Dolmar PS-34 Instruction Manual

1
PS-34
Owner’s and Safety Manual
for Gasoline Chain Saws (page 2 - 34)
Manuel d’emploi et de sécurité
de tronçonneuses thermiques (page 35 - 67)
WARNING!
Read and understand this Manual. Always follow safety precautions in the Owner’s and Safety Manual.
Improper use can cause serious injury!
The engine exhaust from this product contains chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm. Preserve this Manual carefully!
ATTENTION!
Suivez toujours les conseils de sécurité du présent manuel d’emploi et de sécurité. Une utilisation
incorrecte de la tronçonneuse peut entraîner des blessures graves! Conservez avec soin ce manuel!
Les gaz d’échappement émis par ce produit contiennent des produits chimiques connus par l’Etat de
Californie pour provoquer le cancer, des défauts de naissance ou autres dommages de reproduction.
Lisez et comprenez ce manuel.

2
EMISSIONS COMPONENT DEFECT WARRANTY COVERAGE
DOLMAR warrant to the initial retail purchaser and each subsequent owner, that this utility equipment was designed, built, and
equipped to conform at the time of initial sale to all applicable regulations of the U.S. Environmental Protection Agency (EPA), and
that the engine is free of defects in materials and workmanship which would cause this engine to fail to conform with EPA regulations
during its warranty period.
For the components listed under PARTS COVERED, the service dealer authorized by DOLMAR will, at no cost to you, make the
necessary diagnosis, repair, or replacement necessary to ensure that the engine complies with applicable U.S. EPA regulations.
EMISSION COMPONENT DEFECT WARRANTY PERIOD
The warranty period for this engine begins on the date of sale to the initial purchaser and continues for a period of 2 years.
PARTS COVERED
Listed below are the parts covered by the Emission Components Defect Warranty. Some of the parts listed below may require sche-
duled maintenance and are warranted up to the rst scheduled replacement point for that part.
Fuel Metering System Ignition System
Carburetor and internal parts Spark plug
Fuel lter, if applicable Flywheel Magneto
Throttle stopper, if applicable Ignition Coil
Choke System, if applicable
Air Induction System Miscellaneous Items Used in Above Systems
Pre lter, if exist Fuel hoses, clamps and sealing gaskets
Air lter, Air lter case, Intake manifold
OBTAINING WARRANTY SERVICE
To obtain warranty service, take your engine to the nearest DOLMAR service Center authorized by DOLMAR. Bring your sales re-
ceipts indicating date of purchase for this engine. The dealer of service authorized by DOLMAR will perform the necessary repairs or
adjustments within a reasonable amount of time and furnish you with a copy of the repair order. All parts and accessories replaced
under this warranty become the property of DOLMAR.
WHAT IS NOT COVERED
• Conditions resulting from tampering, misuse, improper adjustment (unless they were made by the service dealer authorized by
DOLMAR during a warranty repair), alteration, accident, failure to use the recommended fuel and oil, or not performing required
maintenance services.
• The replacement parts used for required maintenance services.
• Consequential damages such as loss of time, inconvenience, loss of use of the engine or equipment, etc.
• Diagnosis and inspection charges that do not result in warranty-eligible service being performed.
• Any non-authorized replacement part, or malfunction of authorized parts due to use of non-authorized parts.
OWNER’S WARRANTY RESPONSIBILITIES
As the engine owner, you are responsible for the performance of the required maintenance listed in your owner’s manual.
DOLMAR recommends that you retain all receipts covering maintenance on your engine, but DOLMAR cannot deny warranty solely
for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance. As the engine owner, you should
however be aware that DOLMAR may deny warranty coverage if your engine or a part has failed due to abuse, neglect, improper
maintenance or unapproved modications.
You are responsible for presenting your engine to the nearest service dealer authorized by DOLMAR when a problem exists.
If you have any questions regarding your warranty rights and responsibilities, you should contact the DOLMAR Warranty service
Department at 1-888-OPE-PART for the information.
THINGS YOU SHOULD KNOW ABOUT THE EMISSION CONTROL SYSTEM WARRANTY:
MAINTENANCE AND REPAIRS
You are responsible for the proper maintenance of the engine. You should keep all receipts and maintenance records covering the
performance of regular maintenance in the event questions arise. These receipts and maintenance records should be transferred to
each subsequent owner of the engine. DOLMAR reserves the right to deny warranty coverage if the engine has not been properly
maintained. Warranty claims will not be denied, however, solely because of the lack of required maintenance or failure to keep
maintenance records.
MAINTENANCE, REPLACEMENT OR REPAIR OF EMISSION CONTROL DEVICES AND SYSTEMS MAY BE PERFORMED BY
ANY REPAIR ESTABLISHMENT OR INDIVIDUAL; HOWEVER, WARRANTY REPAIRS MUST BE PERFORMED BY A SERVICE
DEALER AUTHORIZED BY DOLMAR. THE USE OF PARTS THAT ARE NOT EQUIVALENT IN PERFORMANCE AND DURABILI-
TY TO AUTHORIZED PARTS MAY IMPAIR THE EFFECTIVENESS OF THE EMISSION CONTROL SYSTEM AND MAY HAVE A
BEARING ON THE OUTCOME OF A WARRANTY CLAIM.
If other than the parts authorized by DOLMAR are used for maintenance replacements or for the repair of components affecting emis-
sion control, you should assure yourself that such parts are warranted by their manufacturer to be equivalent to the parts authorized
by DOLMAR in their performance and durability.
HOW TO MAKE A CLAIM
All repair qualifying under this limited warranty must be performed by a service dealer authorized by DOLMAR. In the event that any
emission-related part is found to be defective during the warranty period, you shall notify DOLMAR Warranty service Department at
1-888-OPE-PART and you will be advised of the appropriate warranty service dealer or service providers
where the warranty repair can be performed.

3
The DOLMAR PS-34 will be delivered in a protective cardboard box to prevent transport damage. Cardboard is a
basic raw material and is consequently reuseable or suitable for recycling (waste paper recycling).
This product complies with: American National Standard Institute B 175.1-1991 chain saw safety standard.
Canadian Standards Association Z62.1-95 chain saw safety standard.
Z62.3-96 chain saw kickback standard.
Society of Automotive Engineers SAEJ 335-Jun 95 „Multiposition small
engine exhaust system re ignition
suppression”
The Emissions Compliance Period referred to on the emission Compliance label indicates the number of operat-
ing hours for which the engine has been shown to meet federal emissions requirements. Category C= 50 hours,
B= 125 hours, and A= 300 hours.
With the purchase of this chain saw you have chosen a German quality product. Important instructions for the
assembly and operation of this saw are given in this manual. For your own safety, we ask you to read the acci-
dent prevention instructions very carefully before putting your chain saw into operation, as incorrect handling can,
despite all precautions, lead to accidents. With a little care and attention you will have good service and lasting
satisfaction from this rst-rate product. The following industrial property rights apply: DE 19722629.
RE Y
WARNING !
Careless or improper use of this product can cause serious or even fatal injury.
Before operating a chain saw or other DOLMAR products it is important that you read, fully understand and
carefully follow the instructions outlined in this owners manual. Kickback may cause severe or fatal injury and
is one of many potential dangers in operating a chain saw. Kickback and other safety related precautions are
described in detail within this owners manual. Additional owners manuals are available from DOLMAR POWER
PRODUCTS, PO Box 5007, Alpharetta, GA, 30005-5007, USA, Telephone 1-888-OPE-PART.
Contents Page
Delivery inventory 4
Symbols 4
Safety precautions 5-16
Denomination of components 17
Technical data 18
Approved bar and chain combinations 18
Mounting the guide bar and saw chain 19-20
Checking the chain tension 21
Safety chain brake 21
Fuel / Refuelling 22-23
Checking the chain lubrication 24
Starting the engine 25
Stopping the engine 25
Checking the safety chain brake 26
DOLMAR PS-34
Contents Page
Set idle speed 26
Sharpening the saw chain 27-28
Cleaning the brake band and sprocket 29
Cleaning the guide bar 29
Replacing the saw chain 30
Replacing the fuel lter 30
Cleaning the air lter 30
Replacing the spark plug 31
Replacing / cleaning the spark arrester screen 31
Instructions for periodic maintenance 32
Service, spare parts and guarantee 32-33
Troubleshooting 33
Extract from the spare parts list 34

4
Delivery inventory
In case one of the parts listed should not be included in the
delivery inventory, please consult your sales agent.
1. Chain saw
2. Guide bar
3. Saw chain
4. Chain protection cover
5. Assembly tool
6. Owner’s and Safety Manual (not shown)
Symbols
You will notice the following symbols on the chain saw and in the Owner’s and Safety Manual:
Further
symbols
see page 7.
RE Y
Read Owner’s and Safety Manual
and follow the warning-
and safety precautions!
Particular care
and caution!
Forbidden!
Wear protective helmet,
eye and ear protection!
Wear protective gloves!
No smoking!
No open re!
Combination Start/Stop (I/O)
switch, choke
Direction of chain travel
Stop engine!
Start the engine
Caution, kickback!
Chaine brake
Fuel and oil mixture
Chain oil ll
First aid
Recycling
1
4
5
32

5
Safety precautions for chain saw operators
While operating the chain saw please observe the
following rules:
a) Contact of the guide bar nose with any object
should be avoided.
b) Tip contact may cause the guide bar to move
suddenly upward and backward, which may
cause serious or fatal injury.
c) Always operate the chain saw with both hands.
WARNING!
Read andfollowallsafetyprecautionsintheowner’s
manual. Failure to follow instructions could result in
serious injury. It is recommended to lend the chain
saw only to people who are experienced in working
with chain saws.Always hand over the Owner‘s and
Safety Manual.
WARNING!
This chain saw is capable of severe kickback that
could result in serious injury to the operator. Do not
operate this chain saw unless you have extraordinary
cutting needs and experience in and special training
for dealing with kickback. Chain saws with signicant-
ly reduced kickback potential are available.
WARNING!
Kickbackmayoccurwhenthenoseortipoftheguide
bar touches an object, or when the wood closes in
and pinches the saw chain in the cut. This contact
may abruptly stop the sawchainand insome cases
may cause a lightning fast reverse reaction, kicking
the guide bar up and back towards the user, or push
the guide bar back towards the operator. Kickback
may cause you to lose control of the saw.
As a chain saw user, you can take several steps to
reduce the risk of a kickback and potential injury.
A. With a basic understanding of kickback, you
can reduce or eliminate the element of surpri-
se. It is a sudden surprise that contributes to
accidents.
B. Keep a good rm grip on the saw with both
hands, your right hand on the rear grip and
your left hand on the tubular handle, when the
engine is running. Use a rm grip with thumbs
and ngers encircling the chain saw handles. A
rm grip can neutralize kickback and help you
maintain control of the saw. Don’t let go!
C. Make sure that the area in which you are cutting
is free from obstructions. Do not let the nose
of the guide bar contact the log, branch, or any
other obstructions which could be hit while you
are operating the saw.
D. Do not overreach or cut above shoulder
height.
E. Followmanufacturer’ssharpeningandmainten-
ance instructions for the saw chain.
F. Only use replacement bars and chains specied
by the manufacturer or the equivalent.
Additional safety precautions
The following additional safety precautions should be
observed by all users of chain saws:
1. Do not operate a chain saw when you are fati-
gued.
2. Use safety footwear; snug-tting clothing; protec-
tive gloves; and eye, hearing, and head protection
devices.
3. Usecautionwhenhandlingfuel.Movethechainsaw
at least 10 feet (3 m) from the fueling point before
starting the engine.
4. Do not allow other persons to be near the chain saw
when starting or cutting with the chain saw. Keep
bystanders and animals out of the work area.
5. Do not start cutting until you have a clear work
area, secure footing, and a planned retreat path
from the falling tree.
6. Keep all parts of your body away from the saw chain
when the engine is running.
7. Before you start the engine, make sure that the saw
chain is not contacting anything.
8. Carry the chain saw with the engine stopped, the
guide bar and saw chain to the rear, and the mufer
away from your body.
9. Do not operate a chain saw that is damaged, is im-
properly adjusted, or is not completely and securely
assembled.Besurethatthesawchainstopsmoving
when the throttle control trigger is released.
10. Shut off the engine before setting it down.
11. Use extreme caution when cutting small size brush
and saplings because slender material may catch
the saw chain and be whipped toward you or
pull you off balance.
12. When cutting a limb that is under tension be alert
for springback so that you will not be struck when
the tension on the wood bers is released.
13. Keep the handles dry, clean, and free of oil or fuel
mixture.
14. Operate the chain saw only in well-ventilated
areas.
15. Do not operate a chain saw in a tree unless you
have been specically trained to do so.
16. All chain saw service, other than the items listed
in the owner’s manual maintenance instructions,
should be performed by DOLMAR . (For example,
if improper tools are used to remove the ywheel
or if an improper tool is used to hold the ywheel
in order to remove the clutch structural damage to
the ywheel could occur and could subsequently
cause the ywheel to burst.)
17. When transporting your chain saw, use the chain
protection cover.
18. Low kickback bars and low kickback chains are
designed to reduce the risk of kickback injury. Ask
your DOLMAR dealer about these devices.

6
General Safety Precautions
The use of any chain saw may be hazardous. At full
throttle chain speed can reach 45 mph (20 m/s). It is
important that you read; fully understand and observe
the following safety precautions and warnings. Read
the owner’s manual and the safety instructions peri-
odically.
WARNING !
Reactive forces, including kickback, can be dan-
gerous. Careless or improper use of any chain saw
may cause serious or fatal injury.
Have your DOLMAR dealer show you how to ope-
rate your chain saw. Observe all applicable local
safety regulations, standards and ordinances.
1
WARNING!
Minors should never be allowed to use a chain saw.
Bystanders,especiallychildrenandanimalsshouldnotbe
allowed in the area where a chain saw is in use (g. 1).
Never let the saw run unattended.
Store it in a locked place away from children. Fill the fuel
tank to 7/8 th full (see storing the saw).
Donotlend yourchainsawwithoutthisowner’smanual.
Be sure that anyone using your saw un-derstands the
information given.
Proper use of a chain saw involves
1. the operator
2. the saw
3. the use of the saw. WARNING !
Prolonged use of chain saws exposing the operator
to vibrations may produce Whitenger disease (Ray-
naud’s phenomenon). This phenomenon reduces
the hand’s ability to feel and regulate temperature,
produces numbness and burning sensations and
may cause nerve and circulation damage and
tissue necrosis.
All DOLMAR saws are therefore provided with an
antivibration system which is essential for those
using chain saws on a regular or sustained basis.
Antivibration systems do not guarantee that you
will not sustain Whitenger disesase, however, they
reduce this danger considerably. Nevertheless,
continual and regular users should observe their
hands and ngers and in case of any abnormal
symptoms, seek medical advice immediately.
2
The operator
Physical Condition
You must be in good physical condition and mental
health and not under the inuence of any substance
(drugs, alcohol), which might impair vision, dexterity
or judgment.
Maximum Computed Kickback Angle
(CKA)* without using the chain brake when
using the recommended bar and chain
combinations (In this example the CKA is
21°).
Discription of symbols used on chain
saws:
CSA Z 62.1-95 and
Z 62.3-96
Class 1C
ANSI B175.1-1991
Compliance with
CSA -Standards
Compliance with
ANSI -Standard
45M6 Chain Saw listed in accordance with
American National Standard Safety Speci-
cations for Gasoline Powered Chain Saws
(ANSI B 175.1-1991).
CSA Z 62.1-95 and Z 62.3-96, Class 1C
®
C US
LISTED
Contact of the guide bar tip with
any object should be avoided!
Tip contact may cause the guide
bar to move suddenly upward
andbackward, whichmay cause
serious injury!
Always use two hands when
operating the chain saw!
Reduced Kickback Bar and
Chaincombinationthathasbeen
evaluated with the power head
to achieve kickback protection
(according to ANSI and CSA
standards).
XXX.YYY.ZZZ
XXX.YYY.ZZZ
* The Computed Kickback Angle is a calculated value
from energies measured on a test bench. It is not the
angle of the guide bar moved upward in case of a
KICKBACK.

7
3
The saw
Parts of the chain saw: illustrations and description of
parts see page 17.
WARNING !
Never modify a chain saw in any way. Only attach-
ments supplied by DOLMAR or expressly appro-
ved by DOLMAR for use with the specic saw are
authorized.
WARNING !
Bow guide bars substantially increase the potential
for kickback and severe or fatal injury due to the
greater kickback zone of the bow design. Bow guide
bars are not recommended for use on DOLMAR
chain saws nor are they approved by the ANSI B
175.1-1991 chain saw safety standard.
The use of the saw
Transporting the chain saw
WARNING!
Always stop the engine before putting a chain saw
down or carrying it. Carrying a chain saw with the
engine running is extremely dangerous. Accidental
acceleration of the engine can cause the chain to
rotate.
Avoid touching the hot mufer.
By hand: When carrying your saw by hand, the
engine must be stopped and the saw must be in
the proper position.
The chain protection cover should be over the chain
and the guide bar must point backwards. When
carrying your saw the bar should be behind you
(g. 4).
By vehicle: When transporting in a vehicle, keep
chainandbarcoveredwiththechainguard.Properly
secure your saw to prevent turnover, fuel spillage
and damage to the saw. Make sure the saw is not
exposed to heat or sparks.
4
Proper clothing
Clothing must be sturdy and snug-tting, but allow
complete freedom of movement. Avoid loose-tting
jackets, scarfs, neckties, jewelry, ared or cuffed pants,
or anything that could become entangled with the
saw or brush. Wear overalls or jeans with a reinforced
cutting resistant insert (g. 3).
Protect your hands with gloves when handling saw and
sawchain.Heavy-duty,nonslipglovesimproveyourgrip
and protect your hands.
Wear protective helmet,
eye and ear protection
Good footing is most important in chain saw work. Wear
sturdy boots with nonslip soles. Steel-toed safety boots
are recommended.
Proper eye protection is a must. Non-fogging, vented
goggles and a face screen is recommended. Their
use reduces the risk of eye and facial injury.
Wear an approved safety hard hat to protect your
head. Chain saw noise may damage your hearing.
Always wear noise protection equipment (ear plugs
or ear muffs) to protect your hearing.
Continual and regular users should have their hearing
checked regularly.

8
Chain saw operating instructions
For assembly follow the procedure in the appropriate
section "Mounting Guide Bar and Chain" of this manual.
DOLMARchain,guidebarandsprocketmustmatcheach
other (see the appropriate section in this manual).
WARNING!
Proper tension of the chain is extremely important. In
order to avoid false setting the tensioning procedure
mustbefollowedasdescribedinthismanual.Always
make sure the hexagonal nut(s) for the sprocket
guard is (are) tightened securely after tensioning
the chain. Check chain tension once more after
having tightened the nuts and thereafter at regular
intervals(alwaysbeforestartingto work).Ifthechain
becomes loose while cutting, shut off the engine and
then tighten. Never try to tighten the chain while the
engine is running!
Fueling
Your DOLMAR saw uses on oil-gasoline mixture for fuel
(see chapter "Fuel" of this manual).
5a
Wipe off any spilled fuel before starting your saw and
check for leakage.
Check for fuelleakagewhilerefuelingandduringopera-
tion. If fuel or oil leakage is found, do not start or run
the engine until leak is xed and spilled fuel has been
wiped away. Clothing with fuel on it has to be changed
immediately (this is a danger to your life!).
Avoid skin contactwithfuel. Never loosenor removethe
cap of the fuel tank while the engine is running.
Starting
Do not drop start. This method is very dangerous be-
cause you may lose control of the saw (g. 6).
WARNING!
Gasoline is an extremely ammable fuel. Use ex-
treme caution when handling gasoline or fuel mix.
Do not smoke or bring any sparks or ame near the
fuel (g. 5).
Fueling instructions
Fuel your chain saw in well ventilated areas or out-
doors. Always shut off the engine and allow it to cool
before refueling. Select bare ground for fueling and
move the chain saw at least 10 feet (3 m) from fueling
spot before starting the engine (g. 5a).
6a
6
Place the chain saw on rm ground or other solid surface
in an open area. Maintain a good balance and secure
footing. Place your right foot through the rear handle
opening and rmly grasp the front handle with your left
hand (g. 6a).
Be absolutely sure that guide bar and chain are clear of
you or all other obstructions and objects, including the
ground, because when the engine starts in semi-throttle
position, engine speed will be fast enough for the clutch
to engage the sprocket and turn the chain which may
cause a kickback.
Never attempt to start the saw when the guide bar is
in a cut or kerf.
When you pull the starter grip, don’t wrap the starter
rope around your hands. Do not allow the grip to snap
back, but guide the starter rope slowly back to permit the
rope to rewind properly. Failure to follow this procedure
may result in injury to hand or ngers and may damage
the starter mechanism.
5
10 feet

9
Important adjustments
WARNING!
At correct idle speed, chain should not turn. For di-
rections to adjust idle speed, see the appropriate
section of this instruction manual.
Do not use a saw with incorrect idle speed adjust-
ment. Adjust the idle speed yourself according to
the appropriate section of this manual.
Have your DOLMAR dealer check your saw and
make proper adjustments or repairs.
Check the saw chain tension frequently, especially
just after installing a new chain. New chains may
stretch more during their initial use. A properly ad-
justed saw chain can be pulled freely around the
guide bar by hand without sagging.Always stop the
engine and wear gloves when checking or adjusting
the chain tension.
Working conditions
Operateyourchainsawonlyoutdoors.Operatethe saw
under good visibility and daylight conditions only.
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. Clear the area
where you are working.
WARNING!
Avoid stumbling on obstacles such as stumps, roots
or rocks and watch out for holes or ditches. Be ex-
tremely cautious when working on slopes or uneven
ground. There is increased danger of slipping on
freshly debarked logs.
Cutting instructions
Always hold the saw rmly with both hands when the
engine is running. Place your left hand on the tubular
handle and your right hand on grip and throttle lever.
Left-handers should follow these instructions too.
8
7
WARNING!
Do not operate your chain saw in semi-throttle
position. Cutting in this position does not permit
the operator proper control of the saw or chain
speed.
WARNING!
Never come too close to a rotating chain with your
hands or body.
WARNING!
Do not cut any material other than wood or wooden
objects.
Use your chain saw for cutting only. It is not de-
signed for prying or shoveling away limbs, roots
or other objects.
When sawing, make sure that the saw chain does
not touch any foreign materials such as rocks,
nails and the like (g. 8). Such objects may be
ung off, damage the saw chain or cause the saw
to kick back.
Wrap your ngers tightly around the handles, keeping
the handles cradled between your thumb and foren-
ger (g. 7). With your hands in this position, you can
best oppose and absorb the push, pull and kickback
forces of your saw without having it slip out of your
grip (see section of reactive forces). Make sure your
chain saw handle and grip are in good condition and
free of moisture, pitch, oil or grease.
Always start a cut with the chain running at full speed
and the spike bar in contact with the wood.
WARNING!
Never use the saw with one hand. You cannot
control reactive forces (see pages 10 to 12) and
may lose control of the saw.

10
Position the chain saw in such a way that your body is
clear of the cutting attachment whenever the engine
is running (g. 10).
Don’t 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 (see
pages 10 to 12 ) may cause the chain to strike the
operator.
Reactive forces during the cut, including kickback
WARNING!
Reactive forces, that may occur during any cut are
kickback, pushback and pull-in. Reactive forces
can be dangerous! In any chain saw, the powerful
force used to cut wood can be reversed (and work
against the operator).
If the rotating chain is suddenly stopped by contact
withanysolidobjectlikealogorbranchorispinched,
the reactive forces instantly occur. These reactive
forces may result in loss of control which may, in
turn, cause serious or fatal injury. An understanding
of the causes of these reactive forces may help you
avoid loss of control.
The most common reactive forces are
- kickback,
- pushback,
- pull-in.
In order to keep control of your saw, always maintain
a rm foothold. Never work on a ladder, in a tree or on
any other insecure support. Never use the saw above
shoulder height (g. 9).
9
10
This reaction can occur in a fraction of a second and
under some circumstances, cause the guide bar and
chain to strike the operator with enough force to cause
severe or fatal injury. It may also occur during limbing.
It also occurs when the nose of the guide bar is pinched
unexpectedly, unintentionally contacts solid mate-
rial in the wood (g.12) or is incorrectly used to begin
a plunge or boring cut.
The greater the force of the kickback reaction, the more
difcult it becomes for the operator to control the saw.
Kickback:
Kickback occurs when the upper quadrant of the bar
nose contacts a solid object in the wood or is pinched
(g. 11). The reaction of the cutting force of the chain
causes a rotational force of the chain saw in the direc
tion opposite to the chain movement, mainly in the plane
of the bar. This may ing the bar in an uncontrolled arc
towards the operator.
11
12