Solo USA Chainsaw MS 270, 280 User Manual

STIH)  
Instruction Manual  
Manual de instrucciones  
STIHL MS 270, 280  
Warning!  
This saw is capabale of servere kickback  
which may cause serious or fatal injury. Only  
for users with extraordinary cutting needs and  
experience and training dealing with kickback.  
Chainsaws with significantly reduced kickback  
potential are available. STIHL recommends  
the use of STIHL reduced kickback bar and  
low kickback chain.  
Advertencia!  
Esta sierra es capaz de causar contragolpes  
severos, los cuales pueden causar lesiones  
graves o mortales. Sólo es apta para usuarios  
con necesidades extraordinarias de corte y  
mucha experiencia y capacitación en el  
manejo de los contragolpes. Existen sierras  
con un potentical mucho menor de causar  
contragolpes. STIHL recomienda usar una  
barra y cadena de contragolpe reducido de  
STIHL.  
Read and follow all safety precautions in  
Instruction Manual – improper use can cause  
serious or fatal injury.  
Lea y siga todas las precauciones de  
seguridad dadas en el manual de  
instrucciones – el uso incorrecto puede causar  
lesiones graves o mortales.  
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Contents  
Allow only persons who understand this  
Manual to operate your chainsaw.  
Maintaining and Sharpening  
Saw Chain ...................................... 53  
Maintenance Chart ......................... 57  
Main Parts of the Saw .................... 59  
Specifications ................................. 61  
Special Accessories ....................... 62  
Ordering Spare Parts ..................... 63  
Maintenance and Repairs .............. 63  
STIHL Incorporated Federal  
To receive maximum performance and  
satisfaction from your STIHL chainsaw,  
it is important that you read and  
understand the maintenance and safety  
precautions, starting on page 3, before  
using your chainsaw.  
Contact your STIHL dealer or the STIHL  
distributor for your area if you do not  
understand any of the instructions in this  
Manual.  
Emission Control Warranty  
Statement ....................................... 64  
Trademarks .................................... 66  
Fuel ................................................ 33  
Taking Care of Guide Bar ............... 43  
Because a chainsaw is a high-speed  
wood-cutting tool, some special safety  
precautions must be observed as with  
any other power saw to reduce the risk  
improve all of its products. As a result,  
engineering changes and improvements  
appearance of your chainsaw differs  
please contact your STIHL dealer for  
information and assistance.  
Checking the Spark Plug ................ 48  
Replacing Starter Rope  
and Rewind Spring ......................... 49  
Storing the Machine ........................ 51  
Checking and Replacing  
Chain Sprocket ............................... 52  
STIHl  
MS 270, MS 270 C, MS 280, MS 280 C  
1
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Guide to Using this Manual  
In addition to the operating instructions,  
this manual may contain paragraphs  
that require your special attention. Such  
paragraphs are marked with the  
symbols described below:  
Pictograms  
Equipment and features  
All the pictograms attached to the  
machine are shown and explained in  
this manual.  
This instruction manual may refer to  
several models with different  
features. Components that are not  
installed on all models and related  
applications are marked with an  
asterisk (*). Such components may  
be available as special accessories  
from your STIHL dealer.  
The operating and handling instructions  
are supported by illustrations.  
Warning where there is a risk of an  
accident or personal injury or  
serious damage to property.  
Symbols in text  
The individual steps or procedures  
described in the manual may be marked  
in different ways:  
Caution where there is a risk of  
damaging the machine or its  
individual components.  
Engineering improvements  
STIHL’s philosophy is to continually  
improve all of its products. As a result,  
engineering changes and improvements  
are made from time to time. If the  
operating characteristics or the  
appearance of your machine differ from  
those described in this manual, please  
contact your STIHL dealer for  
:
A bullet marks a step or procedure  
without direct reference to an  
illustration.  
Note or hint which is not essential  
for using the machine, but may  
improve the operator’s under-  
standing of the situation and result  
in better use of the machine.  
A description of a step or procedure that  
refers directly to an illustration may  
contain item numbers that appear in the  
illustration.  
Note or hint on correct procedure in  
order to avoid damage to the  
environment.  
assistance.  
Example:  
Therefore some changes, modifications  
and improvements may not be covered  
in this manual.  
Loosen the screw (1)  
Lever (2) ...  
2
MS 270, MS 270 C, MS 280, MS 280 C  
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Some Important Safety Precautions for Chain Saw Users  
Do not rely exclusively upon the safety  
devices built into your saw. As a  
chainsaw user, you should take several  
steps to keep your cutting jobs free from  
accident or injury.  
6. Follow manufacturer's sharpening  
and maintenance instructions for  
the saw chain.  
A.  
A Summary of Warnings on  
kickback and other Selected  
Risks – Taken Primarily from  
ANSI B 175.1 (See also the  
“Safety Precautions“ section of  
this Owner’s Manual)  
7. Only use replacement bars and  
chains specified by the  
manufacturer or the equivalent.  
1. With a basic understanding of  
kickback, you can reduce or  
eliminate the element of surprise.  
Sudden surprise contributes to  
accidents.  
8. Reduced kickback bars and low  
kickback chains are designed to  
reduce the risk of kickback injury.  
Ask your STIHL dealer about these  
devices.  
!Warning!  
Kickback may occur when the nose or  
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 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.  
2. Keep a good firm 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 chainsaw  
handles. A firm grip will help you  
reduce kickback and maintain  
B.  
Other Safety Precautions  
!Warning!  
1. Do not operate a chainsaw with one  
hand! Serious injury to the operator,  
helpers, bystanders, or any  
control of the saw. Don't let go.  
combination of these persons may  
result from one-handed operation. A  
chainsaw is intended to be used  
with two hands.  
3. Make sure the area in which you are  
cutting is free from obstructions. Do  
not let the nose of the guide bar  
contact a log, branch, or any other  
obstruction that could be hit while  
you are operating the saw.  
Section 5.11 of ANSI B 175.1-2000 sets  
certain performance and design criteria  
related to chainsaw kickback. STIHL has  
developed a color code system using  
green and yellow to help you select a  
powerhead, bar and chain combination  
that complies with the kickback  
requirements of the ANSI Standard.  
See the sections entitled "Safety  
Precautions" and "Specifications" of this  
manual.  
2. Do not operate a chainsaw when  
you are fatigued.  
3. Use safety footwear; snug-fitting  
clothing; protective gloves; and eye,  
hearing, and head protection  
devices.  
4. Cut at high engine speeds.  
5. Do not overreach or cut above  
shoulder height.  
MS 270, MS 270 C, MS 280, MS 280 C  
3
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4. Use caution when handling fuel.  
Move the chainsaw at least 10 feet  
(3 m) from the fueling point before  
starting the engine.  
10. Do not operate a chainsaw that is  
damaged, improperly adjusted, or  
not completely and securely  
17. All chainsaw service, other than the  
items listed in the Owner's Manual  
maintenanceinstructions, shouldbe  
performed by competent chainsaw  
service personnel.(For example, 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  
assembled. Be sure that the saw  
chain stops moving when the  
throttle trigger is released.  
5. Do not allow other persons to be  
near the chainsaw when starting or  
cutting with the chainsaw. Keep  
bystanders and animals out of the  
work area.  
11. Shut off the engine before setting  
the chainsaw down.  
12. Use extreme caution when cutting  
small size brush and saplings  
damage to the flywheel could occur  
and could subsequently cause the  
flywheel to burst).  
6. Do not start cutting until you have a  
clear work area, secure footing, and  
a planned retreat path from the  
falling tree.  
because slender material may catch  
the saw chain and be whipped  
toward you or pull you off balance.  
18. When transporting your chainsaw,  
use the appropriate chain guard  
(scabbard).  
7. Keep all parts of your body away  
from the saw chain when the engine  
is running.  
13. When cutting a limb that is under  
tension be alert for springback so  
that you will not be struck when the  
tension in the wood fibers is  
released.  
Other important safety precautions are  
contained in the body of the Owner's  
Manual, especially in the Safety  
Precautions.  
8. Before you start the engine, make  
sure that the saw chain is not  
contacting anything.  
14. Keep the handles dry, clean, and  
free of oil or fuel mixture.  
Note:  
9. Carry the chainsaw with the engine  
stopped, the guide bar and saw  
chain to the rear, and the muffler  
away from your body.  
15. Operate the chainsaw only in well-  
ventilated areas.  
When using a chainsaw for logging  
purposes, refer to the Code of Federal  
Regulations, Parts 1910 and 1928.  
16. Do not operate a chainsaw in a tree  
unless you have been specifically  
trained to do so.  
4
MS 270, MS 270 C, MS 280, MS 280 C  
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Safety Precautions and  
Working Techniques  
Because a chainsaw is a  
high-speed, fast-cutting  
power tool, special safety  
precautions must be  
observed to reduce the  
risk of personal injury.  
Most of these safety precautions and  
warnings apply to the use of all STIHL  
chainsaws. Different models may have  
different parts and controls. See the  
appropriate section of your instruction  
manual for a description of the controls  
and the function of the parts of your  
model.  
!Warning!  
Do not lend or rent your power tool  
without the instruction manual. Be sure  
that anyone using it understands the  
information contained in this manual.  
!Warning!  
The use of this machine may be  
hazardous.The saw chain has many  
sharp cutters. If the cutters contact your  
flesh, they will cut you, even if the chain  
is not moving. At full throttle, the chain  
speed can reach 67 mph (30 m/s).  
It is important that you  
read, fully understand and  
observe the following  
safety precautions and  
warnings. Read the  
Safe use of a chainsaw involves  
1. the operator  
2. the saw  
instruction manual and  
3. the use of the saw.  
the safety instructions periodically.  
Careless or improper use may cause  
serious or fatal injury.  
Use your chainsaw only for cutting  
wooden objects. It must not be used for  
any other purposes, since such misuse  
may result in an accident or damage to  
the machine.  
THE OPERATOR  
!Warning!  
Reactive forces, including kickback, can  
be dangerous. Pay special attention to  
the section on reactive forces.  
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  
this machine when you are fatigued.  
!Warning!  
Minors should never be allowed to use  
this power tool. Bystanders, especially  
children, and animals should not be  
allowed in the area where it is in use.  
Have your STIHL dealer show you how  
to operate your power tool. All safety  
precautions that are generally observed  
when working with an axe or a hand saw  
also apply to the operation of chainsaws.  
Observe all applicable federal, state and  
local safety regulations, standards and  
ordinances. When using a chain saw for  
logging purposes, for instance, refer to  
the OSHA regulations for “logging  
operations“ at 29 Code of Federal  
Regulations 1910.266.  
!Warning!  
!Warning!  
Be alert – if you get tired, take a break.  
Tiredness may result in loss of control.  
Working with any power tool can be  
strenuous. If you have any condition that  
might be aggravated by strenuous work,  
check with your doctor before operating  
this machine.  
To reduce the risk of injury to bystanders  
and damage to property, never let your  
power tool run unattended. When it is  
not in use (e.g. during a work break),  
shut it off and make sure that  
unauthorized persons do not use it.  
MS 270, MS 270 C, MS 280, MS 280 C  
5
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Keep the AV system well  
Proper Clothing  
!Warning!  
maintained. A power tool with loose  
components or with damaged or  
worn AV buffers will tend to have  
higher vibration levels.  
Keep the saw chain sharp. A dull  
chain will increase cutting time, and  
pressing a dull chain through wood  
will increase the vibrations  
!Warning!  
To reduce the risk of injury, the operator  
should wear proper protective apparel.  
Prolonged use of a power tool (or other  
machines) exposing the operator to  
vibrations may produce whitefinger  
disease (Raynaud's phenomenon) or  
carpal tunnel syndrome.  
Clothing must be sturdy  
and snug-fitting, but allow  
complete freedom of  
movement. Wear long  
pants made of heavy  
These conditions reduce the hand's  
ability to feel and regulate temperature,  
produce numbness and burning  
sensations and may cause nerve and  
circulation damage and tissue necrosis.  
transmitted to your hands.  
Maintain a firm grip at all times, but  
do not squeeze the handles with  
constant, excessive pressure. Take  
frequent breaks.  
material to help protect  
your legs from contact with branches or  
brush. To reduce the risk of cut injuries,  
wear pants or chaps that contain pads of  
cut retardant material.  
All factors which contribute to white-  
finger 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:  
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 closely monitor the  
condition of their hands and fingers. If  
any of the above symptoms appear,  
seek medical advice immediately.  
Avoid loose-fitting jackets, scarfs,  
neckties, jewelry, flared or cuffed pants,  
unconfined long hair or anything that  
could become caught on branches,  
brush or the moving parts of the unit.  
Secure hair so it is above shoulder level.  
Good footing is very  
important. Wear sturdy  
boots with nonslip soles.  
Steel-toed safety boots  
are recommended.  
!Warning!  
Most STIHL power tools are  
available 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 power tools on a regular or  
sustained basis.  
The ignition system of the STIHL 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.  
Wear gloves and keep your hands  
warm. Heated handles, which are  
available on some STIHL power-  
heads, are recommended for cold  
weather use.  
6
MS 270, MS 270 C, MS 280, MS 280 C  
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THE POWER TOOL  
THE USE OF THE POWER TOOL  
Transporting the Power Tool  
!Warning!  
For illustrations and definitions of the  
power tool parts see the chapter on  
“Main Parts and Controls.”  
Wear an approved safety  
hard hat to reduce the risk  
of injury to your head.  
Chainsaw noise may  
damage your hearing.  
Wear sound barriers (ear  
!Warning!  
To reduce the risk of injury from saw  
chain contact, never carry or transport  
your power tool with the saw chain  
moving. Always engage the chain brake  
when taking more than a few steps.  
!Warning!  
Never modify this power tool in any way.  
Only attachments supplied by STIHL or  
expressly approved by STIHL for use  
with the specific STIHL model are  
authorized. Although certain  
plugs or ear mufflers) to help protect  
your hearing. Continual and regular  
users should have their hearing checked  
regularly.  
!Warning!  
unauthorized attachments are useable  
with STIHL power tools, their use may, in  
fact, be extremely dangerous.  
Always switch off the engine, and fit the  
chain guard (scabbard) over the chain  
and guide bar before transporting the  
power tool over longer distances. When  
transporting it in a vehicle, properly  
secure it to prevent turnover, fuel  
Be particularly alert and cautious when  
wearing hearing protection because  
your ability to hear warnings (shouts,  
alarms, etc.) is restricted.  
If this tool is subjected to unusually high  
loads for which it was not designed (e.g.  
heavy impact or a fall), always check  
that it is in good condition before  
Never operate your power tool unless  
wearing goggles or properly fitted  
spillage and damage to the unit.  
protective glasses with adequate top  
and side protection complying with ANSI  
Z 87.1 (or your applicable national  
standard). To reduce the risk of injury to  
your face STIHL recommends that you  
also wear a face shield or face screen  
over your goggles or protective glasses.  
continuing work. Check in particular that  
the fuel system is tight (no leaks) and  
that the controls and safety devices are  
working properly. Do not continue  
operating this machine if it is damaged.  
In case of doubt, have it checked by your  
STIHL servicing dealer.  
Always wear gloves when  
handling the machine and  
the cutting tool. Heavy-  
duty, nonslip gloves  
improve your grip and  
help to protect your  
hands.  
It may be carried only in a horizontal  
position. Grip the front handle in a  
manner that the machine is balanced  
horizontally. Keep the hot muffler away  
from your body and the cutting  
attachment behind you.  
STIHL offers a wide range of protective  
clothing and equipment.  
MS 270, MS 270 C, MS 280, MS 280 C  
7
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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.  
Fold the grip flush with the  
top of the cap. If the grip  
does not lie completely  
flush with the cap and the  
detent on the grip does  
not fit in the  
Fuel  
Your STIHL power tool uses an oil-  
gasoline mixture for fuel (see the chap-  
ter on “Fuel” of your instruction manual).  
!Warning!  
!Warning!  
corresponding recess in the filler  
Gasoline is an extremely  
flammable fuel. If spilled  
and ignited by a spark or  
other ignition source, it  
can cause fire and serious  
opening, the cap is not properly seated  
and tightened and you must repeat the  
above steps.  
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.  
Screw cap  
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!  
Different models may be equipped with  
different fuel caps.  
Unit vibrations can cause an improperly  
tightened fuel filler cap to loosen or  
come off and spill quantities of fuel. In  
order to reduce the risk of fuel spillage  
and fire, tighten the fuel filler cap by  
hand as securely as possible.  
Cap with grip  
!Warning!  
The screwdriver end of  
the STIHL combination  
wrench or other similar  
tool can be used as an aid  
in tightening slotted fuel  
filler caps.  
In order to reduce the risk of fuel spillage  
and fire from an improperly tightened  
fuel cap, correctly position and tighten  
the fuel cap in the fuel tank opening.  
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.  
To do this with this STIHL  
cap, raise the grip on the  
top of the cap until it is  
upright at a 90° angle.  
Insert the cap in the fuel  
See "Fueling" chapter in your instruction  
manual.  
tank opening with the  
triangular marks on the grip of the cap  
and on the fuel tank opening lining up.  
Using the grip, turn the cap firmly  
clockwise as far as it will go (approx. a  
quarter turn).  
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.  
8
MS 270, MS 270 C, MS 280, MS 280 C  
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Before Starting  
Starting  
!Warning!  
Take off the chain guard (scabbard) and  
inspect the saw for proper condition and  
operation. (See the maintenance chart  
near the end of the instruction manual.)  
!Warning!  
Proper tension of the chain is extremely  
important. In order to avoid improper  
setting, the tensioning procedure must  
be followed as described in your  
manual. Always make sure the  
To reduce the risk of fire and burn  
injuries, start the engine at least 10 feet  
(3 meters) from the fueling spot,  
outdoors only.  
!Warning!  
hexagonal nut(s) for the sprocket cover  
is (are) tightened securely after  
tensioning the chain in order to secure  
the bar. Never start the saw with the  
sprocket cover loose. Check chain  
tension once more after having  
tightened the nut(s) and thereafter at  
regular intervals (whenever the saw is  
shut off). If the chain becomes loose  
while cutting, shut off the engine and  
then tighten. Never try to adjust the  
chain while the engine is running!  
Always check your power tool for proper  
condition and operation before starting,  
particularly the throttle trigger, throttle  
trigger interlock, stop switch and cutting  
tool. The throttle trigger must move  
freely and always spring back to the idle  
position. Never attempt to modify the  
controls or safety devices.  
Start and operate your saw without  
assistance. For specific starting  
instructions, see the appropriate section  
of the instruction manual. Proper starting  
methods reduce the risk of injury.  
!Warning!  
To reduce the risk of injury from chain  
contact and/or reactive forces, the chain  
brake must be engaged when starting  
the saw.  
!Warning!  
Never operate your power tool if it is  
damaged, improperly adjusted or  
maintained, or not completely or  
securely assembled.  
!Warning!  
Do not drop start. This method is very  
dangerous because you may lose  
control of the saw.  
Keep the handles clean and dry at all  
times; it is particularly important to keep  
them free of moisture, pitch, oil, fuel mix,  
grease or resin in order for you to  
maintain a firm grip and properly control  
your power tool.  
!Warning!  
Check that the spark plug boot is secure  
– a loose boot may cause arcing that  
could ignite combustible fumes and  
cause a fire.  
There are two recommended methods  
for starting your chainsaw.  
For proper assembly of the bar and  
chain follow the procedure described in  
the chapter "Mounting the Bar and  
Chain" of your instruction manual.  
STIHL Oilomatic chain, guide bar and  
sprocket must match each other in  
gauge and pitch. Before replacing any  
bar and chain, see the chapter entitled  
"Specifications" in the instruction  
manual and the section "Kickback" and  
the "ANSI B 175.1-2000 chainsaw  
kickback standard" below.  
MS 270, MS 270 C, MS 280, MS 280 C  
9
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!Warning!  
Be sure that the guide bar and chain are  
clear of you and all other obstructions  
and objects, including the ground. When  
the engine is started, the engine speed  
with the starting throttle lock engaged  
will be fast enough for the clutch to  
engage the sprocket and, if the chain  
brake is not activated, turn the chain. If  
the upper quadrant of the tip of the bar  
touches any object, it may cause kick-  
back to occur (see section on reactive  
forces). To reduce this risk, always  
engage the chain brake before starting.  
Never attempt to start the chainsaw  
when the guide bar is in a cut or kerf.  
With the first recommended method,  
the chainsaw is started on the ground.  
Make sure the chain brake is engaged  
(see "Chain Brake" chapter in your  
instruction manual) and place the  
chainsaw on firm ground or other solid  
surface in an open area. Maintain good  
balance and secure footing.  
The second recommended method for  
starting your chainsaw allows you to  
start the saw without placing it on the  
ground. Make sure the chain brake is  
engaged, grip the front handle of the  
chainsaw firmly with your left hand.  
Keep your arm on the front handle in a  
locked (straight) position. Hold the rear  
handle of the saw tightly between your  
legs just above the knees. Maintain  
good balance and secure footing. Pull  
the starting grip slowly with your right  
hand until you feel a definite resistance  
and then give it a brisk, strong pull.  
As soon as the engine is running,  
immediately blip the throttle trigger,  
which will disengage the starting throttle  
lock and allow the engine to settle down  
to idle.  
Grip the front handlebar of the saw firmly  
with your left hand and press down. For  
saws with a rear handle level with the  
ground, put the toe of your right foot into  
the rear handle and press down. With  
your right hand pull out the starter grip  
slowly until you feel a definite resistance  
and then give it a brisk, strong pull.  
!Warning!  
When you pull the starter grip, do not  
wrap the starter rope around your hand.  
Do not let the grip snap back, but guide  
the starter rope to rewind it properly.  
Failure to follow this procedure may  
result in injury to your hand or fingers  
and may damage the starter  
mechanism.  
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Your right hand should grip the rear  
handle. This also applies to left-handers.  
With your hands in this position, you can  
best oppose and absorb the push, pull  
and kickback forces of your saw without  
losing control (see section on reactive  
forces).  
Important Adjustments  
!Warning!  
!Warning!  
Keep proper footing and balance at all  
times. Special care must be taken in  
slippery conditions (wet ground, snow)  
and in difficult, overgrown terrain. Watch  
for hidden obstacles such as tree  
stumps, roots, rocks, holes and ditches  
to avoid stumbling. There is increased  
danger of slipping on freshly debarked  
logs. For better footing, clear away fallen  
branches, scrub and cuttings. Be  
To reduce the risk of personal injury from  
loss of control and/or contact with the  
running cutting tool, do not use your unit  
with incorrect idle adjustment. At correct  
idle speed, the cutting tool should not  
move. For directions on how to adjust  
idle speed, see the appropriate section  
of your instruction manual.  
!Warning!  
To reduce the risk  
of serious or fatal  
injury to the  
operator or  
bystanders from  
If you cannot set the correct idle speed,  
have your STIHL dealer check your  
power tool and make proper  
extremely cautious when working on  
slopes or uneven ground.  
loss of control, never use the saw with  
one hand. It is more difficult for you to  
control reactive forces and to prevent  
the bar and chain from skating or  
bouncing along the limb or log. Even for  
those compact saws designed for use in  
confined spaces, one-handed operation  
is dangerous because the operator may  
lose control.  
adjustments and repairs.  
!Warning!  
Take extreme care in wet and freezing  
weather (rain, snow, ice). Put off the  
work when the weather is windy, stormy  
or rainfall is heavy.  
During Operation  
Holding and controlling the power  
tool  
Always hold the unit firmly with both  
hands on the handles while you are  
working. Wrap your fingers and thumbs  
around the handles.  
!Warning!  
To reduce the risk of cut injuries, keep  
hands and feet away from the cutting  
tool. Never touch a moving cutting tool  
with your hand or any other part of your  
body.  
MS 270, MS 270 C, MS 280, MS 280 C  
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!Warning!  
Even though bystanders should be kept  
away from the running saw, never work  
alone. Keep within calling distance of  
others in case help is needed.  
!Warning!  
As soon as the engine is  
running, this product  
Position the chainsaw in such a way that  
your body is clear of the cutting  
attachment whenever the engine is  
running. Stand to the left of cut while  
bucking.  
generates toxic exhaust  
fumes containing  
chemicals, such as  
unburned hydrocarbons  
(including benzene) and carbon  
monoxide, that are known to cause  
respiratory problems, cancer, birth  
defects, or other reproductive harm.  
Some of the gases (e.g. carbon  
monoxide) may be colorless and  
odorless. To reduce the risk of serious or  
fatal injury/illness from inhaling toxic  
fumes, never run the machine indoors or  
in poorly ventilated locations. If exhaust  
fumes become concentrated due to  
insufficient ventilation, clear  
Never put pressure on the saw when  
reaching the end of a cut. The pressure  
may cause the bar and rotating chain to  
pop out of the cut or kerf, go out of  
control and strike the operator or some  
other object. If the rotating chain strikes  
some other object, a reactive force may  
cause the moving chain to strike the  
operator.  
!Warning!  
To reduce the risk of injury from loss of  
control, never work on a ladder or any  
other insecure support. Never hold the  
machine above shoulder height. Do not  
overreach.  
obstructions from work area to permit  
proper ventilation before proceeding  
and/or take frequent breaks to allow  
fumes to dissipate before they become  
concentrated.  
Working conditions  
!Warning!  
Operate and start your power tool only  
outdoors in a well ventilated area.  
Operate it under good visibility and  
daylight conditions only. Work carefully.  
Never work in a tree unless you have  
received specific, professional training  
for such work, are properly secured  
(such as tackle and harness system or a  
lift bucket), have both hands free for  
operating the chainsaw in a cramped  
environment and have taken proper  
precautions to avoid injury from falling  
limbs or branches.  
!Warning!  
Your chainsaw is a one-person machine.  
Do not allow other persons in the  
general work area, even when starting.  
Stop the engine immediately if you are  
approached.  
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!Warning!  
!Warning!  
!Warning!  
The saw chain continues to move for a  
short period after the throttle trigger is  
released (flywheel effect).  
Inhalation of certain dusts, especially  
organic dusts such as mold or pollen,  
can cause susceptible persons to have  
an allergic or asthmatic reaction.  
Substantial or repeated inhalation of  
dust and other airborne contaminants, in  
particular those with a smaller particle  
size, may cause respiratory or other  
illnesses. This includes wood dust,  
especially from hardwoods, but also  
from some softwoods such as Western  
Red Cedar. Control dust at the source  
where possible. Use good work  
Breathing asbestos dust is dangerous  
and can cause severe or fatal injury,  
respiratory illness or cancer. The use  
and disposal of asbestos-containing  
products have been strictly regulated by  
OSHA and the Environmental Protection  
Agency. If you have any reason to  
believe that you might be cutting  
asbestos, immediately contact your  
employer or a local OSHA  
Accelerating the engine while the saw  
chain is blocked increases the load and  
will cause the clutch to slip continuously.  
This may occur if the throttle is  
depressed for more than a few seconds  
when the chain is pinched in the cut or  
the chain brake is engaged. It can result  
in overheating and damage to important  
components (e.g. clutch, polymer  
housing components) – which can then  
increase the risk of injury, e.g., from the  
saw chain moving while the engine is  
idling.  
representative.  
practices, such as always cutting with a  
properly sharpened chain (which  
produces wood chips rather than fine  
dust) and operating the unit so that the  
wind or operating process directs any  
dust raised by the power tool away from  
the operator. Follow the  
recommendations of EPA/OSHA/  
NIOSH and occupational and trade  
associations with respect to dust  
(“particulate matter”). When the  
Operating instructions  
!Warning!  
Do not operate your power tool using the  
starting throttle lock, as you do not have  
control of the engine speed.  
! Warning!  
Your chainsaw is equipped with a chain  
catcher. It is designed to reduce the risk  
of personal injury in the event of a  
thrown or broken chain. From time to  
time, the catcher may be damaged or  
removed. To reduce the risk of personal  
injury, do not operate a chainsaw with a  
damaged or missing chain catcher.  
In the event of an emergency, switch off  
the engine immediately – move the slide  
control / stop switch to 0 or STOP.  
!Warning!  
Always stop the engine before putting a  
chainsaw down.  
inhalation of dust cannot be substantially  
controlled, i.e., kept at or near the  
ambient (background) level, the  
operator and any bystanders should  
wear a respirator approved by NIOSH/  
MSHA for the type of dust encountered.  
MS 270, MS 270 C, MS 280, MS 280 C  
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! Warning!  
!Warning!  
!Warning!  
Inspect buffers periodically. Replace  
damaged, broken or excessively worn  
buffers immediately, since they may  
result in loss of control of the saw. A  
"sponginess" in the feel of the saw,  
increased vibration or increased  
"bottoming" during normal operation  
may indicate damage, breakage or  
excessive wear. Buffers should always  
be replaced in sets. If you have any  
questions as to whether the buffers  
should be replaced, consult your STIHL  
servicing dealer.  
To reduce the risk of fire and burn injury,  
keep the area around the muffler clean.  
Remove excess lubricant and all debris  
such as pine needles, branches or  
Since a muffler with a catalytic converter  
cools down less rapidly than conven-  
tional mufflers, always set your power  
tool down in the upright position and  
never locate it where the muffler is near  
dry brush, grass, wood chips or other  
combustible materials while it is still hot.  
leaves. Let the engine cool down sitting  
on concrete, metal, bare ground or solid  
wood (e.g. the trunk of a felled tree)  
away from any combustible substances.  
!Warning!  
!Warning!  
An improperly mounted or damaged  
shroud or a damaged/deformed muffler  
shell may interfere with the cooling  
process of the catalytic converter. To  
reduce the risk of fire or burn injury, do  
not continue work with a damaged or  
improperly mounted cylinder shroud or a  
damaged/deformed muffler shell.  
Never modify your muffler. A modified or  
damaged muffler could cause an  
increase in heat radiation or sparks,  
thereby increasing the risk of fire and  
burn injury. You may also permanently  
damage the engine. Have your muffler  
serviced and repaired by your STIHL  
servicing dealer only.  
!Warning!  
Your saw is not designed for prying or  
shoveling away limbs, roots or other  
objects. Such use could damage the  
cutting attachment or AV system.  
Your catalytic converter is furnished with  
screens designed to reduce the risk of  
fire from the emission of hot particles.  
Due to the heat from the catalytic  
reaction, these screens will normally  
stay clean and need no service or  
maintenance. If you experience loss of  
performance and you suspect a clogged  
screen, have your muffler maintained by  
a STIHL servicing dealer.  
Catalytic converter  
!Warning!  
When sawing, make sure that the saw  
chain does not touch any foreign  
materials such as rocks, fences, nails  
and the like. Such objects may be flung  
off, damage the saw chain or cause the  
saw to kickback.  
!Warning!  
Some STIHL power tools  
are equipped with a  
catalytic converter, which  
is designed to reduce the  
exhaust emissions of the  
engine by a chemical  
!Warning!  
process in the muffler. Due to this  
process, the muffler does not cool down  
as rapidly as conventional mufflers when  
the engine returns to idle or is shut off.  
To reduce the risk of fire and burn  
injuries, the following specific safety  
precautions must be observed.  
The muffler and other parts of the engine  
(e.g. fins of the cylinder, spark plug)  
become hot during operation and remain  
hot for a while after stopping the engine.  
To reduce risk of burns do not touch the  
muffler and other parts while they are  
hot.  
14  
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Reactive forces including kickback  
Kickback:  
Kickback may occur, for example,  
when the chain near the upper quadrant  
of the bar nose contacts the wood or is  
pinched during limbing or when it is  
incorrectly used to begin a plunge or  
boring cut.  
Kickback may occur when  
the moving saw chain  
near the upper quadrant  
of the bar nose contacts a  
solid object or is pinched.  
!Warning!  
Reactive forces may occur any time the  
chain is rotating. Reactive forces can  
cause serious personal injury.  
The greater the force of the kickback  
reaction, the more difficult it becomes for  
the operator to control the saw. Many  
factors influence the occurrence and  
force of the kickback reaction. These  
include chain speed, the speed at which  
the bar and chain contact the object, the  
angle of contact, the condition of the  
chain and other factors.  
The type of bar and saw chain you use  
is an important factor in the occurrence  
and force of the kickback reaction. Some  
STIHL bar and chain types are designed  
to reduce kickback forces. STIHL  
The powerful force used to cut wood can  
be reversed and work against the  
operator. If the rotating chain is suddenly  
stopped by contact with any solid object  
such as a log or branch or is pinched, the  
reactive forces may occur instantly.  
These reactive forces may result in loss  
of control, which, in turn, may cause  
serious or fatal injury. An understanding  
of the causes of these reactive forces  
may help you avoid the element of  
surprise and loss of control. Sudden  
surprise contributes to accidents.  
recommends the use of reduced  
kickback bars and low kickback chains.  
ANSI B 175.1-2000 chainsaw  
kickback standard  
The reaction of the cutting force of the  
chain causes a rotational force on the  
chainsaw in the direction opposite to the  
chain movement. This may fling the bar  
up and back in a ligtening fast reaction in  
an uncontrolled arc mainly in the plane  
of the bar. Under some cutting  
circumstances the bar moves towards  
the operator, who may suffer severe or  
fatal injury.  
Section 5.11 of ANSI standard  
B 175.1-2000, sets certain performance  
and design criteria related to chainsaw  
kickback.  
The most common reactive forces are:  
To comply with section 5.11 of ANSI  
B 175.1-2000:  
kickback,  
pushback,  
pull-in.  
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a) Saws with a displacement of less  
than 3.8 cubic inches (62 cm³)  
In addition, features designed to reduce  
kickback injuries may lose some of their  
effectiveness when they are no longer in  
their original condition, especially if they  
have been improperly maintained.  
Compliance with § 5.11 of ANSI B 175.1-  
2000 does not automatically mean that  
in a real life kickback the bar and chain  
will rotate at most 45°.  
Devices for reducing the risk of  
kickback injury  
must, in their original condition,  
meet a 45° computer derived  
kickback angle when equipped with  
certain cutting attachments,  
STIHL recommends the use of the  
STIHL Quickstop chain brake on your  
powerhead with green labeled reduced  
kickback bars and low kickback chains.  
and must be equipped with at least  
two devices to reduce the risk of  
kickback injury, such as a chain  
brake, low kickback chain, reduced  
kickback bar, etc.  
!Warning!  
To reduce the risk of injury, never use a  
saw if the chain brake does not function  
properly. Take the saw to your local  
STIHL servicing dealer. Do not use the  
saw until the problem has been rectified.  
!Warning!  
In order for powerheads below 3.8 cubic  
inch (62 cm³) displacement to comply  
with the computed kickback angle  
requirements of § 5.11 of ANSI B 175.1-  
2000 use only the following cutting  
attachments:  
b) Saws with a displacement of  
3.8 cubic inches (62 cm³) and above  
must be equipped with at least one  
device designed to reduce the risk  
of kickback injury, such as a chain  
brake, low kickback chain, reduced  
kickback bar, etc.  
STIHL Quickstop chain brake  
STIHL has developed a chain stopping  
system designed to reduce the risk of  
injury in certain kickback situations. It is  
called a Quickstop chain brake. The  
Quickstop chain brake is standard  
equipment on your STIHL chainsaw.  
bar and chain combinations listed  
as complying in the "Specifications"  
section of the instruction manual or  
other replacement bar and chain  
combinations marked in  
The computer derived angles for saws  
below 3.8 cubic inch (62 cm³)  
displacement are measured by applying  
a computer program to test results from  
a kickback test machine.  
accordance with the standard for  
use on the powerhead or  
replacement chain designated  
"low kickback saw chain.“  
!Warning!  
See the section on "Low kickback saw  
chain and reduced kickback bars."  
The computer derived angles of § 5.11  
of ANSI B 175.1-2000 may bear no  
relationship to actual kickback bar  
rotation angles that may occur in real life  
cutting situations.  
16  
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!Warning!  
!Warning!  
Never operate your chainsaw without a  
front hand guard. In a kickback situation  
this guard helps protect your left hand  
and other parts of your body. In addition,  
removal of the hand guard on a saw  
equipped with a Quickstop chain brake  
will deactivate the chain brake.  
An improperly maintained chain brake  
may increase the time needed to stop  
the chain after activation, or may not  
activate at all.  
!Warning!  
Never run the chainsaw above idle  
speed for more than 3 seconds when the  
chain brake is engaged or when the  
chain is pinched or otherwise caught in  
the cut. Clutch slippage can cause  
excessive heat, leading to severe  
damage of the motor housing, clutch  
and oiler component and may interfere  
with the operation of the chain brake. If  
clutch slippage in excess of 3 seconds  
has occurred, allow the motor housing to  
cool before proceeding and check the  
operation of your chain brake as  
!Warning!  
No Quickstop or other chain brake  
device prevents kickback. These  
devices are designed to reduce the risk  
of kickback injury, if activated, in certain  
kickback situations. In order for the  
Quickstop to reduce the risk of kickback  
injury, it must be properly maintained  
and in good working order. See the  
chapter of your instruction manual  
entitled "Chain Brake" and the section  
"Maintenance, Repair and Storing" at  
the end of these Safety Precautions. In  
addition, there must be enough distance  
between the bar and the operator to  
ensure that the Quickstop has sufficient  
time to activate and stop the chain  
before potential contact with the  
operator.  
When a kickback occurs, the guide bar  
may rotate around the front handle. If the  
cutting position is such that the  
described in the chapter entitled "Chain  
Brake" of your instruction manual. Also  
make sure that the chain is not turning at  
idle speed (see above at "Important  
Adjustments").  
operator's left hand is gripping the front  
handle behind the hand guard, and if the  
left hand rotates around the front handle  
and makes a sufficiently forceful contact  
with the front hand guard, which is the  
Quickstop activating lever, this contact  
will activate a properly maintained  
Quickstop chain brake. The chain brake  
on newer STIHL chainsaws can also be  
activated by inertia. If the kickback  
forces are sufficiently high, the hand  
guard is accelerated towards the bar  
nose even without hand contact. See the  
chapter entitled "Chain Brake" of your  
instruction manual.  
MS 270, MS 270 C, MS 280, MS 280 C  
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Low kickback saw chain and reduced  
kickback bars  
Please ask your STIHL dealer to  
properly match your powerhead with the  
appropriate bar/chain combination to  
reduce the risk of kickback injury. Green  
labeled bars and chains are  
Low kickback chain  
Some types of saw chain have specially  
designed components to reduce the  
force of nose contact kickback. STIHL  
has developed low kickback chain for  
your powerhead.  
STIHL offers a variety of bars and  
chains. STIHL reduced kickback bars  
and low kickback chains are designed to  
reduce the risk of kickback injury. Other  
chains are designed to obtain higher  
cutting efficiency or sharpening ease but  
may result in higher kickback tendency.  
recommended for all powerheads.  
Warning!  
"Low kickback saw chain" is a chain  
which has met the kickback  
Use of other, non-listed bar/chain  
combinations may increase kickback  
forces and the risk of kickback injury.  
New bar/chain combinations may be  
developed after publication of this  
literature, which will, in combination with  
certain powerheads, comply with  
§ 5.11 of ANSI B 175.1-2000. Check  
with your STIHL dealer for such  
combinations.  
performance requirements of § 5.11.2.4  
of ANSI B 175.1-2000 (Gasoline-  
Powered Chain Saws–Safety  
Requirements) when tested in its  
original condition on a selected  
representative sample of chainsaws  
below 3.8 cubic inch (62 cm³)  
displacement specified in  
STIHL has developed a color code  
system to help you identify the STIHL  
reduced kickback bars and low kickback  
chains. Cutting attachments with green  
warning decals or green labels on the  
packaging are designed to reduce the  
risk of kickback injury. The matching of  
green decaled powerheads under 3.8  
cubic inch (62 cm³) displacement with  
green labeled bars and green labeled  
chains gives compliance with the  
ANSI B 175.1-2000.  
!Warning!  
Reduced kickback bars and low  
kickback chains do not prevent  
kickback, but they are designed to  
reduce the risk of kickback injury. They  
are available from your STIHL dealer.  
!Warning!  
There are potential powerhead and bar  
combinations with which low kickback  
saw chains can be used which have not  
been specifically certified to comply with  
the 45° computer derived kickback  
angle of § 5.11 of ANSI B 175.1-2000.  
Some low kickback chains have not  
been tested with all powerhead and bar  
combinations.  
computed kickback angle requirements  
of ANSI B 175.1-2000 when the  
products are in their original condition.  
Products with yellow decals or labels are  
for users with extraordinary cutting  
needs and experience and specialized  
training for dealing with kickback.  
!Warning!  
Even if your saw is equipped with a  
Quickstop, a reduced kickback bar and/  
or low kickback chain, this does not  
eliminate the risk of injury by kickback.  
Therefore, always observe all safety  
precautions to avoid kickback situations.  
STIHL recommends the use of its  
green labeled reduced kickback bars,  
green labeled low kickback chains  
and a STIHL Quickstop chain brake  
for both experienced and  
!Warning!  
A dull or improperly sharpened chain  
may reduce or negate the effects of the  
design features intended to reduce  
kickback energy. Improper lowering or  
sharpening of the depth gauges or  
shaping of the cutters may increase the  
chance and the potential energy of a  
kickback. Always cut with a properly  
sharpened chain.  
inexperienced chainsaw users.  
18  
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Reduced kickback bars  
To avoid kickback  
A = Pull-in  
STIHL green labeled reduced kickback  
bars are designed to reduce the risk of  
kickback injury when used with STIHL  
green labeled low kickback chains.  
The best protection from personal injury  
that may result from kickback is to avoid  
kickback situations:  
1. Hold the chainsaw firmly with both  
hands and maintain a secure grip.  
Don’t let go.  
!Warning!  
When used with other, more aggressive  
chains, these bars may be less effective  
in reducing kickback.  
2. Be aware of the location of the guide  
bar nose at all times.  
A
3. Never let the nose of the guide bar  
contact any object. Do not cut limbs  
with the nose of the guide bar. Be  
especially careful near wire fences  
and when cutting small, tough  
Pull-in occurs when the chain on the  
bottom of the bar is suddenly stopped  
when it is pinched, caught or encounters  
a foreign object in the wood. The  
reaction of the chain pulls the saw  
forward and may cause the operator to  
lose control.  
Bow Guides  
!Warning!  
Do not mount a bow guide on any STIHL  
chainsaw. Any chainsaw equipped with  
a bow guide is potentially very  
limbs, small size brush and saplings  
which may easily catch the chain.  
4
Don't overreach.  
dangerous. The risk of kickback is  
increased with a bow guide because of  
the increased kickback contact area.  
Low kickback chain will not significantly  
reduce the risk of kickback injury when  
used on a bow guide.  
Pull-in frequently occurs when the  
bumper spike of the saw is not held  
securely against the tree or limb and  
when the chain is not rotating at full  
speed before it contacts the wood.  
5. Don't cut above shoulder height.  
6. Begin cutting and continue at full  
throttle.  
7. Cut only one log at a time.  
8. Use extreme caution when  
reentering a previous cut.  
!Warning!  
Use extreme caution when cutting small  
size brush and saplings which may  
easily catch the chain, be whipped  
towards you or pull you off balance.  
9. Do not attempt to plunge cut if you  
are not experienced with these  
cutting techniques.  
10. Be alert for shifting of the log or  
other forces