CSP3816 - UT74123A - 406 mm 16 in. 38cc Chainsaw
CSP4518 - UT74125A - 457 mm 18 in. 45cc Chainsaw
CSP4520 - UT74127A - 508 mm 20 in. 45cc Chainsaw
Your new chainsaw has been engineered and manuf actured to Homelite’s high standard for dependability, ease of operation
and operator safety. Properly cared for , it will giv e you y ears of rugged, trouble-free performance.
WARNING:To reduce the risk of injury , the user must read and understand the operator’s man ual.
Q General Safety Rules ................................................................................................................................................... 3-4
QQ
QQ
Q Specific Safety Rules................................................................................................................................................... 5-6
Q Bar and Chain Combination ........................................................................................................................................... 37
Servicing requires extreme care and knowledge and
should be performed only by a qualified service
technician. When servicing use only identical Homelite
replacement parts.
For safe operation, read and understand all instructions
before using the chainsaw. Follow all safety instructions.
Failure to follow all safety instructions listed below may
result in serious personal injury.
WARNING:
Carefully read through this entire operator’s manual
before using your new saw. Pay close attention to the
Safety Rules and all Safety Alert Symbols including
Danger, Warning and Caution. These safety rules are
for your safety and to prevent possible serious injury.
If you use your saw properly and only for what it is
intended, you will enjoy years of safe, reliable
service.
Look for this symbol to point out important safety precautions.
It means attention!!! Your safety is involved.
WARNING:
The operation of any tool can result in foreign objects being thrown into the eyes, which may
cause severe eye injury. Before beginning tool operation, always wear safety goggles or
safety glasses with side shields and a full face shield when needed. We recommend Wide
Vision Safety Mask for use over glasses or standard safety glasses with side shields. Always
wear eye protection.
UK - Page 2
GENERAL SAFETY RULES
WARNING:
The warnings, labels and instructions found in this
section of the operator’s manual are for your safety.
Failure to follow all instructions may result in serious
personal injury.
Safe operation of this tool requires that you read and
understand this operator’s manual and all labels affixed to
the tool. Safety is a combination of using common sense,
staying alert, and knowing how your saw works.
READ ALL INSTRUCTIONS
QQ
Q KNOW YOUR TOOL. Read the operator’s manual
QQ
carefully . Learn the saw’s applications and limitations as
well as the specific potential hazards related to this
tool.
QQ
Q CHAINSAWS are designed for cutting wood only .
QQ
QQ
Q KICK-BACK MAY OCCUR WHEN THE NOSE OR TIP
QQ
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 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 ma y
cause you to lose control of the sa w, which could result
in serious personal injury. DO NOT rely e xclusiv ely on
the safety devices built into the saw. As a chainsaw
user, you should take several steps to keep cutting jobs
free from accident or injury .
1. With a basic understanding of kick-back, you can
reduce or eliminate the element of surprise. Sudden
surprise contributes to accidents.
2. Keep a good firm grip on the saw with both hands
when the engine is running. Place your right hand on
the rear handle and your left hand on the front handle
with thumbs and fingers encircling the chainsaw
handles. A firm grip together with a stiff left arm will
help you maintain control of the saw if kick-back
occurs.
3. Make sure that the area in which you are cutting is
free from obstructions. DO NOT let the nose of the
guide bar contact a log, branch, fence or any other
obstruction which could be hit while you are operating
the saw .
4. Cut at high engine speeds. Always cut with the
engine running at full speed. Fully squeeze the
throttle trigger and maintain a steady cutting speed.
5. Do not overreach or cut above shoulder height.
6. Follow the manufacturer’s sharpening and mainte-
nance instructions for the saw chain.
7. Only use replacement bars and chains specified by
the manufacturer or the equivalent.
QQ
Q DO NOT OPERATE A CHAINSAW WITH ONE HAND.
QQ
Serious injury to the operator, helpers and/or bystanders
may result from one-handed operation. A chainsaw is
intended for two-handed use.
QQ
Q DO NOT OPERATE A CHAINSAW WHEN YOU ARE
QQ
FATIGUED. Never operate a chainsa w when you are
tired or under the influence of medication, drugs or
alcohol.
QQ
Q USE SAFETY FOOTWEAR. Wear snug-fitting clothing,
QQ
protective gloves and eye, hearing and head protection
devices.
QQ
Q DO NOT STAND ON ANY UNSTABLE SURFACE while
QQ
using your chainsaw. This includes ladders, scaff olding,
trees etc.
QQ
Q USE CAUTION WHEN HANDLING FUEL. Move the
QQ
chainsaw at least 9 m (25 ft) from the refuelling point
before starting the engine.
QQ
Q DO NOT ALLOW OTHER PERSONS to be near the
QQ
chainsaw when starting or cutting with the chainsaw .
Keep b ystanders and animals out of the work area.
QQ
Q DO NOT START CUTTING until you ha ve a clear work
QQ
area, secure footing and a planned retreat path from the
falling tree.
UK - Page 3
GENERAL SAFETY RULES
Q KEEP ALL PARTS OF YOUR BODY away from the sa w
chain when the engine is running.
QQ
Q ALWAYS CARRY THE CHAINSAW WITH THE ENGINE
QQ
STOPPED AND THE BRAKE ENGAGED, the guide bar
and saw chain to the rear , and the silencer a wa y from
your body . When transporting the chainsaw , use the
appropriate guide bar scabbard.
QQ
Q DO NOT OPERATE A CHAINSAW THAT IS DAMAGED,
QQ
improperly adjusted, or not completely and securely
assembled. Be sure that the saw chain stops moving
when the throttle control trigger is released.
QQ
Q TURN OFF THE ENGINE before putting the chainsaw
QQ
down. DO NOT lea ve the engine running unattended.
As an additional safety precaution, apply the chain brake
before putting down the sa w .
QQ
Q USE EXTREME CAUTION when cutting small-size
QQ
brush and saplings because slender material may catch
the saw chain and be whipped toward you or pull you
off balance.
QQ
Q WHEN CUTTING A LIMB under tension, be alert for
QQ
spring-back so you will not be struck when the tension
in the wood fibres is released.
QQ
Q KEEP THE HANDLES dry, clean and free of oil or
QQ
fuel mixture.
QQ
Q OPERATE THE CHAINSAW ONLY in well v entilated
QQ
areas.
QQ
Q DO NOT OPERATE A CHAINSAW IN A TREE unless
QQ
you hav e been specifically trained to do so.
QQ
Q ALL CHAINSAW SERVICE, other than the items listed
QQ
in the instruction manual, and all maintenance should
be performed by competent chainsaw service personnel.
For e xample, if improper tools are used to remov e the
flywheel or if an improper tool is used to hold the
flywheel in order to remove the clutch, structural
damage to the flywheel may occur and subsequently
cause the flywheel to burst.)
QQ
Q KEEP ALL PARTS OF YOUR BODY awa y from the sa w
QQ
chain when the engine is running.
QQ
Q KEEP SAFE-T-TIP ANTI-KICK-BACK NOSE GUARD
QQ
properly mounted on the guide bar to prevent rotational
kick-back.
QQ
Q FOLLOW THE SHARPENING and maintenance
QQ
instructions for the saw chain.
QQ
Q USE ONLY THE REPLACEMENT GUIDE BARS and
QQ
low kick-back chains specified for your saw.
QQ
Q DO NOT adapt your power head to a bow guide or use it
QQ
to power any attachments or devices not listed for
your saw.
QQ
Q SAVE THESE INSTRUCTIONS. Refer to them
QQ
frequently and use to instruct other users. If you lend
someone this tool, lend them these instructions too.
UK - Page 4
SPECIFIC SAFETY RULES
WARNING:
The warnings, labels and instructions found in this
section of the operator’s manual are for your safety.
Failure to follow all instructions may result in serious
personal injury.
GENERAL PRECAUTIONS
QQ
Q DO NOT CUT VINES and/or small underbrush less than
QQ
76 mm (3 in.) in diameter.
QQ
Q SILENCER SURFACES ARE VERY HOT during and
QQ
after operation of the chainsaw; keep all body parts
away from the silencer. Serious burns may occur if
contact is made with the silencer.
QQ
QALWAYS HOLD THE CHAINSAW WITH BOTH HANDS
QQ
when the engine is running. Use a firm grip with thumbs
and fingers encircling the chainsaw handles.
QQ
Q NEVER LET ANYONE USE YOUR CHAINSAW who has
QQ
not received adequate instructions in its proper use.
This applies to hired as well as privately owned saws.
QQ
Q BEFORE YOU START THE ENGINE, make sure the
QQ
saw chain is not contacting any object.
QQ
Q OPERATE THE CHAINSAW only in well ventilated areas.
QQ
SAFETY APPAREL
QQ
Q Wear snug-fitting clothing. Always wear heavy, long
QQ
trousers, boots and gloves. Do not wear jewellery,
shorts, sandals, or go barefoot. Do not wear loose fitting
clothing which could be drawn into the engine or catch
the chain or underbrush. Wear overalls, jeans or chaps
made of cut-resistant material or ones that contain
cut-resistant inserts. Secure hair so that it is above
shoulder level.
QQ
Q Wear non-slip safety footwear and heavy-duty gloves to
QQ
improve your grip and to protect your hands.
QQ
Q Wear eye, hearing and head protection when operating
QQ
this equipment.
REFUELLING DO NOT SMOKE!)
Q T o reduce the risk of fire and b urn injury, handle fuel with
care. It is highly flammable.
QQ
Q Mix and store fuel in a container approved for petrol.
QQ
QQ
Q Mix fuel outdoors where there are no sparks or flames.
QQ
QQ
Q Select bare ground, stop the engine, and allow it to cool
QQ
before refuelling.
QQ
Q Loosen the fuel cap slowly to release pressure and to
QQ
keep fuel from escaping round the cap.
QQ
Q Tighten the fuel cap securely after refuelling.
QQ
QQ
Q Wipe spilled fuel from the unit. Move 9 m (25 ft.) away
QQ
from refuelling site before starting engine.
QQ
Q Never attempt to burn off spilled fuel under any
QQ
circumstances.
BASIC PRECAUTIONS IN THE CUTTING/
WORK AREA
QQ
Q Do not operate a chainsaw in a tree.
QQ
QQ
Q Do not cut from a ladder: this is extremely dangerous.
QQ
QQ
Q Keep bystanders and animals out of the work area. Do
QQ
not allow other persons to be nearby during starting or
cutting with the chainsaw .
NOTE: The size of the w ork area depends on the job
being performed as well as the size tree or work piece
involv ed. For e xample, felling a tree requires a larger work
area than making other cuts such as bucking cuts etc.
UK - Page 5
SPECIFIC SAFETY RULES
PUSH AND PULL
The reaction force is always opposite to the direction the
chain is moving. Thus , the operator must be ready to
control the PULL when cutting on the bottom edge of the
bar and the PUSH when cutting along the top edge.
PULL
PUSH
Fig. 1
MAINTENANCE PRECAUTIONS
Never operate a chainsaw that is damaged, improperly
adjusted, or not completely and securely assembled. Be
sure that the saw chain stops moving when the throttle
control trigger is released. If the saw chain moves at idling
speed, the carburettor may need adjusting. Refer to
“Operation” later in this manual. If the saw chain still
moves at idling speed after adjustment has been made,
contact a Homelite service dealer for adjustment and
discontinue use until the repair is made.
WARNING:
All chainsaw service, other than items in the operator’s
manual maintenance instructions, should be performed
by competent chainsaw service personnel. If improper
tools are used to remove the flywheel or clutch, 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 burst with possible serious injury.
KICK-BACK
Kick-back is a dangerous reaction which may lead to
serious injury. Do not rely only on the safety devices
provided with your saw. As a chainsaw user, you must take
special safety precautions to help keep your cutting jobs
free from accident or injury.
NOTE: See the “Operation” section later in this manual for
added information on kick-back and how to avoid serious
personal injury.
NOTE: Your chainsaw has been fully factory tested. It is
normal to find some slight oil residue on the saw.
UK - Page 6
SYMBOLS
Important: Some of the following symbols may be used on your tool. Please study them and learn their meaning. Proper
interpretation of these symbols will allow you to operate the tool better and more safely.
SYMBOLNAMEEXPLANATION
Safety Alert Symbol
Read Your Operator’s Manual
Eye, Hearing and Head Protection
SAFE-T-TIP® Nose Guard
No Smoking
Operate with Two Hands
Indicates danger, warning or caution. It means
attention!!! Your safety is involved.
Your manual contains special messages to bring
attention to potential safety concerns and machine
damage, as well as helpful operating and servicing
information. Please read all the information carefully to
avoid injury and machine damage.
Wear eye, hearing and head protection when operating
this equipment.
The SAFE-T-TIP® nose guard on the guide bar helps
prevent kick-back.
No smoking, sparks or open flame.
Hold and operate the saw properly with both hands.
RUN
“O”
STOP
One Handed
Carbon Monoxide
Kick-back
Bar Nose Contact
Gloves
Switch
Do not operate the saw using only one hand.
Engines produce carbon monoxide which is an odourless,
deadly poison. Do not operate in an enclosed area.
Danger – beware of kick-back.
Avoid bar nose contact.
Wear non-slip gloves.
To stop the engine, move the switch to the “O” STOP
position.
I = ON to Run
O = OFF to Stop
UK - Page 7
SYMBOLS
No SmokingDo not smoke when mixing fuel or filling fuel tank.
PetrolUse unleaded petrol intended for motor vehicle use
with an octane rating of 87 [R + M] / 2) or higher.
OilUse 2-cycle oil for air-cooled engines.
Mix Petrol and OilMix the fuel mix thoroughly and also each time
before refuelling.
SAVE THESE INSTRUCTIONS
UK - Page 8
SPECIFICATIONS
Weight - No bar, chain, fuel or oil.............................................................................................................................. 4.4 kg
Fuel tank capacity ................................................................................................................................................. 575 cm
Oil tank capacity..................................................................................................................................................... 350 cm
Bar lengths .........................................................................................................................................................33 - 46 cm
Chain pitch ............................................................................................................................................................ 8.25 mm
Chain gauge........................................................................................................................................................... 1.25 mm
Chain type ......................................................................................................................... Semi-Chisel, LoPro, Skip Tooth
Engine displacementCSP3816 ..................................................................................... 38 cm
CSP4518 and CSP4520 .............................................................. 45 cm
Maximum engine power ISO 7293)CSP3816 .....................................................................................1.6 kW
Maximum engine power ISO 7293)CSP4518 AND CSP4520 .............................................................1.9 kW
Maximum engine speed with attachment ..........................................................................................................12,500 min
Idle engine speed....................................................................................................................................2,600 - 3,400 min
Sound pressure level ISO 7182)CSP3816 ........................................................................99.4 LpA / dBA
CSP4518 and CSP4520 .................................................99.4 LpA / dBA
Sound power level ISO 9207)CSP3816 ................................................................... 112.0 LwA / dBpA
3
3
3
3
-1
-1
Vibration ISO 7505):
Front HandleCSP3816 .................................................................................. 4.3 M/S
Rear HandleCSP3816 ................................................................................ 10.7 M/S
Front HandleCSP4518 and CSP4520 ........................................................... 4.3 M/S
Rear HandleCSP4518 and CSP4520 ......................................................... 10.7 M/S
CSP4518 and CSP4520 ............................................ 112.0 LwA / dBpA
2
2
2
2
UK - Page 9
FRONT HAND GUARD/
CHAIN BRAKE
FEATURES
TRIGGER
RELEASE
SILENCER
CHAIN OIL CAP
CYLINDER
COVER
PRIMER BULB
FRONT
HANDLE
CHOKE LEVER
STARTER GRIP
CHAIN
CATCHER
SAFE-T-TIP
CARBURETTOR
ADJUSTMENT
®
REAR
HANDLE
STARTER/FAN HOUSING
ON/OFF SWITCH
FUEL MIX CAP
UK - Page 10
STOP
THROTTLE
TRIGGER
Fig. 2
OPERATION
For your saf ety, study this entire manual before operating
the saw . Pay particular attention to the precautions and
instructions listed in the operator’s manual.
WEAR EYE
WEAR HEAD
PROTECTION
WEAR HEARING
PROTECTION
WEAR “NON-SLIP”
GLOVES
WEAR TRIM-FITTING CLOTHING. AVOID SCARVES OR
OTHER LOOSE CLOTHING WHICH COULD GET
CAUGHT IN THE MACHINE
PROTECTION
WEAR HEAVY DENIM
OR CHAPS
WEAR STURDY
BOOTS
Fig. 3
SAFE-T-TIP
Fig. 4
Users, such as professional loggers who need to draw the
tip through the cut, make boring cuts, or cut logs bigger
than the bar length, should reinstall the SAFE-T-TIP® as
soon as those cuts are complete. When cutting without the
SAFE-T-TIP®, the user must use proper techniques as
shown in the manual to avoid kick-back.
NOTE: Refer to “Maintenance” later in this manual for
instructions on reinstalling the SAFE-T -TIP® nose guard.
LOW KICK-BACK SAW CHAIN
The rakers (depth gauges) ahead of each cutter can
minimise the force of a kick-back reaction by preventing
the cutters from digging in too deeply at the kick-back
zone. Only use replacement chain which is equivalent to
the original chain or has been certified as a low
kick-back chain.
As saw chains are sharpened, they lose some of the low
kick-back qualities and extra caution is required.
WARNING:
The warnings and instructions in this section of the
operator’s manual are for your safety and to prevent
serious personal injury.
UNDERSTANDING YOUR CHAINSAW
SAFETY DEVICES
SAFE-T-TIP® ANTI-KICK-BACK NOSE GUARD
The SAFE-T-TIP® prevents kic k-back because it covers the
tip of the bar where rotational kick-back is generated.
Inexperienced persons should never attempt to cut when
the SAFE-T-TIP® has been removed from the bar tip .
GUIDE BARS
Generally, guide bars with small radius tips have somewhat
lower kick-back potentials.
When making a replacement, be sure to order one of the
Homelite bars listed for your saw in this operator’s manual.
The proper size SAFE-T-TIP® nose guard comes installed
on the bar. Use only guide bars that ha v e a provision for
mounting the SAFE-T-TIP®.
UK - Page 11
OPERATION
CHAIN BRAKE
Chain brakes are designed to quickly stop the chain from
rotating. When the chain brake lever/hand guard is pushed
towards the bar, the chain should stop immediately.
A chain brake does not prevent kick-back.
The chain brake should be cleaned and tested daily. Refer
to “Operation” later in this manual for additional information.
WARNING:
Even with daily cleaning of the mechanism, the
dependability of a chain brake to perform under field
conditions cannot be certified. Keep the SAFE-T-TIP
nose guard on the saw guide bar and use proper
cutting techniques.
RUN POSITION
WARNING:
KICK-BACK occurs when the moving chain contacts
an object at the upper portion of the tip of the guide
bar or when the wood closes in and pinches the saw
chain in the cut. Contact at the upper portion of the
tip of the guide bar can cause the chain to dig into
the object and stop the chain for an instant. The
result is a lightning-fast, reverse reaction which kicks
the guide bar up and back towards the operator. If
the saw chain is pinched along the top of the guide
bar, the guide bar can be driven rapidly back toward
the operator. Either of these reactions may cause
loss of saw control which can result in serious injury.
Do not rely exclusively upon the safety devices built
into the saw. As a chainsaw user, you should take
several steps to keep your cutting jobs free from
accident or injury.
KICK-BACK PRECAUTIONS
Rotational kick-back occurs when the moving chain contacts an object at the Kick-back Danger Zone of the guide
bar. The result is a lightning-f ast, re v erse reaction which
kicks the guide bar up and back tow ards the operator . This
reaction may cause loss of control which can result in
serious injury.
BRAKE
POSITION
Fig. 5
KICK-BACK DANGER
ZONE
Fig. 6
ROTATIONAL
KICK-BACK
Fig. 7
UK - Page 12
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