Hitachi CS 51EA User Manual

Chain Saw Model CS 51EA

Handling instructions

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.

English

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. 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 warni ngs and instructions in this manual and on the unit.

Emergency stop

Fuel and oil mixture

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

Warni ng, kickback danger. Be careful of possible sudden and accidental upward and/or backward motion of the guide bar.

One-handed usage not permitted. While cutting, hold saw ﬁ rmly with both hands with thumb ﬁ rmly locked around front handle.

Chain brake Carburetor adjustment - High speed mixture

Choke Oil pump adjustment

On/Start Priming pump

Oﬀ /Stop Decompression valve

Contents

WHAT IS WHAT? .............................................................................. 3

WARNINGS AND SAFETY INSTRUCTIONS .................................. 3

SPECIFICATIONS ............................................................................ 5

ASSEMBLY PROCEDURES ............................................................. 5

OPERATING PROCEDURES ........................................................... 6

MAINTENANCE .............................................................................. 10

Parts breakdown

Chain oil ﬁ ll

Carburetor adjustment - Idle speed

Carburetor adjustment - Low speed mixture

English

WHAT IS WHAT?

1. Throttle lever: Device activated by the operatorʼs ﬁ nger, for controlling the engine speed.

2. Throttle lever lockout: Device that prevents the accident al operation of the throttle lever until manually released.

3. Stop switch: Device for allowing the engine to be started or stopped.

4. Oil tank cap: For closing

5. Recoil starter: Pull handle to start the engine.

6. Front handle: Suppor t handle located at or towar ds the front of the engine housing.

7. Fuel tank cap: For closing the fuel tank.

8. Choke lever: Device for enriching the fuel/air mixture in the carburetor, to aid

9. Priming pump; Device for supplying extra fuel, to aid starting.

10. Decompression va lve: Device for reducing the compression pressure to aid starting.

11. Guide bar: The part that supports and guides the saw chain.

12. Saw chain: Chain, serving as a cutting tool.

13. Cha in brake (Fro nt hand guard): the chain.

14. Spiked bumper: Device for acting as a pivot when in contact with a tree or log.

15. Cha in catcher: Device for restraining the saw chain.

16. Guide bar cover: Device for covering the guide bar and saw chain when the unit is not

17. Combi box spanner: The tool for removing or installing a spark plug and tensioning the saw chain.

18. Handling instructions: Included with unit. Read before operation and keep for future reference to learn proper, safe techniques.

the oil tank.

starting.

Device for stopping or locking

being used.

WARNINGS AND SAFETY INSTRUCTIONS

Operator safety

○ Always wear a safety face shield or goggles. ○ Gloves should be used when sharpening chain. ○ Always wear safety protective equipment such as jacket,

trousers, gloves, helmet, boots with steel toe-caps and non-slip soles, and eye, ear and leg protection equipment whenever you use a chain saw. For suitable for climbing techniques. Do not wear loose clothing, jewelry, short pants, sandals or go barefoot.

Secure hair so it is above shoulder length. ○ Do not operate this too l when you are tired, ill or under the

inﬂ uence of alcohol, drugs

○ Never let a child or inexperienced per son operate the machine. ○ Wear hearing protection. Pay attention to your surroundings.

Be aware of any bystanders who may be signaling a problem. Remove safet y equipment immediately upon shutting oﬀ engine.

○ Wear head protection. ○ Never start or run the engine

Breathing exhaust fumes can kill.

○ For respirator y protection, wea r a protection mask while emitting

the chain oil mist and dust from sawdust.

○ Keep handles free of oil and fuel. ○ Keep hands away from cutting equipment. ○ Do not grab or hold the unit by ○ When the unit turned o ﬀ , make sure the cut ting attachment has

stopped before the unit is set down.

working in trees the safet y boots must be

or medication.

inside a closed room or building.

the cutting equipment.

○ When operation is prolonged, take a break from time to time

so that yo u may avoid possible Hand-Arm Vibration Syndrome (HAVS) which is caused by vibration. The operator must obey the local regulations of cutting area.

○

WARNING

○ Antivibration systems do not guarantee that yo u will not sustain

Hand-Arm Vibration Syndrome or carpal tunnel syndr ome.

Therefore, continual end regular users should monitor closely

the condition of their hands and ﬁ ngers. If any of the above symptoms appear, seek medical advice immediately.

○ Long or continuous ex posure to high

permanent hearing impairment. Always wear approved hearing protection when operating a unit/machine.

○ 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

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.

○ Make sure the side case is properly attached. ○ Keep others away when making carburetor ○ Use only accessories as recommended for this unit/machine by

the manufacturer.

○ Never let the chain strike any obstacle. If the chain makes

contact, the machine should be stopped and checked carefully.

noise levels may cause

each use. Replace

adjustments.

English

○ Make sure the automatic oiler is working. Keep the oil tank ﬁ lled

with clean oil. Never let chain run dry on the bar.

○ All chain saw service, other than the items listed in the

operatorʼs/ ownerʼs manual, should be performed by competent chain-saw service personnel. (For example, used to remove the ﬂ y wheel or if an improper tool is used to hold the ﬂ ywheel in order to remove the clutch, structural damage to the ﬂ ywheel could occur and could subsequently cause the ﬂ ywheel to burst.)

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.

○ Never use chain saw without any safety equipment or that has

faulty safety equipment. It could result in serious personal injury.

○ Using guide bar/chain other than

manufacturer which are not approved, could result in a high risk of personal accidents or injury.

Fuel safety

○ Mix and pour fuel outdoors and where there are no sparks or

ﬂ ames.

○ Use a container approved for fuel. ○ Do not smoke or allow smoking near fuel 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 and let it cool for a few minutes before removing fuel

tank cap.

○ Empty the fuel tank before storing

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 ﬂ ames from water heaters, electric motors or switches, furnaces, etc.

WARNING

Fuel is easy to ignite or get explo sion or inhale fumes, so that pay

special attention when handling or ﬁ lling fuel.

Cutting safety

○ Do not cut any material oth er than wo od or wooden objects. ○ For respiratory protection, wear an aerosol protection mask

when cutting the wood after insecticide has

○ Keep others in cluding children, animals, by standers and helpers

outside the hazard zone. Stop the engine immediately if yo u are approached.

○ Hold the unit/machine ﬁ rmly with the right hand on the rear

handle and the left hand on the front handle.

○ Keep ﬁ rm footing and balance. Do not ○ Keep all parts of your body away from the muﬄ er and cutting

attachment when the engine is running.

○ Keep Bar/Chain below waist level. ○ Before felling a tree, the operator must be accustomed to the

sawing techniques of the chain saw.

○ Be sure to pre-plan a safe ○ While cutting, hold the unit/machine ﬁ rmly with both hands with

thumb ﬁ rmly locked around front handle, and stand with feet well balanced and your body balanced.

○ Stand to the side of the saw when cutting - never directly behind

it.

○ Always keep the spiked

chain may suddenly be drawn into a tree, if so equipped.

○ When completing a cut, be ready to hold up the units as it breaks

into clear, so it will not fol low through and cut yo ur legs, feet or body, or contact an

○ Be alert again st kickback (when saw kicks up and back at

operator). Never cut with the nose of the bar.

○ When relocating to a new work area, be sure to shut oﬀ the

machine and ensure that all cut ting at tachments are stopped.

○ Never place the machine on the ○ 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.

exit from a failing tree.

bumper face to a tree, because the

obstruction.

ground when running.

if improper tool s are

recommended by the

the unit/machine or

the unit/machine. It is

been applied.

over-reach.

○ Never star t or run the engine inside a closed room

and/or near the inﬂ ammable liquid. Breathing exhaust fumes can kill.

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

the manufacturer.

CAUTION

Do not disassemble the recoil starter. You may get a possibilit y

of personal injury with recoil spring.

WARNING

Improper maintenance could result in serious engine damage or

in serious personal injury.

Tra ns po rt 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

○ 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 ○ Make sure stop switch is oﬀ when transporting or storing. ○ When transporting or storage, cover chain with guide bar cover.

If situations occur which are not covered in this manual, take care and use common sense. Contact HITACHI dealer if you 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.

WARNING

KICKBACK DANGER (Fig. 1)

One of the most severe dangers when work ing with a chain saw is the possibility of kickback. Kickback may occur when the upper tip of the guide bar touches an object, or when the woo d closes in and pinches the saw chain in the cut. Tip contact cause a lightning fast reverse reaction, kicking the guide bar up and back toward yo u. Pinching the saw chain along the top of the guide bar may also push the guide bar rapidly back towar ds you. Either of these reactions may cause you to lose control result in serious personal injury. Even though your saw has safety built into its design, you should not rely on these safety featu res exclusive ly. Know where your bar tip is at all times. Kickback does occur if you allow the kickback zone (1) of the bar Do not use that area. Kickback from pinching is caused by a cut closing and pinching the upper side of the guide bar. Study your cut and make sure it will open as you cut through. Maintain control when the engine is running by always keeping your right hand on the rear handle, your left hand on the front handle and your thumbs and ﬁ ngers encircling the handles. Always hold the saw with both hands during operation and cut at high engine speed. Follow manufacturer's sharpening and maintenance instructions

the saw chain. The lack of this maintenance may increase the

for possibility of kickback.

transporting in a vehicle.

carefully and store it in a dry place.

of the saw which could

a ﬁ rm grip on the saw with

Fig. 1

or building

need assistance.

in some cases may

to touch an object.

English

SPECIFICATIONS

○ Code “CS” of model name means “Chain saw”

Typ e of equipment Chain saw, portable

Engine Size (cm

Spark Plug NGK BPMR-7A

Fuel Ta nk Capacity (cm

Chain Oil Tan k Capacity (cm

Dry Weight (kg) (Without guide bar and chain)

) 50.1

)530

)270

Chain pitch (mm) 8.26

Chain gauge (mm) 1.2 7

Sound pressure level LpA (d B (A)) by ISO 22868

Equivalent Uncertainty

Sound power level Lw A (dB (A)) by ISO 22868 Measured

Sound power level Lw A (dB (A)) by 2000/14/EC Measured Guaranteed

Vibration level (m/s Front handle Rear handle Uncertainty

) by ISO 22867

Guide bar length (mm) 400 450 500

Typ e of chain

Max. engine power by ISO 7293 (kW)

Max. engine speed (min

Idle engine speed (min

Speciﬁ c fuel consumption at maximum engine power (g/kWh)

-1

)13500

-1

) 3000

Max. chain speed (m/sec) 26.0

Sprocket (numbe r of teeth) 7

NOTE: Eq uivalent noise level/vibration levels are calculated as the time-weighted energy tot al for noise/vibration levels under various

working conditions with the following time distribution: 1/3 idle, 1/3 full, 1/3 racing speed. *Al l data subject to change without notice.

Model CS51EA (40S) CS51E A (45S) CS51E A (50S)

5.1

104

Uncertainty

3.3

2.7

0.8

95VPX

(Oreg on)

113

114 117

3.3

2.7

0.8

2.5

439

3.3

2.7

0.8

20BPX

(Oreg on)

ASSEMBLY PROCEDURES

WARNING

Never try to start engine without side case, bar and chain

securely fastened.

1. Pull the front hand guard (2) toward the front handle to check that the chain brake is disengaged. (Fig. 2)

Fig. 2

2. Remove guide bar clamp nuts (3). Remove the side case (4) . (Fig. 3)

Fig. 3

English

the guide bar (5 ) onto the bolts (6), then push it toward the

3. Install sprocket (7) as far as it will go.

4. Conﬁ rm the direction of saw chain (12) is correct as in the ﬁ gure, and align the chain on the sprocket. (Fig. 5)

5. Guide the chain drive links into the bar groove all around the bar.

6. Install the side case (4) onto the bolts (6).

Make sure that the boss of chain tension adjust bolt (8) ﬁ ts into

the hole (9) of the bar. (Fig. 4)

The brake lever

the side of the front hand guard.

Then tighten the guide bar clamp nuts (3) by hand that allows the

guide bar end to move up and down easily.

7. Raise the bar end, and tighten the chain (12) by turning the tension adjustment bolt (13) clockwise. To check proper ten sion, lightly lift up the center of chain and there should be about 0.5 – 1.0 mm clearance (14) between bar and edge of drive link. (Fig. 6, 7)

0.5 – 1 mm

Fig. 4

Fig. 5

(11) of the side case must ﬁ t the groove (10) on

Fig. 6

Fig. 7

(

Fig. 3

)

CAUTION

PROPER TENSION IS EXTREMELY IMP ORTANT

8. Raise the bar end and securely tighten the guide bar clamp nuts with the combi box spanner. (Fig. 7)

9. A new chain will stretch so adjust the chain after a few cuts and watch chain tension carefully for the ﬁ rst half hour of

NOTE

Check the chain tension frequently for optimum performance

and durability.

CAUTION

○ When the chain is excess ively tightened, the bar and chain will

be damaged rapidly. Conversely, when the chain is excessive ly loosened, it may get out of the groove in the bar.

○ Always wear gloves when touching the chain.

WARNING

During operation, hold chain saw ﬁ rmly with both hands. A single

hand operation may cause serious injury.

cutting.

OPERATING PROCEDURES

Fuel (Fig. 8)

Fig. 8

WARNING

○ The chain saw is equipped with a two-stroke engine. Always

run the engine on fuel, which is mixed with oil. Provide good ventilatio n, when fueling or handling fuel.

○ Fuel contains highly ﬂ ammable and it is possible to get the

serious personal injury when inhaling or spilling on you r body. Always pay attention when handling fuel. Always have good ventilatio n 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 the oil bottle for the ratio or HITACHI dealer.

○ If genuine oil

oil express ly labeled for air-cooled 2-cycle engine use (JASO FC GRADE OIL or ISO EG C GRADE). Do not use BIA or TCW (2-str oke water-cooling type) mixed oil.

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

Always start by ﬁ lling half the amount of gasoline, which is to be used. Then add the whole amount of oil. Mix (sh ake) the fuel mixture. Add the remaining amount of gasoline. Mix (shak e) the fuel-mix thoroughly before ﬁ lling the fuel tank.

Fuelin g

WARNING (Fig. 9)

○ Always shut oﬀ the engine before refueling. ○ Slowly open the fuel tank (15), when ﬁ lling up with fuel, so that

possible overpressure disappears.

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

starting.

○ Always

soap.

○ Be sure to check any fuel leaking after refueling. 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.

is not availabl e, use an anti-oxidant added quality

a separate clean container.

wash any spilled fuel from clothing immediately with

English

Fig. 9

Chain oil (Fig. 9)

Fill up with chain oil (16) . Always use good quality chain oil. When the engine is running, the chain oil is automatically discharged.

NOTE

When pouring fuel (15) or chain oil (16 ) into the tank, place the

unit with cap side up. (Fig. 9)

ADJUSTMENT

The chain oil quantity discharged through the lubrication system is adjusted to the maximum in the factory. Adjust the quantity in accordance with the operating condition. Tur n the adjusting screw (17 ) counterclockwise to increase the quantity and turn it clockwise to decrease the quantit y. (Fig. 10)

Chain brake operation (Fig. 2, 11)

Chain brake is designed to activate in an emergency such as kickback action. Application of brake is made by moving the front hand guard towards the bar. During the chain brake operation, even if the throttle lever is pulled, the engine speed does not turn. To release the brake, pull the front hand guard toward the front handle. If the engine keeps rotating at high speed with the brake engaged, the clutch will overheat causing trouble. When the brake engages during operation, immediately release the throttle lever to slow

How to conﬁ rm the activation of the chain brake

1) Tur n o ﬀ the engine.

2) Holding the chain saw horizontally, release your hand from the front handle, hit the tip of the guide bar to a stump or a piece of wood, and conﬁ rm brake operation. bar size.

OF CHAIN OIL SUPPLY

Fig. 10

not increase and the chain does

down the engine.

Operating level varies by

Fig. 11

1. Set ignition switch (18) to ON position. (Fig. 12)

*Push priming pump (2 0) several times so that fuel ﬂ ows through

bulb into carburetor. (Fig. 13)

2. Pull the choke lever (19) to choked position (Fig. 13). This will automatically lock to the half-throttle.

3. Push the decompression val ve (21). The valve (21) will automatically return to the original position once

the engine has started. (Fig. 14).

Fig. 12

Fig. 13

In case the brake is not e ﬀ ective, ask our dealer for inspection and repairs.

Starting (Fig. 11- 16) CAUTION

Before starting, make sure chain brake is engaged and that the

bar/chain does not touch anything. (Fig. 11)

Fig. 14

English

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

5. When you hear ﬁ rst ignition, return the choke lever (19 ) all the way in. (Fig. 13)

6. Push the decompression valve.

7. Pull re coil starter briskly ag ain in the aforementioned manner. (Fig. 15)

NOTE

If engine does not start, repeat procedures from 2 to 7.

8. As soon as throttle lever lockout (22) and release immediately. (Fig. 16) Then half-throttle is disengaged.

Pull the front hand guard (2) toward the front handle to disengage

the chain brake.

Allow the engine about 2-3 minutes to warm up before subjecting

Do not run the engine at high speed without the load to avoid

shortening the life of the engine.

engine star t, pull throttle lever (23) full once with

to any load.

Fig. 15

WARNING

Do not stand in-line with chain when cutting.

BASIC TECHNIQUES FOR MAKING FELLING, LIMBING AND BUCKING CUTS The intention of the following information is to provide you with the general introduction to wood cutting techniques.

WARNING

○ This information does not cover all speciﬁ c situations, which

may depend on diﬀ erences in terrain, vegetatio n, kind of wood, form and size of trees, etc. Consult yo ur servicing dealer, forestry agent or local forestry schools for advice on speciﬁ c woodcutt ing problems in your area. This will more eﬃ cient and safer.

○ Avoid cutting in adverse weather conditions, such as dense fog,

heavy rain, bitter cold, high winds, etc.

Adverse weathe r is of ten tiring to work in and creates potentially

dangerous conditions such as slippery ground.

High winds may force the tree to

causing property damage or personal injury.

CAUTION

Never use a chain saw to pry or for any purpose for which it is not

intended.

WARNING

○ Avoid stumbling on obstacles such as stumps, root s, ro cks,

branches and fallen trees. Wat ch out for holes and ditches. Be extreme ly cautious when wor king on slopes or uneven ground.

Shut oﬀ the engine when moving from one work place to another. Always cut at wide open throttle. A slow

catch and force the saw to jerk.

○ Never use the saw with only one hand. You cannot control the saw properly and you may lose control

and injure yourself severely.

Keep the saw body close to your body to improve control and

reduce strain.

When cutting

will pull the saw away from you towards the wood you are cutting.

The saw will control the feeding speed and sawdust will be

directed towards you. (Fig. 18)

with the bottom part of the chain the reactive force

fall in an unexpected direct ion

make your work

moving chain can easily

Fig. 16

WARNING

Do not carry the machine with the engine running.

Stopping (Fig. 17)

Decrease engine speed, and push ignition switch (18) to stop position.

Fig. 17

WARNING

○ Do not overreach or cut above shoulder height. ○ Use ex tra caution when felling, and do not use the saw in a nose-

high position or above shoulder height.

CHAIN CATCHER

The chain catcher is located on the power head just below the chain to further prevent the possibility of a saw user.

broken chain striking the chain

○ When cutting with the upper part of the chain the reactive force

will push the saw toward s you and away from the wo od you are cutting. (Fig. 19)

○ There is a risk of kickback if the saw is pushed far enough so that

you begin to cut with the nose of the bar.

The safest cutting method is to cut with the bot tom part of the

chain. Sawing with the upper par t makes it much more control the saw and increa ses the risk of kickback.

Fig. 18

Fig. 19

diﬃ cult to

○ In case the chain locked, immediately release the throttle lever. If the throttle lever keeps rotating at high speed with the chain

locked, the clutch will overheat causing trouble.

NOTE

Always keep the spiked bumper face to a tree, because the

chain may suddenly be drawn into a tree.

FELLING

more than cutting down a tree. You must also bring it down

Felling is as near to an intended place as possible without damaging the tree or anything else. Before felling a tree, carefully consider all conditions which may eﬀ ect the intended direction, such as: Angle of the tree. Shape of the Wind conditions. Obstacles within tree range (e.g., other trees, power lines, roads, buildings, etc.).

WARNING

○ Always observe the general conditions of the tree. Look for

decay and rot in the trunk which will make it more likely to snap and start to fall before you expect it.

○ Look for dry branches, which may break and hit you when you

are working.

Always keep animals

away while felling. Clear away shrubs and branches from around the tree.

Prepare a path of retreat away from the felling direction.

BASIC RULES FOR FELLING TREES

Normally the felling consists of two main cutting operations, notching and making the felling cut. Start side of the tree facing the feeling direction. Look through the kerf as you saw the lower cut so you do not saw too deep into the trunk. The notch should be deep enough to create a hinge of suﬃ cient width

strength. The notch opening should be wide enough to direct

and the fall of the tree as long as possible. Saw the felling cut from the other side of the tree between one and two inches (3– 5 cm) above the edge of the notch. (Fig. 20)

crown. Snow load on the crown.

and people at least twice the tree length

making the upper notch cut on the

English

Complete the felling cut by sawing around the trunk as in the Fig. 22.

WARNING

These methods are extr emely dangerous because they involve

the use of the nose of guide bar and can result in kickback.

Only properly trained professionals should at tempt these

techniques.

LIMBING

Limbing is removing the branches from a fell er tree.

WARNING

A majority of kickback accidents occur during Iimbing. Do not use the nose of the guide bar. Be ex tremely cautious and

avoid contacting the log, other limbs or objects with the nose of the guide bar. Be extrem ely cautious of limbs under tension. They can spring back towards you and resulting in injury. (Fig. 23)

Fig. 21

Fig. 22

cause loss of control

24. Felling direction

25. 45° minimum notch opening

26. Hinge

27. Felling cut

Never saw completely through the trunk. Always leave a hinge. The hinge guides the tree. If the trunk is completely cut through, you lose control over the felling direction. Insert a wedge or a felling lever in the cut becomes unstable and starts to move. This will prevent the guide bar from binding in the felling cut if you have misjudged the falling direction. Make sure no people have come into the range of the falling tree before you push it over.

FELLING CUT, TRUNK DIAMETER BAR LENGTH

Cut a large, wide notch. Then cut a recess into the center of the notch. Always leave a hinge on both sides of the center cut. (Fig. 21)

Fig. 20

well before the tree

MORE THAN TWICE GUIDE

Stand on the left side of the trunk. Maintain a secure footing and rest the saw on the trunk. Hold the saw close to you so that you are in full control of it. Keep we ll away from the chain. Move only when the trunk is between you and limbs under tension.

LIMBING THICK BRANCHES

When limbing thick branches, the guide bar may get pinched easily. Branches under tension often snap up, so cut troublesome branches in small steps. Apply the same principles as for cross cutting. Think ahead and be awa re of actions.

CROSS CUTTING/BUCKING

Before starting to cut through the log, try to imagine what is going to happen. Look out for stresses in the log and cut through it in such a manner that the guide bar will not get pinched.

Fig. 23

the chain. Watch out for spring back of

the possible consequences of all you r

English

CROSS CUTTING LOGS, PRESSURE ON TOP

Tak e a ﬁ rm stance. Begin with an upper cut. Do not cut too deeply, about 1/3 of the log diameter is enough. Finish with a bottom cut. The saw cuts should meet. (Fig. 24)

31 32

28. Relieving cut

29. Cross cut

30. Pressure on top

31. Pressure side

32. Tens i on side

33. Relative depth of saw cuts

THICK LOG, LARGER THAN GUIDE BAR LENGTH

Begin by cutting on the opposite side of the log. Pull the saw towards you, followed by previous procedure. (Fig. 25)

If the log is lying on the ground make a boring cut to avoid cutting into the ground. Finish with a bottom cut. (Fig. 26)

Fig. 24

Fig. 25

34. Relieving cut

35. Cross cut

36. Pressure on bottom

37. Ten si on side

38. Pressure side

39. Relative depth of saw cuts

THICK LOG, LARGER THAN GUIDE BAR LENGTH

Begin by cutting on the opposite side of the log. Pull the saw towards you, followed by previous procedure. Make a boring cut if the close to the ground. Finish with a top cut. (Fig. 28)

Fig. 28

WARNING

KICKBACK DANGER

Do not attempt a boring cut if you are not properly trained. A

boring cut involves the use of the nose of the guide bar and can result in kickback. (Fig. 29)

Fig. 29

IF THE SAW GETS STUCK

Stop the engine. Raise the log or change its position, using a thick branch or pole as a lever. Do not try to pull the saw free. If yo u do, you can deform the handle or be injured by the saw chain if the saw is suddenly released.

log is

Fig. 26

WARNING

KICKBACK DANGER

Do not attempt a boring cut if you are not properly trained. A

boring cut involves the use of the nose of the guide bar and can result in kickback.

CROSS CUTTING LOGS, PRESSURE ON BOTTOM

Tak e a ﬁ rm stance. Begin with a bottom cut. The depth of the should be about 1/3 of the log diameter. Finish with an upper cut. The saw cuts should meet. (Fig. 27)

cut

37 38

Fig. 27

MAINTENANCE

MAINTENANCE, REPLACEMENT OR REPAIR OF THE EMISSION CONTROL DEVICES AND SYST EM MAY BE PERFORMED BY ANY NON-ROAD EN GINE REPAIR ESTABLISHMENT OR INDIVIDUAL.

Carburetor adjustment (Fig. 30)

In the carburetor, fuel is mixed with air. When the engine is test run at the factory, the carburetor is adjusted. A further adjustment may be required, according to climate and altitude. The carburetor has one adjustment possibility: T = Idle speed adjustment screw.

Fig. 30

English

Idle sp eed ad justm ent (T )

Check t hat the air ﬁ lter is clean. When the idle speed is correct, the cutt ing att achment will n ot rotat e. If adju stmen t is requ ired, cl ose (clock wise) the T-screw, with the eng ine run ning, until the cutting attachment starts to rotate. Open (counter-clock wise) the screw until the cutting at tachment sto ps. You have reached th e corre ct idle speed w hen the e ngine r uns smo othly i n all pos itions well be low the rpm whe n the cut ting attachment st arts to rotate. If the cu ttin g attachment still ro tates af ter idle spee d adjustment, contact HITACHI dealer.

WARNING

When the e ngine i s idlin g the cut ting attachment must under no

circumstan ces rot ate.

NOTE

Do not touch the High spee d adjustment (H) a nd the Low speed

adjustment (L).

Those a re only fo r HITACHI deal er. If you r otate them, It w ill cause a ser ious damage to t he machine.

Air ﬁ lter (Fig. 31)

The air ﬁ lter (40) must be cleaned from dust and dirt in order to avoid:

○ Carburetor malfunctions. ○ Starting problems. ○ Engine power reduction. ○ Unnecessary wea r on the en gine pa rts. ○ Abnormal fuel consumption.

Clean the air ﬁ lter dai ly or mor e often if working in exce ption ally dusty areas. Remove the air ﬁ lter cover (41) and the ﬁ lter (40). Rinse them in war m soap su ds. Che ck that t he ﬁ lter is dry before reass embly. An ai r ﬁ lter that has been used for some time cannot be clean ed comp letely. Therefor e, it must regularly be replaced with a new one. A damaged ﬁ lter mu st always b e repla ced.

NOTE

In some areas, lo cal law r equir es usin g a resis tor spar k plug

to suppress ignition signals. If this machine was originally equipped with resistor spark plug, use same type of spark plug for replacement.

Oiler p ort (Fi g. 33)

Clean the chain oiler port (42) whe never po ssibl e.

Fig. 33

Guide b ar (Fig. 3 4)

Before using the machin e, clean t he groove and oil er por t (43) in the bar with the spe cial ga uge oﬀ ered as an optional accessory.

Fig. 34

Side ca se (Fig. 35)

Always kee p the sid e case an d drive area clea n of saw dus t and debri s. Perio dically apply oil or g rease to this are a to prote ct from corro sion as s ome tre es cont ain high levels o f acid.

Fig. 31

Spark p lug (Fig . 32)

The spark plug c ondit ion is in ﬂ uenced by:

○ An incorrect carburetor setting. ○ Wrong fuel mix ture (too much oi l in the gasolin e) ○ A dirty air ﬁ lter. ○ Hard runnin g conditions (su ch as col d weathe r).

These factors cause deposits on the s park pl ug elec trode s, whic h may resu lt in mal funct ion and star ting di ﬃ culties. If the engine is low on power, diﬃ cult to start or runs poorly at idling speed, always check t he spark plug ﬁ rst. If the spa rk plug is dir ty, clean it and c heck the ele ctrode gap. Rea djust if nece ssary. The cor rect gap is 0.6 mm. The spark plug s hould b e repla ced after abou t 100 oper ation hours or earlier if th e elect rodes a re badl y eroded.

Fig. 32

Fig. 35

Fuel ﬁ lter (Fig. 36)

Remove the fuel ﬁ lter from the fuel tank and thoroughly wash it in solven t. Afte r that, push the ﬁ l ter into the tank c ompletely.

NOTE

If the ﬁ lter i s hard du e to dust an d dirt, repla ce it.

Fig. 36

English

Chain oil ﬁ lter (Fig. 37)

Remove the oil ﬁ lter and thoroughly wash it in solvent.

Fig. 37

Cleaning the cylinder ﬁ ns (Fig. 38)

When wood chips are caught between cylinder ﬁ ns (4 4), the engine may overheat , resulting in lower output. To avoi d this, always keep cylinder ﬁ ns and fan case clean.

Fig. 38

Icing protection system (Fig. 39, 40)

This system is to protect carburetor from icing when the unit is operated in winter time.

1. When yo u need icing system wor k, remove air ﬁ lter cover (41). Pull out the shutter (45 ) from inside the air ﬁ lter cover and reinstall it in winter This will allow heated air to ﬂ ow from cylinder side to carburetor cabin through the opening (46).

NOTE

When winter time has been over and carburetor will not suﬀ er from icing, make sure that the shutter is reinstalled in ordinary position

40).

(Fig.

time position by turning half-way. (Fig. 39)

Fig. 39

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 and spin the engine over several times to distribute oil. Cover the unit and store it in a dry area.

CHAIN SHARPENING Parts of a cutter (Fig. 41, 42)

WARNING

○ Gloves should be used when sharpening chain. ○ Be sure to round oﬀ the front edge to reduce the chance of

kickback or tie-strap breakage.

47. To p plate

48. Working corner

49. Side plate

50. Gullet

51. Heel

52. Chassis 53 Rivet hole

54. Toe

55. Depth gauge

56. Correct angle on top plate type)

57. Slightly protruding “hook” or point (curve on non-chisel chain)

58. Top of depth gauge at correct height below top plate

59. Front of depth gauge rounded oﬀ

LOWERING DEPTH GAUGES WITH A FILE

1) If you sharpen yo ur cut ters with a ﬁ le holder, check depth.

2) Check depth gauges eve ry third sharpening.

3) Place depth gauge tool on cutter. If depth gauge projects, ﬁ le it level with the top of the tool. Always ﬁ le from the inside of the chain toward an outside cutter. (Fig. 43)

into the cylinder through the spark plug hole,

Fig. 41

Fig. 42

(deg ree of angle depends on chain

and lower the

Fig. 40

4) Round oﬀ front corner to maintain original shape of depth gauge after using depth gauge tool. Always follow the recommended depth gauge setting fou nd in the maintenance or operator manual for your saw. (Fig. 44)

Fig. 44

Fig. 43

GENERAL INSTRUCTIONS FOR FILING CUTTERS

File (60) cutter on one side of the chain from the inside out. File on forward stroke only. (Fig. 45)

Fig. 45

5) Keep all cutters the same length. (Fig. 46)

Fig. 46

6) File enough to remove any damage to cutting edges (si de plate (62) and top plate (63)) of cutter. (Fig. 47)

English

Maintenance schedule

Below you will ﬁ nd some general maintenance instructions. Fo r further information please contact HITACHI dealer.

Daily maintenance

○ Clean the ex terior of the unit. ○ Clean the chain oil ﬁ lter port. ○ Clean the groove and oil ﬁ lter port in the guide bar. ○ Clean the side case ○ Check that the saw chain is sharp. ○ Check that the bar nuts are suﬃ ciently tightened. ○ Make sure that the chain transport guard is undamaged and that

it can be securely ﬁ tted.

○ Check that nuts and screws are suﬃ ciently tightened. Especially inspect the bolt

properly tightened before starting engine. Should any of the bolts be loose, retighten them immediately. Failure to do so could result in serious hazard.

○ Check the tip of the guide bar. Please exchang e it for the new

one when it is

○ Check the band of chain brake. Please exchan ge it for the new

one when it is worn out.

○ Clean the air ﬁ lter.

Weekl y maintenance

○ Check the recoil starter, especially cord. ○ Clean the ex terior of the spark plug. ○ Remove the spark plug and check the electrode gap. Adjust

0.6 mm or change the spark plug.

○ Clean the cooling ﬁ ns on the cylinder and check that the air

intake at the recoil starter is not clogged.

Monthly maintenance

○ Rinse the fuel tank with gasoline, and clean fuel ﬁ lter. ○ Clean chain oil ﬁ lter. ○ Clean the ex terior of ○ Clean the fan and the space around it.

NOTE

When ordering the par ts to your nearest dealer, please use the

item numbers showing on the parts breakdown section in this instruction.

MODEL NO.

OREGON

of saw dust.

of muﬄ er and ensure that they are

worn out.

the carburetor and the space around it.

BAR NO. LENGTH-TYPE CHAIN NO.

160 MLBK 041 180 MLBK 041 200 PXBK 041

16” 18” 20”

95VPX-66 95VPX-72 20BPX-78

it to

Fig. 47

NOTE Do not ﬁ le or alter the tops of bumper drive links (61). (Fig. 46)

7SHARPENING ANGLES FOR SHARPENING SAW CHAIN

1. Part Nu mber 95VPX /20BPX

2. Pitch 0.325”

3. Depth Gauge Setting 0.025"

85°

4. Side Plate Filing Angle 85°

5. Top Plate Angle 30°

6. File Guide Angle 100°

100°

ITEM

NO.

1 START LABEL 2 CLEANER COVER (C51) 1 3 SHUTTER PLATE 1 4 COVER SET BOLT 7 5 CYLINDER COVER (C51) 1 6 CLEANER KNOB 1 7 KNOB PACKING 1 8 CLEANER ELEMENT (B) 1

9 CLEANER ELEMENT (A) 1 10 NUT M6 3 11 BOLT WASHER M6 1 12 SPRING HOLDER 1

14 ANTIVIBRATION SPRING 1 15 DAMPER SET BOLT 3 16 SEAL LOCK SCREW M4 17 SCAVENGING COVER (B) 1 18 COVER PACKING (C51) 2 19 EXHAUST PIPE (C51) 1 20 MUFFLER GAUZE (C51) 1

22 FRONT HANDLE 1

25 BOLT WASHER M4 5 26 MUFFLER PROTECTOR 1

28 MACHINE SCREW M4 29 OIL PIPE (CS40) 1 30 OIL PUMP 1 31 CLIP 4

33 SEA LOCK SCREW M5 × 12 3 34 SPIKE 1

36 MUFFLER CAP 2

39 MUFFLER (C51) 1 40 MUFFLER PACKING (C51) 1 41 GROMMET 2 42 FUEL PIPE 2.5 43 PRIMING PUMP COMP. 1 44 DECOMP. 1 45 SPARK PLUG BPMR7A 1 46 INTAKE PACKING (C51) 1 47 INTAKE (C51) 1 48 CAB. INSULATOR RUBBER 1

50 FUEL PIPE 1 51 CARBURETOR ASS'Y 1 52 SCREW 1 53 PUMP GASKET 1 54 PUMP DIAPHRAGM 1

PART NAME Q’TY

HEX. SOCKET HD. BOLT (W/FLANGE) M6

TAPPING SCREW (W/FLANGE) D5

HEX. SOCKET HD. BOLT M4 × 10

MUFFLER PROTECTOR PACKING

SEAL LOCK HEX. SOCKET HD. BOLT M5

HEX. SOCKET HD. BOLT M6

HEX. SOCKET HD. BOLT M5 × 12

CARBURETOR INSULATOR (C51)

× 4 ×

16 3

90 1

10 18

ITEM

NO.

55 INLET SCREEN 1

56 NEEDLE VALVE 1 57 VALVE SPRING 1

59 METERING DIAPHRAGM 1

61 IDLE ADJUST SPRING 1 62 IDLE ADJUST SCREW 1 63 HINGE PIN SET SCREW 1 64 CONTROL LEVER 1 65 HINGE PIN 1 66 SET SCREW 1

67 FUEL PIPE 1 68 WASHER 55

70 CLEANER SUPPORT (C51) 1 71 FUEL PIPE 1 72 CYLINDER 1 73 SCAVENGING COVER (A) 1 74 CYLINDER PACKING (C51) 1

75 PISTON RING 2 76 PISTON (44) M1

77 CIR CLIP 2 78 PISTON PIN COLLAR (C51) 2

79 ENGINE CASE (B) 1 80 OIL SEAL 2 81 BALL BEARING 6202C3 2 82 CRANK SHAFT 1

84 PISTON PIN 1 85 NEEDLE BEARING (A) 1 86 ENGINE CASE (A) 1 87 REAR DAMPER (C51) 1

88 BRAKE HANDLE 1 89 CAUTION LABEL 1 90 BRAKE LEVER SPRING (B) 1 91 CHOKE ROD RUBBER 1

92 CHOKE BUTTON 1 93 OPERATIONAL PANEL 1

94 STOP SWITCH 1

111 NAME PLATE 1

112 FLANGE NUT M8 3 113 SIDE CASE SUB 1 114 CHAIN PULLER 1 115 SAW CHAIN 1 116 GUIDE PLATE (B) 1 117 BAR 1 118 OIL GROMMET (A) 1 119 FUEL PIPE 1 120 BOLT WASHER D5 1 121 OIL FILTER 1 122 OIL FILTER BODY 1 123 GUIDE PLATE (A) 1

124 DAMPER (C51) 2 125 CHAIN CATCHER 1 126 BRAKE LINK 1 127 BRAKE SPRING 1 128 BRAKE BAND 1 129 NEEDLE ROLLER D3 1

PART NAME Q’TY

DIAPHRAGM PACKING-METERING

DIAPHRAGM COVER-METERING

HEX. SOCKET HD. BOLT M5

CRANK CASE PACKING (C51)

ITEM

NO.

130 BRAKE LINK COVER 1 131 CLUTCH 1 132 CLUTCH WASHER (B) 1 133 CLUTCH HOUSING 1 134 NEEDLE BEARING 1 135 RIM SPROCKET 1 136 CLUTCH WASHER 1 137 OIL PUMP COVER (C51) 1 138 WORM 1 139 AIR VENT SPONGE 1 140 AIR VENT VALVE (B) 1

141

142 REAR HANDLE GRIP 1

143

144 THROTTLE LEVER SPRING 1 145 NUMBER PLATE 1 146 REAR HANDLE 1 147 SPRING PIN 5 148 THROTTLE ROD 1 149 THROTTLE LEVER 1 150 AIR VALVE CAP 1 151 INNER CAP 1 152 GROMMET 1 153 PUMP FILTER BODY 1 154 FRONT DAMPER 1 155 SPRING HOLDER 2

156

157 ANTIVIBRATION SPRING 2 158 TANK MARK LABEL 1 159 TANK CAP PACKING 2 160 FUEL TANK CAP ASS'Y 2 161 BAND 1 162 PLUG CAP 1 163 CORD (A) 1 164 CORD (B) 1

165

166 IGNITION COIL 1

167

168 MAGNETO ASS'Y 1 169 MAGNETO ROTOR 1 170 STARTER PAWL SPRING 2 171 WASHER 0.8 2 172 STARTER PAWL 2 173 SHIM 2 174 STEP BOLT 2 175 AIR DEFLECTOR 1 176 RECOIL STARTER 1 177 HITACHI LABEL 1 501 CHAIN COVER 1 502 COMBI BOX SPANNER 1

PART NAME Q’TY

TAPPING SCREW (W/FLANGE) D4

THROTTLE LEVER LOCKOUT

FLANGED TAPPING SCREW D6

METAL FITTING OF PLUG CAP

HEX. SOCKET HD. BOLT (W/FLANGE) M4

25 1

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

Minato-ku, Tokyo, Japan

109 Code No. E99245511 G Printed in China

Hitachi CS 51EA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual