McCulloch MAC 250 B User Manual

INSTRUCTION MA NUAL

IMPORTANT INFORMATION

GB

sure you understand them before using this unit. Retain these instructions for future
reference.

: Please read these instructions carefully and make

MANUEL D’INSTRUCTIONS

RENSEIGNEMENTS IMPORTANTS:

FR

atentivement les instructions et assurez- -vous de les avoir comprises. Conservez
les instructions pour référence ultérieure.

Avant d’utiliser cet appareil, veuillez lire

BETRIEBSANWEISUNG

WICHTIGE INFORMATI ON:

DE

Geräts aufmerksam durch. Verwenden Sie es erst, wenn Sie sicher sind, daß Sie
alle Anweisungen verstanden haben und gut aufbewahren.

Lesen Sie diese Hinweise zur Handhabung des

MANUAL DE INSTRUCCIONES

INFORMACIÓN IMPORTANTE:

ES

asegúrese de entenderlas antes de utilizar esta aparato. Conserve las instruc­ciones para la referencia en el futuro.

Lea atentamente las instrucciones y

115306726 Rev. 5 1/15/11 BRW

IDENTIFICATION (WHAT IS WHAT?)

3

7

8

9

12

10

14

13

19

5

4

2

1

9

11

22

20

21

1. Fuel tank

2. Handlebar

3. ON/STOP switch

4. Throttle cable clip

5. Shoulder harness clamp

6. Shoulder harness

7. Trimmer head

8. Line limiter blade

9. Combination shield

10. Shaft

11. Blade

12. Throttle trigger

17

18

6

16

15

23

13. Throttle lock--out

14. Start throttle button

15. Starter handle

16. Fuel cap

17. Primer bulb

18. Choke lever

19. Muffler

20. Wrench

21. Hex wrench

22. Transport guard

23. Instruction manual

2

IDENTIFICATION OF SYMBOLS

A.

D.

F.

I.

B.

C.

WARNING! This brushcutter can be dangerous! Careless or improper use can

A.

cause serious or even fatal injury.
B. Read and understand the instruction manual before using the brushcutter.
C. Always use:

Ear protection, eye protection, head protection, boots, and gloves.

D. DANGER! Blade can thrust violently away from material it does not cut. Blade

thrust can cause amputation of arms or legs. Keep people and animals 15 meters

away.

E. WARNING! Blade/trimmer line can throw objects violently. You andothers can be

blinded or injured. Always wear eye protection and leg protection.
F. The operator of the machine must insure that no one comes within a 15 meter radius

while working. When several operators are working withinthe same area a safety dis-

tance of at least 15 meters must be observed.
G. Use unleaded or quality leaded petrol and two--stroke oil mixed at a ratio of 2.5%.
H. Handlebar to be positioned only below the arrow.
I. Engine ON/STOP Switch.
J. Guaranteed sound power level according to Directive 2000/14/EC

K. Maximum rotational frequency of the spindle, rpm

E.

G.

H.

J.

K.

SAFETY RULES

WARNING: When using gardening

appliances, basic safety precautions should al­ways be followed to reduce the risk of fire and
serious injury. Read and follow all instructions.

DANGER: This power tool can be

dangerous! This unit can cause serious injury
including amputation or blindness to the op­erator and others. The warnings and safety
instructions inthis manual must be followed to
provide reasonable safety and efficiency in
using the unit. The operator is responsible for
following the warnings andinstructions in this
manual and on the unit. Read the entire in­struction manual before assembling and us­ing the unit! Restrict the use of this unit to per­sons who read, understand, and follow the
warnings and instructions in this manual and
on the unit. Never allow children to operate
this unit.

INSTRUCTION
MANUAL

DANGER: Blade can thrust violently

away from material it does not cut. Blade
thrust can cause amputation of arms or legs.
Keep people and animals 15 meters away.

SAFETY INFORMATION
ON THE UNIT

3

WARNING: Blade/trimmer line can

throw objects violently.Youand others canbe
blinded or injured. Wear safety glasses and
leg protection.

WARNING: Hazard zone for thrown

objects. Blade/Trimmerline can throw objects
violently. Others can be blinded or injured.
Keep people and animals 15 meters away.

Hazard Zone

WARNING: Do not use trimmer head

as a fastening device for the blade.

WARNING: The blade continues to

spin after the throttle is released or, engine is
turned off. The coasting blade can throw objects
or seriously cut if accidentally touched. Stop the
blade by contacting the right hand side of the
coasting blade with material already cut.

Stop coasting
blade by contact
with cut material.

OPERATOR SAFETY

WARNING: This machine produces

an electromagnetic field during operation. Under
some circumstances, this field may interfere
with active or passive medical implants. To re­duce the risk of serious or fatal injury, we recom­mend persons with medical implants to consult
their physician and the medical implant
manufacturer before operating this machine.
S Dress properly. Always wear safety

glasses or similar eye protection when op­erating, or performing maintenance, on
your unit (safety glasses are available).
Eye protection should be marked Z87.

S Always wear a helmet if the trees to be

cleared are taller than 2 meters.

S Always wear face or dust mask if operation

is dusty.

S Always wear heavy, long pants, long

sleeves, boots, and gloves. Wearing safety
leg guards is recommended.

S Always wear foot protection. Do not go

barefoot or wear sandals. Stay clear of
blade/spinning line.

S Secure hair above shoulderlength. Secure

or remove loose clothing or clothing with
loosely hanging ties, straps, tassels, etc.
They can be caught in moving parts.

S Being fully covered also helps protect you

from debris and pieces of toxic plants
thrown by spinning line.

S Stay alert. Do not operate this unit when you

are tired, ill, upset or under the influence of al­cohol, drugs, or medication. Watch what you
are doing; use common sense.

S Wear hearing protection. Long or continu-

ous exposure to high noise levels may
cause permanent hearing impairment.

S Mufflers fitted with catalytic converters get

very hot during use and remain so for some
time after stopping. This also applies at idle
speed. Contact can result in burns to theskin.
Remember the risk of fire!

S Never start or run inside a closed room or

building. Breathing exhaust fumes can kill.

S Keep handles free of oil and fuel.
S Always use the handlebar and a properly

adjusted shoulder harness with a blade
(see ASSEMBLY).

UNIT / MAINTENANCE SAFETY

WARNING: Stop unit and disconnect

the spark plug before performing mainte­nance (except carburetor adjustments).
S Throw away blades that are bent, warped,

cracked, broken, or damaged in any other
way. Replace trimmer head parts that are
cracked, chipped, broken, or damaged in
any other way before using the unit.

S Maintain unit according to recommended

procedures. Keep blade sharp. Keep cut­ting line at the proper length.

S Use only 2,4 mm diameter McCulloch

brand replacement line. Never use wire,
rope, string, etc.

4

S Install required shield properly before using

the unit.

S Use only specified blade or trimmer head;

make sure it is properly installed and se­curely fastened.

S Never start engine with clutch shroud re-

moved. Theclutch can fly off and cause se­rious injury.

S Be sure blade ortrimmer headstops turning

when engine idles.

S Make carburetor adjustments with the low-

er end supported to prevent blade or trim­mer line from contacting any object. Hold
unit by hand; do not use the shoulder har­ness for support.

S Keep othersaway when mak ing carbure-

tor adjustments.

S Use only recommended McCulloch accesso-

ries and replacement parts.

S Have all maintenance and service not ex-

plained in this manual performed by your au­thorised service dealer.

FUEL SAFETY

S Mix and pour fuel outdoors.
S Keep away from sparks or flames.
S Use a container approved for fuel.
S Do not smoke orallow smoking near fuelor

the unit.

S Avoid spilling fuel or oil. Wipe up all fuel spills.
S Move at least 3 meters away from fueling

site before starting engine.

S Stop engine and allow to cool before re-

moving fuel cap.

S Always store petrol in a container approved

for flammable liquids.

CUTTING SAFETY

WARNING: Inspect the area to be cut

before each use. Remove objects (rocks,
broken glass, nails, wire, string, etc.) which
can be thrown or become entangled in the
blade or trimmer head.
S Keep others including children, animals,

bystanders, and helpers at least50 feet (15
meters) away. Stop engine immediately if
you are approached.

S Always keep engine on the right--hand side

of your body.

S Hold the unit firmly with both hands.
S Keep firm footing and balance. Do not

overreach.

S Keep blade or trimmer head below waist

level. Do not raise engine above your waist.

S Keep all parts of your body away from blade,

trimmer head, and muffler when engine is
running. A hot muffler can cause serious
burns.

S Cut from your left to your right. Cutting on

right side of the shield will throw debris
away from the operator.

S Use only in daylight or good artificial light.
S Use only for jobs explained in this manual.

TRANSPORTING AND STORAGE

S Allow the engine to cool; secure unit before

storing or transporting in vehicle.

S Empty fuel tank before storing or transporting

the unit. Use up fuel left in the carburetor by
starting engine and letting it run until it stops.

S Store unit andfuel in an area where fuelva-

pors cannot reach sparks or open flames
from water heaters, electric motors or
switches, furnaces, etc.

S Store unitso line limiter cannot accidentally

cause injury. Unit can be hung by the shaft.

S Always install transport guard on blade be-

fore transporting or strorage.

S Store the unit out of the reach of children.
S Secure the machine during transport.

SPECIAL NOTICE: Exposure to vibrations

through prolonged use of petrol powered hand
tools could cause blood vessel or nerve dam­age in the fingers, hands, and joints of people
prone to circulation disorders or abnormal swell­ings. Prolonged use in cold weather has been
linked to blood vessel damage in otherwise
healthy people. If symptoms occur such as
numbness, pain, loss of strength, change inskin
color or texture, or loss of feeling in the fingers,
hands, or joints, discontinue the use of this tool
and seek medical attention. An anti-vibration
system does not guarantee the avoidance of
these problems. Users who operate power tools
on a continual and regular basis must monitor
closely their physical condition andthe condition
of this tool.

ASSEMBLY

CARTON CONTENTS

Check carton contents against the following list:

S Brushcutter
S Blade
S Cupped washer
S Large nut for installing blade
S Trimmer head
S Combination shield
S Bolt
S Handlebar
S Hand lebar bracket cover
S Hand lebar bracket cover scre w s (2 )
S Upper shoulder harness clamp
S Lower shoulder harness clamp
S Shoulder harness clamp screws (2)

S Shoulder harness
S Hex wrench
S Wrench
S Transport guard
S Throttle cable clip

WARNING: Always stop unit anddis-

connect spark plugbefore performing anyas­sembly procedures.

WARNING: If received assembled,

repeat allsteps to ensure your unit is properly
assembled and all fasteners are secure.
Examine parts for damage. Do not use dam­aged parts.

5

It is normal for the fuel filter to rattle in the
empty fuel tank.
Finding fuel or oil residue on muffleris normal
due to carburetor adjustments and testing
done by the manufacturer.

TOOLS REQUIRED

S Hex wrench (provided)
S Adjustable wrench
S Phillips screwdriver

ATTACHING THE HANDLEBAR

DANGER: To avoid serious injury, the

barrier portion of the handlebar must beinstalled
as shown to provide a barrier between operator
and the spinning blade.

1. Remove the screw at the rear of the
throttle handle.

2. Slide the throttle handleonto theright side
of the handlebar (see illustration).

3. Align the screw hole in the throttle handle
with the hole in the handlebar.

4. Refit thescrew inthe holein the rear of the
throttle handle.

5. Screw the screw through the handle and
handlebar. Tighten the screw.

6. Fit the mounting components as shown.

ATTACHING SHOULDER HARNESS
CLAMP

1. Place the upper shoulder harness clamp
over the shaft.

2. Position the lower shoulder harness
clamp under the shaft and align the upper
and lower clamp screw holes. Clamp
must befittle above the arrow on the shaft
(see illustration above).

NOTE: Fit throttle wire in groove of lower

harness clamp before tightening screws.

3. Insert two screws into the screw holes.

4. Secure shoulder harness clamp by tight­ening screws with a hex wrench.

SHOULDER HARNESS
ADJUSTMENT

At the front of the shoulder harness is an easily
accessible quick release. Use the quick release
in any emergency situation that requires you to
free yourself from the machine and harness.

1. Put onthe harness. Adjust the harness for
the best working position.

2. Tension the side straps so that the weight
is evenly distributed across both shoul­ders.

7. The handlebar mounting must be fitted
between the arrows on the shaft.

8. Tighten the screws with a hex wrench.

ASSEMBLY OF SHOULDER
HARNESS

WARNING: When using a brushcut-

ter, it must always be hooked securely to the
shoulder harness. Otherwise, you will be un­able to safely control the brushcutter. This
can result in injury to yourself or others.
Proper shoulder harness and handlebar adjust­ments must be made with the engine complete­ly stopped before using unit. A well- -adjusted
shoulder harness and machine makes work
much easier.

NOTE: It may be necessary to relocate the

shoulder harness clamp on the shaft for prop­er balancing of unit.

SHOULDER HARNESS

ADJUSTMENT

FOR BALANCE

15 cm

6

below
waist

76 cm

10 -- 30 cm

above

ground

76 cm

ATTACHING THE SHIELD

WARNING: The shield must be prop-

erly installed. The shield provides partial
protection to the operator and others from the
risk of thrown objects, and is equipped with a
line limiterblade which cuts excess line to the
proper length. The line limiter blade (on un­derside of shield) is sharp and can cut you.

1. Insert bracket into slot on shield.

2. Pivot shield to align holes in shield and
bracket.

Bracket

Slot

Shield

ASSEMBLY INFORMATION -­TRIMMER HE AD

TRIMMER
HEAD

NOTE: Remove the blade before attaching the

trimmer head. To remove blade , align hole in
the dust cup with the hole in the side of the
gearbox by rotating the blade. Insert a small
screwdriver into aligned holes. This will keep
the shaft from turning while loosening the blade
nut. Remove blade nut by turning clockwise.
Remove the screwdriver. Remove both wash­ers and blade. See INSTALLATION OF THE
METALBLADE forillustrations. Be sure tostore
all parts and instructions for future use.

INSTALLATION OF THE TRIMMER
HEAD
NOTE:

the threads on the threaded shaft, remove the
covering to expose thethreads. Before instal­ling thetrimmer head, make sure thedust cup
and retaining washer are positioned on the
gearbox as shown below.

If your unit has a plastic cover over

Shield

Gearbox

3. Secure shield to bracket with bolt.

Bolt

CONFIGURING YOUR UNIT

Youcan configure your unit using a cutting head
for grass and light weeds, or a weed blade for
cutting grass, weeds, and brush up to 1 cm in
diameter. T o assemble your unit, go to the sec­tion for the desired configuration and follow the
instructions.

Dust cup

Retaining washer

NOTE: Make sure all parts are properly

installed as shown in the illustration before
installing the trimmer head.

1. Align hole in the dust cup with the hole in the
side of the gearbox by rotating the dust cup.

2. Insert a small screwdriver into aligned
holes. This will keep the shaft fromturning
while tightening trimmer head.

3. While holding the screwdriver in position,
thread trimmer head onto the shaft in the
direction shown on the decal (counter­clockwise). Tighten until secure.

NOTE: The retaining washer must be posi-

tioned with the raised section facing toward the
gearbox.

7

ASSEMBLY INFORMATION -- WEED
BLADE

WEED
BLADE

Shield

Gearbox

Dust cup

Threaded
shaft

NOTE: Remove the trimmer head before

Installing the weed blade. To remove the trim­mer head,align hole in the dust cupwith the hole
in the side of the gearbox by rotating the dust
cup. Insert a small screwdriver into aligned
holes. This will keep the shaft from turning while
loosening the trimmer head. Remove the trim­mer head by turning clockwise. Remove the
screwdriver. See INSTAL LATION OF THE
TRIMMER HEAD for illustrations. Be sure to
store all parts and instructions for future use.
Never use the trimmer head with the metal
blade installed.

INSTALLATION OF THE METAL
BLADE

WARNING: Wear protective gloves

when handling or performing maintenance on
the blade to avoid injury. The blade is sharp and
can cut you even when it is not moving.

WARNING: Do not use any blades, or

fastening hardware other than the washers and
nuts shown in the following illustrations. These
parts must be provided by McCulloch and
installed as shown below. Failure to use proper
parts can cause the blade to fly off and seriously
hurt you or others.

NOTE: The dust cup is located onthe gearbox

shaft and not in the parts bag. All other fasten­ers mentioned in the following assembly steps
are in the parts bag.

1. Install the blade and the retaining washer
over the threaded shaft.

2. Make sure the raised part of the retaining
washer is facingthe gearbox and the raised
area fits into the hole in the center of the
blade.

3. Slide the blade and retaining washer onto
the shaft of the gearbox.

4. Place the cupped washer onto the shaft.
Make sure the cupped side of the washer
is toward the blade.

5. Install the blade nut by threading onto the
shaft counterclockwise.

Retaining washer

Cupped washer

Nut

Wrench

NOTE: Make sure all parts are in place as il-

lustrated, and the blade is sandwiched between
the dust cup and the retaining washer. There
should be no space between the blade and the
dust cup or the retaining washer.

6. Align hole in dust cup with hole in side of
gearbox by rotating the blade.

7. Insert a small screwdriver into aligned
holes. This will keep the shaft fromturning
while tightening the blade nut.

8. Tighten blade nut firmly with a wrench while
holding screwdriver in position.

9. Remove the screwdriver.

10. Turn blade by hand. If the blade binds
against the shield, or appears to be uneven,
the blade is not centered, and you must re­install.

NOTE: To remove blade, insert screwdriver

into aligned holes. Unthread thenut and remove
parts. Be sure to store parts and instructions for
future use.

Blade

ATTACHING THE TRANSPORT
GUARD

The transport guardmust always be

NOTE:

attached tothe bladewhen themachine is be­ing transported or in storage.

1. Remove ends of wire retainer from the
clips on the transport guard.

2. Lift wire retainer and position blade in
transport guard.

3. Place wire retainer over blade and insert
both ends of wire retainer back into clips.

Wire retainer

Clip

Transport
guard

8

OPERATION

WARNING: Be sure to read the fuel

information in the safety rules before you be­gin. If you do not understand the safety rules,
do not attempt to fuelyour unit. Contact anau­thorised service dealer.

FUELING ENGINE

WARNING: Remove fuel cap slowly

when refueling.
This engine is certified to operate on unleaded

petrol. Before operation, petrol must be mixed
with a goodquality 2- -cycle air--cooled engine oil
designed to be mixed at a ratio of 40:1. A 40:1
ratio is obtained by mixing 5 liters of unleaded
petrol with 0,125 liter of oil. DO NOT USE auto­motive oil or marine oil. These oils will cause en­gine damage. When mixing fuel, follow instruc­tions printed on oil container. Once oil is added
to petrol, shake container momentarily toassure
that the fuel is thoroughly mixed. Always read
and follow the safety rules relating to fuel before
fueling your unit.

CAUTION: Never use straight petrol in your

unit. This will cause permanent engine damage.

FUEL REQUIREMENTS

Use good quality unleadedpetrol. The lowest
recommended octane grade is 90 (RON).

IMPORTANT

Use of alcohol blended fuels (more than 10% al­cohol) can cause major engine performance
and durability problems.

WARNING: Incorrect use of fueland/

or lubricants will cause problems s uc h as:
improper clutch engagements, overheat­ing,vapor lock, power loss, lubric ation defi­ciency, deterioration of fuel lines , gaskets
and internal carburetor components, etc.
Alcohol blended fuels will cause a high ab­sorption of moisture in the fuel/oil mixture,
causing the separation of oil and fuel.

HOW TO STOP YOUR UNIT

S To stop the engine, move the ON/STOP

switch to the STOP position.

ON/STOP
Switch

ST ARTI NG A COLD ENGINE (or a
warm engine after running out of fuel)

Starting position

NOTE: The throttle lock--out is designed to

prevent unintentional use of the throttle trig­ger. The lock--out must be pressed with the
palm of your hand as you grip the throttle han­dle before the trigger can be used.

1. Set unit on a flat surface.

2. Move ON/STOP switch to the ON position.

3. Slowly press the primer bulb 6 times.

4. Move choke lever to FULL CHOKE posi­tion.

Primer Bulb

Choke
Lever

Starter
Handle

HOW TO START YOUR UNIT

WARNING: Avoid any contact with the

muffler. A hot muffler can cause serious burns.

5. Set the throttle to the start position by first
pressing the throttle lock--out and the
throttle trigger, then pressing the start
throttle button. Then release the throttle
lock--out and the throttle trigger, followed
by the start throttle button. The throttle
function is now activated.

NOTE: The start throttle button should stay

depressed, holding the throttle open. If not, re­peat step 5. T o return the engine to idle, press
the throttle lock- -out and throttle trigger again.

9

Start throttle
button

Throttle

Throttle
trigger

6. Pull starter rope handle sharply until en­gine sounds as if it is trying to start, but do
not pull rope more than 6 times.

7. As soon as engine sounds as if it is trying to
start, move choke lever to HALF CHOKE.

8. Pull starter rope sharply until engine runs,
but no more than 6 pulls. If the engine
doesn’t start after 6 pulls (at the HALF
CHOKE position), move the choke lever to
the FULL CHOKE position and press the
primer bulb 6 times. Pull the starter rope 2
more times. Move the choke lever to the
HALF CHOKE position and pull the starter
rope until the engine runs, but no more than

NOTE: If engine still doesn’t start,

6 pulls.
it is probably flooded. Proceed to START­ING A FLOODED ENGINE.

9. Once the engine starts, allow it to run 10
seconds, then move the choke lever to
RUN. Allow the unit to run for 30 more
seconds at RUN before releasing the
throttle trigger.
the choke lever in the RUN position, move
the choke lever to the HALF CHOKE
position and pull the rope until engine
runs, but no more than 6 pulls.

STARTING A WARM ENGINE

1. Move ON/STOP switch to the ON position.

2. Move the choke lever to the HALF
CHOKE position.

3. Set the throttle tothe start position by acti­vating the start throttle button (see step 5
under STARTING A COLD ENGINE).

4. Pull starter rope sharply until engine runs,
but no more than 5 pulls.

5. Allow engine to run 15 seconds, then move
the choke lever to the RUN position.

NOTE: If engine has not started, pull starter

rope 5more pulls. If engine still doesnot run,it
is probably flooded.

STARTING A FLOODED ENGINE

Flooded engines can be started by placing
the choke lever in the RUN position. Fully
squeeze throttle trigger; then, pull the rope to
clear the engine of excess fuel. This could re­quire pulling the starter handle many times
depending on how badly the unit is flooded.
If the unit still doesn’t start, refer to TROU­BLESHOOTING TABLE.

NOTE: If engine dies with

lock--out

OPERATING POSITION

ALWAYS WEAR:

Hearing
Protection

Heavy,
Long Pants

Boots

Cut from your left to your right.

When operating unit, clip shoulder harness
onto clamp,stand as shown andcheck for the
following:

S Wear eye protection and heavy clothing.
S Extend your left arm and hold handlebar

grip with your left hand.

S Hold throttle grip with your right hand with

finger on throttle trigger.

S Keep unit below waist level.
S Maintain full weight of tool on both shoulders.
S Without bending over, keep the blade or

trimmer head near and parallel to the ground
and not crowded into material being cut.

Safety Helmet

Eye Protection

OPERATING INSTRUCTIONS FOR
USE WITH TRIMMER HEAD

WARNING: Always wear eye protec-

tion. Never lean over the trimmer head. Rocks
or debris can ricochet or be thrown into eyes
and face and cause blindness or other serious
injury.
Before trimming, bring engineto a speed suffi­cient to cut material to be trimmed.
Do not run the engine at a higher speed than
necessary. The cutting line will cut efficiently
when the engine is run at less than full throttle.
At lower speeds, there is less engine noise and
vibration. The cutting line will last longer and will
be less likely to “weld” onto the spool.
Always release the throttle trigger and allow
the engine to return to idle speed when not
cutting.
To stop engine:

S Release the throttle trigger.
S Move the ON/STOP switch to the STO P

position.

TRIMMER LINE ADVANCE

Advance line by tapping thebottom of the cut­ting head lightly on the ground while engine is
running at full speed. The metal line limiter
blade attached to the guard will cut the line to
the proper length.

WARNING: Use only 2,4 mmdiameter

line. Other sizes of line will not advance properly
and can cause serious injury. Do not use other
materials such as wire, string, rope, etc. Wire
can break off during cutting and become a dan­gerous missile that can cause serious injury.

10

CUTTING METHODS

f

L

WARNING: Use minimum speed and

do not crowd the line when cutting around
hard objects (rock, gravel, fence posts, etc.),
which candamage thetrimmer head,become
entangled in the line, or be thrown causing a
serious hazard.
S The tip of the line does the cutting. You will

achieve the best performance and minimum
line wear by not crowding the line into the
cutting area. The right and wrong ways are
shown below.

Tip o

line does

the cutting.

Right Wrong

ine crowded into

work area.

Scalping

MOWING -- Your trimmer is ideal for mowing
in places conventional lawn mowers cannot
reach. In the mowing position, keep the line
parallel to the ground. Avoid pressing the
head into the ground as this can scalp the
ground and damage the tool.

Mowing

S The line will easily remove grass and weeds

from around walls, fences, trees and flower
beds, but it also can cut the tender bark of
trees or shrubs and scar fences.

S For trimming or scalping, use less than full

throttle to increase line life and decrease head
wear, especially:

S During light duty cutting.
S Near objects around which the line can

wrap such as small posts, trees or fence
wire.

S For mowing or sweeping, use full throttle for a

good clean job.
TRIMMING -- Hold the bottom of the trimmer
head about 8 cm above the ground and at an
angle. Allow only the tip of the line to make
contact. Do not force trimmer line into work
area.

Trimming

8 cm above
ground

SCALPING -- The scalping technique re­moves unwanted vegetation down to the
ground. Hold the bottom of the trimmer head
about 8cm above the ground andat an angle.
Allow the tip of the line to strike the ground
around trees, posts, monuments, etc. This
technique increases line wear.

SWEEPING -- The fanning action of the rotat­ing line canbe usedto blowaway loose debris
from an area. Keep the line parallel to and
above the area surface and swing the tool
from side to side.

Sweeping

OPERATING INSTRUCTIONS FOR
USE WITH WEED BLADE

S Blade Thrust is a reaction that only occurs

when using a bladed unit. This reaction can
cause serious injury such as amputation.
Carefully study this section. It is important that
you understand what causes blade thrust,
how you can reduce the chance of its
occurring, and how you can remain in control
of unit if blade thrust occurs.

S WHAT CAUSES BLADE THRUST -- Blade

Thrust can occur when the spinning blade

contacts an object that it does not cut. This
contact causes the blade to stop for an instant
and then suddenly move or “thrust” away
from the object that was hit. The “thrusting”
reaction can be violent enough to cause the
operator to be propelled in any direction and
lose control of the unit. The uncontrolled unit
can cause serious injury if the blade contacts
the operator or others.

11

S WHEN BLADE THRUST OCCURS --

Blade Thrust can occur without warning if

the blade snags, stalls, or binds. This is

more likely to occur in areas where it is

difficult to see the material being cut. By

using the unit properly, the occurrence of

blade thrust will be reduced and the

operator will be less likely to lose control.

S Cut only grass, weeds, and woody brush up

to 1 cm in diameter with the weed blade. Do

not let the blade contact material it cannot cut

such as stumps, rocks, fences, metal, etc., or

clusters of hard, woody brush having a

diameter greater than 1 cm.
S Keep the blade sharp. A dull blade is more

likely to snag and thrust.
S Cut only at full throttle. The blade will have

maximum cutting power and is less likely to

bind or stall.
S “Feed” the blade deliberately and not too

rapidly. The blade can thrust away ifit is fed

too rapidly.
S Cut only from your left to your right. Cutting on

right side of the shield will throw debris away

from the operator.
S Use the shoulder harness and keep a firm

grip on the unit with both hands. A properly

adjusted shoulder harness will support the

weight of the unit, freeing your arms and

hands to control and guide the cutting motion.
S Keep feet comfortably spread apart and

braced for a possible sudden, rapid thrust of

unit. Do not overreach. Keep firm footing and

balance.

S Keep blade below waist level; it will be

easier to maintain control of unit.

S Do notraise the engine above your waistas

the blade can come dangerously close to
your body.

S Do not swing unit with such force that you

are in danger of losing your balance.
Bring the engine to cutting speed before enter­ing the material to be cut. If the blade does not
turn when you squeeze the throttle trigger,make
sure shaft is fully inserted into the engine.
Always release the throttle trigger and allow
engine to return to idle speed when not cut­ting. The blade should not turn while the en­gine isrunning at idle. If theblade turns atidle,
do not use your unit. Refer to the CARBURE­TOR ADJUSTMENT section or contact your
authorised service dealer.
S Maintain good firm footing while using the

unit. Do this by planting feet firmly in a

comfortable apart position.
S Cut while swinging the upper part of your

body from left to right.
S Asyoumoveforwardtothenextareatocut,

be sure to maintain your balance and footing.

RECOMMENDED CUTTING POSITION

Cut using the 2
o’clock to 4 o’clock
position of the
blade

2 o’clock

4 o’clock

WARNING: The operator or others

must not try to clear away cutmaterial with the
engine running or the blade turning to avoid
serious injury. Stop engine and blade before
removing materials wrapped around blade or
shaft.

MAINTENANCE

The life span of the machine can be reduced
and the risk of accidents can increase if ma­chine maintenance is not carried out correctly
and if service and/or repairs are not carried
out professionally. If you need further infor­mation, please contact your nearest autho­rised service dealer.

WARNING: Disconnect the spark

plug before performing maintenance except
for carburetor adjustments.

CHECK FOR LOOSE
FASTENERS AND PARTS

S Spark Plug Boot
S Air Filter
S Housing Screws
S Handlebar Screws
S Combination Shield

CHECK FOR DAMAGED OR
WORN PARTS

Contact an authorised service dealer for re­placement of damaged or worn parts.
S ON/STOP Switch -- Ensure ON/STOP switch

functions properly by moving the switch to the

STOP position. Make sure engine stops; then

restart engine and continue.
S Fuel Tank -- Discontinue use of unit if fuel

tank shows signs of damage or leaks.
S Debris Shield -- Discontinue use of unit if

debris shield is damaged.

INSPECT AND CL EAN UNIT AND
LABELS

S After each use, inspect complete unit for

loose or damaged parts. Clean the unit and

labels using a damp cloth with a mild deter-

gent.
S Wipe off unit with a clean dry cloth.

12

CLEAN AIR F ILTER

A dirty air filter decreases engine perform­ance and increases fuel consumption and
harmful emissions. Always clean after every
5 hours of operation.

1. Clean the cover and the area around it to
keep dirt from falling into the carburetor
chamber when the cover is removed.

2. Remove parts as illustrated.

NOTE: Do not clean filter in petrol or other

flammable solvent to avoid creating a fire haz­ard or producing harmful evaporative emis­sions.

3. Wash the filter in soap and water.

4. Allow filter to dry.

5. Replace parts.

Button

Air Filter

Air Filter Cover

SERVICE AND ADJUSTMENTS

REPLACING THE LINE

1. Press the tabs on the side of the trimmer
head and remove cover and spool.

REPLACE SPARK PLUG

Replace the spark plug each year to ensure
the engine starts easier and runs better. Set
spark plug gap at 0,6 mm. Ignition timing is
fixed and nonadjustable.

1. Twist, then pull off spark plug boot.

2. Remove spark plug from cylinder anddis­card.

3. Replace with Champion RCJ-6Y spark
plug and tighten securely with a 19 mm
socket wrench.

4. Reinstall the spark plug boot.

Cover

Tab

Tab

Spool

2. Remove any remaining line.

3. Clean dirt and debris from all parts. Re­place spool if it is worn or damaged.

4. Replace with a pre-wound spool, or re­place line using a 4,5 meters length of2,4
mm diameter McCulloch brand line.

13

WARNING: Never use wire, rope,

string, etc., which can break offand become a
dangerous missile.

5. When installing new line on an existing
spool, hold the spool as shown.

6. Bend the line at the midpoint and insert
the bend into the slot in the center rim of
the spool. Ensure line snaps into position
in the slot.

Slot

9. Place the spool in the cover as shown
below.

10. Insert the ends of the lines through exit
holes in the sides of the cover.

Line exit hole

7. With your finger between the lines, wrap
the lines evenly and firmly around the
spool in a clockwise direction.

8. Position the lines in the guide slots.

Guide slot

Guide slot

Cover

11. Reinstall the spool and cover onto the
trimmer head.Push until cover snaps into
place.

14

BLADE REPLACEMENT

Refer tothe ASSEMBLY section for blade re­placement instructions and illustrations.

CARBURETOR ADJUSTMENT

WARNING: Keep others away when

making idle speed adjustments. The trimmer
head will be spinning during most of this pro­cedure. Wear your protective equipment and
observe all safety precautions. After making
adjustments, the trimmer head must not
move/spin at idle speed.
The carburetor has been carefully set at the
factory. Adjustments maybe necessary ifyou
notice any of the following conditions:
S Engine will not idle when the throttle is re-

leased.
S The trimmer head moves/spins at idle speed.
Make adjustments with the unit supported so
the cutting attachment is off the ground and
will not make contact withany object. Holdthe
unit byhand while running and making adjust­ments. Keep all parts of your body away from
the cutting attachment and muffler.

Idle Speed Adjustment

Allow engineto idle. Adjust speeduntil engine
runs without trimmer head moving or spinning
(idle speed too fast) or engine stalling (idle
speed too slow).

STORAGE

S Turn idle speed screw clockwise to in-

crease enginespeed ifengine stalls ordies.

S Turn idle speed screw counterclockwise to

decrease engine speed if trimmer head
moves or spins at idle speed.

WARNING: Recheck the idle speed

after each adjustment. The trimmer head
must not move or spin at idle speed to avoid
serious injury to the operator or others.

Idle Speed Screw

Air Filter Cover

If yourequire further assistance orare unsure
about performing this procedure, contact an
authorised service dealer.

WARNING: Perform the following

steps after each use:
S Allow engineto cool before storing or trans-

porting.
S Store unit and fuel in a well ventilated area

where fuel vapors cannot reach sparks or

open flames from water heaters, electric

motors or switches, furnaces, etc.
S Empty fuel tank before storing or transport-

ing the unit.
S Store unit and fuel well out of the reach of

children.
S Store unit with all guards in place. Position

unit so that any sharp object cannot acci-

dentally cause injury.

SEASONAL STORAGE

Prepare unit for storage at endof season or if
it will not be used for 30 days or more.
If your unit is to be stored for a period of time:

S Clean the entire unit before lengthy storage.
S Store in a clean dry area.
S Lightly oil external metal surfaces.

ENGINE

S Remove spark plug andpour 1 teaspoon of

40:1, 2-cycle engine oil (air cooled) through
the spark plug opening. Slowly pull the
starter rope 8 to 10 times to distribute oil.

S Replace spark plug with new one of recom-

mended type and heat range.

S Clean air filter.
S Check entire unit for loose screws, nuts,

and bolts. Replace any damaged, broken,
or worn parts.

S At the beginning of the next season, use

only fresh fuel having theproper petrol tooil
ratio.

OTHER

S Do not store petrol from one season to

another.

S Replace your petrol can if it starts to rust.

15

TROUBLESHOOTING TABLE

WARNING: Always stop unit anddisconnect spark plug before performing all ofthe

recommended remedies below except remedies that require operation of the unit.

TROUBLE CAUSE REMEDY

Engine will not
start.

Engine will
not idle
properly.

Engine will not
accelerate,
lacks power,
or dies under
a load.

Engine
smokes
excessively.

Engine runs
hot.

1. ON/STOP switch in STOP
position.

2. Engine flooded.

3. Fuel tank empty.

4. Spark plug not firing.

5. Fuel not reaching
carburetor.

6. Carburetor requires
adjustment.

1. Carburetor requires
adjustment.

2. Crankshaft seals worn.

3. Compression low.

1. Air filter dirty.

2. Spark plug fouled.

3. Carburetor requires
adjustment.

4. Carbon build-up on
muffler outlet screen.

5. Compression low.

1. Choke partially on.

2. Fuel mixture incorrect.

3. Air filter dirty.

4. Carburetor requires
adjustment.

1. Fuel mixture incorrect.

2. Spark plug incorrect.

3. Carburetor requires
adjustment.

4. Carbon build-up on
muffler outlet screen.

1.MoveON/STOPswitchtoON
position.

2. See “Starting a Flooded Engine” in

Operation Section.

3. Fill tank with correct fuel mixture.

4. Install new spark plug.

5. Check for dirty fuel filter; replace.

Check for kinked or split fuel line;
repair or replace.

6. Contact an authorised service dealer.

1. See “Carburetor Adjustment” in

Service and Adjustments Section.

2. Contact an authorised service dealer.

3. Contact an authorised service dealer.

1. Clean or replace air filter.

2. Clean or replace plug
and regap.

3. Contact an authorised service dealer.

4. Contact an authorised service dealer.

5. Contact an authorised service dealer.

1. Adjust choke.

2. Empty fuel tank and refill with
correct fuel mixture.

3. Clean or replace air filter.

4. Contact an authorised service dealer.

1. Empty fuel tank and refill with
correct fuel mixture.

2. Replace with correct spark plug.

3. Contact an authorised service dealer.

4. Contact an authorised service dealer.

16

DECLARATION OF CONFORMITY

EC Declaration of Conformity (Only applies to Europe)
We, Husqvarna AB, SE-561 82 Huskvarna, Sweden, tel: [phone], as authorised

representative in the Community, declare that the brushcutter model McCulloch Mac 250 B
with serial numbers dating from 2009 and onwards (the year is clearly stated on the rating
plate, followed by the serial number), comply with the requirements of the COUNCIL’S
DIRECTIVES:

of 17 May 2006 “relating to machinery” 2006/42/EC;
of 15 December 2004 “relating to electromagnetic compatibility” 2004/108/EC, and applicable

supplements; and
of 8 May 2000 “relating to the noise emissions in the environment” in accordance with Annex

Vof2000/14/EC. For information relating to noise emissions, see Technical data section.
The following standards have been applied: EN ISO 12100-1/A1:2009, EN ISO

12100-2/A1:2009, CISPR 12:2007, EN 11806:2008.
SMP, The Swedish Machinery Testing Institute, Fyrisborgsgatan 3 S--754 50 Uppsala,

Sweden, has performed voluntary type examination on behalf of Husqvarna AB. The
certificate(s) are numbered: SEC/09/2027.

0 9 -- 11 -- 0 1

Ronnie E. Goldman, Director of Engineering
Authorized representative for Husqvarna AB and
responsible for technical documentation

17

TECHNICAL DAT A SHEET

MODEL: Mac 250 B

ENGINE

Cylinder displacement, cm
At maximum engine power, rpm 8000
Maximum rotational frequency of the spindle 10000
Engine speed at recommended maximum spindle
rotational frequency 7400
Recommended speed idling, rpm 3000
Maximum engine power, measured in
accordance with ISO 8893, kW 0,7
Catalytic converter muffler Yes

IGNITION SYSTEM

Spark plug Champion RCJ--6Y
Electrode gap, mm 0,6

FUEL AND LUBRICATION SYSTEM

Fuel tank capacity, cm

WEIGHT

Weight without fuel, cutting attachment and guard, kg 5,6

NOISE EMISSIONS
(see Note 1)

Sound power level, measured dB(A) 110,3
Sound power level, guaranteed L

NOISE LEVELS
(see Note 2)

Equivalent sound pressure level at the operators’ ear,
measured according to EN/ISO 11806 and ISO 22868, dB(A)

Equipped with grass blade (original) 99,0
Equipped with trimmer head (original) 98,5

VIBRATION LEVELS
(see Note 3)

Equivalent vibration levels (a
according to EN ISO 11806 and ISO 22867, m/s

Equipped with grass blade (original), left/right 4,4/6,9
Equipped with trimmer head (original), left/right 4,7/4,2

Note 1: Noise emissions in the environment measured as sound power (L
with EC directive 2000/14/EC. Reported sound power level for the machine has been
measured with the original cutting attachment that gives the highest level. The difference
between guaranteed and measured sound power is that the guaranteed sound power also
includes dispersion in the measurement result and the variations between different machines
of the same model according to Directive 2000/14/EC.

Note 2: Reported data for equivalent sound pressure level for the machine has a typical
statistical dispersion (standard deviation) of 1 dB(A).

Note 3: Reported data for equivalent vibration level has a typical statistical dispersion
(standard deviation) of 1 m/s

3

3

dB(A) 114,0

WA

) at handles, measured

hv,eq

2

.

2

25

340

) in conformity

WA

Model Mac 250 B (3/8 LH arbor shaft thread)
Centre hole in blades/cutters, ∅ 25,4 mm

Approved accessories Type Cutting attachment /guard, part. no.

Grass blade/grass cutter Grass (∅ 20 cm, 4--teeth) 530 05 58 92 / 575 35 27 01
Trimmer head TNG7 (∅ 2, 4 mm lin e) 537 41 92--02 / 575 35 27 01

18