Operator’s and Safety Manual
for Gasoline Chain Saws
WARNING!
Read and understand this Manual. Always follow safety precautions in the Operator’s and Safety Manual.
Improper use can cause serious injury!
Preserve this Manual carefully!
WARNING!
FUELS WITH MORE THAN 10% ETHANOL ARE NOT APPROVED FOR USE IN DOLMAR 2-STROKE ENGINES!
Use of alternative fuels, such as E-20 (20% ethanol), E-85 (85% ethanol) or any fuels not meeting DOLMAR
requirements are not approved for use in DOLMAR 2-stroke gasoline engines!
USE OF ALTERNATIVE FUELS CAN CAUSE THE FOLLOWING PROBLEMS:
Poor engine performance, loss of power, overheating, fuel vapor lock, improper clutch engagement, premature
deterioration of fuel lines, premature deterioration of gaskets, premature deterioration of carburetors.
USING ALTERNATIVE FUELS AND/OR 2-STROKE OILS NOT ACCORDING TO JASO FC OR ISO-L-EGD IN
DOLMAR 2-STROKE ENGINES WILL VOID YOUR ENGINE WARRANTY!
PS-351
PS-421
1
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
Components with evaporative emissions
Fuel tank, Fuel tank cap
OBTAINING WARRANTY SERVICE
To obtain warranty service, take your engine to the nearest DOLMAR service Center authorized by DOLMAR. Bring your sales receipts 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 operator’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 modications.
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 or info@dolmar.com 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 DURABILITY 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 emission 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
or info@dolmar.com and you will be advised of the appropriate warranty service dealer or service providers where
the warranty repair can be performed.
2
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 operator’s 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 operator’s manual. Additional operator’s manuals are available from DOLMAR
POWER PRODUCTS, PO Box 5007, Alpharetta, GA, 30005-5007, USA, Telephone 1-888-OPE-PART or info@
dolmar.com
This product complies with: American National Standard Institute B 175.1-2000 chain saw safety standard.
Canadian Standards Association Z62.1-03 chain saw safety standard.
Z62.3-04 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 operating 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 accident 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.
PS-351, PS-421
Contents Page
Delivery inventory .................................................... 4
Symbols ................................................................... 4
Safety precautions .............................................. 5-16
Denomination of components ................................ 17
Technical data........................................................18
Only for Models with fastening nuts on the sprocket guard
Mounting the guide bar and saw chain ........ 19-26
Tightening the saw chain ..................................
20
Checking the chain tension ..............................21
Retightening the saw chain ..............................21
Only for Models with QuickSet guide bar ..................
Mounting the guide bar and saw chain ............. 22
Tensioning the saw chain ................................. 23
Checking the chain tension ..............................23
Retensioning the saw chain .............................. 23
Models with quick tensioner on sprocket guard ..........
Mounting the guide bar and saw chain ............. 24
Tightening the saw chain ..................................
Checking the chain tension ..............................
Retensioning the saw chain ..............................
25
26
26
Chain brake ...........................................................26
Engaging the chain brake ...................................... 26
Fuel / Refuelling................................................27-28
Contents
Page
Chain lubrication .................................................... 29
Starting the engine ................................................30
Stopping the engine............................................... 30
Checking the chain brake ...................................... 31
Working in winter ................................................... 31
Adjusting the carburetor ........................................32
Sharpening the saw chain ................................33-34
Cleaning the brake band and sprocket interior ...... 35
Cleaning the guide bar ..........................................35
Replacing the saw chain........................................ 36
Cleaning the air lter.............................................. 37
Replacing the spark plug ....................................... 38
Checking the mufer screws .................................38
Replacing the starter cable .................................... 39
Replacing the return spring ...................................39
Mounting the fan housing ......................................39
Cleaning the cylinder area ..................................... 40
Replacing the fuel lter .......................................... 40
Replacing / cleaning the spark arrester screen ..... 40
Instructions for daily and periodic maintenance ....41
Service, spare parts and guarantee ......................42
Troubleshooting ..................................................... 43
Extract from the spare parts list ........................ 44-45
The PS-351, PS-421 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).
3
1
4
5 6 7
32
Delivery inventory
1 Chain saw
2 Guide bar
3 Saw chain
4 Chain protection cover
5 Universal wrench
6 Wrench
7 Screw driver for carburetor adjustment
8 Operator’s and Safety Manual (not shown)
In case one of the parts listed should not be included in the
delivery inventory, please consult your sales agent.
Symbols
You will notice the following symbols on the chain saw and in the Operator’s and Safety Manual:
Read Operator’s and Safety Manual
and follow the warning- and safety
Caution, kickback!
precautions!
Particular care and caution!
Chain brake
Forbidden!
Fuel and oil mixture
Wear protective helmet,
eye and ear protection!
Normal / Winter operation
Wear protective gloves!
Carburetor adjustment
No smoking!
Chain oil ll/oil pump
No open re!
Saw chain oil
adjustment screw
Stop engine!
First aid
Start engine
Do not touch
hot surfaces!
Combination switch
Start/Stop (I/O), Choke
Recycling
Safety position
4
Further
symbols
see page 6.
Safety precautions for chain saw operators
Additional safety precautions
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 and follow all safety precautions in the
operator’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 Operator’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 signicantly reduced kickback potential
are available.
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.
This contact may abruptly stop the saw chain and
in some 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 surprise. 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 cut
ting 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. Follow manufacturer’s sharpening and main-
tenance instructions for the saw chain.
F. Only use replacement bars and chains speci-
ed by the manufacturer or the equivalent.
-
The following additional safety precautions must be
observed by all users of chain saws:
1. Do not operate a chain saw when you are fatigued.
2. Use safety footwear; snug-tting clothing; protec
tive gloves; and eye, hearing, and head protection
devices.
3. Use caution when handling fuel. Move the chain
saw 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 mufer
away from your body.
9. Do not operate a chain saw that is damaged,
is improperly adjusted, or is not completely and
securely assembled. Be sure that the saw chain
stops moving 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 specically trained to do so.
16. All chain saw service, other than the items listed
in the operator’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.
-
5
max. CKA 45
O
max. CKA 40
O
C US
General Safety Precautions
XXX.YYY.ZZZ
XXX.YYY.ZZZ
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 Operator’s Manual and the safety instructions
periodically.
Maximum Computed Kickback Angle
(CKA)* without using the chain brake when
using the recommended bar and chain
combinations (In this example the CKA is 45°).
Ma ximumCompu ted Kick back Angle
(CKA)* with using the chain brake when
using the recommended bar and chain
combinations (In this example the CKA is 40°).
WARNING !
Reactive forces, including kickback, can be dangerous. Careless or improper use of any chain saw
may cause serious or fatal injury.
Have your DOLMAR dealer show you how to operate 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, especially children and animals should
not be 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).
Do not lend your chain saw without this Operator’s
and Safety Manual. Be sure that anyone using your
saw understands the information given.
Contact of the guide bar tip with
any object should be avoided!
Tip contact may cause the guide
bar to move suddenly upward
and backward, which may cause
serious injury!
Always use two hands when
operating the chain saw!
Reduced Kickback Bar and
Chain combination that has been
evaluated with the power head
to achieve kickback protection
(according to ANSI and CSA
standards).
* 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.
The operator
Physical Condition
You must be in good physical condition and mental
health and not under the inuence of any substance
(drugs, alcohol), which might impair vision, dexterity
or judgment.
2
Proper use of a chain saw involves
1. the operator
2. the saw
3. the use of the saw.
Discription of symbols used on chain
saws:
CSA Standards Z62.1-03
Class 1A Z62.3-04
ANSI Standard B175.1-2000
SAE Standard SAE J335
6
WARNING !
Prolonged use of chain saws exposing the operator
to vibrations may produce Whitenger 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 Whitenger 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.
Proper clothing
The saw
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
saw chain. Heavy-duty, nonslip gloves improve your
grip and protect your hands.
Parts of the chain saw: illustrations and description of
parts see page 17.
WARNING !
Never modify a chain saw in any way. Only at-
tachments supplied by DOLMAR or expressly
approved by DOLMAR for use with the specic
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
175.1-2000 chain saw safety standard.
The use of the saw
Transporting the chain saw
3
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.
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 mufer.
4
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).
Wear protective helmet,
eye and ear protection!
By vehicle: When transporting in a vehicle, keep
chain and bar covered with the chain guard. Properly
secure your saw to prevent turnover, fuel spillage
and damage to the saw. Make sure the saw in not
exposed to heat or sparks.
7
Chain saw operating instructions
For assembly follow the procedure in the appropriate
section "Mounting Guide Bar and Chain" of this manual.
DOLMAR chain, guide bar and sprocket must match each
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 must be followed as described in this
manual. 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 (always before starting to work).
If the chain 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).
Wipe off any spilled fuel before starting your saw and
check for leakage.
Check for fuel leakage while refueling and during operation. 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 contact with fuel. Never loosen or remove
the 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).
5
WARNING!
Gasoline is an extremely ammable fuel. Use extreme 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 outdoors. 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).
6
6a
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 semithrottle 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
10 feet
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.
5a
8
Important adjustments
WARNING!
At correct idle speed, chain should not turn. For directions to adjust idle speed, see the appropriate
section of this operator’s manual.
Do not use a saw with incorrect idle speed adjustment. 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.
Wrap your ngers tightly around the handles, keeping
the handles cradled between your thumb and forenger (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.
Check the saw chain tension frequently, especially
just after installing a new chain. New chains may
stretch more during their initial use. A properly adjusted 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
Operate your chain saw only outdoors. Operate the 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 extremely cautious when working on slopes or
uneven ground. There is increased danger of slipping on freshly debarked logs.
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.
8
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.
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.
7
WARNING!
Do not cut any material other than wood or
wooden objects.
Use your chain saw for cutting only. It is not designed 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
kickback.
9
9
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).
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 11 to 13 ) 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 with any solid object like a log or branch or is
pinched, 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.
10
11
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.
12
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 material
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 difcult it becomes for the operator to control
the saw.
Many factors inuence the occurence and force of
the kickback reaction. The type of bar and saw chain you
use is a factor in the force of the kickback reaction.
The speed of contact at which the cutter contacts
the object.
Kickback force increase with the rate of impact.
The contact angle between the nose of the bar
and the foreign object (g. 11).
Kickback is most pronounced in the upper quadrant
of the bar nose.
DOLMAR chain types are designed to reduce kickback
forces.
The depth gauges:
Improper lowering of the depth gauges also increases
the risk of a kickback.
Saw chain cutter sharpness:
13
To avoid kickback
The best protection from personal-injury that may result
from kickback is to avoid kickback situations:
1. Hold the chain saw rmly with both hands and
maintain a secure grip.
2. Be aware of the location of the guide bar nose at
all times.
WARNING!
A dull improperly sharpened chain may increase
the risk of kickback. Always cut with a properly
sharpened chain.
Devices for reducing the risk of kickback injury
DOLMAR have developed a special chain brake to
reduce the risk of kickbacks.
This chain brake increases the safety factor on the
job, e.g. when the saw suddenly bucks upwards the
chain stops rotating within a fraction of a second. A
deection guard on the disengaging lever of the chain
brake and a scoop rear handle ensure that the operator’s hands are fully protected at all times.
Kickback tendency increases as the radius or size of
the guide bar nose increases. DOLMAR have developed guide bars with small nose radius, to reduce the
kickback tendency.
WARNING!
No chain brake prevents kickback.
These brakes are designed only to stop the chain,
if activated.
To ensure a proper operation of the chain brake, it
must be properly maintained. Furthermore, there
must be a sufcient distance between the operator and the bar to ensure that the chain brake has
sufcient time to activate and stop the chain before
potential contact with the operator.
3. Never bring the nose of the guide bar in contact
with any object. Do not cut limbs with the nose of
the guide bar. Be especially careful with small,
tough limbs, small size brush and saplings which
may easily catch the chain.
4. Don’t overreach.
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 re-entering a previous
cut.
9. Do not attempt plunge cuts (see page 14) if you are
not experienced with these cutting techniques.
10. Be alert for shifting of the log or other forces that
may cause the cut to close and pinch the chain.
11. Maintain saw chain properly. Cut with a correct-
ly sharpened, properly tensioned chain at all
times.
12. Stand to the side of the cutting path of the chain
saw.
11
Pushback:
To avoid pull-in
Pushback occurs when the chain on the top of the
bar is suddenly stopped when it is pinched, caught
or encounters a foreign object in the wood. The reac-
tion of the chain drives the saw straight back toward
the operator causing loss of saw control. Pushback
fre-quently occurs when the top of the bar is used for
cutting (g. 14).
14
To avoid pushback
1. Be alert to forces or situations that may cause
material to pinch the top of the chain.
2. Do not cut more than one log at a time.
3. Do not twist the saw when withdrawing the bar
from a plunge cut or under buck cut (gures 25 to
27 and 33, pages 14 and 16), because the chain
can pinch.
Pull-in:
Pull-in occurs when the chain on the bottom of the bar
is suddenly stopped. The chain on the bottom of the
bar stops when it is pinched, caught or encounters a
foreign object in the wood (see g. 15). The reaction of
the chain pulls the saw forward, causing the operator
to lose control.
1. Always start a cut with the chain rotating at full speed
and the spike bar in contact with the wood.
2. Pull-in may also be prevented by using plastic
wedges to open the kerf or cut.
Cutting techniques
Felling
Felling is cutting down a tree.
Before felling a tree, consider carefully all conditions
which may affect the direction of fall, including:
The intended direction of the fall.
The neutral lean of the tree.
Any unusually heavy limb structure.
Surrounding trees and obstacles.
The wind direction and speed.
WARNING!
Always observe the general condition of the tree.
Look for decay and rot in the trunk. If it is rotted
inside, it could snap and fall toward the operator
while being cut.
Also look for broken or dead branches which could
vibrate loose and fall on the operator. When felling on a slope, the operator should stand on the
up-hill side.
Pull-in frequently occurs when the spike bar 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.
15
WARNING!
Use extreme caution when cutting small size brush
and saplings which may easily catch the chain and
pull you off balance.
12
16
When felling in the vicinity of roads, railways and
power lines, etc., take extra precautions (see g.
16). Inform the police, utility company or railway
authority before beginning to cut.
45°
1/10∅
1/5∅
11/
2
"
(4cm)
1
2
2
45°
= cutting down area
17
When felling, maintain a distance of at least 2 1/2 tree
lengths from the nearest person (see g. 17).
Note:
The noise of your engine may drown any warning call.
Felling instructions:
First cut
Second cut
20
If the tree has large buttress roots, cut into the largest
buttresses vertically rst (horizontally next) and remove
(g. 20).
Direction of fall
21
18
First clear the tree base and work area from interfering limbs and brush and clean its lower portion an
axe (see g. 18).
45°
19
Then, establish a path of escape and remove all obstacles. This path should be opposite to the planned
direction of the fall of the tree and at a 45° angle (g.
19). An alternate path must also be selected. Place
all tools and equipment a safe distance away from the
tree, but not on the escape path.
Felling cut
Hinge
Felling notch
22
Felling notch
Hinge
23
Then, determine the placement of the felling notch
(g. 21). The felling notch when properly placed de-
termines the direction in which the tree will fall. It is
made perpendicular to the line of fall and should be as
close to the ground as possible. Cut the felling notch
to a depth of about one-fth to one-fourth of the trunk
diameter (g. 22). It should be in no case higher than
it is deep. Make the felling notch very carefully.
13
1
2
3
Begin the felling cut slighty higher than the felling notch
and on the opposite side of the tree (g. 22). Then cut
horizontally through towards the felling notch. Apply
the chain saw with its spikes directly behind the uncut
portion of wood and cut toward the notch (g. 23).
Leave approximately 1/10 of the tree diameter uncut!
This is the hinge (g. 23). Do not cut through the hinge
because you could lose control of the direction of the
fall. Drive wedges into the felling cut where necessary
to control the direction of the fall. Wedges should be of
wood, light alloy or plastic - never of steel, which can
cause kickback and damage to the chain.
Always keep to the side of the falling tree. When the
tree starts to fall, shut off the engine, withdraw the
bar and walk away on the pre-planned escape path.
Watch out for falling limbs.
WARNING!
Be extremely careful with partially fallen trees which
are poorly supported.
Plunge-Cut Method
Timber having a diameter more than twice the length
of the guide bar reauires the use of the plunge-cut
method before making the felling cut.
First, cut a large, wide notch. Make a plunge cut in the
center of the notch.
The plunge cut is made with the guide bar nose. Begin
the plunge cut by applying the lower portion of the
guide bar nose to the tree at an angle (g. 25). Cut until
depth of the kerf is about the same as the width of the
guide bar (g. 26). Next, align the saw in the direction
When the tree hangs or for some other reason does
not fall completely, set the saw aside and pull the
tree down with a cable winch, block and tackle or
tractor. If you try to cut it down with your saw, you
may be injured.
Sectioning Method
WARNING!
Felling a tree that has a diameter greater than the
length of the guide bar requires use of either the
sectioning or plunge-cut method. These methods
are extremely dangerous because they involve
the use of the nose of the guide bar and can result
in kickback. Only properly trained professionals
should attempt these techniques.
25
in which the recess is to be cut. With the saw at full
throttle, insert the guide bar in the trunk (g. 27).
Enlarge the plunge cut as shown in illustration (g. 28)
26
24
For the sectioning method (g. 24) make the rst cut
with the guide bar fanning in toward the hinge. Then,
using the bumper spike as a pivot, reposition the saw
for the next cut. Avoid repositioning the saw more than
necessary. When repositioning for the next cut, keep
the guide bar fully engaged in the kerf to keep the
felling cut straight. If the saw begins to pinch, insert
a wedge to open the cut. On the last cut, do not cut
the hinge.
14
27
28
1
2
3
29
Bucking
Bucking is cutting a log into sections.
WARNING!
There is an extreme danger of kickback at this
point. Extra caution must be taken to maintain
control of the saw. To make the felling cut, follow
the sectioning method described previously (g.
29). If you are inexperienced with a chain saw
plunge-cutting should not be attempted. Seek the
help of a professional.
Limbing
Limbing is removing the branches from a fallen tree.
WARNING!
There is an extreme danger of kickback during the
limbing operation. Do not work with the nose of the
bar. Be extremely cautious and avoid contacting
the log or other limbs with the nose of the guide
bar. Do not stand on a log while limbing it - you
may slip or the log may roll.
31
WARNING!
1. When bucking, do not stand on the log. Make
sure the log will not roll down-hill. If on a slope,
stand on the up-hill side of the log (see g. 31).
Watch out for rolling logs.
WARNING!
2. Cut only one log at a time.
WARNING!
3. Shattered wood should be cut very carefully.
Sharp slivers of wood may be caught and ung
in the direction of the operator of the saw.
30
Start limbing by leaving the lower limbs to support
the log off the ground (g. 30). Always cut from
the top of the limb. Do not underbuck freely hanging limbs. A pinch may result or the limb may fall,
causing loss of control. If a pinch occurs, stop the
engine and remove the saw, by lifting the limb.
Be extremely cautious when cutting limbs under
tension. The limbs could spring back toward the
operator and cause loss of control of the saw or
injury to the operator.
WARNING!
32
WARNING!
4. When cutting small logs, use a sawhorse (g.
32). Never permit another person to hold the
log. Never hold the log with your leg or foot.
15
1. Relieving cut
2. Cross cut
Tension side
Pressure side
1. Relieving cut
2. Cross cut
Tension side
Pressure side
33
Maintenance and Repair
Never operate a chain saw that is damaged, improperly
adjusted or not completely or securely assembled.
Follow the maintenance and repair instructions in the
appropriate section of this manual.
WARNING !
Always stop the engine and make sure that the
chain is stopped before commencing any maintenance or repair work or cleaning the saw. Allow the
chain saw to cool off before doing any maintenance
work (burn hazard)! Chain saws with catalytic con-
verter take longer to cool down! Do not attempt
any maintenance or repair work not described in
this manual. Have such work performed by your
DOLMAR service shop only.
Maintaining and storing the saw
34
WARNING!
5. Logs under strain require special attention to
prevent the saw from pinching. The rst cut is
made on the compression side to relieve the
stress on the log (see g. 33, 34). The bucking
cut is then made as shown. If the saw pinches,
stop the engine and remove it from the log.
35
Keep the chain, bar and sprocket clean and lubricated;
replace worn sprockets or chains.
Keep the chain sharp. You can spot a dull chain when
easy-to-cut wood becomes hard to cut and burn marks
appear on the wood.
Keep the chain at proper tension. Tighten all nuts, bolts
and screws except the carburetor adjustment screws
after each use.
Keep spark plug and wire connection tight and clean.
Store saws in a high or locked place, away from
children.
WARNING!
6. Only properly trained professionals should work
in an area where the logs, limbs and roots are
tangled (i. e. a blowdown area, g. 35). Working
in blowdown areas is extremely hazardous.
WARNING!
7. Drag the logs into a clear area before cutting.
Pull out exposed and cleared logs rst.
16
Denomination of components
2
26 25
1615
181719
3
4
1
6
7
5
8
9
1112
20212324
101314
27
22
16" (400mm)
1101 123456
412.040.661
XXX.XXX. XXX Typ 194
528.092.056
DOLMAR GmbH, 22045 Hamburg, Germany
Identication plate
Indicate when ordering spare parts!
1 Handle
2 Cover
3 Hood lock
4 Tubular handle
5 Hand guard (release for chain brake)
6 Mufer
7 Spike bar
Serial no.
Year of manufacture
Starter grip
15
16 Combination switch (Choke / Start / Stop)
17 Fuel pump (Primer)
18 Throttle lever
19
Safety locking button
20 Rear hand guard
21 Fuel tank cap
8 Chain tensioning screw
9 Retaining nuts
10 Chain catch
11 Sprocket guard
12 Adjusting screw for oil pump (bottom side)
13 Fuel pump (Primer)
14 Identication plate
22
Adjusting screws for carburetor
23 Fan housing with starting assembly
24 Oil tank cap
25 Chain
26 Guide bar
(Blade)
27 Sprocket guard quick tensioner
17
Technical data
Stroke volume cu. in (cm)
PS-351 PS-421
3
2.1 (34,7) 2.6 (42,4)
Bore inch (mm) 1.50 (38) 1.65 (42)
Stroke inch (mm) 1.20 (30,6) 1.20 (30,6)
Max. power at speed hp / rpm 2,3 / 9.500 2,9 / 9.500
Max. torque at speed Nm /rpm 2,1 / 6.500 2,6 / 6.500
Idling speed / max. engine speed with bar and chain rpm 2.800 / 13.500 2.800 / 13.500
Coupling speed rpm 5.100 5.100
Sound pressure level at the operator´s ear
at full load according to ANSI B 175.1 dB(A) 100,8 100,8
Sound pressure level at the bystanders position
(50 ft/15 m distance) according to ANSI B 175.1 dB(A) 77,4 77,4
Carburetor Type diaphragm carburator with limiter caps
Ignition system Type electronic
Spark plug Type NGK CMR7A-5
or spark plug Type --
Electrode gap inch (mm) .020 (0,5)
Fuel consumption at max. load per ISO 7293 kg/h 0,79 0,96
Specic consumption at max. load per ISO 7293 g/kWh 526 480
Fuel tank capacity oz 16,2
Chain oil tank capacity oz 9,5
Mixture ratio (fuel/two-stroke oil)
- when using DOLMAR High Performance oil 50 : 1
- when using other synthetic oils (oil quality must be JASO FC or ISO-L-EGD) 50 : 1
Chain brake engages manually or in case of kickback
Sprocket pitch inch 3/8 3/8
Number of teeth Z 6 6
Chain type see the Extract from the spare-parts list
Pitch / gauge inch / (mm) 3/8 / 0,050 (1,3) 3/8 / 0,050 (1,3)
Guide bar, length of a cut inch 12, 14, 16 12, 14, 16
Guide-bar type see the Extract from the spare-parts list
Weight (fuel tank empty, without chain, guide bar and accessories) lbs 10,8 10,8
1)
Figures derived in equal part from idling, full-load and racing speed.
WARNING:
This chain saw is capable of severe kickback that coult result in serious injury to the user. Do not operate this chain
saw unless you have extraordinary cutting needs and experience and specialized training for dealing with kickback.
Chain saws with signicantly reduced kickback potential are available.
18
5 7
6 5 4
1
2
3
STOP
PUTTING INTO OPERATION
Only for models with fastening nuts
on the sprocket guard
CAUTION:
Before doing any work on the guide bar or chain, always
switch off the engine and pull the plug cap off the spark
plug (see „Replacing the spark plug“). Always wear protective gloves!
CAUTION:
Start the chain saw only after having assembled it completely and inspected.
Mounting the guide bar and saw chain
Use the universal wrench delivered with the chain saw for the
following work.
Put the chain saw on a stable surface and carry out the following
steps for mounting the guide bar and saw chain:
Release the chain brake by pulling the hand guard (1) in direction of arrow.
Unscrew retaining nuts (2).
Pull off the sprocket guard (3).
Turn chain tensioning screw (4) to the left (counter-clockwise)
until the pin (5) of the chain tensioner is underneath the threaded
pin (6).
Put on the guide bar (7). Make sure that the pin (5) of the chain
tensioner engages in the hole in the guide bar.
19
2
4
9 11
2
12
3
8
10
9
Lift the chain (9) over the sprocket (8).
CAUTION:
Do not insert the chain between the chain sprocket and the
disc.
Guide the chain from above about halfway into the groove (10)
on the guide bar.
CAUTION:
Note that the cutting edges along the top of the chain must
point in the direction of the arrow!
Pull the chain (9) around the sprocket nose (11) of the guide
bar in the direction of the arrow.
Replace the sprocket guard (3).
IMPORTANT:
Lift the saw chain over the chain catcher (12).
Tighten the nuts (2) only hand-tight to begin with.
Tightening the saw chain
Turn the chain tensioning screw (4) to the right (clockwise) until
the saw chain catches in the groove on the lower side of the
guide bar (see circle).
Slightly lift the end of the guide bar and turn the chain adjusting
screw (4) to the right (clockwise) until the chain rests against
the bottom side of the guide bar.
While still holding up the tip of the guide bar, tighten the retaining
nuts (2) with the universal wrench.
20
STOP
2
4
Checking the chain tension
The tension of the chain is correct if the chain rests against
the bottom side of the guide bar and can still be easily turned
by hand.
While doing so the chain brake must be released.
Check the chain tension frequently - new chains tend to get
longer during use!
When checking the chain tension the engine must be switched
off.
NOTE:
It is recommended to use 2-3 chains alternatively.
In order to guarantee uniform wear of the guide bar the bar
should be turned over whenever replacing the chain.
Retightening the saw chain
Loosen the nuts (2) about one turn with the universal wrench.
Raise the tip of the guide bar a little and turn the chain tensioning
screw (4) to the right (clockwise) until the saw chain is again up
against the bottom edge of the guide bar (see circle).
While keeping the tip of the guide bar raised, tighten the nuts
(2) again with the universal wrench.
21
5
7
6
1
2
3
5 4
STOP
Only for the QuickSet guide bar
CAUTION:
Before doing any work on the guide bar or chain, always
switch off the engine and pull the plug cap off the spark
plug (see „Replacing the spark plug“). Always wear protective gloves!
CAUTION:
Start the chain saw only after having assembled it completely and inspected.
On QuickSet guide bars the chain is tensioned using a toothed rack in the bar. This simplies retensioning of the chain.
These models do not have a conventional chain tensioner. QuickSet guide bars are identied by this symbol:
Mounting the guide bar and saw chain
Use the universal wrench delivered with the chain saw for the
following work.
Put the chain saw on a stable surface and carry out the following
steps for mounting the guide bar and saw chain:
Release the chain brake by pulling the hand guard (1) in direction of arrow.
Unscrew retaining nuts (2).
Pull off the sprocket guard (3).
Put the guide bar (4) on and push it against the sprocket (5).
Lift the chain (6) over the sprocket (5).
CAUTION:
Do not insert the chain between the chain sprocket and the
disc.
Guide the chain from above about halfway into the groove (7)
on the guide bar.
CAUTION:
Note that the cutting edges along the top of the chain must
point in the direction of the arrow!
22
6 8
2
9
3
2 10
STOP
Pull the chain (6) around the sprocket nose (8) of the guide
bar in the direction of the arrow.
Replace the sprocket guard (3).
IMPORTANT:
Lift the saw chain over the chain catcher (9).
Tighten the nuts (2) only hand-tight to begin with.
Tensioning the saw chain
Turn the QuickSet chain tensioner (10) to the right (clockwise)
using the combination tool, until the saw chain guide elements
engage in the guide groove on the bottom of the guide bar (if
necessary, pull the chain into position slightly).
Raise the tip of the guide bar slightly and turn the chain tensioner
(10) further until the saw chain is ush against the bottom of the
guide bar (see circle).
While still holding up the tip of the guide bar, tighten the retaining
nuts (2) with the universal wrench.
NOTE: If the guide bar has been turned over, turn the chain
tensioner to left (i.e. counter-clockwise) to tighten the chain.
Checking the chain tension
The tension of the chain is correct if the chain rests against
the bottom side of the guide bar and can still be easily turned
by hand.
While doing so the chain brake must be released.
Check the chain tension frequently - new chains tend to get
longer during use!
When checking the chain tension the engine must be switched
off.
NOTE: It is recommended to use 2-3 chains alternatively.
In order to guarantee uniform wear of the guide bar the bar
should be turned over whenever replacing the chain.
Retensioning the saw chain
Use the combination tool to loosen the fastening nuts (2)
about one turn. Raise the tip of the guide bar slightly and turn
the QuickSet chain tensioner (10) to the right (clockwise) until
the saw chain is again ush against the bottom of the guide
bar (see circle).
While still holding up the tip of the guide bar, tighten the retaining
nuts (2) with the universal wrench.
23
1
2
3
4
7
9
8
6 5
STOP
Only for models with quick tensioner
on sprocket guard
CAUTION:
Before doing any work on the guide bar or chain, always
switch off the engine and pull the plug cap off the spark
plug (see „Replacing the spark plug“). Always wear protective gloves!
CAUTION:
Start the chain saw only after having assembled it completely and inspected.
Mounting the guide bar and saw chain
Place the saw on a stable surface and perform the following
work steps in order to install the guide bar and saw chain:
Release the chain brake by pulling the hand guard (1) in direc-
tion of arrow.
Fold up the sprocket guard quick tensioner (2) (see also the
illustration on tensioning the saw chain).
Push the sprocket guard quick tensioner in forcefully against
the spring tension and slowly turn counter-clockwise, until
you feel it engage. Keep pushing, and turn as far as possible
counter-clockwise.
Release the sprocket guard quick tensioner again and turn
clockwise to bring it back to its original position. Repeat this
procedure until the sprocket guard (4) is unscrewed.
Remove the sprocket guard (4).
24
Put the guide bar (5) on and push it against the sprocket (6).
Lift the chain (8) over the sprocket (7).
CAUTION:
Do not insert the chain between the chain sprocket and the
disc.
Guide the chain from above about halfway into the groove (9)
on the guide bar.
CAUTION:
Note that the cutting edges along the top of the chain must
point in the direction of the arrow!
8 10
12
11
4
3
2
15
Pull the chain (8) around the sprocket nose (10) of the guide
bar in the direction of the arrow.
Line up the holes in the sprocket guard (4) with the pins (11).
Turn the chain tensioning screw (B/3) to get the chain tensioning pin (12) aligned with the hole in the guide bar.
Push the sprocket guard (4) onto the pin (11).
Tightening the saw chain
Simultaneously push in hard on the sprocket guard quick tensioner (2) and turn it clockwise to screw the sprocket guard on,
but do not yet tighten it.
Raise the tip of the guide bar slightly and turn the chain tensioner
(3) clockwise until the saw chain is ush against the bottom of
the guide bar (see circle).
Push the sprocket guard quick tensioner (2) in again and tighten by turning clockwise.
Release the sprocket guard chain tensioner until it turns freely,
then fold it in between protective ribs (15) as shown in the
illustration.
25
12
1
Checking the chain tension
STOP
2
The tension of the chain is correct if the chain rests against
the bottom side of the guide bar and can still be easily turned
by hand.
While doing so the chain brake must be released.
Check the chain tension frequently - new chains tend to get
longer during use!
When checking the chain tension the engine must be switched
off.
NOTE: It is recommended to use 2-3 chains alternatively.
In order to guarantee uniform wear of the guide bar the bar
should be turned over whenever replacing the chain.
Retensioning the saw chain
All that is necessary to retension the saw chain is to loosen the
quick tensioner (2) slightly as described under “Mounting the
guide bar and saw chain”.
Tension the chain as already described.
Chain brake
The PS-351 and PS-421 comes with an inertia chain brake as
standard equipment. If kickback occurs due to contact of the
guide-bar tip with wood (see SAFETY PRECAUTIONS, page 6),
the chain brake will stop the chain through inertia if the kickback
is sufciently strong.
The chain will stop within a fraction of a second.
The chain brake is installed to block the saw chain before
starting it and to stop it immediately in case of an emergency.
IMPORTANT: NEVER run the saw with the chain brake activated (except for testing, see “Testing chain brake”)! Doing so
can very quickly cause extensive engine damage!
ALWAYS release the chain brake
before starting the work!
Engaging the chain brake (braking)
If the kickback is strong enough the sudden acceleration of the
guide bar combined with the inertia of the hand guard (1) will
automatically actuate the chain brake.
To engage the chain brake manually, simply push the hand
guard (1) forward (towards the tip of the saw) with your left
hand (arrow 1).
Releasing the chain brake
Pull the hand guard (1) towards you (arrow 2) until you feel it
catch. The brake is now released.
26
Fuel
CAUTION:
This saw is powered by petroleum products (gasoline
(petrol) and oil).
Be especially careful when handling gasoline (petrol).
Do not smoke. Do not allow gasoline to come near ames,
sparks or re (explosion hazard).
Gasoline
50:1
DOLMAR oil other oil
50:1
Fuel mixture
This tool is powered by a high-performance air-cooled two-stroke
engine. It runs on a mixture of gasoline and two-stroke engine
oil.
The engine is designed for unleaded regular gasoline with a
min. octane value of 91 (R+M)/2. In case no such fuel is available, you can use fuel with a higher octane value. This will not
affect the engine.
In order to obtain an optimum engine output and to protect
your health and the environment use unleaded fuel only.
To lubricate the engine, use a synthetic oil for two-stroke aircooled engines (quality grade: JASO FC or ISO-L-EGD), which
has to be added to the fuel. The engine has been designed for
use of DOLMAR High Performance two-stroke engine oil and a
mixture ratio of ONLY 50:1 to protect the environment. In addition,
a long service life and reliable operation with a minimum emis-
sion of exhaust gases are ensured. DOLMAR High Performance
two-stroke engine oil is available in the following sizes:
2.6 oz order number 986 100 100
6.4 oz order number 986 100 101
In case DOLMAR High Performance two-stroke engine oil is not
available, it is recommended to use a mixture ratio of 50:1 with
other synthetic two-stroke engine oils, as otherwise optimum
operation of the engine cannot be guaranteed.
The correct mixture ratio:
50:1 when using DOLMAR High Performance two-stroke
engine oil, i. e. mix 50 parts gasoline with 1 part oil.
when using other synthetic two-stroke engine oils
50:1
(quality grade JASO FC or ISO L EGD), i. e. mix 50 parts
gasoline with 1 part oil.
NOTE:
For preparing the fuel-oil mixture rst mix the entire oil quantity with
half of the fuel required, then add the remaining fuel. Thoroughly
shake the mixture before lling it into the chain saw tank.
+
1.0 Us-gal. (3.7 l)
2.5 Us-gal. (9.4 l)
5.0 Us-gal. (18.9 l)
It is not wise to add more engine oil than specied to
ensure safe operation. This will only result in a higher
production of combustion residues which will pollute the
environment and clog the exhaust channel in the cylinder
as well as the mufer. In addition, fuel consumption will
rise and performance will decrease.
2.6 oz. (75 cm3)
6.4 oz. (189 cm3)
12.8 oz. (378 cm3)
The Storage of Fuel
Fuels have a limited storage life. Fuel and fuel mixtures
age through evaporation, especially at high temperatures.
Aged fuel and fuel mixtures can cause starting problems
and damage the engine.Purchase only that amount of fuel,
which will be consumed over the next few months. At high
temperatures, once fuel has been mixed it should be used
up in 6-8 weeks.
Use only approved and marked containers for transport
and storage. Store fuel only in dry, cool and secure
locations!
AVOID SKIN AND EYE CONTACT
Mineral oil products degrease your skin. If your skin comes in
contact with these substances repeatedly and for an extended
period of time, it will desiccate. Various skin deseases may
result. In addition, allergic reactions are known to occur.
Eyes can be irritated by contact with oil. If oil comes into your
eyes, immediately wash them with clear water.
If your eyes are still irritated, see a doctor immediately!
Chain oil
Use an oil with adhesive additive for lubricating the chain and
guide bar. The adhesive additive prevents the oil from being
ung off the chain too quickly.
We recommend the use of chain oil which is bio-degradable in
order to protect the environment. The use of bio-degradable oil
may even be required by local regulations.
The chain oil BIOTOP sold by DOLMAR is made of special
vegetable oils and is 100% bio-degradable. BIOTOP has been
granted the "blue angel" (Blauer Umweltschutz-Engel) for being
particularly environment-friendly (RAL UZ 48).
BIOTOP chain oil is available in the following sizes:
1 l order number 980 008 210
5 l order number 980 008 211
20 l order number 980 008 213
Bio-degradable oil is stable only for a limited period of
time. It should be used within 2 years from the date of
manufacture (printed on the container).
27
STOP
Important note on bio-degradable chain oils
If you are not planning to use the saw again for an extended period of time, empty the oil tank and put in a
small amount of regular engine oil (SAE 30), and then
run the saw for a time. This is necessary to ush out all
remaining bio-degradable oil from the oil tank, oil-feed
system, chain and guide bar, as many such oils tend to
leave sticky residues over time, which can cause damage
to the oil pump or other parts.
waste oil
The next time you use the saw, ll the tank with BIOTOP
chain oil again. In case of damage caused by using waste
oil or unappropriate chain oil the product guarantee will be
null and void.
Your salesman will inform you about the use of chain oil.
NEVER USE WASTE OIL
Waste oil is very dangerous for the environment.
Waste oil contains high amounts of carcinogenic substances.
Residues in waste oil result in a high degree of wear and tear
at the oil pump and the sawing device.
In case of damage caused by using waste oil or unappropriate
chain oil the product guarantee will be null and void.
Your salesman will inform you about the use of chain oil.
AVOID SKIN AND EYE CONTACT
Mineral oil products degrease your skin. If your skin comes in
contact with these substances repeatedly and for an extended
period of time, it will desiccate. Various skin deseases may result.
In addition, allergic reactions are known to occur.
Eyes can be irritated by contact with oil. If oil comes into your
eyes, immediately wash them with clear water.
If your eyes are still irritated, see a doctor immediately!
chain oil
fuel/oil mixture
Refuelling
FOLLOW THE SAFETY PRECAUTIONS!
Be careful and cautious when handling fuels.
The engine must be switched off!
Thoroughly clean the area around the caps, to prevent dirt from
getting into the fuel or oil tank.
Unscrew the tank cap (use the universal wrench if necessary,
see illustration) and ll tank with fuel mixture or saw chain oil
up to the bottom edge of the lling neck. Be careful not to spill
fuel or chain oil!
Screw on the tank cap by hand all the way.
After refuelling, clean screw cap, tank and check for
lekages.
Lubricating the chain
During operation there must always be sufcient chain oil in the
chain-oil tank to provide good chain lubrication. At medium oil
feed rate, the oil tank holds enough for one fuel tank’s worth
of operation. During this procedure check whether there is
enough the chain oil in the tank and rell if necessary. Do this
only with the engine turned off! Screw on the tank cap by
hand all the way.
28
2 3
1
+
-
STOP
Checking the chain lubrication
Never work with the chain saw withoute sufcient chain lubri-
cation. Otherwise the service life of the chain and guide bar
will be reduced. Before starting work check the oil level in the
tank and the oil feed.
Check the oil feed rate as described below:
Start the chain saw (see „Starting the engine”).
Hold the running chain saw approx. 6” (15 cm) above a trunk
or the ground (use an appropriate base).
If the lubrication is sufcient, you will see a light oil trace because oil will be ung off the sawing device. Pay attention to the
direction the wind is blowing and avoid unnecessary exposure
to the oil spray!
Note:
After the saw has been turned off it is normal for residual chain
oil to drip from the oil feed system, the guide bar and the chain
for a time. This does not constitute a defect!
Place the saw on a suitable surface.
Adjusting the chain lubrication
The engine must be switched off!
You can adjust the oil pump feed rate with the adjusting screw
(1). The adjusting screw is on the bottom side of the housing.
The oil pump comes factory-set to a medium feed rate. You
can set the chain oil feed rate to minimum, moderate, and
maximum feed rate.
To adjust the supply rate, use a small screwdriver to turn the
adjusting screw:
• to the right for a faster
• to the left for a slower
oil feed rate.
Pick one of the three settings depending on the length of the
guide bar.
While working make sure there is enough chain oil in the tank.
If necessary, add oil.
To ensure troublefree operation of the oil pump the oil guide
groove at the crank case (2) and the oil inlet bore in the guide
bar (3) must be cleaned regularly.
Note:
After the saw has been turned off it is normal for residual chain
oil to drip from the oil feed system, the guide bar and the chain
for a time. This does not constitute a defect!
Place the saw on a suitable surface.
29
STOP
1
45 3
2
STOP
ON
Starting the engine
Do not start the chain saw until after it is completely assembled and checked!
Move at least 3 meters / 10 feet away from the place where the
chain saw was fuelled.
Make sure you have a secure footing, and place the saw on
the ground in such a way that the guide bar and chain are not
near anything.
Actuate the chain brake (block it).
Hold the front handle rmly with one hand and press the saw
against the ground.
Hold the down rear handguard with your right foot as shown.
Note: The Featherlight-Start System lets you start the saw
without effort. Go through the starting procedure smoothly and
evenly.
Cold starting:
Prime the fuel pump (5) by pressing it several times until you
can see fuel in the pump.
Move the combination switch (1) up (choke position). This also
actuates the half-throttle lock.
Pull the starter handle (2) smoothly and evenly.
CAUTION: Do not pull the starter cable more than about 20”
(50cm) out, and let it back in slowly by hand.
Repeat the starting procedure twice.
Move the combination switch (1) to the central “ON” position.
Pull the starter handle smoothly and evenly again. As soon as
the engine is running, grasp the rear handle (the safety lock
button (3) is actuated by the palm of the hand) and press the
throttle trigger (4).
CAUTION: The engine must be put in idle immediately after
starting. If this is not done, the clutch can be damaged.
Cold start (Choke)
Warm start (ON)
Engine off
Combination switch
in safety position
(ignition current cut off,
necessary for all maintenance, repair, and instal-
lation work)
Now disengage the chain brake.
Warm starting:
As described above for cold starting, but before starting push
the combination switch (1) up (Choke position) and
then right away back to the middle “ON” position. This is only
to engage the half-throttle lock. If the engine doesn’t start after
2 or 3 pulls, repeat the entire starting procedure as described
for cold starting.
NOTE: If the engine was switched off only for a short time, the
saw can be started without using the combination switch.
Important: If the fuel tank has been completely emptied and the
engine has stopped due to lack of fuel prime the fuel pump (5) by
pressing it several times until you can see fuel in the pump.
Stopping the engine
Depress the combination switch (1).
NOTE: After being pressed down, the combination switch will
revert to the ON position again. The engine is switched off, but can
be turned on again without moving the combination switch.
IMPORTANT: To cut off the ignition current, push the combination switch all the way down past the resistance point to the
safety position ( ).
30
7
8
6
STOP
Checking the chain brake
The chain brake must be checked before every use of the
saw!
Start the engine as described above (have a secure footing,
place the chain saw on the ground so that the chain and guide
bar are not near anything).
Hold the front handle rmly, with your other hand on the rear
grip.
Let the engine run at medium speed and push the handguard
(6) in the direction of the arrow using the back of your hand,
until the chain brake engages. The chain should now stop immediately.
Bring the engine back to idle and release the chain brake.
Caution: If the chain does not stop immediately in this test,
turn off the engine immediately. Do NOT use the chain saw
in this condition! Contact a DOLMAR service center.
Working in winter
In order to prevent carburetor icing in conditions of low tempe-
rature combined with high humidity, and below + 40°F (+ 5°C)
in order to get up to operating temperature faster, heated air
can be taken from the cylinder.
Remove the cover (see “Cleaning the air lter”).
Remove the insert (7) and insert it as shown for winter operation.
If the temperature is above + 40°F (+ 5°C) the engine needs
to induct cold air. If this is not done, the cylinder and piston
can be damaged!
For temperatures above + 40°F (+ 5°C) turn the insert 180° so
that after it is inserted the induction opening (8) is closed.
Put the cover back on.
Symbol visible - Normal operation
Symbol visible - Winter operation
31
S HL
Adjusting the carburetor
CAUTION: Carburetor adjustment may only be done by a
specialist DOLMAR service center!
SERVICE
SERVICE
Do not undertake any adjustments to adjusting screws (H)
and (L) without a tachometer! Incorrect adjustment can lead
to engine damage!
A tachometer is needed for adjustments to adjusting screws
(H) and (L), because if the engine runs over its maximum
rated speed, it can overheat and run out of lubricant. This
can damage the engine!
Only adjusting screw (S) can be manipulated by the user.
If the saw chain moves in idle (i.e. without the throttle being
pressed), it is imperative to correct the idle speed!
Do not adjust the idle speed until after complete assembly
and testing of the saw!
Idle speed adjustment must only be undertaken when
the engine is warm, with a clean air lter and properly installed guide bar and chain.
Use a screwdriver (5/32” (4 mm) blade) for idle adjustments.
Adjusting the idle speed
Turn adjusting screw (S) counter-clockwise (unscrew): Idle
speed decreases.
Turn adjusting screw (S) clockwise (screw in): Idle speed
increases.
Important: If the saw chain still moves during idle even
after you have adjusted the idle speed, do NOT use the
saw. Take it to a DOLMAR service center!
Note:
Carburetor adjustment aids in proper functioning, economical consumption, and safe operation.
Because of new exhaust regulations, the carburetor adjusting screw (H) now comes with a limit feature. The reduced
adjustment range (about 180 degrees) prevents excessively
rich carburetor settings. On some models, the adjusting screw
(H) is locked. This ensures compliance with exhaust regulations, as well as good engine functioning and economical fuel
consumption.
32
α
α
ββ
min.
0.11” (3 mm)
STOP
MAINTENANCE
Sharpening the saw chain
CAUTION: Before doing any work on the guide bar or chain,
always switch off the engine and pull the plug cap off the
spark plug (see „Replacing the spark plug“). Always wear
protective gloves!
The chain needs sharpening when:
The sawdust produced when sawing damp wood looks like
wood our.
The chain penetrates the wood only under great pressure.
The cutting edge is visibly damaged.
The saw is pulled to the left or right when sawing. This is caused
by uneven sharpening of the chain.
Important: Sharpen frequently, but without removing too
much metal!
Generally, 2 or 3 strokes of the le will be enough.
Have the chain resharpened at a service center when you have
already sharpened it yourself several times.
Proper sharpening:
CAUTION: Use only chains and guide bars designed for
this saw (see the Extract from the spare-parts list)!
All cutters must be of the same length (dimension a). Cutters
with different lengths result in rough running of the chain and
can cause cracks in the chain.
The minimum cutter length: 0.11” (3 mm). Do not resharpen
the chain when the minimum cutter length has been reached;
at this point, the chain must be replaced (see the Extract from
the spare-parts list and „Replacing the saw chain“).
The depth of the cut is determined by the difference in height
between the depth limiter (round nose) and the cutting edge.
The best results are obtained with a depth-limiter depth of .025”
(0.64 mm).
CAUTION: Excessive depth
increases the risk of kickback!
The sharpening angle (α) must be identical for all cutters!
30° for chain type 092, 484
.025”
(0,64 mm)
.025”
(0,64 mm)
The teeth will have the proper angle (ß) automatically if the
proper round le is used.
80° for chain type 092, 484
Different angles result in a roughly, irregularly running chain,
increase wear and tear and cause chain beakage.
33
1 2
Chain typ
092 (3/8")
α
Chain typ
484 (.325")
4/5
Files and how to work with them
Use a special saw chain round le for sharpening. Standard round
les are unsuitable. For the order number, see “Accessories”.
Type 484: File the rst cutter half with a 3/16” (4,8 mm) dia. round
saw-chain le, then switch to a 11/64” (4.5 mm) dia. le.
Type 092: Saw chain round le, dia. 5/32” (4.0 mm).
The le should cut only when pushed forwards (arrow). Lift the
le when leading it backwards.
First sharpen the shortest cutter. The length of this cutter is then
the standerd for all other cutters of the chain.
New saw teeth must be led to the exact same shape as the
used teeth, including on their running surfaces.
File depending on chain type (90° or 10° to the guide bar).
A le holder makes le guidance easier. It is marked for the
correct sharpening angle of:
α = 25°
α = 30°
α = 35°
(keep the marks parallel with the chain when ling, see illustration)
and limits the cut depth to the correct 4/5 of the le diameter.
See "Accessories" for the order number.
34
After having sharpened the chain, the height of the depth limiter
must be checked by means of a chain gauge. See „Accessories“
for the order number.
Correct even the smallest excess height with a special at
le (1). See „Accessories“ for the order number.
Round off the front of the depth limiter (2).
Cleaning the inside of the sprocket guard
4
5
1
3 2
6 7
CAUTION: Before doing any work on the guide bar or chain,
always switch off the engine and pull the plug cap off the
spark plug (see „Replacing the spark plug“). Always wear
protective gloves!
CAUTION: Start the chain saw only after having assembled
it completely and inspected.
Remove the sprocket guard (1) (see PUTTING INTO OPERATION for the correct model) and clean out the interior with a
brush.
Remove the chain (2) and guide bar (3).
NOTE:
Make sure there are no residues or foreign matter remaining in
the oil guide groove (4) or on the chain tensioner (5).
To install the guide bar, saw chain, and sprocket guard, see
PUTTING INTO OPERATION for the correct model.
NOTE:
The chain brake is a very important safety device and like
any other component subject to normal wear and tear.
Regular inspection and maintenance are important for
your own safety and must be done by a DOLMAR service
center.
Cleaning the guide bar
CAUTION: Protective gloves must be worn.
Regularly inspect the bearing surfaces of the guide bar (7) for
damage, and clean them with a suitable tool.
Keep the two oiling holes (6) and the entire guide bar clean and
free of foreign matter!
SERVICE
35
8
12
1 1
9
Replacing the saw chain
CAUTION: Use only chains and guide bars designed for this saw (see the Extract from the spare-parts list)!
When changing the type of chain, the complete clutch drum (12) must be changed to t the different chain. If necessary, replace it.
Check the sprocket before mounting a new chain.
Worn out sprockets (8) may damage the new chain and must
therefore be replaced.
Remove the sprocket guard (See „PUTTING INTO OPERATION“).
Remove the chain and guide bar.
Remove circlip (9).
CAUTION: The circlip will pop out of the groove. When removing
it, hold your thumb against it to prevent it from popping off.
Remove thrust washer (11).
If the sprocket (8) is worn out, the complete clutch drum (12)
will need to be replaced (for the part number, see “Extract from
the spare parts list”).
Install a complete new clutch drum (12), cup washer (11) and
new circlip (9) (for the part numbers, see “Extract from the
spare parts list”).
For replacing the guide bar, chain, and sprocket see „PUTTING
INTO OPERATION“.
NOTE:
Don’t use a new chain on a worn chain sprocket. By the time
2 chains have worn, the sprocket has become worn out, so
it should be replaced at least at every second chain replacement. To distribute the chain oil evenly, run a new chain at
half-throttle for a few minutes before use.
New chains stretch, so check the chain tension frequently (see
“Checking the chain tension”).
36
Cleaning the air lter
1
2
7
3
4
5
3
4
6
CAUTION: To prevent eye injury, always wear eye protection
when cleaning the lter with compressed air!
Do not use fuel to clean the air lter.
Unscrew the hood lock (1) counter-clockwise and remove the
hood (2).
Push up the combination switch (3) (Choke position) to prevent
dirt particles from falling into the carburetor.
Pull the air lter (4) up and out.
IMPORTANT: Cover the intake opening with a clean cloth to
prevent dirt particles from getting into the carburetor.
Choosing the right lter: The eece lter is for use in dry or
dusty conditions. The nylon lter (available as accessory) is for
use in damp conditions.
Pry apart the top and bottom of the air lter as shown in Figure.
Cleaning the eece lter: Carefully tap out dust or carefully
blow out dust from the inside with compressed air. Do not
brush the eece, as this will force dirt particles into the fabric.
If the lter is very dirty, it can be washed in lukewarm water
with regular dishwashing detergent. Note that the eece lter
does not need to be cleaned until there is a noticeable loss of
power. If cleaning the lter does not bring an improvement in
performance, it is time to replace it.
Cleaning the nylon lter: Use a soft brush or blow out dirt
from the inside with compressed air. If the lter is very dirty, it
can be washed in lukewarm water with regular dishwashing
detergent. Clean frequently (several times a day) when working
in very dusty or dirty conditions. Full engine power is possible
only with a clean air lter!
Let the air lter dry completely.
Put the top and bottom sections back together.
Before assembling the air lter, check the choke ap for any dirt
particles. If there are any, remove them with a brush.
Clean the area around the O-ring (5) at the induction opening.
If the O-ring is damaged, replace it!
CAUTION: If the air lter becomes damaged, replace imme-
diately! Pieces of cloth or large dirt particles can destroy
the engine!
Insert an air lter (4).
Push down the combination switch (3) and press the throttle
(6) all the way down one time in order to deactivate the throttle lock.
Put the hood (2) back on, rst guiding the two holders (7) into
their slots.
Screw the hood lock (1) back on tightly clockwise.
37
11 12
13
STOP
Replacing the spark plug
STOP
8
.020”
(0,5 mm)
9
10
CAUTION:
Do not touch the spark plug or plug cap if the engine is
running (high voltage).
Switch off the engine before starting any maintenance work.
A hot engine can cause burns. Wear protective gloves!
The spark plug must be replaced in case of damage to the
insulator, electrode erosion (burn) or if the electrodes are very
dirty or oily.
Remove the lter cover (see „Cleaning the air lter“).
Pull the plug cap (8) off the spark plug. Use only the combination
wrench supplied with the saw to remove the spark plug.
Electrode gap
The electrode gap must be .020" (0.5 mm).
CAUTION: Use only the following spark plugs:
NGK CMR7A-5.
Checking the ignition spark
Insert combination tool between hood and cylinder as shown.
CAUTION! Do not insert the combination tool into the
spark plug hole! Make contact only with the cylinder (oth-
erwise you might damage the engine).
Using insulated pliers, press the unscrewed spark plug (9)
against the combination tool (away from the spark plug hole)
with the spark plug cap rmly on the plug.
Put combination switch (10) in the ON position.
Pull the starter cable hard.
If the function is correct, an ignition spark must be visible near
the electrodes.
Checking the mufer screws
38
Unscrew 3 screws (11) and remove the upper half of the muf-
er (12).
Note: For saw models with catalytic converters (PS-351, PS-
421), remove the converter along with the upper mufer half.
The screws on the bottom mufer half (13) are now accessible,
and it is possible to check them for tightness. If they are loose,
tighten by hand (Caution: do not over-tighten).
1
2
9
4
10
12
11
7
8
6
5
13
3
14
Replacing the starter cable/ Replacing the return
spring pack/Replacing the starter spring
Unscrew four screws (1).
Remove fan housing (2).
Remove the air guide (3) from the fan housing.
CAREFUL! Injury hazard! Do not unscrew screw (7) if the
return spring is under tension.
If the starter cable is to be replaced although it is not broken,
it will be necessary to rst de-tension the cable drum return
spring (13).
To do this, use the grip to pull the cable all the way out of the
fan housing.
Hold the cable drum with one hand, and with the other push the
cable into the space (14).
Carefully let the drum turn until the return spring is no longer
under tension.
Unscrew screw (7) and remove the driver (8) and spring (6).
Carefully remove the cable drum.
Remove any cable pieces.
Thread a new cable (dia. 0,14” (3.5 mm), length 35,4” (900
mm)) as shown in the illustration (don’t forget the washer (10))
and knot both ends as shown.
Pull knot (11) into the cable drum (5).
Pull knot (12) into the starter grip (9).
Put the drum on its spindle and turn it slightly until the return
spring engages.
Place the spring (6) in the driver (8) and place them together
in the cable drum (5) while turning slightly counter-clockwise.
Insert screw (7) and tighten.
Guide the cable into the slot (14) on the cable drum and turn
the drum with the cable clockwise three times.
Hold the cable drum with your left hand and with your right hand
untwist the cable, pull it tight and hold it.
Carefully release the cable drum. The spring will wind the cable
around the drum.
Repeat the procedure once. The starter grip should now stand
straight up on the fan housing.
NOTE: With the cable pulled all the way out, it must still be
possible to turn the pulley another 1/4 turn against the return
spring.
CAUTION: Danger of injury! Secure the cable grip when
pulled out! It will whip back if the cable pulley is released
by accident.
Replacing the return spring pack
Disassemble the fan housing and cable drum (see above).
CAREFUL! Injury hazard! The return spring can pop out!
Always wear eye protection and protective gloves!
Lightly tap the fan housing on a wooden surface with the entire
surface of the hollow side, and hold it down. Now lift the fan
housing carefully and in small steps. This will allow the return
spring pack (13), which should now have fallen out, to relax in
a controlled manner if the return spring has popped out of the
plastic pack.
Carefully insert a new return spring cassette and press down
until it engages.
Place the cable drum on it and turn it slightly until the return
spring engages.
Install the spring (6) and driver (8) and screw on tight with
screw (7).
Tension the spring (see above).
Replacing the starter spring
NOTE: If the spring (6) in the Featherlight-Starting system is
broken, more effort will be required to start the engine and you
will notice some resistance when pulling the starter cable. If
you notice this, check the spring (6) and replace if necessary.
Mounting the fan housing
Insert the air guide (3) in the fan housing so that the two
recesses (4) engage.
Position the fan housing against the housing, press against it
lightly and pull the starter grip until the starter engages.
Tighten screws (1).
39
16
STOP
Cleaning the air lter compartment / fan com-
17
19 18
STOP
15
15
partment
Remove cover.
Remove the fan housing.
CAUTION: To prevent eye injury, always wear eye protection
when cleaning the lter with compressed air!
The entire area (15) can now be brushed clean or cleaned with
compressed air.
Cleaning the cylinder ns
A bottle brush can be used to clean the cylinder ns.
Replacing the fuel lter
The felt lter (16) of the suction head can become clogged.
It is recommended to replace the suction head once every
three months in order to ensure unimpeded fuel ow to the
carburetor.
To remove the suction head for replacement, pull it out through
the tank ller neck using a piece of wire bent at one end to
form a hook.
Replacing/cleaning the spark arrester screen
The spark arrester screen should be checked and cleaned
regulary.
Loosen the screws (17) and remove the thermal shield (18).
and then the spark arrester screen (19).
Caution: Do not use sharp or pointed objects for screen cleaning.
Damaged or misformed screen wires may result.
Reassembly the spark arrester screen as soon as the thermal
shield and tighten the screws.
40
Instructions for periodic maintenance
To ensure long life, prevent damage and ensure the full functioning of the safety features the following maintenance must be performed regularly. Guarantee claims can be recognized only if this work is performed regularly and properly. Failure to perform the
prescribed maintenance work can lead to accidents!
The user of the chain saw must not perform maintenance work which is not described in the operator’s manual. All such work must
be carried out by a DOLMAR service center.
Page
General Chain saw Clean exterior, check for damage. In case of damage,
have repaired by a qualied service center immediately
Saw chain Sharpen regulary, replace in good time 33-34
Chain brake Have inspected regularly at an authorized service center
Guide bar Turn over to ensure even wear of bearing surfaces
Replace in good time 21,35
Starter cable Check for damage. Replace if damaged. 39
Before each start Saw chain Inspect for damage and sharpness 33-34
Check chain tension 21,25
Guide bar Check for damage
Chain lubrication Functional check 29
Chain brake Functional check 31
Combination switch,
Safety locking button,
Throttle lever Functional check 30
Fuel/oil tank
cap Check for tightness and lekages
Every day Air lter Clean (several times daily if necessary) 37
Guide bar Check for damage, clean oil intake bore 35
Guide bar support Clean, in particular the oil guide groove 29,35
Idle speed Check (chain must not run) 32
Every week Fan housing Clean to maintain good cooling air ow. 17
Air lter compartment Clean to maintain good cooling air ow. 40
Fan compartment Clean to maintain good cooling air ow. 40
Cylinder ns Clean to maintain good cooling air ow. 40
Spark plug Check and replace if necessary 38
Mufer Check tightness of mounting, Check screws 17, 38
Chain guide Check 17
Screws and nuts Check their condition and that they are rmly secured.
Spark arrester screen Clean
Every 3 months Fuel lter Replace 40
Fuel, oil tanks Clean
Annually Chain saw Check at an authorized service center
Storage Chain saw Clean exterior, check for damage. In case of damage,
have repaired by a qualied service center immediately
Guide bar/chain Demount, clean and oil slightly
Clean the guide groove of the guide bar 35
Fuel, oil tanks Empty and clean
Carburetor Run empty
or replace if necessary 40
41
Service, spare parts and guarantee
Maintenance and repair
The maintenance and repair of modern engines as well as all safety devices require qualied technical training and a special workshop equipped with special tools and testing devices.
Any work not described in this Manual may be performed only by a DOLMAR service center.
The DOLMAR service centers have all the necessary equipment and skilled and experienced personnel, who can work out cost-
effective solutions and advise you in all matters.
Repair attempts by third parties or unauthorized persons will void all warranty claims.
Please contact your nearest service center.
Spare parts
Reliable long-term operation, as well as the safety of your chain saw, depend among other things on the quality of the spare parts
used. Use only original DOLMAR parts, marked
Only original spare parts and accessories guarantee the highest quality in material, dimensions, function and safety.
Original spare parts and accessories can be obtained from your local dealer. He will also have the spare part lists to determine the
required spare part numbers, and will be constantly informed about the latest improvements and spare part innovations.
Please bear in mind that if parts other than original DOLMAR spare parts are used, this will automatically invalidate the DOLMAR
product guarantee.
Guarantee
DOLMAR guarantees the highest quality and will therefore reimburse all costs for repair by replacement of damaged parts resulting
from material or production faults occurring within the guarantee period after purchase. Please note that in some countries particular
guarantee conditions may exist. If you have any questions, please contact your salesman, who is responsible for the guarantee of
the product.
Please note that we cannot accept any responsibility for damage caused by:
• Disregard of the operator’s manual.
• Non-performance of the required maintenance and cleaning.
• Incorrect carburetor adjustment.
• Normal wear and tear.
• Obvious overloading due to permanent exceeding of the upper performance limits.
• Use of guide bars and chains which have not been approved.
• Use of guide bar and chain lengths which have not been approved.
• Use of force, improper use, misuse or accidents.
• Damage from overheating due to dirt on the fan housing.
• Work on the chain saw by unskilled persons or inappropriate repairs.
• Use of unsuitable spare parts or parts which are not original DOLMAR parts, insofar as they have caused the damage.
• Use of unsuitable or old oil.
• Damage related to conditions arising from lease or rent contracts.
• Damages caused by disregarding loose outer bolted connections.
Cleaning, servicing and adjustment work is not covered by the guarantee. All repairs covered by the guarantee must be performed
by a DOLMAR service center.
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Trouble shooting
Malfunction System Observation Cause
Chain does not run Chain brake Engine runs Chain brake actuated.
Engine does not start or Ignition system Ignition spark Malfunction in fuel supply system, com-
only with difculty pression system, mechanical malfunction.
No ignition spark
the wiring,
Fuel supply Fuel tank is lled Combination switch in Choke position,
carburetor defective, suction head dirty, fuel
line bent or interrupted.
Compression Inside Cylinder base packing ring defective, radial
system shaft packings defective, cylinder or piston
rings defective
Outside Spark plug does not seal.
Mechanical Starter does not engage Spring in starter broken, broken parts
malfunction inside the engine.
Warm start difculties Carburetor Fuel tank is lled Wrong carburetor adjustment.
Ignition spark
STOP switch in position, fault or short-circuit in
Spark plug cap or spark plug defective
Engine starts, but Fuel supply Fuel tank is lled Wrong idling adjustment, suction head or
dies immediately carburetor dirty.
Tank venting defective, fuel line interrupted,
cable defective, Combination switch defective
Insufcient power Several systems Engine is idling Air lter dirty, wrong carburetor adjustment,
may be involved mufer clogged, exhaust channel in cylinder
simultaneously clogged, spark arrester screen clogged.
No chain lubrication Oil tank/pump No oil on the chain Oil tank empty.
Oil guide groove dirty.
Oil-pump adjusting screw incorrectly adjusted.
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Extract from the spare parts list
17
24
8
9
7
10
2220
6
5
19
1
2
3
14
18
13
11
12
21
23
4
15
16
26
33
27 28 29 30 31/32
25
Use only original DOLMAR parts. For repairs and
replacement of other parts, see your DOLMAR service center.
PS-351
PS-421
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Extract from the spare parts list
Use only original DOLMAR parts. For repairs and
replacement of other parts, see your DOLMAR service center.
PS-351
PS-421
Pos. DOLMAR-No. Qty. Denomination
1 412 030 661 1
412 035 661 1 Sprocket nose bar 3/8”, 14” (35 cm)
412 040 661 1 Sprocket nose bar 3/8”, 16” (40 cm)
1 412 030 061 1 Sprocket nose bar 3/8”, 12” (30 cm)
412 035 061 1 Sprocket nose bar 3/8”, 14” (35 cm)
412 040 061 1
2 528 092 746 1 Saw chain 3/8“ for 12” (30 cm)
528 092 752 1 Saw chain 3/8“ for 14” (35 cm)
528 092 756 1 Saw chain 3/8“ for 16” (40 cm)
1 414 033 141 1 Sprocket nose bar .325”, 13” (33 cm)
414 038 141 1 Sprocket nose bar .325”, 15” (38 cm)
414 045 141 1 Sprocket nose bar .325”, 18” (45 cm)
2 512 484 756 1 Saw chain .325“ for 13” (33 cm)
512 484 764 1 Saw chain .325“ for 15” (38 cm)
512 484 772 1 Saw chain .325“ for 18” (45 cm)
3 952 010 130 1 Chain protector for 12"-14” (30-35 cm) (3/8”)
952 010 140 1 Chain protector for 16” (40 cm) (3/8”)
952 020 130 1 Chain protector for 13” (33 cm) (.325”)
952 020 140 1 Chain protector for 15”-18” (38-45 cm) (.325”)
4 941 713 160 1 Universal wrench SW 13/16
5 940 827 000 1 Offset screwdriver
6 944 340 001 1 Carburetor screwdriver
7 320 163 447 1 Fuel lter
8 181 114 202 1 Fuel tank cap, cpl.
9 963 229 036 1 O-Ring 29,3 x 3,6 mm
10 195 160 050 1 Return spring pack, complete
11 195 160 030 1 Spring
12 195 160 020 1 Driver
13 195 160 060 1 Starter cable 0,14”x35,4” (3,5x900 mm)
14 965 603 040 1 Spark plug
15 181 114 202 1 Oil tank cap, cpl.
16 963 229 036 1 O-Ring 29,3 x 3,6 mm
17 195 173 150 1 Air lter (eece)
17 195 173 050 1 Air lter (nylon)
18 195 213 101 1 Sprocket guard, cpl.
195 213 150 1 Sprocket guard (with fast tensioner), complete
19 923 208 004 2 Hexagonal nut M8
Sprocket nose bar 3/8”, 12” (30 cm)
Sprocket nose bar 3/8”, 16” (40 cm)
Accessories (not delivered with the chain saw)
25 953 100 090 1 Chain gauge
26 953 004 010 1 File handle
27 953 003 100 1 Round le, dia. 11/64” (4,5 mm)
28 953 003 070 1 Round le, dia. 3/16” (4,8 mm)
29 953 003 090 1 Round le, dia. 5/32” (4,0 mm)
30 953 003 060 1 Flat le
31 953 030 030 1 File holder 3/8“
32 953 030 030 1 File holder .325“
33 950 233 210 1 Tachometer
- 949 000 035 1 Combined can
(for 5l fuel, 2.5l chain oil)
20 181 223 311 1 Clutch drum cpl. .325“, 7-tooth
195 223 311 1 Clutch drum cpl. 3/8“, 6-tooth
21 181 224 081 1 Cup washer
22 927 408 000 1 Circlip
23 195 174 280 1 Spark arrestor screen
24 963 220 013 1 O-Ring 20 x 1,3 mm
45
46
47
The engine exhaust from this product contains chemicals known to the State of California to cause cancer,
birth defects or other reproductive harm.
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DOLMAR POWER PRODUCTS
PO Box 5007
Alpharetta
GA 30005-5007
Specications subject to change without notice
Changements sans préavis
Form: 995 701 380 (7.11 GB )
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