Dolmar PS-6400 User manual

1
Instruction Manual
Original Instruction Manual
Important:
Read this instruction manual carefully before putting the chain saw into operation and strictly observe the
safety regulations!
Keep this instruction manual!
http://www.dolmar.com
PS-6400, PS-6400 H
PS-7300, PS-7300 H
PS-7900, PS-7900 H

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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 (only for EU-countries) ............17
Adjusting the carburetor (only for not EU-countries) ......18
Working in summer / winter ............................................19
Handle heating (only PS-6400 H, 7300 H, 7900 H) .....19
MAINTENANCE
Sharpening the saw chain .......................................20-21
Cleaning the brake band and sprocket interior .............22
Cleaning the guide bar ................................................. 23
Replacing the saw chain ...............................................23
Replacing the suction head .........................................23
Cleaning the air filter and the filter hood .......................24
Replacing the spark plug ..............................................25
Checking the ignition spark ........................................... 25
Checking the muffler screws ......................................... 25
Replacing the starter cable / Replacing the return spring 26
Mounting the fan housing ............................................. 27
Cleaning the cylinder area ............................................27
Replacing/cleaning the spark arrester screen .............. 27
Instructions for periodic maintenance ...........................28
Service, spare parts and guarantee ...........................28-29
Trouble shooting ..............................................................29
Extract from spare parts list ...........................................30
Accessories ..................................................................30
EU conformity declaration ...............................................31
Thank you for purchasing a DOLMAR
product!
Congratulations on choosing a DOLMAR chain saw! We are confi-
dent that you will be satisfied 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-flow oil pump
and maintenance-free electronic ignition ensure trouble-free
operation, while the hand-saving anti-vibration system and ergo-
nomic 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 per-
sonal 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 card-
board box to protect against shipping damage.
Cardboardis a basic rawmaterialand is consequently reuseable
or suitable for recycling (waste paper recycling).

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STOP
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5 6 7
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Delivery inventory
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 fin cleaner
9. Instruction 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 saw and in the Instruction Manual:
Caution, kickback!
Chain brake
Fuel and oil mixture
Working in summer / winter
Carburetor adjustment
Chain oil fill/oil pump
Saw chain oil
adjustment screw
First aid
Recycling
CE - Marking
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 fire!
Stop engine!
Start engine
Off switch

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1
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:
- Professionaland 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 influence of drugs, alcohol
or medication must not use this saw.
General precautions
- Toensurecorrectoperationtheuserhastoreadthisinstruc-
tion manual to make himself familiar with the characteristics
of the chain saw. Users insufficiently 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 be-
come 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
qualified trainer.
- Use chain saws always with the utmost care and attention.
- Operatethe chain sawonly if you are ingood 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 fire extinguisher must be available in the immediate vicinity
when working in easily inflammable vegetation or when it has
not rained for a long time (danger of fire).
Protective equipment
- In order to avoid head, eye, hand or foot injuries as well
as to protect your hearing the following protective equip-
ment must be used during operation of the chain saw:
- The kind of clothing should be appropriate, i. e. it should be
tight-fitting 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
3
2
- 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) fitted 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.

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9
8
Fuels / Refuelling
- Stop the engine before refuelling the chain saw.
- Do not smoke or work near open fires (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 im-
mediately 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 ac-
cumulate near the floor (explosion hazard).
- Ensure to firmly 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.
Checkespeciallythefunctionofthechainbrake,thecorrectmount-
ing of the guide bar, the correct sharpening and tightening of the
chain, the firm 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 instruc-
tion manual (8). Other starting methods are not allowed.
- When starting the chain saw it must be well supported and se-
curely 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 lefthand. Hold thehandles tightly withyour thumbs
facing your fingers.
- 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,tighteningthechain,replacingitor clearing malfunc-
tions (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
inflammable objects. The muffler is very hot (danger of fire).
- CAUTION: Oil dropping from the chain or guide bar after having
stopped the saw chain will pollute the soil. Always use an appro-
priate base.
● Maintenance ● Stopping work
● Refuelling ● Transport
● Sharpening the chain ● Putting out of function
3 meters

6
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.
- Ensurethat the chain isalways 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 saw-
ing 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 firmly 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.
- Whenperformingseveral cuts the throttlelevermustbe released
in between.
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12
13
14
11

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- 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), first 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:
Peoplefellingtrees or cutting ofbranchesmustbe 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.
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18
19
= cutting down area
45o
45o
2 1/2

8
SERVICE
Transport and storage
- When changing your location during work switch off the chain
saw and actuate the chain brake in order to prevent an inadvert-
ent 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 muffler
(danger of burns).
- Ensuresafepositioningofthechainsawduringcartransportation
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 ship-
ping 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.
Observetheaccidentpreventioninstructionsissuedbytrade
associationsandinsurancecompanies.Donotperformany
modifications 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
anyresponsibilityfor accidents anddamageresultingfrom using
sawing devices or accesories which have not been approved.
First aid
For the event of a possible accident, please make sure that a
first aid kit is always immediately available close by. Immediately
replace any items used from the first 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 fingers,
handsorwrists:”Fallingasleep”(numbness),tingling, pain, stabbing
sensation, alteration of skin colour or of the skin. If any of these
symptoms occur, see a physician!
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Denomination of components
1 Handle
2 Filter hood
3Filter hood clip
4 Tubular handle
5 Hand guard (release for chain brake)
6 Muffler
7Spike bar
8Chain tensioning screw
9Retaining nuts
10 Chain catch
11 Sprocket guard
12 Identification plate
13 Starting valve (option)
14 Starter grip
15 Adjusting screws for carburetor
16 I/STOP-switch
17 Choke switch and half-throttle lock
18 Throttle lever
19 Safety locking button
20 Rear hand guard
21 Fuel tank cap
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)
12 Grip heater switch (option)
Identification plate (12)
Indicate when ordering spare parts
Serial number
Year of manufacture
Stroke volume cm3 64 72.6 78.5
Bore mm 47 50 52
Stroke mm 37 37 37
Max. power at speed 3) kW / 1/min 3.5 / 9,000 4.2 / 9,500 4.6 / 9,500
Max. torque at speed 3) 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 LpA, eq per ISO/CD 22868 1) 4) dB (A) 104,3 / KpA = 2,5 104,3 / KpA = 2,5 104,3 / KpA = 2,5
Sound power level LWA, eq per ISO/CD 22868 1) 4) dB (A) 113,3 / KWA = 2,5 113,3 / KWA = 2,5 113,3 / KWA = 2,5
Vibration acceleration ahv, eq per ISO 22867 1) 4)
- Tubular handle m/s2 5.9 / K=2 6.2 / K=2 6.6 / K=2
- Rear handle m/s2 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 3) kg/h 1.72 2.33 2.3
Specific consumption at max. load per ISO 7293 3) 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
engages manually or in case of kickback
Chain speed 2) m/s 19.74 20.83 20.83
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 6.3 6.3 6.3
1) Figures derived in equal part from idling, full-load and racing speed.
2) At max. power. 3) For models without starting valve. 4) Uncertainty (K=).
-
Technical data PS-6400 PS-7300 PS-7900
DOLMAR PS-7900
2009 123456
038.100.010 Typ 038
DOLMAR GmbH, 22045 Hamburg, Germany
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14 15
16 17
18 19
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12
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1126
202122
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6
45
1
2
3
Liftthechain(6)overthesprocket(5).Usingyourrighthand,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!
Position the guide bar (4) and push against the sprocket (5)
as shown by the arrow.
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 direc-
tion of arrow.
Unscrew retaining nuts (2).
Pull off the sprocket guard (3).
C
D
PUTTING INTO OPERATION
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 protec-
tive gloves!
CAUTION:
Start the chain saw only after having assembled it com-
pletely and inspected.
STOP
B
A

11
2
13
3
11
12
6 8
9 10
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).
Pull the chain (6) around the sprocket nose (8) of the guide
bar in the direction of the arrow.
G
H
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.
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).
F
E

12
STOP
2
13
12
1
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
Loosenthenuts(2)aboutoneturn with the universal wrench.
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
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
B
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 sufficiently strong.
The chain will stop within a fraction of a second.
Thechainbrakeis installed toblockthesawchainbeforestart-
ing it and to stop it immediately in case of an emergency.
IMPORTANT: NEVER run the saw with the chain brake acti-
vated (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!

13
Chain oil
Use an oil with adhesive additive for lubricating the chain and
guide bar. The adhesive additive prevents the oil from being
flung 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).
E
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).
D
Fuel
CAUTION:
This saw is powered by mineral-oil products (gasoline and
oil).
Be especially careful when handling gasoline.
Avoid all flame or fire. Do not smoke (explosion hazard).
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 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 air-
cooled 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 avail-
able in the following sizes:
0,5 l order number 980 008 109
DOLMAR high-performance two-stroke engine oil is available in
the following sizes to suit your individual requirements:
1 l order number 980 008 107
100 ml order number 980 008 106
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-
tions.
The correct mixture ratio:
50:1 whenusingDOLMARhigh-performance two-stroke engine
oil, i. e. mix 50 parts gasoline with 1 part oil.
100:1 whenusingDOLMAR HP100high-performancetwo-stroke
engine oil, i. e. mix 100 parts gasoline with 1 part oil.
50:1 when using other synthetic two-stroke engine oils
(quality grade JASO FC or ISO EGD), i. e. mix 50 parts
gasoline with 1 part oil.
NOTE: For preparing the fuel-oil mixture first mix the entire oil
quantity with half of the fuel required, then add the remaining
fuel. Thoroughly shake the mixture before filling it into the chain
saw tank.
It is not wise to add more engine oil than specified
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 muffler. In ad-
dition, fuel consumption will rise and performance
will decrease.
The Storage of Fuel
Fuels have a limited storage life. Fuel and fuel mixtures
age through evaporation, especially at high tempera-
tures. 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
youreyes,immediatelywash them withclearwater.Ifyour
eyes are still irritated, see a doctor immediately!
100:1
+
Gasoline 50:1 50:1
1000 cm3 (1 litre) 20 cm3 20 cm310 cm3
5000 cm3 (5 litres) 100 cm3 100 cm3 50 cm3
10000 cm3 (10 litres) 200 cm3 200 cm3 100 cm3
OIL
50:1
DOLMAR
OIL

14
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 cap and fill the tank with fuel (fuel/oil mixture)
or chain oil as the case may be. Fill up to the bottom edge
of the filler neck. Be careful not to spill fuel or chain oil!
Tightly screw on the cap.
Clean screw cap and tank after refuelling.
Lubricating the chain
During operation there must always be sufficient chain oil in
the chain-oil tank to provide good chain lubrication. One filling
is sufficient 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!
waste 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
periodoftime, it will desiccate.Variousskindeseasesmay 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!
age to the oil pump or other parts.
The next time you use the saw, fill 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.
A
B
STOP
chain oil fuel/oil mixture
Important note on bio-degradable chain oils
If you are not planning to use the saw again for an ex-
tended 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 flush 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-

15
1
2 3
Checking the chain lubrication
Never work with the chain saw withoute sufficient 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. 15 cm above a trunk or the
ground (use an appropriate base).
If the lubrication is sufficient, you will see a light oil trace be-
cause oil will be flung 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.
C
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.
E
STOP
D
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.
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
influence the oil flow rate. While working make sure there is
enough chain oil in the tank. If necessary, add oil.
Adjustment
range 70°

16
Starting the engine
Start the chain saw only after having assembled it com-
pletely 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.
Steady the rear handle by standing in the hand guard.
132 4
6 5
A
Checking the chain brake
Do not work with the chain saw without first 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
that the guide bar is free of contact).
Grasp the tubular handle firmly 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.
7
C
B
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).
Nowpull the starter cable witha fast andforceful movement
until you hear the first 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
soonastheengine is running, grasp the rearhandle(thisactuates
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 ac-
tivate the half-throttle lock.
Stopping the engine
Move the I/STOP ignition switch to
the “STOP” position.

17
CAUTION:
Do not adjust the carburetor until the machine has been
completely assembled and checked! Do not adjust the
carburetor without a tachometer!
Carburetor adjustment is necessary for optimum engine
performance, for safer and more economical operation.
Adjust the carburetor only with the engine warm, a clean
air filter, and properly installed cutting tool.
Carburetor adjustment may be done only by a DOLMAR
service centre. Improper adjustment can cause damage
to the engine.
In order to comply with new emissions legislation, limits have
been placed on the carburetor adjusting screws (H) and (L).
This limitation (to about 180 degrees) prevents an exces-
sively rich mixture. This in turn ensures compliance with
emissions rules as well as optimum engine performance and
economical fuel consumption.
You will need a tachometer (part No. 950 233 210) for op-
timum adjustment. Exceeding the maximum permissible
speed can lead to overheating and under-lubricating, and
damage to the engine!
Factory setting of adjusting screws (H) and (L): Turned out
almost all the way (counterclockwise).
Use a screwdriver (blade width 4 mm, part No. 944 340 001)
to adjust the screws.
For proper adjustment, proceed as follows:
Checking adjusting screw (H)
Before starting the engine make sure that adjusting screw (H) is
turned out counterclockwise until it reaches a noticeable stop.
The limitations do not prevent excessively lean (under-lu-
bricated) running!
1. Start engine and let it warm up (3-5 minutes)
2. Set idle
3. Check acceleration
4. Set maximum permissible speed
5. Check idle speed
2. Set idle
Set the idle speed per the technical specifications.
Turning the adjusting screw (S) in (clockwise) increases the
idle speed. Turning it out (counter-clockwise) lowers the idle
speed. The cutting tool must not rotate!
3. Check acceleration
When the throttle is pressed, the engine should go smoothly
from idle to high speed.
Turn adjusting screw (L) out (counterclockwise) in small
increments until acceleration is good.
4. Set maximum permissible speed
Set the maximum speed by minimal adjustments of the
adjusting screw (H) in accordance with the technical speci-
fications.Turningtheadjustingscrew(H)clockwise increases
the speed. Never exceed the maximum permissible
speed!
For units with electronic engine speed limitation: No
tachometer is necessary to determine the maximum
permissible speed, since exceeding this speed will
result in clearly audible ignition misses!
5. Check idle speed
Check the idle speed after setting the top speed (the cutting
tool must not rotate!).
Repeat the adjustment procedure starting at Step 2, until the
engine runs with the correct idle speed, good acceleration,
and maximum permissible speed.
S-
+
H-
+
S-
+
L-
+
H
Adjusting the carburetor (only for EU-countries)
A
L H
S

18
B
Carburetor adjustment is necessary for optimum engine
performance,for safer and moreeconomicaloperation. The
engine should be warm, the air filter clean, and the chain
properly tensioned. Have carburetor adjustment done by
an authorised DOLMAR service centre.
The carburetor is factory-adjusted for the air pressure at sea
level. At other elevations or under other conditions of weather,
temperature,orhumidity,orwhenbreakinginanewengine,itmay
be necessary to make slight adjustments to the carburetor.
You will need a tachometer (9, part No. 950 233 210) for
optimum adjustment.
Do not go below the specified setting of the main nozzle
(H). Doing so may cause engine damage due to overheating
and insufficient lubrication!
Use the supplied carburetor screwdriver (8) for carburetor adju-
stment. It has a moulded-on projection that aids in adjusting.
Before undertaking the adjustment, run the engine for 3-5 mi-
nutes to warm it up, but not at high speed!
For proper adjustment, proceed as follows:
1. Basic setting (engine off)
Start engine and warm up.
2. Set idle
3. Check acceleration
4. Check top speed
5. Check idle speed
Repeat steps 2-5 until you get the right idle speed, good
acceleration and maximum permissible
1. Basic setting
Carefully turn the adjusting screws for the main nozzle (H)
and idle nozzle (L) clockwise until you feel a stop.
Turn adjusting screws (H) and (L) 1 turn counter-clockwise.
2. Set idle
Set the idle speed per the technical specifications.
Turning the adjusting screw (S) in (clockwise) increases the
idle speed. Turning it out (counter-clockwise) lowers the idle
speed. In no case should the chain move.
3. Check acceleration
When the throttle is pressed, the engine should go smoothly
from idle to high speed. If this is too slow, turn the adjusting
screw (L) in small (max. 1/8turns) increments counter-clo-
ckwise.
4. Check top speed
The basic setting H=1and L=1gives a maximum speed of
about 13,000 rpm. For higher speed (electronically limited to
13,500rpm),turn the adjusting screw(H)amaximum 1/4 turn
clockwise.The top speed in the governor can be clearly heard
from the ignition misses. Note: Since there is an electronic
speed governor (limiter) at13,500 rpm that cutsoffthe ignition
current, the top speed cannot be read from the tachometer.
Important: To prevent engine damage, never go below
setting (H) 3/4 turns.
5. Check idle speed
Check the idle speed after setting the top speed (the chain
must not move).
Repeat the adjustment procedure starting at Step 2, until the
engine runs with the correct idle speed, good acceleration,
and top speed.
Adjusting the carburetor (only for not EU-countries)
L H
S
8
9

19
C
Working in winter
In order to prevent carburetor icing in conditions of low tempe-
rature 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 filter hood (see „Cleaning air filter“)
Remove the insert (10) and insert it as shown in position Bfor
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 Afor
normal operation.
Position A- Normal operation
Position B- Cold-weather operation
Reinstall the filter hood.
BA
10
11
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
D

20
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 file. If the proper file is used in the right manner, the
correct front rake will be obtained automatically.
C
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 flour.
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 file will be enough.
Have the chain resharpened at a service centre when you have
already sharpened it yourself several times.
STOP
A
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,
thechain mustbe replaced (seethe Extractfrom 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!
0.64 mm
(.025“)
0.64 mm
(.025“)
B
min.
3 mm (0.11”)