Hitachi Koki CG 25EUS L Handbuch

[ NEW FEATURES ]

Small OHV Four-stroke Engine

Lightest weight in its Class

Smallest engine in its Class

PRODUCT NAME

Hitachi Engine Grass Trimmer

Models CG 25EUS (L)

CG 25EUS

The newly released CG 25EUS Engine Grass Trimmer is Hitachi Koki group first tool equipped with a small four-

cycle engine. There is now a growing need for tools equipped with a small, low-exhaust four-cycle engine as

environmentally friendly products.

With the new Model CG 25EUS, we aim to enhance the market share of Hitachi’s engine grass trimmer series.

LIST Nos.

CG 25EUS: E071

May. 2010

Cutting grass:

•Cutting grass in fields

•Cutting undergrowth in orchards

•Cutting other general kinds of grass

MARKETING OBJECTIVE

APPLICATIONS

SELLING POINTS

Sales Division

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

CG 25EUS (L)

REMARK:

• For more information about HANDLING INSTRUCTIONS, visit our website at:

http://www.hitachi-koki.com/manual_view_export/

• Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s) is(are) used in the place of

company name(s) and model name(s) of our competitor(s). The symbol(s) utilized here is(are) as follows:

Competitors

Symbols Utilized

Company Name Model Name

A HONDA UMK 425LE

B Makita EM 4251

CONTENTS

Page

SELLING POINTS -------------------------------------------------------------------------------------------------------------1

SPECIFICATIONS -------------------------------------------------------------------------------------------------------------2

COMPARISON WITH SIMILAR PRODUCTS ---------------------------------------------------------------------------3

PRECAUTIONS ON SALES PROMOTION -----------------------------------------------------------------------------4

1. Safety Instructions ----------------------------------------------------------------------------------------------- 4

2. Specific Instructions for Customers -------------------------------------------------------------------------- 5

TROUBLESHOOTING GUIDE --------------------------------------------------------------------------------------------- 6

REPAIR GUIDE -----------------------------------------------------------------------------------------------------------------8

1. Precautions on Maintenance, Inspection and Repair --------------------------------------------------- 8

2. Inspection Criteria for Each Section and Consumable Parts ----------------------------------------- 8

Assembly Diagram for CG 25EUS

-1-

Small OHV Four-stroke Engine

The Model CG 25EUS comes equipped with the first small four-cycle engine among grass trimmers

produced by the Hitachi Koki group.

Thanks to the use of this four-cycle engine with low gas emissions, the Model CG 25EUS complies with

secondary exhaust regulations in Europe and the USA.

Compared with models equipped with a two-cycle engine, the Model CG 25EUS reduces noise by 3 dB and

engine oil consumption by 80 percent.

•Low gas emissions

Exhaust regulation

(g/kWh) CG 25EUS (L)

THC + NOx 50 or less 32

•Comparison of engines

HITACHI

CG 25EUS (L)

(four-cycle engine)

HITACHI

CG 24EKS

(two-cycle engine)

Engine oil consumption (mL/h) 3.0 15.0

Idling (dB) 70.6 76.3

Racing (dB) 90.6 96.8

Noise level at

operator's ear

Equivalent

mean

(dB) 87.0 94.0

Lightest Weight in its Class

The Model CG 25EUS features the lightest weight in its class of engine grass trimmers.

HITACHI

CG 25EUS (L) AB

Dry weight (kg)

(catalog data/

measured data)

5.0/5.0 5.2/5.46 5.2/–

Smallest Engine in its Class

The Model CG 25EUS features the smallest engine in its class of engine grass trimmers.

HITACHI

CG 25EUS (L) AB

Engine volume (L) 4.7 4.9 4.8

SELLING POINTS

-2-

Model CG 25EUS (L) CG 25EUS

Engine type Forced air-cooling, four-cycle OHV engine (type F25)

Engine displacement 25 mL

Cylinder size

(inner diameter x stroke) Ф35 x 26 mm

Max. power output 0.81 kW (1.1 hp) / 7,500 min-1

Max. rpm speed 9,500 to 11,500 min-1

Idling speed 2,500 to 3,500 min-1

Applicable fuel Unleaded regular gasoline for automobiles

Applicable engine oil SAE10W-30 oil of API SF or higher class

(Four-stroke engine oil for automobiles)

Fuel tank capacity Other than U.S.A.: 550 mL U.S.A.: 500 mL

Engine oil tank capacity 80 mL

Starting method Recoil starter

Ignition Fly-wheel magnet type

Spark plug NGK CMR-5H

Carburetor Diaphragm (with primer pump)

Stop switch Rocker type switch

Throttle lever Trigger type

Carrying Shoulder carrying (single strap)

Handle Loop Handle Bike Handle

Cutter blades Nylon cutter

Blade rotation Counterclockwise when viewed from the top

Power transmission Via automatic centrifugal clutch

Dimensions (L x W x H) 1,790 x 393 x 296 mm 1,790 x 750 x 525 mm

Dry weight 5.0 kg 5.2 kg

Accessories

Nylon cutter *3blade、*Cuter Case

*Shoulder belt、*Protection goggles

Tool set

*: Other than U.S.A.

SPECIFICATIONS

-3-

(Superior specifications: )

Maker HITACHI

Model CG 25EUS (L) A B

Engine type – Forced air-cooling

four-cycle OHV

Forced air-cooling

four-cycle OHC

Forced air-cooling

four-cycle OHV

Engine

displacement mL 25 25 24.5

Max. power output kW 0.81 (1.1 hp) 0.81 (1.1 hp) 0.7 (0.9 hp)

Secondary exhaust

regulation mL

Other than U. S. A. : 550

U. S. A. : 500 550 500

Engine oil tank

capacity mL 80 80 80

Gas emission (THC +

NOx)

g/kWh

32 25 32

Fuel consumption

g/kWh

450 460 440

Oil consumption mL/h 3.0 2.6 –

(Front

handle) 4.8 5.8 5.2

Vibration

level (Rear

handle)

m/s2

3.2 8.3 5.6

Noise level dB (A) 87 91 87

Engine volume L 4.7 4.9 4.8

Outer dimensions

(L x W x H) mm 1,790 x 393 x 296 1,770 x 368 x 305 1,760 x 330 x 265

Mass (catalog data /

measured data) kg 5.0/5.0 5.2/5.46 5.2/–

COMPARISONS WITH SIMILAR PRODUCTS

-4-

1.Safety Instructions

In the interest of promoting the safest and most efficient use of the Model CG 25EUS Engine Grass

Trimmer by all of our customers, it is very important when concluding a sale that the salesperson carefully

ensure that the customer seriously recognizes the importance of the Handling Instructions and precautions

indicated on the Caution Plate and Name Plate attached on the product.

For how to handle, maintain, inspect, and store the Model CG 25EUS Engine Grass Trimmer, refer to the

Handling Instructions, and instruct the customer on proper use, particularly how to conduct periodic

inspection. Also pay attention to the supply system for consumables and the system for product repair.

A. Handling Instructions

Although every possible effort has been made in the design, manufacturing, and testing phases to ensure

the safety of the Model CG 25EUS Engine Grass Trimmer, this product inevitably involves an inherent risk

in use. To avoid unnecessary risk and ensure that the customer uses the product safely and efficiently, the

Handling Instructions describe safety precautions specific to the Model CG 25EUS Engine Grass Trimmer.

Therefore, when concluding a sale, make sure that the customer carefully reads the safety precautions,

and give the customer appropriate guidance.

B. Caution Plate

The Name Plate and Caution Plate attached on the Model CG 25EUS Engine Grass Trimmer describe

precautions on the safe use of the product.

[For Western and Northern Europe]

[For North America]

[For Western Europe and Northern Europe]

[For North America]

PRECAUTIONS ON SALES PROMOTION

-5-

2. Specific Instructions for Customers

(1) Proper startup and stopping procedures

Thoroughly instruct the customer on how to start and stop this tool. With regard to startup, make sure

that the customer fully understands the difference in startup procedure between two situations when the

engine is cold and when it has been warmed up.

(2) Proper fuel mixture

This tool is equipped with a four-cycle gasoline engine. Instruct the customer to only use unleaded

regular gasoline for this tool. Using an alcohol-blended fuel for this tool may damage the engine and

fuel line.

Also instruct the customer not to use a mixture of gasoline and engine oil as fuel. Using such a mixture

as fuel may cause startup failure, reduce power output, and clog the fuel line.

(3) Proper engine oil

This tool requires engine oil in addition to fuel.

•Instruct the customer to use SAE 10W-30 oil, which is intended for four-cycle engines.

•Because this tool is shipped without engine oil, instruct the customer to supply engine oil to this tool

before use.

•Instruct the customer to always check the engine oil level before using this tool, and replenish the

engine oil tank whenever the engine oil level is low.

•Instruct the customer to replace engine oil after about 10 hours of initial operation when using this tool

for the first time, and then replace engine oil after every 50 hours of subsequent operation.

•Note that more engine oil than normal is consumed during the initial 10 hours of operation.

(4) Proper storage

Instruct the customer to remove fuel from the fuel tank and continue idling operation until the engine

stops in order to remove fuel from inside the carburetor when not using this tool for a long time. Using

old fuel may cause tool failure.

Instruct the customer to store this tool with its main pipe positioned horizontally or lean it against a

structure with its cutter facing up for storage. Storing this tool with its cutter facing down may cause

engine oil to leak. Also instruct the customer to use sufficient care when leaning this tool against a

structure, in order to prevent it from falling down.

(5) Exclusive use of genuine cutter blades

Fully inform the customer of the applicable standard (M10 left-handed thread at pitch of 1.25) for nylon

head attachment, outer cutter blade diameter (max. Ф230 mm),and the type of cutter blade. Using an

incompatible cutter blade may not only shorten the tool’s service life but also result in an accident.

-6-

Situation Cause Measure

The piston ring is stuck.

The connecting rod bearing is

stuck

Disassemble the engine and

replace the faulty part

A valve is damaged Replace the faulty part

Starter handle

cannot be

pulled

The crankshaft does

not rotate

The crank gear or cam gear is

damaged Replace the faulty part

The fuel tank is empty Replenish the fuel tank with

fuel

The fuel filter is clogged Clean or replace the part

The air hole in tank cap is faulty Replace the faulty part

The carburetor is clogged with

foreign matter Clean the part

The plug does not

become wet with fuel

after repeated startup

operation

Throttle operation is

inappropriate

Perform appropriate startup

operation

The spark plug is stained or

faulty Clean or replace the part

The spark plug cap is not

properly connected Inspect and replace the part

The high-voltage cord or other

cable broke, or its connection is

faulty

Repair or replace the part

The high-voltage cord or other

cable is grounded Repair the part

No spark

The ignition coil broke or is

faulty Replace the faulty part

Short-circuited due to foreign matter between the plug

electrodes

Remove the foreign matter.

If this problem recurs often,

disassemble the engine and

clean the parts

The piston ring is faulty

The piston is worn

A cam is damaged

The crank gear or cam gear is

damaged

Replace the faulty part

Startup is

impossible

No compression

Carbon accumulated on a

valve Clean the part

The spark plug is stained or

faulty Clean or replace the part

Weak spark The air gap between the

magneto rotor and ignition coil

is faulty

Perform adjustment

The piston ring is worn Replace the faulty part

Low compression Carbon accumulated on a

sealed valve surface Clean the part

The idling speed is too low Perform adjustment

Idling stops

although

startup is

possible

Good spark and

compression The carburetor is clogged with

foreign matter

Disassemble the engine and

clean the part

TROUBLESHOOTING GUIDE

-7-

Situation Cause Measure

The fuel filter is clogged Clean or replace the part

Loose nuts Repair the parts

The engine stalls

Worn push rod

Worn valve

Worn pivot

Worn rocker arm

Valve

clearance is

extended

Worn tappet

Replace the faulty part

The muffler is clogged with

carbon

The air cleaner is clogged

Starts, but when

it accelerates…

Poor acceleration;

no increase in rpm

Carbon accumulated on a

valve

Clean the part

Fluctuating rpm at

high speed

The carburetor is clogged with

foreign matter Clean the part

Starts, but … Excessive fuel

consumption The air cleaner is clogged Clean the part

The piston ring is worn

The cylinder is worn

The piston is deformed

Chain oil is not discharged

The oil seal is worn or

damaged

Replace the faulty part

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