Chain Saw
CS 51EA
Read through carefully and understand these instructions before use.
Handling instructions
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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.
Emergency stop
Read, understand and follow all warnings and
instructions in this manual and on the unit. Fuel and oil mixture
Always wear eye, head and ear protectors when using
this unit. Chain oil fi ll
Warning, kickback danger. Be careful of possible
sudden and accidental upward and/or backward
motion of the guide bar.
Carburetor adjustment - Idle speed
One-handed usage not permitted. While cutting, hold
saw fi rmly with both hands with thumb fi rmly locked
around front handle.
Carburetor adjustment - Low speed mixture
Chain brake Carburetor adjustment - High speed mixture
Choke Oil pump adjustment
On/Start Priming pump
Off /Stop Decompression valve
Contents
WHAT IS WHAT? ............................................................................ 18
WARNINGS AND SAFETY INSTRUCTIONS ................................ 19
SPECIFICATIONS .......................................................................... 20
ASSEMBLY PROCEDURES ........................................................... 21
OPERATING PROCEDURES ......................................................... 21
MAI NT ENA NCE .............................................................................. 23
Parts breakdown
18
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 accidental
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 the oil tank.
5. Recoil starter: Pull handle to start the engine.
6. Front handle: Support handle located at or towards 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 starting.
9. Priming pump; Device for supplying extra fuel, to aid starting.
10. Decompression valve: 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. Chain brake (Front hand guard): Device for stopping or locking
the chain.
14. Spiked bumper: Device for acting as a pivot when in contact with
a tree or log.
15. Chain 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 being used.
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.
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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 working in trees the safety boots must be
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 tool when you are tired, ill or under the
infl uence of alcohol, drugs or medication.
○ Never let a child or inexperienced person operate the machine.
○ Wear 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.
○ For respiratory protection, wear 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 the cutting equipment.
○ When the unit 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.
○ The operator must obey the local regulations of cutting area.
WARNING
○ Antivibration systems do not guarantee that you will not sustain
Hand-Arm Vibration Syndrome or carpal tunnel syndrome.
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 exposure to high noise levels may cause
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 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.
○ Make sure the side case is properly attached.
○ Keep others away when making carburetor adjustments.
○ 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.
○ 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, if improper tools are
used to remove the fl ywheel 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 recommended by the
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 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 and let it cool for a few minutes before removing fuel
tank 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 fl ames from water heaters, electric motors
or switches, furnaces, etc.
WARNING
Fuel is easy to ignite or get explosion or inhale fumes, so that pay
special attention when handling or fi lling fuel.
Cutting safety
○ Do not cut any material other than wood or wooden objects.
○ For respiratory protection, wear an aerosol protection mask
when cutting the wood after insecticide has been applied.
○ Keep others including children, animals, bystanders and helpers
outside the hazard zone. Stop the engine immediately if you 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 over-reach.
○ 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 exit from a failing tree.
○ 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 bumper face to a tree, because the
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 follow through and cut your legs, feet or
body, or contact an obstruction.
○ Be alert against 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 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 fi rst-aid kit when operating any power equipment.
○ Never start or run the engine inside a closed room or building
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 HiKOKI replacement parts as recommended
by the manufacturer.
CAUTION
Do not disassemble the recoil starter. You may get a possibility
of personal injury with recoil spring.
WARNING
Improper maintenance could result in serious engine damage or
in serious personal injury.
20
Transport and storage
○ Carry the unit/machine by hand with the engine stopped and the
muffl er away from your body.
○ Allow the engine to cool, empty the fuel tank, and secure the
unit/machine before storing or transporting in a vehicle.
○ 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 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 HiKOKI dealer 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.
WARNING
KICKBACK DANGER (Fig. 1)
One of the most severe dangers when working 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 wood closes in and
pinches the saw chain in the cut. Tip contact in some cases may
cause a lightning fast reverse reaction, kicking the guide bar up and
back toward you. Pinching the saw chain along the top of the guide
bar may also push the guide bar rapidly back towards you. Either of
these reactions may cause you to lose control of the saw which could
result in serious personal injury. Even though your saw has safety
built into its design, you should not rely on these safety features
exclusively. Know where your bar tip is at all times. Kickback does
occur if you allow the kickback zone (1) of the bar to touch an object.
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 a fi rm grip on the saw with
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
for the saw chain. The lack of this maintenance may increase the
possibility of kickback.
SPECIFICATIONS
○ Code “CS” of model name means “Chain saw”
Model CS51EA (40S) CS51EA (45S) CS51EA (50S)
Type of equipment Chain saw, portable
Engine Size (cm3)50.1
Spark Plug NGK BPM-7A
Fuel Tank Capacity (cm3)530
Chain Oil Tank Capacity (cm3)270
Dry Weight (kg)
(Without guide bar and chain) 5.1
Chain pitch (mm) 8.26
Chain gauge (mm) 1.27
Sound pressure level LpA (dB (A)) by ISO 22868
Equivalent
Uncertainty
104
1
Sound power level LwA (dB (A)) by ISO 22868
Measured
Uncertainty
Sound power level LwA (dB (A)) by 2000/14/EC
Measured
Guaranteed
113
2
114
117
Vibration level (m/s2) by ISO 22867
Front handle
Rear handle
Uncertainty
3.3
2.7
0.8
Guide bar length (mm) 400 450 500
Type of chain 95VPX
(Oregon)
20BPX
(Oregon)
Max. engine power
by ISO 7293 (kW) 2.5
Max. engine speed (min-1)13500
Idle engine speed (min-1) 3000
Specifi c fuel consumption at maximum engine
power (g/kWh) 439
Max. chain speed (m/sec) 26.0
Sprocket (number of teeth) 7
NOTE: Equivalent noise level/vibration levels are calculated as the time-weighted energy total for noise/vibration levels under various
working conditions with the following time distribution: 1/3 idle, 1/3 full, 1/3 racing speed.
*All data subject to change without notice.
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