Dolmar PS7300HS-45 User Manual [nl]

Instruction Manual

Original Instruction Manual

Read this instruction manual carefully before putting the chain saw into operation and strictly observe the

Important:

safety regulations!

Keep this instruction manual!

PS-6400, PS-6400 H
PS-7300, PS-7300 H
PS-7900, PS-7900 H

http://www.dolmar.com

1

Thank you for purchasing a DOLMAR
product!

Congratulations on choosing a DOLMAR chain saw! We are conÞ -
dent that you will be satisÞ ed with this modern piece of equipment.
As the world’s oldest manufacturer of chain saws - we got our
start in 1927 - we have the longest experience in the industry. This
experience shows in every detail of every DOLMAR chain saw.

The PS-6400, 7300, 7900 are very handy and robust chain saws
with a new Design.

The automatic chain lubrication with variable-ß ow oil pump
and maintenance-free electronic ignition ensure trouble-free
operation, while the hand-saving anti-vibration system and ergo­nomic grips and controls make work easier, safer, and less tiring
for the user.

DOLMAR chain saws PS-6400, 7300, 7900 are equipped with
the latest safety features and meet all national and international
standards. These features include: hand guards on both handles,
grip throttle lever lock, chain catch, safety saw chain, and chain
brake. The chain brake can be actuated manually, and is also
inertia-actuated automatically in case of kickback.

The following industrial property rights apply: GBM 29616652,
EP 0560201B1.

In order to ensure the proper functioning and performance
of your new chain saw, and to safeguard your own per­sonal safety, it is imperative that you read this instruction
manual thoroughly before operation. Be especially careful
to observe all safety precautions! Failure to observe these
precautions can lead to severe injury or death!

Packing

Your DOLMAR chain saw comes delivered in a protective card­board box to protect against shipping damage.

Cardboard is a basic raw material and is consequently reuseable
or suitable for recycling (waste paper recycling).

Table of contents Page

Packing ................................................................................2

Delivery inventory ..............................................................3

Symbols ...............................................................................3

SAFETY PRECAUTIONS

General precautions .......................................................4

Protective equipment ...................................................... 4

Fuels / Refuelling ............................................................ 5

Putting into operation ......................................................5

Kickback .........................................................................6

Working behavior/Method of working ...........................6-7

Transport and storage .....................................................8

Maintenance ...................................................................8

First aid ........................................................................... 8

Technical data ..................................................................... 9

Denomination of components ........................................... 9

PUTTING INTO OPERATION

Mounting the guide bar and saw chain .................... 10-11

Tightening the saw chain ......................................... 11-12

Chain brake ..................................................................12

Fuels ........................................................................13-14

Refuelling ......................................................................14

Checking the chain lubrication ......................................15

Adjusting the chain lubrication ...................................... 15

Starting the engine ........................................................ 16

Cold start .......................................................................16

Warm start .................................................................... 16

Stopping the engine ......................................................16

Checking the chain brake .............................................16

Adjusting the carburetor ................................................. 17

Working in summer / winter ............................................18

Handle heating (only PS-6400 H, 7300 H, 7900 H) .....18

MAINTENANCE

Sharpening the saw chain .......................................19-20

Cleaning the brake band and sprocket interior ............. 21

Cleaning the guide bar ................................................. 22

Replacing the saw chain ...............................................22

Replacing the suction head .........................................22

Cleaning the air Þ lter and the Þ lter hood ....................... 23

Replacing the spark plug ..............................................24

Checking the ignition spark ........................................... 24

Checking the mufß er screws ......................................... 24

Replacing the starter cable / Replacing the return spring 25

Mounting the fan housing .............................................26

Cleaning the cylinder area ............................................ 26

Replacing/cleaning the spark arrester screen ..............26

Instructions for periodic maintenance ........................... 27

Service, spare parts and guarantee ........................... 27-28

Trouble shooting .............................................................. 28

Extract from spare parts list ........................................... 29

Accessories ..................................................................29

EU conformity declaration ............................................... 30

2

Delivery inventory

32

4

1. Chain saw

2. Guide bar

3. Saw chain

4. Chain protection cover

5. Universal wrench

6. Offset screwdriver

7. Screwdriver for carburetor adjustment

8. Cylinder Þ n cleaner

9. Instruction manual (not shown)

Symbols

You will notice the following symbols on the saw and in the Instruction Manual:

5 6 7

1

In case one of the parts listed should not be included in the
delivery inventory, please consult your sales agent.

8

STOP

Read instruction manual and
follow the warning- and safety
precautions!

Particular care and caution!

Forbidden!

Wear protective helmet, eye and
ear protection!

Wear protective gloves!

No smoking!

No open Þ re!

Stop engine!

Start engine

Off switch

Caution, kickback!

Chain brake

Fuel and oil mixture

Working in summer / winter

Carburetor adjustment

Chain oil Þ ll/oil pump

Saw chain oil
adjustment screw

First aid

Recycling

CE - Marking

3

SAFETY PRECAUTIONS

Intended use
Power chain saws

This power chain saw may be used only for sawing wood out
of doors. It is intended for the followung uses depending on its
class:

- Professional and mid-class: Use on small, medium and large

trees: felling, limb removal, cutting to length, thinning.

- Hobbyklasse: Occasional use on small trees, fruit-tree care,

felling, limb removal, cutting to length.

Unauthorised users:

Persons who are not familiar with the Instruction Manual, children,
young people, and persons under the inß uence of drugs, alcohol
or medication must not use this saw.

National regulations may restrict the use of the unit!

General precautions

- To ensure correct operation the user has to read this instruc­tion manual to make himself familiar with the charac teristics

of the chain saw. Users insufÞ ciently informed will endanger
themselves as well as others due to improper handling.

- It is recommended to lend the chain saw only to people who
are experienced in working with chain saws. Always hand over
the instruction manual.

- First users should ask the dealer for basic instructions to be­come familiarized with the characteristics of engine powered
sawing or even attend a recognized course of instruction.

- Children and young persons aged under 18 years must not
be allowed to operate the chain saw. Persons over the age of
16 years may, however, use the chain saw for the purpose of
being trained as long as they are under the supervision of a
qualiÞ ed trainer.

- Use chain saws always with the utmost care and attention.

- Operate the chain saw only if you are in good physical condition.
If you are tired, your attention will be reduced. Be especially
careful at the end of a working day. Perform all work calmly
and carefully. The user has to accept liability for others.

- Never use the chain saw after having consumed alcohol, drugs
or medication.

- A Þ re extinguisher must be available in the immediate vicinity
when working in easily inß ammable vegetation or when it has
not rained for a long time (danger of Þ re).

Protective equipment

- In order to avoid head, eye, hand or foot injuries as well
as to protect your hearing the following protective equip­ment must be used during operation of the chain saw:

- The kind of clothing should be appropriate, i. e. it should be
tight-Þ tting but not be a hindrance. Do not wear jewellery
or clothing which could become entangled with bushes or
shrubs. If you have long hair, always wear a hairnet!

- It is necessary to wear a protective helmet whenever working
with the chain saw. The protective helmet (1) is to be checked
in regular intervals for damage and is to be replaced after 5
years at the latest. Use only approved protective helmets.

- The face shield (2) of the protective helmet (or the goggles)
protects against sawdust and wood chips. During operation of
the chain saw always wear a goggle or a face shield to prevent
eye injuries.

- Wear adequate noise protection equipment (ear muffs (3),
ear plugs, etc.). Octave brand analysis upon request.

- The safety jacket (4) is provided with special signal-coloured
shoulder straps and is comfortable and easy to care for.

- The protective brace and bib overall (5) is made of a nylon
fabric with 22 layers and protects against cuts. We strongly
recommend its use.

4

- Protective gloves (6) made of thick leather are part of the

prescribed equipment and must always be worn during
operation of the chain saw.

- During operation of the chain saw safety shoes or safety
boots (7) Þ tted with anti skid sole, steel toe caps and pro-
tection for the leg must always to be worn. Safety shoes
equipped with a protective layer provide protection against
cuts and ensure a secure footing.

1

2

1

3

2

3

4

7

5

4

6

Fuels / Refuelling

- Stop the engine before refuelling the chain saw.

- Do not smoke or work near open Þ res (5).

- Let the engine cool down before refuelling.

- Fuels can contain substances similar to solvents. Eyes and skin
should not come in contact with mineral oil products. Always wear
protective gloves when refuelling. Frequently clean and change
protective clothes. Do not breathe in fuel vapors. Inhalation of fuel
vapours can be hazardous to your health.

- Do not spill fuel or chain oil. When you have spilt fuel or oil im­mediately clean the chain saw. Fuel should not come in contact
with clothes. If your clothes have come in contact with fuel, change
them ot once.

- Ensure that no fuel or chain oil oozes into the soil (environmental
protection). Use an appropriate base.

- Refuelling is not allowed in closed rooms. Fuel vapors will ac­cumulate near the ß oor (explosion hazard).

- Ensure to Þ rmly tighten the screw plugs of the fuel and oil
tanks.

- Change the place before starting the engine (at least 3 m from
the place of refuelling) (6).

- Fuel cannot be stored for an unlimited period of time. Buy only as
much as will be consumed in the near future.

- Use only approved and marked containers for the transport and
storage of fuel and chain oil. Ensure children have no access to
fuel or chain oil.

Putting into operation

- Do not work on your own. Another person must be nearby
in case of emergencies (within shouting distance).

- Ensure that there are no children or other people within the working
area. Pay attention to any animals in the working area, as well (7).

- Before starting work the chain saw must be checked for

perfect function and operating safety according to the
prescriptions.

Check especially the function of the chain brake, the correct mount-

ing of the guide bar, the correct sharpening and tightening of the
chain, the Þ rm mounting of the sprocket guard, the easy motion
of the throttle lever and the function of the throttle lever lock, the
cleanliness and dryness of the handles, and the function of the
ON/OFF switch.

- Put the chain saw only into operation if it is completely assembled.
Never use the chain saw when it is not completely assembled.

- Before starting the chain saw ensure that you have a safe
footing.

- Put the chain saw into operation only as described in this instruc­tion manual (8). Other starting methods are not allowed.

- When starting the chain saw it must be well supported and se­curely held. The guide bar and chain must not be in contact with
any object.

- When working with the chain saw always hold it with both
hands. Take the back handle with the right hand and the tubular
handle with the left hand. Hold the handles tightly with your thumbs
facing your Þ ngers.

- CAUTION: When releasing the throttle lever the chain will
keep on running for a short period of time (free-wheeling).

- Continuously ensure that you have a safe footing.

- Hold the chain saw such that you will not breathe in the exhaust
gas. Do not work in closed rooms (danger of poisoning).

- Switch off the chain saw immediately if you observe any

changes in its operating behavior.

- The engine must be switched off before checking the chain
tension, tightening the chain, replacing it or clearing malfunc­tions (9).

- When the sawing device is hit by stones, nails or other hard
objects, switch off the engine immediately and check the
sawing device.

- When stopping work or leaving the working place switch off the
chain saw (9) and put it down such that nobody is endangered.

- Do not put the overheated power chain saw in dry grass or on any
inß ammable objects. The mufß er is very hot (danger of Þ re).

- CAUTION: Oil dropping from the chain or guide bar after having
stopped the saw chain will pollute the soil. Always use an appro­priate base.

5

3 meters

6

7

8

● Maintenance ● Stopping work

● Refuelling ● Transport

● Sharpening the chain ● Putting out of function

9

5

Kickback

- When working with the chain saw dangerous kickbacks may
occur.

- Kickback occurs when the upper part of the end of the guide
bar inadvertently touches wood or other hard objects (10).

- This causes the saw to be thrown back toward the user with
great force and out of control. Risk of injury!

In order to prevent kickback, follow these rules:

- Only specially-trained persons should perform plunge cuts, i.e.,
piercing timber or wood with the tip of the saw!

- Never apply the end of the bar when starting to make a cut.

- Always observe the end of the guide bar. Be careful when
continuing an already started cut.

- When starting to cut the chain must be running.

- Ensure that the chain is always sharpened correctly. Pay special
attention to the height of the depth limiter.

- Never cut several branches at the same time. When cutting a
branch ensure that no other branch is touched.

- When crosscutting a trunk be aware of the trunks next to it.

Working behavior/Method of working

- Only use the chain saw during good light and visibility periods.
Be aware of slippery or wet areas, and of ice and snow (risk of
slipping). The risk of slipping is extremely high when working
on recently peeled wood (bark).

- Never work on unstable surfaces. Make sure that there are no
obstacles in the working area, risk of stumbling. Always ensure
that you have a safe footing.

- Never saw above your shoulder height (11).

- Never saw while standing on a ladder (11).

- Never climb up into trees to perform sawing with the chain
saw.

- Do not work leaning too far over.

- Guide the chain saw in such a way that no part of your body is
within the elongated swivelling range of the saw (12).

- Use the chain saw for sawing wood only.

- Avoid touching the ground with the chain saw while it is still
running.

- Never use the chain saw for lifting up or removing pieces of
wood or other objects.

- Remove foreign objects such as sand, stones and nails found
within the working area. Foreign objects may damage the saw­ing device and can cause dangerous kickback.

- When sawing precut timber use a safe support (sawing jack,

13). Do not steady the workpiece with your foot, and do not
allow anyone else to hold or steady it.

- Secure round pieces against rotation.

- For cutting down trees or performing crosscuts the spike
bar (13, Z) must be applied to the wood to be cut.

- Before performing a crosscut Þ rmly apply the spike bar to the
timber, only then can the timber be cut with the chain running.
For this the chain saw is lifted at the back handle and guided
with the tubular handle. The spike bar serves as a centre of
rotation. Continue by slightly pressing down the tubular handle
and simultaneously pulling back the chain saw. Apply the spike
bar a little bit deeper and once again lift the back handle.

- When the timber must be pierced for cutting or longitudi-

nal cuts are to be performed it is urgently recommended
to have this carried out by specially trained persons only

(high risk of kickback).

- Do longitudinal - lengthwise - cuts at the lowest possible
angle (14). Be very careful when doing this type of cut, as the
spike bar cannot grip.

- The saw must be running whenever you remove the chain saw
from the wood.

- When performing several cuts the throttle lever must be released
in between.

6

10

11

12

13

14

- Be careful when cutting splintery wood. Cut pieces of wood
may be pulled along (risk of injuries).

- When cutting with the upper edge of the guide bar, the chain
saw may be pushed in the direction of the user if the chain
gets clamped. For this reason use the lower edge of the bar
whenever possible. The chain saw will then be pushed away
from you (15).

- If the timber is under tension (16), Þ rst cut the pressure side
(A). Then the crosscut can be performed on the tension side
(B). Thus clamping of the guide bar can be avoided.

CAUTION:
People felling trees or cutting of branches must be specially

trained. High risk of injuries!

- When cutting of branches, the chain saw should be supported
on the trunk. Do not use the end of the bar for cutting (risk of
kickback).

- Be aware of branches under tension. Do not cut free branches
from below.

- Never perform detensioning cuts while standing on the trunk.

- Before cutting down a tree ensure that

a) only those people are within the working area which are

actually involved in cutting down the tree.

b) every worker involved can withdraw without stumbling (the

people should withdraw backwards in a diagonal line, i. e.
at a degree of 45°).

c) the bottom part of the trunk is free from foreign objects,

underbrush and branches. Make sure to have a safe footing
(risk of stumbling).

d) the next working place is at least 2 1/2 tree lengths away

(17). Before cutting down the tree check the direction of fall
and make sure that there are neither people nor objects
within a distance of 2 1/2 tree lengths.

- Judging the tree:

Direction of hanging - loose or dry branches - height of the tree

- natural overhang - is the tree rotten?

- Take into account the direction and speed of the wind. If strong
gusts are occurring, do not do any felling.

- Cutting the roots:

Start with the strongest root. First do the vertical and then the

horizontal cut.

- Notching the trunk (18, A):

The notch determines the direction of fall and guides the tree.

The trunk is notched perpendicular to the direction of fall and
penetrates 1/3 -1/5 of the trunk diameter. Perform the cut near
the ground.

- When correcting the cut, always do so over the whole width of
the notch.

- Cut down the tree (19, B) above the bottom edge of the notch
(D). The cut must be exactly horizontal. The distance between
both cuts must be approx. 1/10 of the trunk diameter.

- The material between both cuts (C) serves as a hinge. Never
cut it through, otherwise the tree will fall without any control.
Insert felling wedges in time.

- Secure the cut only with wedges made of plastic or aluminium.
Do not use iron wedges. If the saw hits an iron wedge the chain
can be seriously damaged or torn.

- When cutting down a tree always stay sidewards of the falling
tree.

- When withdrawing after having performed the cut, be alert for
falling branches.

- When working on sloping ground the user of the chain saw
must stay above or sidewards of the trunk to be cut or the tree
already cut down.

- Be alert for trunks which may roll towards you.

15

16

o

45

2 1/2

o

45

17

= cutting down area

18

19

7

Transport and storage

- When changing your location during work switch off the chain
saw and actuate the chain brake in order to prevent an inadvert­ent start of the chain.

- Never carry or transport the chain saw with the chain running.

- When transporting the chain saw over long distances the guide
bar protection cover (delivered with the chain saw) must be
applied.

- Carry the chain saw with the tubular handle. The guide bar
points backwards (20). Avoid coming in contact with the mufß er
(danger of burns).

- Ensure safe positioning of the chain saw during car trans portation
to avoid fuel or chain oil leakage.

- Store the chain saw safely in a dry place. It must not be stored
outdoors. Keep the chain saw away from children.

- Before storing the chain saw over a long period of time or ship­ping it the fuel and oil tanks must be completely emptied.

Maintenance

- Before performing maintenance work switch off the chain
saw (21) and pull out the plug cap.

- Before starting work always check the operating safety of
the chain saw, in particular the function of the chain brake.
Make sure that the chain is always sharpened and tightened
correctly (22).

- Operate the chain saw only at a low noise and emission level.
For this ensure the carburetor is adjusted correctly.

- Regularly clean the chain saw.

- Regularly check the tank cap for tightness.

Observe the accident prevention instructions issued by trade

associations and insurance companies. Do not perform any
modiÞ cations on the chain saw. You will put your safety at
risk.

Perform only the maintenance and repair works described in

the instruction manual. All other work must be carried out by
DOLMAR Service.

Use only original DOLMAR spare parts and accessories.
Using spare parts other than original DOLMAR parts or acce-

sories and guide bar/chain combinations or lengths which are
not approved bring a high risk of accidents. We cannot accept
any responsibility for accidents and damage resulting from using
sawing devices or accesories which have not been approved.

20

21

22

First aid

For the event of a possible accident, please make sure that a

Þ rst aid kit is always immediately available close by. Immediately
replace any items used from the Þ rst aid box.

When calling for help, give the following information:

- Place of the accident

- What happened

- Number of injured people

- Kind of injuries

- Your name!

NOTE

Individuals with poor circulation who are exposed to excessive
vibration may experience injury to blood vessels or the nervous
system.

Vibration may cause the following symptoms to occur in the Þ ngers,
hands or wrists: ”Falling asleep” (numbness), tingling, pain, stabbing
sensation, alteration of skin colour or of the skin. If any of these

symptoms occur, see a physician!
To reduce the risk of vibration white Þ nger, keep your hands

warm, wear gloves, and make sure the saw chain is sharp.

8

SERVICE

23

24

Technical data

-

Stroke volume cm

PS-6400 PS-7300 PS-7900

3

64 72.6 78.5
Bore mm 47 50 52
Stroke mm 37 37 37
Max. power at speed kW / 1/min 3.5 / 9,000 4.2 / 9,500 4.6 / 9,500
Max. torque at speed Nm / 1/min 4.2 / 6,500 4.8 / 7,000 5.2 / 7,000
Idling speed / max. engine speed with bar and chain 1/min 2,500 / 13,500 2,500 / 13,500 2,500 / 13,500
Clutch engagement speed 1/min 3,200 3,200 3,200
Sound pressure level at the workplace L
Sound power level L
Vibration acceleration a

- Tubular handle m/s

WA, Fl + Ra

hv, eq

per ISO22868

per ISO 22867

per ISO22868

pA, eq

2) 4)

dB(A) 115,3 / KWA = 2,5 115,3 / KWA = 2,5 115,3 / KWA = 2,5

1) 4)

- Rear handle m/s

1) 4)

dB(A) 105,1 / KpA = 2,5 105,1 / KpA = 2,5 105,1 / KpA = 2,5

2

2

5.9 / K=2 6.2 / K=2 6.6 / K=2

3.6 / K=2 4.1 / K=2 4.5 / K=2
Carburetor (diaphragm carburetor) Type ZAMA
Ignition system Type electronic
Spark plug Type NGK BPMR 7A
Electrode gap mm 0.5
or spark plug Type BOSCH WSR 6F
Fuel consumption at max. load per ISO 7293 kg/h 1.72 2.33 2.3
SpeciÞ c consumption at max. load per ISO 7293 g/kWh 500 510 505
Fuel tank capacity l 0.75
Chain oil tank capacity I 0.42
Mixture ratio (fuel/two-stroke oil)

- when using DOLMAR oil 50 : 1 / 100:1 (HP 100)

- when using Aspen Alkylat (two-stroke fuel) 50 : 1 (2%)

- when using other oils 50 : 1 (quality grade: JASO FC or ISO EGD)
Chain brake
Chain speed

3)

m/s 26.3 27.7 27.7

engages manually or in case of kickback

Sprocket pitch inch 3/8
Number of teeth Z 7
Chain type see the Extract from the spare-parts list 099
Pitch / gauge inch 3/8 / .058
Guide bar, length of a cut cm 38 / 45 / 50 / 60 / 70
Guide-bar type see the Extract from the spare-parts list
Weight (fuel tank empty, without chain and guide bar) kg 6,4 / 6,6

1)

Figures derived in equal part from idling, full-load and top-speed.

2)

Figures derived in equal part from full-load and top-speed.

3)

At top-speed.

4)

Uncertainty (K=).

5)

With handle heating.

Denomination of components

5)

6,5 / 6,7

5)

6,5 / 6,7

4

2

1

3

1 Handle
2 Filter hood
3 Filter hood clip
4 Tubular handle
5 Hand guard (release for chain brake)
6 Mufß er

7 Spike bar
8 Chain tensioning screw
9 Retaining nuts
10 Chain catch
11 Sprocket guard
12 IdentiÞ cation plate
13 Starting valve (option)
14 Starter grip
15 Adjusting screws for carburetor
16 I/STOP-switch

IdentiÞ cation plate (12)
Indicate when ordering spare parts

DOLMAR PS-7900

2009 123456

DOLMAR GmbH, 22045 Hamburg, Germany

038.100.010

Typ 038

Serial number
Year of manufacture

12

24 25

27 10

13

1126

14 15

16 17

17 Choke switch and half-throttle lock
18 Throttle lever
19 Safety locking button
20 Rear hand guard
21 Fuel tank cap

23

18 19

22 Fan housing with starting assembly
23 Oil tank cap
24 Guide bar

25 Chain
26 Adjusting screw for oil pump (bottom side)
27 Switch for handle heating (only PS-6400 H, 7300 H, 7900 H)

202122

12 Grip heater switch (option)

5)

5

6

7

8

9

9

PUTTING INTO OPERATION

CAUTION:

Before doing any work on the guide bar or chain, always

STOP

A

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

1

steps for mounting the guide bar and saw chain:

2

Release the chain brake by pulling the hand guard (1) in direc­tion of arrow.

Unscrew retaining nuts (2).
Pull off the sprocket guard (3).

B

C

5

6

D

10

45

7

3

Position the guide bar (4) and push against the sprocket (5)
as shown by the arrow.

Lift the chain (6) over the sprocket (5). Using your right hand, guide
the chain into the top guide groove on the guide bar (7).

CAUTION:

Note that the cutting edges along the top of the chain must
point in the direction of the arrow!

Pull the chain (6) around the sprocket nose (8) of the guide
bar in the direction of the arrow.

Guide the chain over the chain catch (9).
Pull the guide bar as shown by the arrow to take the slack

out of the chain, so that it comes up to the bottom edge of the
guide bar (10).

6 8

E

Line up the holes in the sprocket guard (3) with the bolts (11).
Turn the chain tensioning screw (H/13) until the chain

tensioning bolt (12) is aligned with the hole in the guide bar.
Replace the sprocket guard.
Manually tighten the retaining nuts (H/2).

Tightening the saw chain

Slightly lift the end of the guide bar and turn the chain adjusting
screw (13) 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.

9 10

F

11

3

12

G

2

13

H

11

STOP

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.

2

Raise the tip of the guide bar a little and turn the chain tensioning
screw (13) 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.

A

13

Chain brake

The PS-6400, 7300, 7900 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 sufÞ ciently 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!

B

12

1

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.

C

12

Fuel
CAUTION:

This saw is powered by mineral-oil products (gasoline and
oil).
Be especially careful when handling gasoline.
Avoid all ß ame or Þ re. Do not smoke (explosion hazard).

Fuel mixture

This tool is powered by a high-performance air-cooled two­stroke 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 ROZ. 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 EGD), which
has to be added to the fuel. The engine has been designed for
use of DOLMAR HP 100 high-performance two-stroke engine oil
and a mixture ratio of only 100:1 to protect the environment. In
addition, a long service life and reliable operation with a minimum
emission of exhaust gases are ensured.

DOLMAR HP 100 high-performance two-stroke engine oil is avail­able in the following sizes:

DOLMAR high-performance two-stroke engine oil is available in
the following sizes to suit your individual requirements:

In case DOLMAR high-performance two-stroke engine oil is not
available, it is urgently recommended to use a mixture ratio of 50:1
with other two-stroke engine oils, as otherwise optimum operation
of the engine cannot be guaranteed.

Caution: Do not use ready-mixed fuel from petrol sta-

The correct mixture ratio:
50:1 when using DOLMAR high-performance two-stroke engine

100:1 when using DOLMAR HP 100 high-performance two-stroke

50:1 when using other synthetic two-stroke engine oils

NOTE: For preparing the fuel-oil mixture Þ rst mix the entire oil

quantity with half of the fuel required, then add the remaining
fuel. Thoroughly shake the mixture before Þ lling it into the chain
saw tank.

0,5 l order number 980 008 109

1 l order number 980 008 107
100 ml order number 980 008 106

tions.

oil, i. e. mix 50 parts gasoline with 1 part oil.

engine oil, i. e. mix 100 parts gasoline with 1 part oil.

(quality grade JASO FC or ISO EGD), i. e. mix 50 parts
gasoline with 1 part oil.

Gasoline

1000 cm3 (1 litre) 20 cm3 20 cm3 10 cm
5000 cm3 (5 litres) 100 cm3 100 cm3 50 cm
10000 cm3 (10 litres) 200 cm3 200 cm3 100 cm

It is not wise to add more engine oil than speciÞ ed
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 mufß er. In ad-
dition, fuel consumption will rise and performance
will decrease.

+

50:1

OIL

50:1

DOLMAR

50:1

OIL

100:1

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.

Store fuel only in proper containers, in dry, cool,
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!

3

3

3

D

Chain oil

Use an oil with adhesive additive for lubricating the chain and
guide bar. The adhesive additive prevents the oil from being
ß 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).

E

13

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 ß ush out all remain-
ing 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 dam-

waste oil

A

age to the oil pump or other parts.
The next time you use the saw, Þ ll the tank with BIOTOP

chain oil again.
oil or unappropriate chain oil the product guarantee will be
null and void.

Your salesman will inform you about the use of chain oil.

In case of damage caused by using waste

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!

Refuelling

STOP

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 cap and Þ ll the tank with fuel (fuel/oil mixture)
or chain oil as the case may be. Fill up to the bottom edge
of the Þ ller neck. Be careful not to spill fuel or chain oil!

Tightly screw on the cap.

Clean screw cap and tank after refuelling.

chain oil fuel/oil mixture

B

14

Lubricating the chain

During operation there must always be sufÞ cient chain oil in
the chain-oil tank to provide good chain lubrication. One Þ lling
is sufÞ cient for about one half-hour of continuous operation.
While working make sure there is enough chain oil in the tank.
If necessary, add oil. The engine must be switched off!

Checking the chain lubrication

Never work with the chain saw withoute sufÞ cient chain lubri -
ca tion. 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. 15 cm above a trunk or the

ground (use an appropriate base).
If the lubrication is sufÞ cient, you will see a light oil trace be-

cause oil will be ß 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

C

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.
To change the feed quantity use the screwdriver and adjust the

adjusting screw in the following way:

• Turn to the right to reduce the feed rate.

• Turn to the left to increase the feed rate.
Even very small adjustments to the adjusting screw (1) can

inß uence the oil ß ow rate. 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.

STOP

2 3

Adjustment
range 70°

1

D

E

15

Starting the engine

Start the chain saw only after having assembled it com­pletely and inspected.

Move at least 3m away from the place where you fuelled the
saw.

Make sure you have a good footing, and place the saw on the
ground in such a way that the chain is not touching anything.

Engage the chain brake (lock).
Hold the tubular handle tightly with one hand and press the

chain saw to the ground.

A

132 4

Steady the rear handle by standing in the hand guard.

Cold-starting:

Pull the choke (1) out until it audibly clicks. This simultaneously
actuates the half-throttle lock.

Move the I/STOP ignition switch (3) as shown by the arrow.
Slowly pull out the starter cable until you notice resistance (the

piston is positioned before the top dead centre).
Push the starting valve (2) (option).

Now pull the starter cable with a fast and forceful movement
until you hear the Þ rst ignition.

CAUTION: Do not pull out the starter cable more than approx.

50 cm, and lead it back by hand.
Push the starting valve (2) (option).
Depress the choke (1) and pull the starter cable again. As

soon as the engine is running, grasp the rear handle (this actuates
the grip safety (5)) and tap the throttle (6). This will release the
half-throttle lock and the engine will run in idle.

CAUTION: As soon as the engine is started it must be put
in idle to prevent the chain brake from being damaged.

Now release the chain brake.

Warm starting:

As described for cold starting, except before starting pull the
choke (1) all the way out and back in one time, in order to ac­tivate the half-throttle lock.

6 5

B

Stopping the engine

Move the I/STOP ignition switch to
the “STOP” position.

Checking the chain brake

Do not work with the chain saw without Þ rst checking the
chain brake!

Start the engine as described (make sure you have a good
footing, and place the chain saw on the ground in such a way

7

that the guide bar is free of contact).
Grasp the tubular handle Þ rmly with one hand and hold the grip

with the other.
With the engine running at moderate speed, press the

hand guard (7) in the direction of the arrow with the back of
your hand until the chain brake engages. The chain should
stop immediately.

Immediately release the throttle and release the chain brake.

IMPORTANT: If the chain does not stop immediately when
you test the chain brake, do NOT use the chain saw. Take
the chain saw to a DOLMAR service center.

C

16

Adjusting the carburetor

CAUTION: Carburetor adjustment may only be done by a
specialist DOLMAR service centre!

SERVICE

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 Þ lter and properly in-
stalled guide bar and chain.

Use a screwdriver (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.

S

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 centre!

D

17

Working in winter

In order to prevent carburetor icing in conditions of low tempe­rature combined with high humidity, and below + 5°C in order
to get up to operating temperature faster, heated air can be
taken from the cylinder.

Remove the Þ lter hood (see „Cleaning air Þ lter“)
Remove the insert (10) and insert it as shown in position B for

cold-weather operation.
At temperatures above + 5°C the carburetor must NOT be fed

heated air. Failure to follow these instructions can lead to
damage to the cylinder and piston!

At temperatures over +5°C place the insert in position A for
normal operation.

Position A

Position B
Reinstall the Þ lter hood.

Handle heating

(only PS-6400 H, PS-7300 H, PS-7900 H)
The electrically heated handles are activated by pushing the

switch (11).

On: red marking on switch visiable
Off: red marking on switch not visiable

- Normal operation

- Cold-weather operation

BA

10

E

11

F

18

A

B

min.

3 mm (0.11”)

0.64 mm

(.025“)

0.64 mm

(.025“)

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 ß 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 Þ le will be enough.
Have the chain resharpened at a service centre 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: 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

0.64 mm (.025“).

CAUTION: Excessive depth
increases the risk of kickback!

STOP

The sharpening angle of 25° must be identical for all cutters!
Different angles result in a roughly, irregularly running chain,
increase wear and tear and cause chain beakage.

The front rake 60° of the cutter results from the cut depth of
the round Þ le. If the proper Þ le is used in the right manner, the
correct front rake will be obtained automatically.

C

19

Files and how to work with them

Sharpen using a special Þ le holder with a saw chain round
Þ le. Normal round Þ les are not appropriate for this work. See

„Accessories“ for the order number.
File the Þ rst cutter half with a 5.5 mm dia. round saw-chain

Þ le, then switch to a 4.8 mm dia. Þ le.
The Þ le should cut only when pushed forwards (arrow). Lift the

Þ 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 Þ led to the exact same shape as the

used teeth, including on their running surfaces.
Always guide the Þ le horizontally (10

The Þ le holder makes Þ le guidance easier. It is marked for the
correct sharpening angle of 25° (keep the marks parallel with
the chain when Þ ling, see illustration) and limits the cut depth
to the correct 4/5 of the Þ le diameter. See „Accessories“ for the
order number.

°

to the guide bar).

D

4/5

25°

E

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 ß at
Þ le (1). See „Accessories“ for the order number.

Round off the front of the depth limiter (2).

20

1 2

F

Cleaning the brake band and sprocket interior

6 7

A

STOP

4

5

2 3

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“ Þ gs. B) and clean the interior with a brush

Remove the chain (3) and guide bar (2).
Unscrew screw (4) and remove the guide plate (5).
Unscrew screw (6) and remove the brake mechanism cover (7).

1

Clean the guide plate (5) and brake mechanism cover (7).
Use a brush to clean the interior, especially the brake mecha-

8

nism (11).
Make sure to leave no residue in the oil guide groove (10)

NOTE:

The brake mechanism cover (7) holds the lever (8) in place.
Before putting the cover back on, check the lever for proper
positioning.

First put on the brake mechanism cover (7) and then the guide
plate (5).

1011

For replacing the guide bar, chain, and sprocket see „PUTTING
INTO OPERATION A-H“.

After assembly, always check the functioning of the chain
brake (see “Checking the chain brake”)

7

5

NOTE:
The chain brake is a very important safety device and like

SERVICE

B

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
centre.

21

Cleaning the guide bar

CAUTION: Protective gloves must be worn.

Regularly inspect the bearing surfaces of the guide bar for
damage, and clean them with a suitable tool.

Replacing the saw chain

CAUTION: Use only chains and guide bars designed for
this saw (see the Extract from the spare-parts list)!

Check the sprocket before mounting a new chain.
Worn out sprockets (12) may damage the new chain and must

therefore be replaced.
Remove the sprocket guard (1) (See „PUTTING INTO OPE-

RATION“ Þ gs. B).
Remove the chain and guide bar.
Remove circlip (13).
CAREFUL: The circlip will jump out of the groove unless you

hold it down with your thumb while removing it.
Remove cup-disc (15).
Replace the old sprocket (12) with a new one (16). For the part

number consult the “Extract from the spare parts list”.
Assemble the new sprocket, cup-disc and circlip.
For replacing the guide bar, chain, and sprocket see „PUTTING

INTO OPERATION A-H“.

NOTE:

New chains stretch, so check the chain tension frequently (see
“Checking the chain tension”).

C

12

15

13

Replacing the suction head

The felt Þ lter (17) 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 ß ow to the
carburetor.

To remove the suction head for replacement, pull it out through
the tank Þ ller neck using a piece of wire bent at one end to
form a hook.

22

16

D

17

E

5

Cleaning the air Þ lter

4

3

1

CAUTION: To prevent eye injury, always wear eye protection
when cleaning the Þ lter with compressed air!

Do not use fuel to clean the air Þ lter.

Unhook the Þ lter hood clips (1) with the combination tool and
remove the Þ lter hood (2).

Pull out the choke (3) to prevent dirt particles from getting into
the carburetor.

Unhook the air Þ lter retainer (4) by pressing in the direction
shown by the arrow.

Pull the air Þ lter (5) up and out.

IMPORTANT: Cover the intake opening with a clean cloth to

2

2a

5 4

3

prevent dirt particles from getting into the carburetor.

Choosing the right Þ lter: The ß eece Þ lter is for use in dry or dusty
conditions. The nylon Þ lter is for use in damp conditions.

Pry apart the top and bottom of the air Þ lter as shown in
Figure.

Cleaning the ß eece Þ lter: Carefully tap out dust or carefully
blow out dust from the inside with compressed air. Do not
brush the ß eece, as this will force dirt particles into the fabric.
If the Þ lter is very dirty, it can be washed in lukewarm water
with regular dishwashing detergent. Note that the ß eece Þ lter
does not need to be cleaned until there is a noticeable loss of
power. If cleaning the Þ lter does not bring an improvement in
performance, it is time to replace it.

Cleaning the nylon Þ lter, the nylon Þ lter

Use a soft brush or blow out dirt from the inside with compressed
air. If the Þ 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 Þ lter!

Note on the pre-Þ lter: The ventilation slots (2a) can be covered
by an additional self-adhesive nylon pre-Þ lter. Before putting
on this Þ lter, clean the area where it will go. This pre-Þ lter is
available as an accessory part.

Let the air Þ lter dry completely.
Put the top and bottom sections back together.
Before assembling the air Þ lter, check the choke ß ap for any dirt

particles. If there are any, remove them with a brush.

CAUTION: If the air Þ lter becomes damaged, replace imme-
diately! Pieces of cloth or large dirt particles can destroy
the engine!

STOP

in the Þ lter hood:

Put in the air Þ lter (5) and press down the air Þ lter retainer (4)
evenly with thumb and foreÞ nger until it clicks.

Push in the choke (3) and push the throttle all the way in to
deactivate the half-throttle lock.

Put on the Þ lter hood (2) and hook in the clips (1).

A

23

Replacing the spark plug

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 Þ lter cover
Pull the plug cap (6) 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 0.5 mm.

(see „Cleaning the air Þ lter“).

STOP

Checking the ignition spark

Stick the combination tool (7) between the hood and cylinder
exactly as shown.

IMPORTANT! Do not stick the tool in the spark plug hole.
It should touch only the cylinder (otherwise the engine will

be damaged!).

With the spark-plug cap Þ rmly attached to the unscrewed spark
plug (8), use insulated pliers to hold the plug against the tool
(away from the spark-plug hole!).

Switch the I/STOP ignition switch (9) as shown by the arrow.
Pull the starter cable hard.
If the function is correct, an ignition spark must be visible near

the electrodes.
CAUTION: Use only the following spark plugs: NGK BPMR 7A

or BOSCH WSR 6F.

6

0,5 mm

B

7

8

9

C

Checking the mufß er screws

STOP

Careful!
Do not tighten the mufß er screws when the engine is hot!

Check the mufß er screws (10) for tightness. If they are loose,
hand-tighten them. Important - do not overtighten!

24

10

D

Replacing the starter cable /

STOP

1

8

7

5

6

2

10

9

3
4

Replacing the return spring

Unscrew three screws (1).
Remove fan housing (2).

NOTE: The screws (1) are secured against falling out of the
housing.

CAREFUL! Injury hazard! Do not unscrew screw (5) 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 Þ rst de-tension the cable drum return
spring (3).
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 (4).
Carefully let the drum turn until the return spring is no longer
under tension.
Unscrew screw (5) and remove washer (6). Carefully remove
the cable drum.

CAREFUL! Injury hazard! The return spring can pop out!

Remove any cable pieces.
Thread a new cable (dia. 3.5 mm, length 980 mm) as shown

in the illustration (don’t forget the washer (8)) and knot both
ends as shown.

Pull knot (9) into the cable drum (3).
Pull knot (10) into the starter grip (7).
Put the drum on its spindle and turn it slightly until the return

spring engages.
Screw in and tighten screw (5) and washer (6).
Guide the cable into the space (4) on the drum and use the

cable to turn the drum two turns clockwise.
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 three or four times. The starter grip should now be held

upright 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.

11

Replacing the return spring

Disassemble the fan housing and cable drum (see above).

CAUTION: Danger of injury! If the spring is broken it may
pop out!

Replacement return springs are supplied pretensioned in the
cable drum. CAUTION – the spring can pop out. If it does, it
can be put back in as shown in the drawing.

Before installation in the fan housing, lightly grease the new
return spring (11) with multipurpose grease (order no. 944 360

000).
Install the cable drum and fan housing (see above).

A

25

Mounting the fan housing

Put the fan housing (13) on.
Press the screws (14) into their holes.
Lift the engine hood (15) slightly and use your thumb to hook

in the tab (16) on the fan housing.
Straighten out the fan housing, push lightly against the saw and

pull the starter grip until the starting mechanism catches.
Tighten screws (14).

15

16

13

Cleaning the cylinder area

STOP

Remove the Þ lter hood and air Þ lter.
Remove the spark plug cap and unscrew the spark plug.
Press in the starting valve and activate the chain brake.
Push the cable cutout and ignition cable out sideways.
Unscrew the two rearmost screws on the cover.
Unscrew the screws on the handguard pivot and remove the

bushing.
Lift the cover out of the air intake guide and remove.

IMPORTANT: Put the air Þ lter back on and fasten it. Insert
the spark plug and hand-tighten.

Put the spark plug cap on the plug and pull out the starting
valve.

Remove the fan housing and remove the air guide.

CAUTION: To prevent eye injury, always wear eye protection
when cleaning the Þ lter with compressed air!

The entire area (17) can now be brushed clean or cleaned with
compressed air.

A bottle brush can come in handy for cleaning out the cylinder
ribs.
With the cyinder Þ n cleaner, clean out the area between the
cylinder Þ ns and between the cylinder and the mounting
plate.
Do not use force. Be careful not to damage the short-circuit
wire and the ignition wire.

14

B

17

C

Replacing/cleaning the spark arrester screen

The spark arrester screen should be checked and cleaned
regulary.

Loosen the screw (18) and remove 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 and tighten the screw.

26

18

19

D

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 instruction manual. All such work must
be carried out by a DOLMAR service centre.

Page

General Chain saw Clean exterior, check for damage. In case of damage,

have repaired by a qualiÞ ed service centre immediately
Saw chain Sharpen regulary, replace in good time 19-20
Chain brake Have inspected regularly at an authorized service centre
Guide bar Turn over to ensure even wear of bearing surfaces

Replace in good time 12, 22
Starter cable Check for damage. Replace if damaged. 25

Before each start Saw chain Inspect for damage and sharpness 19-20
Check chain tension 12

Guide bar Check for damage
Chain lubrication Functional check 15
Chain brake Functional check 16
OFF switch,

Safety locking button,
Throttle lever Functional check 16

Fuel/oil tank
cap Check for tightness

Every day Air Þ lter and
Guide bar Check for damage, clean oil intake bore 22
Guide bar support Clean, in particular the oil guide groove 15, 21
Idle speed Check (chain must not run) 17

Every week Fan housing Clean to maintain good cooling air ß ow. 9
Cylinder area Clean to maintain good cooling air ß ow. 26
Spark plug Check and replace if necessary 24
Mufß er Check tightness of mounting, Clean spark arrester screen 9, 26
Chain guide Check 11
Screws and nuts Check their condition and that they are Þ rmly secured.

Every 3 months Suction head Replace 22
Fuel, oil tanks Clean

Annually Chain saw Check at an authorized service centre
Storage Chain saw Clean exterior, check for damage. In case of damage,

have repaired by a qualiÞ ed service centre immediately
Guide bar/chain Demount, clean and oil slightly
Clean the guide groove of the guide bar 22
Fuel, oil tanks Empty and clean
Carburetor Run empty

Þ lter hood Clean 23

Service, spare parts and guarantee

Maintenance and repair

The maintenance and repair of modern engines as well as all safety devices require qualiÞ ed technical training and a special work-
shop equipped with special tools and testing devices.

We therefore recommend that you consult a DOLMAR service centre for all work not described in this instruction manual.
The DOLMAR service centres have all the necessary equipment and skilled and experienced personnel, who can work out cost-

effective solutions and advise you in all matters.
To Þ nd your local distributor, please visit www.dolmar.com

27

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 instruction 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 centre.

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, com­only with difÞ culty pression system, mechanical malfunction.
No ignition spark Switch on STOP, fault or short-circuit in the
wiring, plug cap or spark plug defective.
Fuel supply Fuel tank is Þ lled Choke in wrong 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 difÞ culties Carburetor Fuel tank is Þ lled Wrong carburetor adjustment.
Ignition spark

Engine starts, but Fuel supply Fuel tank is Þ lled Wrong idling adjustment, suction head or
dies immediately carburetor dirty. Tank venting defective, fuel
line interrupted, cable defective, STOP switch
defective. Starting valve dirty

InsufÞ cient power Several systems Engine is idling Air Þ lter dirty, wrong carburetor adjust-
may be involved ment, mufß er clogged, exhaust channel in cylin-
simultaneously der 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.

28

Extract from the spare parts list

Use only original DOLMAR parts. For repairs and
replacement of other parts, see your DOLMAR service centre.

PS-6400
PS-7300
PS-7900

Pos. DOLMAR-No. Qty. Denomination

1 415 038 655 1 Sprocket nose bar 38 cm (15“)
415 045 655 1 Sprocket nose bar 45 cm (18“)
415 050 655 1 Sprocket nose bar 50 cm (20“)
415 060 655 1 Sprocket nose bar 60 cm (24“)
415 070 455 1 Solid nose bar 70 cm (28“)

2 528 099 760 1 Saw chain 3/8“ for 38 cm
528 099 768 1 Saw chain 3/8“ for 45 cm
528 099 772 1 Saw chain 3/8“ for 50 cm
528 099 784 1 Saw chain 3/8“ for 60 cm
528 099 794 1 Saw chain 3/8“ for 70 cm

3 952 020 140 1 Chain protection for 38 cm
952 020 150 1 Chain protection for 45/50 cm
952 020 160 1 Chain protection for 60 cm
952 030 180 1 Chain protection for 70 cm

4 038 213 103 1 Sprocket guard, cpl.
5 923 208 004 2 Hexagonal nut M8

3

2

1

6 941 719 131 1 Universal wrench SW 19/13
7 940 827 000 1 Offset screwdriver
8 944 340 001 1 Carburetor screwdriver
9 963 601 122 1 Suction head
10 010 114 050 1 Fuel-/Oil tank cap, cpl.
11 963 228 030 1 O-Ring 28x3 mm
12 965 603 021 1 Spark plug
13 108 164 020 1 Starter cable 3.5x980 mm
14 038 173 011 1 Air Þ lter (nylon)
14 038 173 101 1 Air Þ lter (ß eece)
15 038 162 024 1 Cable drum, complete
16 119 224 070 1 3/8” sprocket
17 038 174 040 1 Spark collector, cpl.

10

14

11

12

15

13

17

10

11

9

5

164876

22

23

28

24

27

20

21

25

Accessories (not delivered with the chain saw)

20 953 100 090 1 Chain gauge
21 953 004 010 1 File handle
22 953 003 040 1 Round Þ le, dia. 5,5 mm
23 953 003 070 1 Round Þ le, dia. 4,8 mm
24 953 003 060 1 Flat Þ le
25 953 030 030 1 File holder 3/8“

- 949 000 035 1 Combined can
(for 5l fuel, 2.5l chain oil)
27 957 250 060 1 Spike bar, cpl.
28 038 173 200 1 Pre-Þ lter (nylon)

29

EU Conformity Declaration

The undersigned, Tamiro Kishima and Rainer Bergfeld, as authorized by DOLMAR GmbH, declare that the DOLMAR
machines,

Typ: 038, 039, 040
Chain saw EU prototype test certiÞ cate No.
PS-6400 (040) 4811004.11012
PS-7300 (039) 4811004.11012
PS-7900 (038) 4811004.11012

manufactured by DOLMAR GmbH, Jenfelder Str. 38, 22045 Hamburg, Germany, conforms to the basic safety and health require­ments of the applicable EU Directives:

EU Machinery Directive 2006/42/EG.
EU EMC Directive 89/336/EG.
Outdoor Noise Directive 2000/14/EG.
The most important standards applied to properly meet the requirements of the above EU Directive were: EN 11681-1, CISPR 12,

EN 50082-1.
The conformity assessment procedure 2000/14/EG was performed per Annex V. The measured sound power level (L

dB(A). The guaranteed sound power level (Ld) is 117 dB(A).
The EU-Type-Examination CertiÞ cate was performed by: DEKRA Testing and CertiÞ cation GmbH (2140), Enderstraße 92 b, D-01277

Dresden.
The technical documentation is on Þ le at DOLMAR GmbH, Jenfelder Straße 38, Abteilung FZ, D-22045 Hamburg.

Hamburg, 16.12.2011
For DOLMAR GmbH

Tamiro Kishima Rainer Bergfeld
Managing Director Managing Director

) is 115,6

wa

30

31

106

To Þ nd your local distributor,
please visit www.dolmar.com

32

DOLMAR GmbH
Postfach 70 04 20
D-22004 Hamburg
Germany
http://www.dolmar.com

SpeciÞ cations subject to change without notice

Form: 995 701 221 (2012-06 GB)