ Always use branded 89 octane unleaded gasoline.
○ Do not use a mixture of gasoline and engine oil as this may lead to starter failure or power reduction.

Fueling

WARNING

○ Always shut off the engine before refueling.
○ Slowly open the fuel tank, when filling up with fuel, so that possible over-pressure disappears.
○ Tighten the fuel cap carefully, after fueling.
○ Always move the trimmer at least 3 m from the fueling area before starting.
○ Always wash any spilled fuel from clothing imme soap.
○ Be sure to check for any fuel leakage after refueling.

Before fueling, clean the tank cap area carefully, to ensure that dirt falls into the tank.

Starting

CAUTION

Before starting, make sure the cutting attachment does not touch anything.

1. Set ignition switch (19) to ON position. (Fig. 17)
   * Push priming bulb (20) several times so that fuel flows through the bulb or return pipe. (Fig. 18)
2. Set choke lever (21) to START position (closed) (A) (Fig. 19)
3. Pull recoil starter briskly, taking care to keep the handle in your grasp and not allowing it to snap back.
4. When you hear the engine want to start, return choke lever to RUN position (open) (B). Then pull recoil starter briskly again.

NOTE

If engine does not start, repeat procedures from 2 to 4.

1. After starting engine, then allow the engine about 2–3 minutes to warm up before subjecting it to any load.
2. Check that the cutting attachment does not rotate when the engine is idling.

Cutting (Fig. 20, 21, 22)

☐ When cutting, operate engine at over 6500 min ^1 . Extended time of use at low rpm may wear out the clutch prematurely.
○ Cut grass from right to left.
○ 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 difficult to see the material to be cut.

☐ Wear the harness as shown in the figure (if so equipped). The blade turns counter-clockwise, therefore, be advised to operate the unit from right to left for efficient cutting. Keep onlookers out of working area at least 15 m.
○ Use in accordance with local laws and regulations.

NOTE

Press the quick release button or pull emergency release flap (If so equipped) in the event of emergency.

WARNING

If cutting attachment should strike against stones or other debris, stop the engine and make sure that the attachment and related parts are undamaged. When grass or vines wrap around attachment, stop engine and attachment and remove them.

Stopping (Fig. 23)

Decrease engine speed and run at an idle for a few minutes, then turn off ignition switch (19).

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.

Semi-auto cutting head

○ When cutting, operate engine at over 6500 min ^1 . Extended time of use at low rpm may wear out the clutch prematurely.
○ Cut grass from right to left.

WARNING

A cutting attachment can injure while it continues to spin after diately with 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.

at no Automatically feeds more nylon cutting line when it is tapped at low rpm (not greater than 4500 min ^-1 ).

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. 24)

WARNING

○ The cutting attachment may be spinning during carburetor adjustments.
Never start the engine without the complete fan case 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 Hitachi Authorized Service Centers.

NOTE

Standard Idle rpm is 2800–3200 min ^-1 .

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 first 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.

Specified engine oil: Multigrade oil of classification SAE 10W-30 Engine oil capacity: 80 ml

1. Tum 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. 25)
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. 16)
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 specified method in your area.
If you are unsure, contact the retailer where the oil was purchased.
○ Fill the oil tank with the specified 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 filter (Fig. 26)

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

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 (22). 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. 27)

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. 28)

The spark plug condition is influenced by:

○ An incorrect carburetor setting

○ A dirty air fi Iter

○ 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 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.

Angle transmission (Fig. 29)

Check angle transmission or angle gear for grease level about every 50 hours of operation by removing the grease filler plug on the side of angle transmission.

If no grease can be seen on the flanks of the gears, fill the transmission with quality lithium based multipurpose grease up to 3/4. Do not completely fill the transmission.

Semi-auto cutting head

Nylon line replacement

(1) Remove the case (23) by firmly pushing inward the locking tabs with your thumbs as shown in Fig. 30.
(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 (24) on the center partition of the reel. Wind both halves of the line on the reel in the same direct keeping each half of the line on its own side of the partition. (Fig. 31)
(4) Push each line into the stopper holes (25), leaving the loose ends approx. 10 cm in length. (Fig. 32)
(5) Insert both loose ends of the line through the cord guide (26) when placing the reel in the case. (Fig. 33)

NOTE

When placing a reel in the case, try to line up the stopper holes (25) with the cord guide (26) 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. (Fig. 34)
(7) The initial cutting line length should be approx. 11–14 cm and should be equal on both sides. (Fig. 35)

Blade (Fig. 36)

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) fitting hole.
○ In the case of a 3 tooth blade (27), 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 file 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 c shape of radius at the base of the tooth to avoid cracking.

Maintenance schedule

Below you will find 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 centred, sharp, and without cracks. An off-centre cutting attachment induces heavy vibrations that may damage the unit.
○ Check that the cutting attachment nut is sufficiently tightened.
○ Make sure that the blade transport guard is undamaged and that it can be securely fitted.
○ Check that nuts and screws are sufficiently tightened.
○ Check the volume and condition of the engine oil.
○ 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 it and check the electrode gap. Adjust it to 0.6 mm, or change the spark plug.
○ Check that the angle gear is filled with grease up to 3/4.
○ Clean the air fi Iter.

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.

List of recommended accessories

Type Name		Specifi cation LOOP HANDLE BIKE HANDLE
		Diameter	Feed System Adapter or No. of Teeth (Blade)	Blade Thickness (mm) or Trimmer line Diameter (mm)	CG25EUS (L)	CG25EUS
ALUMINUM HEADS	NYLON HEAD CH-100 (W/NYLON LINE)	4" Pre-Cut Line 2.2 – 3.0			●	●
	NYLON HEAD CH-100				●	●
	NYLON HEAD CH-300 (W/CUTTER HOLDER CAP)	5" Manual line feed 2.2 – 2.7
	NYLON HEAD CH-300
TAP & GO NYLON HEADS	NYLON HEAD BF-5	5"	LM10 x 1.25 Nut LM8 x 1.25	2.2 – 3.0	●	●
BLADES	BLADE B3/10/2.0	10"	3	2.0		●
	BLADE B3/12/3.0	12"	3	3.0
	BLADE B4/9/1.6	9"	4	1.6		●
	BLADE B4/10/1.6	10"	4	1.6		●

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
Engine does not start	Fuel system	Fuel tank is empty or fuel level is low Fill the fuel	tank
		Fuel tank contains old fuel (offensive odor) Replace with new fuel
		Too much fuel is absorbed and spark plug is wet	1. Disconnect the spark plug and allow to dry2. Pull the starter handle 5 or 6 times to remove the surplus fuel3. Attach the spark plug4. Set the choke lever to RUN position and pull the starter handle
		Fuel filter is clogged with dirt	Clean the fuel filter
		Fuel pipe is bent or disconnected	Ensure that the fuel flows smoothly
		Carburetor malfunction Contact Hitachi Authorized Service Centers
	Electrical system	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	Reconnect
		Electrical system malfunction Contact Hitachi Authorized Service Centers
	Other Muffler exhaust port is clogged with carbon		Contact Hitachi Authorized Service Centers for repair
Engine starts but cuts out straightawayEngine is apt to cut out	Fuel system	Fuel tank is empty or fuel level is low	Fill the fuel tank
		Fuel tank contains old fuel (offensive odor) Replace with new fuel
		Engine 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
	Electrical system	Ignition failure
		Spark plug failure	Replace with new spark plug
		Electrical system failure	Contact Hitachi Authorized Service Centers
	Other	Engine overheating
		Wrong spark plug model	Replace with designated partSee “SPECIFICATIONS”
		Dirty air cleaner	Clean
		Carbon clogging (muffler exhaust port)	Clean
		Insuffi cient compression (piston, piston ring, cylinder)	Contact Hitachi Authorized Service Centers
Abnormal vibration		Cutting attachment is not properly installed	See “Installation of cutting attachment”
		Handle, handle bracket or other fastening part is loose	Check and tighten
		Blade is bent or damaged	Replace with new blade
		Grass is wrapped round gear case	Remove grass
Engine is running but cutting attachment does not move Movement is poor		Grass is wrapped round gear case	Remove grass and dirt
Engine does not stop		Stop switch failure	Set the choke lever to START position to stop the engineCease use immediately and contact Hitachi Authorized Service Centers

Condition Cause Remedy
Engine stops when throttle is closed Idle speed is too low Contact Hitachi Authorized Service Centers
Cutting attachment continues rotating when throttle is closed	Idle speed is too high Throttle wire is too taut	Contact Hitachi Authorized Service Centers

Line drawing of a quill pen in an inkwell (no text or symbols)

Line drawing of a quill pen in an inkwell (no text or symbols)

Svenska EF-DEKLARATION BETRÄFFANDE LIKFORMIGHET Suomi		EY-ILMOITUS YHDENMUKAISUUDESTA
(Gäller endast Europa)Vi kungör härmed på eget ansvar att denna produkt överensstämmer med Direktiv 2006/42/EC, 2004/108/EC och 2000/14/EC.Vi har tagit hänsyn till följande standards.ISO 7112/7113/7916/7918/8380/11682(EN ISO 12100-2, EN ISO 11806: 2011)Bilaga V (2000/14/EC): För information rörande buller, se kapitelbeskrivningen.Den europeiska standardansvarige på Hitachi Koki Europe Ltd. är auktoriserad att utarbeta den tekniska fi len.Denna deklaration gäller för CE märkningen påprodukten.		(Koskee vain Eurooppaa)Ilmoitamme yksinomaisella vastuullamme, että tämä tuote on direktiivien 2006/42/EY, 2004/108/EY ja 2000/14/EY vaatimusten mukainen.Seuraavat standardit on huomioitu.ISO 7112/7113/7916/7918/8380/11682(EN ISO 12100-2, EN ISO 11806: 2011)Liite V (2000/14/EC): Katso melupäästöihin liittyviä tietoja kappaleesta ominaisuudet.Hitachi Koki Europe Ltd.:n eurooppalaisten standardien johtaja on valtuutettu laatimaan tekniset asiakirjat.Tämä ilmoitus sovelletaan tuotekohtaiseen CE merkintään.
Dansk	EF-OVERENSS TEMMELSESERKLÆRING English	EC DECLARATION OF CONFORMITY
(Gælder kun for Europa)Vi erklærer os fuldstændig ansvarlige for, at dette produkt er i overensstemmelse med direktiverne 2006/42/EF, 2004/108/EF og 2000/14/EF.De følgende standarder har været iagttaget.ISO 7112/7113/7916/7918/8380/11682(EN ISO 12100-2, EN ISO 11806: 2011)Appendiks V (2000/14/EF): For information vedrørende støjafgivelse henvises til afsnittet Specifi kationer.Chefen for europæiske standarder hos Hitachi Koki Europe Ltd. er autoriseret til at kompilere den tekniske fi I.Denne erklæring gælder produkter, der er mærket med CE.		(Applies to Europe only)We declare under our sole responsibility that this product is in conformity with directives 2006/42/EC, 2004/108/EC and 2000/14/EC.The following standards have been taken into consideration.ISO 7112/7113/7916/7918/8380/11682(EN ISO 12100-2, EN ISO 11806: 2011)Annex V (2000/14/EC): For information relating to noise emissions, see the chapter specifi cations.The European Standards Manager at Hitachi Koki Europe Ltd. is authorized to compile the technical fi le.This declaration is applicable to the product affi xed CE marking.
Norsk	EF'S ERKLÆRING OM OVERENSSTEMMELSE
(Gjelder bare for Europa)Vi erklærer at det er vårt avsvar at dette produktet er i overensstemmelse med direktiv 2006/42/EC, 2004/108/EC og 2000/14/EC.Det er tatt hensyn til følgende standarder.ISO 7112/7113/7916/7918/8380/11682(EN ISO 12100-2, EN ISO 11806: 2011)Anneks V (2000/14/EC): For informasjon relatert til lydemisjon, se kapittel spesifi kasjonene.Lederen for europeiske standarder ved Hitachi Koki Europe Ltd. har fullmakt til å utarbeide det tekniske dokumentet.Denne erklæringen gjelder produktets påklistrede CE merking.
Representative offi ce in EuropeHitachi Power Tools Europe GmbHSiemensring 34, 47877 Willich 1, F. R. GermanyTechnical fi le at:Hitachi Koki Europe Ltd.Clonshaugh Business & Technology Park, Dublin 17, IrelandHead offi ce in JapanHitachi Koki Co., Ltd.Shinagawa Intercity Tower A, 15-1, Konan 2-chome,Minato-ku, Tokyo, Japan		CE28.9.2014A. YoshidaA. YoshidaVice-President & Director

Hitachi Koki Co., Ltd.