STIHL TS 420 Instruction Manual
Working safely with cut-off machines
{
Warning!
Read and follow all safety precautions in
Instruction Manual – improper use can cause
serious or fatal injury.
Contents
English
Safety Precautions and Working
Techniques 2
Sample applications 15
Cutting wheels 18
Composite resin cutting wheels 18
Diamond cutting wheels 18
Maintenance and Care 22
Main Parts 24
Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
This manual contains the safety
precautions and recommended cutting
techniques outlined in STIHL instruction
manuals for gasoline-powered cut-off
machines. Even if you are an
experienced cut-off machine user, it is in
your own interest to familiarize yourself
with the latest instructions and safety
precautions regarding your cut-off
machine.
Please note that the illustrations in the
chapter "Main Parts of the Machine" in
this manual show the cut-off machine
STIHL Cutquik
®
TS 420.
Other cut-off machine models may have
different parts and controls. You should
therefore always refer to the instruction
manual of your particular cut-off
machine model.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
manual.
{
© ANDREAS STIHL AG & Co. KG, 2010
0457-186-3021. M0.B10.xxx.
0000000552_001_GB
Working safely with cut-off machines
1
English
Safety Precautions and
Working Techniques
The use of any cut-off
machine may be hazardous. Because a cut-off
machine is a high-speed,
fast-cutting power tool,
special safety precautions must be observed to
reduce the risk of personal injury and fire.
It is important that you
read, fully understand
and observe the following
safety precautions and
warnings. Read the
instruction manual and
the safety precautions
periodically.
Warning!
Careless or improper use of any cut-off
machine may cause serious or fatal
injury.
Have your STIHL dealer show you how
to operate your cut-off machine.
Observe all applicable national, state
and local safety regulations, standards
and ordinances.
Warning!
Your cut-off machine is for professional
use only. Do not lend or rent your cut-off
machine without the instruction manual.
Be sure that anyone using it understands the information contained in this
manual.
A first-time operator should obtain
practical instruction before using the
machine. Employers should establish a
training program for operators of
gasoline-powered, hand-held portable
cut-off machines to assure safe
operation of these machines. These
safety precautions and warnings apply
to the use of all current STIHL Cutquiks.
Warning!
Use your cut-off machine only for
authorized uses. For instance, it is not
suitable for cutting wood or wooden
objects. Misuse may result in personal
injury or property damage, including
damage to the machine.
Warning!
Minors should never be allowed to use a
cut-off machine. Bystanders, especially
children, and animals should not be
allowed in the area where a cut-off
machine is in use. Never let the cut-off
machine run unattended.
Different models may have different
parts and controls. See the appropriate
section of your instruction manual for a
description of the controls and function
of the parts of your model cut-off
machine.
Safe use of a cut-off machine involves
1. the operator
2. the power tool
3. the use of the power tool.
THE OPERATOR
Physical Condition
You must be in good physical condition
and mental health and not under the
influence of any substance (drugs,
alcohol, etc.) which might impair vision,
dexterity or judgment. Do not operate a
cut-off machine when you are fatigued.
Be alert – if you get tired while operating
your cut-off machine, take a break;
tiredness may result in loss of control.
Working with any cut-off machine can be
strenuous. If you have any condition that
might be aggravated by strenuous work,
check with your doctor before operating
a cut-off machine.
Warning!
Prolonged use of cut-off machines (or
other machines) exposing the operator
to vibrations may produce whitefinger
disease (Raynaud's phenomenon) or
carpal tunnel syndrome. These conditions reduce the hand's ability to feel
and regulate temperature, produce
numbness and burning sensations and
cause nerve and circulation damage
and tissue necrosis. All factors which
contribute to whitefinger disease are not
known, but cold weather, smoking and
diseases or physical conditions that
affect blood vessels and blood transport, as well as high vibration levels and
long periods of exposure to vibration are
mentioned as factors in the development of whitefinger disease. In order to
reduce the risk of whitefinger disease
and carpal tunnel syndrome, please
note the following:
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Working safely with cut-off machines
English
– STIHL cut-off machines are
equipped with an anti-vibration
("AV") system designed to reduce
the transmission of vibrations
created by the machine to the
operator's hands. An AV system is
recommended for those persons
using cut-off machines on a regular
or sustained basis.
– Wear gloves and keep your hands
warm.
– Keep the AV system well
maintained. A cut-off machine with
loose components or with damaged
or worn AV elements will tend to
have higher vibration levels.
– Maintain a firm grip at all times, but
do not squeeze the handles with
constant, excessive pressure. Take
frequent breaks.
All the above-mentioned precautions do
not guarantee that you will not sustain
whitefinger disease or carpal tunnel
syndrome. Therefore, continual and
regular users should monitor closely the
condition of their hands and fingers. If
any of the above symptoms appear,
seek medical advice immediately.
Warning!
The ignition system of your unit produces an electromagnetic field of a very
low intensity. This field may interfere
with some pacemakers. To reduce the
risk of serious or fatal injury, persons
with a pacemaker should consult their
physician and the pacemaker manufacturer before operating this tool.
Proper Clothing
Warning!
To reduce the risk of
injury, the operator
should wear proper protective apparel.
Clothing must be sturdy and snug-fitting,
but allow complete freedom of
movement. Avoid loose-fitting jackets,
scarfs, neckties, jewelry, flared or cuffed
pants, unconfined long hair or anything
that could become caught on any
obstacles or moving parts of the unit.
Wear overalls or long pants to protect
your legs. Do not wear shorts.
Warning!
When cutting metal, a cut-off machine
generates sparks that can ignite clothing. Most fabrics used in clothing are
flammable – even flame-retardant fabrics will ignite at higher temperatures.
To reduce the risk of burn injury STIHL
recommends wearing clothing made of
leather, wool, flame-retardant-treated
cotton or a tightly woven, heavier cotton
such as denim. Some flame-retardant
synthetic fabrics are also suitable, but
others such as polyester, nylon, rayon
and acetate can melt during a fire into a
tar-like matter that burns into the skin.
Check the clothing manufacturer's
instructions. Keep clothing free of oil,
fuel, grease and other flammable
substances.
Always wear gloves
when handling the cut-off
machine. Heavy-duty,
nonslip gloves improve
your grip and help to protect your hands.
Good footing is important
in cut-off machine work.
Wear sturdy boots with
nonslip soles. Steel-toed
safety boots are
recommended.
Warning!
Loose objects may be thrown toward
the operator by the cutting tool.
To reduce the risk of
injury to your eyes never
operate a cut-off machine
unless wearing goggles
or properly fitted safety
glasses with adequate
top and side protection
complying with
ANSI Z 87.1. Proper eye
protection is a must.
Wear an approved safety hard hat to
protect your head. Cut-off machine
noise may damage your hearing. Always
wear sound barriers (ear plugs or ear
mufflers) to help protect your hearing.
Regular users should have their hearing
checked regularly.
Working safely with cut-off machines
3
English
Warning!
When wet cutting at the
recommended flow rate
is not utilized, the operator should always wear
a respirator approved
by NIOSH / MSHA for
the material being cut to reduce the risk
of serious or fatal respiratory illness. For
additional details and warnings on this
subject, see information under "Working
Conditions" in this instruction manual.
THE POWER TOOL
For illustrations and definitions of the
parts of the cut-off machine, see the
chapter "Main Parts."
Warning!
Never modify a cut-off machine in any
way. Only attachments supplied by
STIHL or expressly approved by STIHL
for use with the specific STIHL cut-off
machine models are authorized.
Although certain unauthorized attachments are useable with the STIHL
powerhead, their use may, in fact, be
extremely dangerous.
Abrasive Wheels
Warning!
Before mounting the cutting wheel,
make sure that the maximum operating
wheel speed is above or equal to the
spindle speed of your cut-off machine
as provided in the specifications of this
manual. A wheel that is not so rated
may shatter or break and poses a threat
of serious or fatal injury to the operator
and other nearby persons.
Abrasive wheels for free-hand cutting
are subjected to particularly high
bending and compression stresses.
Warning!
Unauthorized wheels may be more
likely to shatter or break. Use only
STIHL wheels or other authorized
wheels with approved RPM ratings.
Read and follow any addional safety
precautions that accompany the wheel.
Warning!
Inspect the abrasive
wheel frequently and
replace immediately if
the abrasive wheel is
cracked or warped.
Cracked or warped
wheels may shatter or break and cause
serious or fatal personal injury. Out-ofround or unbalanced abrasive wheels
increase vibration and reduce the service life of the cut-off machine.
Unauthorized diamond abrasive wheels
that utilize poor quality steel cores, that
are not properly tensioned, or that have
other design or manufacturing defects
may begin to wobble during use, which
can cause wheel breakage. Such
wobbling can also lead to a severe
binding of the wheel in the kerf, that,
under certain circumstances, can then
result in serious or fatal injury from
reactive forces. See the section entitled
"Reactive Forces including Kickback."
Never use a wheel that wobbles or that
has ever wobbled. Even though such a
wheel may temporarily cease to wobble,
e.g., if run without load, it will always be
prone to wobble again under certain
conditions. Replace it immediately
before further use.
Composite abrasive wheels are heat
sensitive. Always store your cut-off
machine in a place where a composite
wheel is not exposed to direct sunlight or
other sources of heat. Store spare
composite wheels in a dry place where
there is no risk of frost damage. Failure
to follow these directions may cause the
wheel to shatter or crack in use causing
serious or fatal injury.
Warning!
Never use circular saw
blades, carbide tipped
blades, rescue blades,
wood-cutting blades or
toothed blades of any
nature. They can cause
severe personal injury from blade contact, thrown objects and / or reactive
forces, including kickback. See section
on "Reactive Forces." Your STIHL
dealer stocks a range of special abrasive wheels for the many applications of
the cut-off machine.
4
Working safely with cut-off machines
English
Warning!
Use of the wrong abrasive wheel or the
cutting of material for which the wheel
was not designed may cause the wheel
to shatter causing serious or fatal injury.
Only use the abrasive wheel approved
for the type of material to be cut. There
are different types of abrasive wheels,
each specially marked. With respect to
composite wheels, for example:
1. Stone
Also can be used for concrete,
masonry, reinforced concrete and
brick cutting.
2. Steel
Can be used for all ferrous metal
cutting.
3. Asphalt
Also can be used for aggregate
concrete cutting.
4. Ductile iron
Also can be used for certain grades
of cast iron (SG 17-24), bronze and
copper cutting.
For cutting composite materials please
ask your STIHL dealer.
They are not normally suitable for cutting
metal or other materials.
Wet or dry cutting is possible. Water
attachments are included with your
STIHL cut-off machine. See the
appropriate section of your instruction
manual.
Warning!
Do not remount a used diamond abrasive wheel without first inspecting for
under-cutting, flatness, core fatigue,
segment damage or loss, signs of overheating (discoloration) and possible
arbor hole damage. See the chapter
"Diamond Cutting Wheels." Check the
wheel for cracks and make sure that no
pieces have broken off the wheel before
use.
Always fit the wheel so that the arrow on
the wheel points in the direction of the
rotation of the spindle.
THE USE OF THE POWER TOOL
Transporting the STIHL Cutquik
Warning!
To reduce the risk of injury from unintended activation and / or contact with a
moving wheel, always stop the engine
before putting a cut-off machine down or
carrying it. The abrasive wheel continues to rotate (coast down) for a short
while after the throttle trigger is released
(flywheel effect). Bring the wheel to a
stop by lightly contacting the bottom of
the wheel with a hard surface or wait
until the wheel comes to a complete
stop on its own. Carrying a cut-off
machine with the engine running is
extremely dangerous. Accidental acceleration of the engine can cause the
wheel to rotate. Avoid touching the hot
muffler.
By hand: When carrying your cut-off
machine by hand, the engine must be
stopped and the cut-off machine must
be in the proper position. Grip the front
handle and place the muffler at the side
away from the body.
Diamond Abrasive Wheels
Diamond abrasive wheels have a much
better cutting performance than
composite abrasive wheels. The
diamond wheels are steel centered, and
diamond particles are imbedded in their
cutting edges.
They can be used for concrete, asphalt,
natural stone, clay pipe, brick and the
like.
Working safely with cut-off machines
Warning!
Always protect the cutting wheel from
hitting the ground or any other objects.
Damaged wheels may shatter and
cause serious or fatal injury.
By vehicle: Properly secure your cut-off
machine to prevent turnover, fuel
spillage and damage to the cut-off
machine. Never transport with cutting
wheel mounted. A wheel damaged
5
English
during transportation may shatter during
operation and cause serious personal
injury.
Fuel
Your STIHL power tool uses an oilgasoline mixture for fuel (see the
chapter on "Fuel" of your instruction
manual.)
Warning!
Gasoline is an extremely
flammable fuel. If spilled
and ignited by a spark or
other ignition source, it
can cause fire and seri-
ous burn injury or
property damage. Use extreme caution
when handling gasoline or fuel mix. Do
not smoke or bring any fire or flame near
the fuel or the power tool. Note that
combustible fuel vapor may escape
from the fuel system.
Warning!
Dust may collect on the powerhead,
especially around the carburetor, and
may absorb gasoline resulting in danger
of fire. Clean dust from the powerhead
regularly.
Fueling Instructions
Warning!
Fuel your power tool in well-ventilated
areas, outdoors. Always shut off the
engine and allow it to cool before refueling. Gasoline vapor pressure may
build up inside the fuel tank depending
on the fuel used, the weather conditions
and the tank venting system.
In order to reduce the risk of burns and
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap on your power tool carefully so as to
allow any pressure build-up in the tank
to release slowly. Never remove the fuel
filler cap while the engine is running.
Select bare ground for fueling and move
at least 10 feet (3 m) from the fueling
spot before starting the engine. Wipe off
any spilled fuel before starting your
machine.
Warning!
Check for fuel leakage
while refueling and during operation. If fuel
leakage is found, do not
start or run the engine
until the leak is fixed and
any spilled fuel has been wiped away.
Take care not to get fuel on your clothing. If this happens, change your
clothing immediately.
Warning!
If fuel gets spilled on clothes, especially
trousers, it is very important to change
clothes immediately. Do not rely upon
evaporation. Flammable quantities of
fuel may remain on clothes after a spill
for longer than expected. Cutting metal
with a cut-off machine when clothes are
wet or damp from gasoline is extremely
dangerous, as the operator's clothes
might catch fire and cause serious or
fatal injury.
Warning!
An improperly tightened fuel cap can
loosen or come off and spill quantities of
fuel.
Different cut-off machines may be
equipped with different fuel filler caps:
Bayonet Fuel Filler Cap
Never use a tool to open or close the
bayonet fuel filler cap, as this could
damage the cap and cause fuel to leak
out.
The bayonet fuel filler cap must be
closed with care after refuelling.
6
Working safely with cut-off machines
English
Fuel Filler Cap with Screw Thread
Tighten the fuel filler cap
as securely as possible
after refuelling.
This reduces the risk of the cap working
loose due to engine vibrations and fuel
leaking out.
Warning!
Never attempt to force the cap open by
using a tool. It may damage the cap and
allow fuel to leak.
Before use, make sure that the fuel cap
has been properly tightened and any
spilled fuel wiped away. Check for fuel
leakage while refueling and during
operation. If a fuel leak is suspected, do
not start or run the engine until the leak
is fixed and spilled fuel has been wiped
away.
Before Starting
For assembly, follow the procedure
described in the appropriate section of
your instruction manual.
Never operate a cut-off machine that is
damaged, improperly adjusted or not
completely and securely assembled.
Check machine that it is ready for proper
operation.
Keep the handles dry, clean and free of
oil and fuel.
Warning!
Before operation of your cut-off
machine, be sure the controls (e.g.
throttle trigger, throttle trigger lockout,
stop switch) and the safety devices are
working properly, the carburetor idle
and maximum speed are correctly
adjusted, the wheel is properly
mounted, and the wheel guard is in
place and securely fastened to your
unit. All wheels should be carefully
inspected for good condition before
mounting.
Adjust the wheel guard
so that sparks, dust and
cut material are deflected
away from the operator,
and cannot reach flammable surroundings. See
section "Operating
Instructions" of your
instruction manual.
Warning!
Check that the spark plug boot is
securely mounted on the spark plug – a
loose boot may cause arcing that could
ignite combustible fumes and cause a
fire.
Proper tensioning of the ribbed V-belt is
important. In order to avoid an incorrect
setting, the tensioning procedure must
be followed as described in your
manual. Always make sure the
hexagonal collar nuts for the cast arm
are tightened securely.
Check ribbed belt tension after one hour
of operation and correct if necessary.
Starting
002BA058 KN
Warning!
Your cut-off machine is a one-person
tool. Do not allow other persons to be
near a running cut-off machine. Start
and operate your cut-off machine without assistance. For specific starting
instructions, see the appropriate section
of your instruction manual.
Do not drop start. This method is very
dangerous because you may lose
control of the cut-off machine. Place the
cut-off machine on firm ground or other
solid surface in an open area. Maintain
good balance and secure footing. Be
absolutely sure that the cutting wheel is
clear of you and all other obstructions
and objects, including the ground. When
the engine starts at starting-throttle,
engine speed will be fast enough for the
clutch to engage the belt pulley and turn
Working safely with cut-off machines
7
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