Topsun HCS128 User manual

CHAIN SAW
HCS128
HCS128C
OWNER’S MANUAL
WARNING
•Before using our products, please read this
manual carefully to understand the proper use
of your unit.
•Keep this manual handy.
ZHEJIANG ZHONGJIAN TECHNOLOGY CO., LTD.
No.10 Mingyuan South AVE, Economic Development Zone, Yongkang, Zhejiang, 321300, P.R. China

Original Instructions
1
CONTENTS
SAFETY FIRST
Instructions contained in warnings within this manual marked with a symbol
concern critical points which must be taken into consideration to prevent
possible serious bodily injury, and for this reason you are requested to read all such
instructions carefully and follow them without fail.
■WARNINGS IN THE MANUAL
This mark indicates instructions which must be followed in order to prevent accidents
which could lead to serious bodily injury or death.
This mark indicates instructions which must be followed, or it leads to mechanical failure,
breakdown, or damage.
This mark indicates hints or directions useful in the use of the product.
1. Parts location…………………………………………………………………………………………………… 4
2. Symbols on the machine……………………………………………………………………………………5
3. For safe operation………………………………………………………………………………………………8
4. Installing guide bar and saw chain………………………………………………………………………12
5. Fuel and chain oil………………………………………………………………………………………………14
6. Operation ………………………………………………………………………………………………………16
7. Sawing ……………………………………………………………………………………………………………21
8. Maintenance……………………………………………………………………………………………………25
9. Maintenance of Saw Chain and Guide Bar …………………………………………………………28
10. Storage……………………………………………………………………………………………………………31
11. Waste disposal and environmental protection……………………………………………………31
12. Warranty…………………………………………………………………………………………………………31
13. Troubleshooting guide………………………………………………………………………………………32
14. Specifications ……………………………………………………………………………………………………33

Original Instructions
2
CONTENTS
Attention ! Read these notes before you start working with the saw and keep
them.
Read the instructions carefully. Familiarise with the control elements so that you are
able to safely operate the device. Always keep these Operating Instructions together
with the chain saw.
Attention! Risk of hearing defects.
Under normal operating conditions, this device can expose the operator to a noise level
of 80 dB(A) or more.
Attention: Noise protection ! Please observe the local regulations when operating
your device.
Intended / not intended use:
The chain saw serves trunks, square timbers and for cutting branches, according to the
available cutting length. Only materials from wood may be worked on.
Sufficient personal protection equipment (PPE) is required according to the operating
instructions during the use. This product is designed for use by a trained operator for
pruning and dismantling standing tree crowns. For damage or injuries which resulting
from misapplication are responsible by the user/operator and not the manufacturer.
Suitable sawing chains, guide bars combinations may be used as mentioned in the
operating instructions only for the machine. A component of the intended use is also the
attention of the safety references, as well as the operating instructions in the operating
instructions. Persons, who serve the machine, must make themselves trained and
familiar with this product and think over all the possible dangers. Beyond that the valid
rules for the prevention of accidents are to be kept in every detail. Other general rules
within ranges according to industrial medicine and in terms of safety are to be considered.
Changes in the machine completely exclude an support of the manufacturer and from it
developing damage and lead to expiring the warranty. This equipment is designed for use
in home garden.
Remainder driven
Also when appropriate using the tool always remains a certain residual risk, which cannot
be excluded. From the kind and construction of the tool the following potential

Original Instructions
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endangerments can be derived:
- Contact with the unprotected sawing chain (cuts)
- Unexpected, sudden movement of the sawing sword (cuts)
- Damage of the ears, if no prescribed protection of the ears is carried
- Inhale from poisonous particle, exhaust gases of the combustion engine
- Contact of gasoline on the skin
- Noise. A degree of noise from the machine is not avoidable. Route noisy work is to be
licensed and limits for certain periods. Keep rest periods and they may need to restrict
the working hours to a minimum. For their personal protection and protection of people
working nearby, an appropriate hearing protection shall be worn;
- Vibration. Warning: The actual existing vibration emission value during use of the
machine can deviate from the manual or the manufacturer specified. This can be caused
by the following factors, before or during each of use should be considered:
- If the machine is used correctly
- If the method of cutting the material and how it is processed correctly.
- The use of the machine state is in the regulatory
- Sharpness condition of cutting tool or cutting tool real
- The grab handles are mounted back to optional vibration handles and are they fixed to
the machine body.
If you notice an unpleasant sensation or skin discoloration during use of the machine on
your hands once you stop working. Place an adequate work breaks. In disregard of
adequate work breaks, there may be a hand-arm vibration syndrome.
Always follow all the local safety regulations which can restrict the use of the machine.
CONTENTS

Original Instructions
4
1. Parts location
1. Saw chain
2. Guide bar
3. Front hand guard
4. Starter handle
5. Air filter cover
6. Lock nut
7. Choke knob
8. Trigger lock-out
9. Rear handle
10. Throttle trigger
11. Engine switch
12. Front handle
13. Oil tank
14. Fuel tank
15. Guide bar scabbard
16. Primer bulb
17. Clutch cover

Original Instructions
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2. Symbols on the machine
(1) Read, understand and follow all warnings.
(2) Warning! Danger of kickback. Beware of chain saw
kickback and avoid contact with bar tip.
(3) Do not use chain saw one-handed.
(4) Always use chain saw two-handed.
(5) Appropriate ear, eye, and head protection must be worn
(6) Read operator's instruction book before operating this
machine.
.
(7) Always wear safety and anti-vibration(AV) gloves when
operating the device.
(8) Always wear safety and slip-resistant boots when
operating the device.

Original Instructions
6
2. Symbols on the machine
For safe operation and maintenance, symbols are
carved in relief on the machine. According to these
indications, please be careful not to make any mistake.
(a). The port to refuel the "MIX GASOLINE"
Position: near the fuel cap
(b). The port to refuel the chain oil
Position: near the oil cap
(c). Operate the engine switch
Flipping the switch to the "O" position, immediately
the engine stops.
Position: on the switch
turn the choke knob counter clockwise, close the choke;
turn the choke knob clockwise, open the choke.
Position: Near the air filter cover
(f). The screw under the "H" stamp is The High-speed
mixture adjustment screw.
The screw under the "L" stamp is The Slow-speed
mixture adjustment screw.
The screw up the "T" stamp is the idle speed
adjustment screw.
Position: upper-left of the rear handle

Original Instructions
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2. Symbols on the machine
(g). Shows the directions that the chain brake is
released (white arrow) and activated (black arrow).
Position: Front of the clutch cover
(h). Shows the direction of the saw chain installation.
Position: Front of the clutch cover
(I).Guaranteed sound power level
(J). Engine manual start.

Original Instructions
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3. For safe operation
■Before operate the product
1. Before using our products, please read this manual carefully to understand the
proper use of your unit.
2. Never operate a chain saw when you are fatigued, ill, or upset, or under the
influence of medication that may make you drowsy, or if you are under the influence
of alcohol or drugs.
3. Operate the chain saw only in well ventilated areas. Never start or run the engine
inside a closed room or building. Exhaust fumes contain dangerous carbon
monoxide.
4. Never cut in high wind, bad weather, when visibility is poor or in very high or low
temperatures. Always check the tree for dead branches which could fall during the
felling operation.
5. Use safety and slip-resistant footwear, snug fitting clothing and eye, hearing and
head protection devices. Use the anti-vibration(AV) glove.
It is believed that a condition called Raynaud’s phenomenon, which affects the fingers
of certain individuals may be brought about by exposure to vibration and cold. Loss of
color and numbness in the fingers. The following precautions are strongly
recommended because the minimum exposure which might trigger the ailment is
unknown.
Keep your body warm, especially the head, neck, feet, ankles, hands and wrists.
Maintain good blood circulation by performing vigorous arm exercises during frequent
work breaks and also by not smoking. Keep the saw chain sharp and the saw, including
the AV system, well maintained. A dull chain will increase cutting time, and pressing a
dull chain through wood will increase the vibrations transmitted to your hands. A saw
with loose components or with damaged or worn AV buffers will also tend to have
higher vibration levels. Limit the hours of operation.
All the above mentioned precautions do not guarantee that you will not sustain white

Original Instructions
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finger disease or carpal tunnel syndrome. Therefore, continual and regular users
should monitor closely the condition of their hands fingers.
If any of the above symptoms appear, seek medical advice immediately.
6. Always use caution when handling fuel. Wipe up all spills and then move the chain
saw at least ten(10)feet (three(3) m) from the fueling point before starting the
engine.
7. Eliminate all sources of sparks or flame (ie. smoking, open flames, or work that can
cause sparks) in the areas where fuel is mixed, poured, or stored.
Do not smoke while handling fuel or while operating the chain saw.
8. Do not allow other persons to be near the chain saw when starting the engine or
cutting a wood. Keep bystanders and animals out of the work area. Children, pets,
and bystanders should be a minimum of 30feet (10m) away when you start or
operate the chain saw.
9. Never start cutting until you have a clear work area, secure footing, and planned
retreat path from the falling tree.
10. Always hold the chain saw firmly with both hands when the engine is running. Use
a firm grip with thumb and fingers encircling the chain saw handles.
11. Keep all parts of your body away from the saw chain when the engine is running.
Before you start the engine, make sure the saw chain is not contacting anything.
12. Always carry the chain saw with the engine stopped, the guide bar and saw chain to
the rear, and the muffler away from your body.
13. Always inspect the chain saw before each use for worn, Ioose, or changed parts.
Never operate a chain saw that is damaged, improperly adjusted, or is not
3. For safe operation

Original Instructions
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completely and securely assembled. Be sure that the saw chain stops moving when
the throttle control trigger is released.
14. All chain saw service, other than the items listed in the Operator’s Manual, should
be performed by competent chain saw service personnel. (e.g., if improper tools
are used to remove the flywheel, or if an improper tool is used to hold the flywheel
in order to remove the clutch, structural damage to the flywheel could occur which
could subsequently cause the flywheel to disintegrate).
15. Always shut off the engine before setting it down.
16. Use extreme caution when cutting small size brush and saplings because slender
material may catch the saw chain and be whipped toward you or pull you off
balance.
17. When cutting a limb that is under tension, be alert for spring back so that you will
not be struck when the tension in the wood fibers is released.
18. Keep the handles dry, clean and free of oil or fuel mixture.
19. Guard against kickback. Kickback is the upward motion of the guide bar which
occurs when the saw chain at the nose of the guide bar contacts an object. Kickback
can lead to dangerous loss of control of the chain saw.
20. When transporting your chain saw, make sure the appropriate guide bar scabbard
is in place.
Securely place the machine during transport to prevent loss of fuel, damage or
injury.
KICKBACK SAFETY PRECAUTIONS FOR CHAIN SAW USERS
Kickback may occur when the nose or tip of the guide bar
3. For safe operation

Original Instructions
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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
towards the operator. Pinching the saw chain along the top of
the guide bar may push the guide bar rapidly back towards the
operator. Either of these reactions may cause you to lose control of the saw which could
result in serious personal injury.
● Do not rely exclusively on the safety devices built into your saw. As a chain saw user
you should take several steps to keep cutting jobs free from accident or injury.
(1) With a basic understanding of kickback you can reduce or eliminate the element of
surprise. Sudden surprise contributes to accidents.
(2) Keep a good grip on the saw with both hands,
the right hand on the rear handle, and the left
hand on the front handle, when the engine is
running. Use a firm grip with thumbs and fingers
encircling the chain saw handles. A firm grip will
help you reduce kickback and maintain control of
the saw. Don’t let go.
(3) Make certain that the area in which you’re
cutting is free from obstructions. Do not let the
nose of the guide bar contact a log, branch, or
any other obstruction which could be hit while
you are operating the saw.
(4) Cut at high engine speeds.
(5) Do not overreach or cut above shoulder
height.
(6) Follow manufacturers sharpening and
maintenance instructions for saw chain.
(7) Only use replacement bars and chains
specified by the manufacturer or the equivalent.
3. For safe operation

Original Instructions
12
4. Installing guide bar and saw chain
A standard saw unit package contains the items as
shown below.：
(1) Power unit
(2) Saw chain
(3) Guide bar
(4) Guide bar scabbard
(5) Plug wrench
(6) File
Open the box and install the guide bar and the
saw chain on the power unit as follows.
The saw chain has very
sharp edges. Use protective gloves for safety.
1. Pull the guard towards the front handle to
check that the chain brake is not on.
`
2. Loosen nuts, then remove the clutch cover (2)
and the spacer (1).
3. Gear the chain to the sprocket and, while fitting
the saw chain around the guide bar, mount the
guide bar to the power unit. Make sure the pin (4)
on the clutch cover has inserted in the hole (6) on
the engine base. Fit the chain tensioner nut (3)
into the lower hole (5) of the guide bar, then
install the clutch cover, and fasten the mounting
nut to finger tightness.

Original Instructions
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4. Installing guide bar and saw chain
Pay attention to the correct direction of the saw
chain.
(1)Moving direction
4. While holding up the tip of the bar, adjust the chain tension by turning the tensioner
screw until the tie straps just touch the bottom side of the bar rail.
5. Tighten the tensioner screw.
(1) Loosen
(2) Tighten
Front tension
Side tension
6. Tighten two nuts securely with the bar tip held
up (12 ~ 15 Nm). Then check the chain for smooth
rotation and proper tension while moving it by
hand. If necessary, readjust with the clutch cover
loose.
It is very important to maintain the proper chain tension. Rapid wear of the guide bar or
the chain coming off easily can be caused by improper tension. Especially when using a
new chain, take good care of it since it should expand when first used.
The Spiked bumper belongs to the chain saw. It must be screwed up on chain saw
before the initial use. Please fix the spiked bumper with two screws on the forefront of
the chain saw.

Original Instructions
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5. Fuel and chain oil
■Fuel
The engines are lubricated by oil specially
formulated for air-cooled 2-cycle gasoline engine
use. If oil is not available, use an antioxidant
added quality oil expressly labeled for air-cooled
2-cycle engine use.
RECOMMENDED MIXING RATIO
GASOLINE 50: OIL 1 (class JASO FB or ISO EGB)
These engines are certified to operate on
unleaded gasoline.
The fuel is highly flammable. Do not smoke or
bring any flame or sparks near fuel.
1. FUEL WITH NO OIL(RAW GASOLINE) –It will
cause severe damage to the engine inner parts
very quickly.
2. OIL FOR 4-CYCLE ENGINE USE or WATER
COOLED 2-CYCLE ENGINE USE –It can cause spark
plug fouling, exhaust port blocking, or piston ring
sticking.
Petrol, litre
Two-stroke oil, millilitre
2% (1:50)
1
20
5
100
10
200
20
400

Original Instructions
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■HOW TO MIX FUEL
1. Measure out the quantities of gasoline and oil
to be mixed.
2. Put some of the gasoline into a clean, approved
fuel container.
3. Pour in all of the oil and agitate well.
4. Pour in the rest of gasoline and agitate again for
at least one minute.
5. Put a clear indication on the outside of the
container to avoid mixing up with gasoline or
other containers.
■CHAIN OIL
Use special chain saw oil all year round.
Do not use waste or regenerated oil that can
cause damage to the oil pump.
5. Fuel and chain oil

Original Instructions
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6. Operation
■STARTING ENGINE
1. Untwist and remove the fuel cap and oil cap.
Rest the cap on a dustless place.
2. Put fuel into the fuel tank and fill the chain oil
into the oil tank to 80% of the full capacity.
3. Fasten the fuel cap and oil cap securely and
wipe up any fuel spillage around the unit.
4. Put the switch to the "I" position.
5. Continuously push the primer bulb until fuel
comes in the bulb.
(1) Oil (2) Fuel (3) Engine switch
(4) Primer bulb (5) Choke knob
6. Pull out the choke knob. The choke will close
and the throttle lever will then be set in the
starting position.
When restarting immediately after stopping the
engine. Set choke in the open position
Once the choke knob has been turn counter
clockwise, it will not return to the running position
even if you press the throttle trigger or press
down on knob with your finger. When you wish to
return the choke knob to the running position,
press the throttle trigger instead.
7. Push the front handle guard down toward the
front to activate the chain brake.
8. While holding the saw unit securely on the
ground, pull the starter handle vigorously.

Original Instructions
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9. When firing occur, press the throttle trigger to
allow the choke return to the running position and
pull the starter handle again to start the engine.
10. Pull up the front handle guard toward the
front handle to release brake. Then, allow the
engine to warm up with the trigger pulled slightly.
Before you start the engine, make sure the saw
chain is not contacting anything. Make sure the
chain brake always is activated before each
starting.
■CHECKING OIL SUPPLY
After starting the engine, run the chain at medium
speed and see if chain oil is scattered off as shown
in the figure.
Chain oil
The oil tank should become nearly empty by the
time fuel is used up. Be sure to refill the oil tank
every time when refueling the saw.
■CHECKING FUNCTIONAL OF THE CLUTCH
Before each use, you shall confirm that there is no chain movement when the chain saw
running at idling speed.
When running, the machine must always be firmly held in both hands, with the left hand
on the front hand-grip and the right hand on the rear hand grip, even if the operator is
left-handed.
6. Operation

Original Instructions
18
■ADJUSTING CARBURETOR
The carburetor on your unit has been factory adjusted, but may require fine tuning due
to change in operating conditions.
Before adjusting the carburetor, make sure that provided are clean air/fuel filters and
fresh, properly mixed fuel.
When adjusting, take the following steps:
Be sure to adjust the carburetor with the bar chain attached.
1. H and L needles are restricted within the
number of turn as shown below.
H needle –1/4
L needle –1/4
2. Start engine and allow it to warm up in low
speed for a few minutes.
3. Turn idle adjusting screw (T) counter-clockwise
so that saw chain does not turn. If idling speed is
too slow, turn the screw clockwise.
4. Make a test cut adjust the H needle for best
cutting power, not for maximum speed.
(1) Idle adjusting screw
(2) L needle
(3) H needle
■CHAIN BRAKE
The chain brake is a device which stops the chain instantaneously if the chain saw recoils
due to kickback.
6. Operation

Original Instructions
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Normally, the brake is activated automatically by
inertial force. It can also be activated manually by
pushing the brake lever (Front handle guard)
down toward the front.
When the brake operates, a white cone pops up
from the base of the brake lever.
(1) Front handle (2) Release (3) Brake (4) Front
handle guard
To release brake, pull up the front handle guard
toward the front handle till “click” sound is heard.
When the brake operates, release the throttle
lever to slow down the engine speed. Continuous
operation with the brake engaged will generate
heat from the clutch and may cause trouble.
Be sure to confirm brake operation on the
daily inspection.
How to confirm:
1) Turn off 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
confirm brake operation. Operating level varies by
bar size.
In case the brake is not effective, ask our dealer
inspection and repairing.
6. Operation