McCulloch Brush Cutter MAC 250 B User Manual

INSTRUCTION MANUAL  
IMPORTANT INFORMATION: Please read these instructions carefully and make  
sure you understand them before using this unit. Retain these instructions for future  
reference.  
GB  
FR  
MANUEL D’INSTRUCTIONS  
RENSEIGNEMENTS IMPORTANTS: Avant d’utiliser cet appareil, veuillez lire  
atentivement les instructions et assurez--vous de les avoir comprises. Conservez  
les instructions pour référence ultérieure.  
BETRIEBSANWEISUNG  
WICHTIGE INFORMATION: Lesen Sie diese Hinweise zur Handhabung des  
Geräts aufmerksam durch. Verwenden Sie es erst, wenn Sie sicher sind, daß Sie  
alle Anweisungen verstanden haben und gut aufbewahren.  
DE  
ES  
MANUAL DE INSTRUCCIONES  
INFORMACIÓN IMPORTANTE: Lea atentamente las instrucciones y  
asegúrese de entenderlas antes de utilizar esta aparato. Conserve las instruc-  
ciones para la referencia en el futuro.  
115306726 Rev. 5 1/15/11 BRW  
 
IDENTIFICATION OF SYMBOLS  
A.  
B.  
C.  
D.  
F.  
G.  
H.  
I.  
E.  
J.  
K.  
A. WARNING! This brushcutter can be dangerous! Careless or improper use can  
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 and others 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 within the 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  
SAFETY RULES  
WARNING: When using gardening  
appliances, basic safety precautions should al-  
ways be followed to reduce the risk of fire and  
INSTRUCTION  
MANUAL  
SAFETY INFORMATION  
ON THE UNIT  
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 op-  
erator and others. The warnings and safety  
instructions in this manual must be followed to  
provide reasonable safety and efficiency in  
using the unit. The operator is responsible for  
following the warnings and instructions in this  
manual and on the unit. Read the entire in-  
struction manual before assembling and us-  
ing the unit! Restrict the use of this unit to per-  
sons who read, understand, and follow the  
warnings and instructions in this manual and  
on the unit. Never allow children to operate  
this unit.  
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.  
3
 
OPERATOR SAFETY  
WARNING: Blade/trimmer line can  
throw objects violently. You and others canbe  
blinded or injured. Wear safety glasses and  
leg protection.  
WARNING: This machine produces  
an electromagnetic field during operation. Under  
some circumstances, this field may interfere  
with active or passive medical implants. To re-  
duce the risk of serious or fatal injury, we recom-  
mend 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 op-  
erating, 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.  
WARNING: Hazard zone for thrown  
objects. Blade/Trimmer line can throw objects  
violently. Others can be blinded or injured.  
Keep people and animals 15 meters away.  
S Always wear face or dust mask if operation  
is dusty.  
S Always wear heavy, long pants, long  
sleeves, boots, and gloves. Wearingsafety  
leg guards is recommended.  
ard Zone  
S Always wear foot protection. Do not go  
barefoot or wear sandals. Stay clear of  
blade/spinning line.  
S Secure hair above shoulder length. 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 al-  
cohol, 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 the skin.  
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).  
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.  
UNIT / MAINTENANCE SAFETY  
WARNING: Stop unit and disconnect  
the spark plug before performing mainte-  
nance (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 cut-  
ting line at the proper length.  
Stop coasting  
blade by contact  
with cut material.  
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 Hold the unit firmly with both hands.  
S Keep firm footing and balance. Do not  
overreach.  
S Use only specified blade or trimmer head;  
make sure it is properly installed and se-  
curely fastened.  
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 Never start engine with clutch shroud re-  
moved. The clutch can fly off and cause se-  
rious injury.  
S Be sure bladeor trimmer head stops turning  
when engine idles.  
S Cut from your left to your right. Cutting on  
right side of the shield will throw debris  
away from the operator.  
S Make carburetor adjustments with the low-  
er end supported to prevent blade or trim-  
mer line from contacting any object. Hold  
unit by hand; do not use the shoulder har-  
ness for support.  
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 and fuel in an area where fuel va-  
pors cannot reach sparks or open flames  
from water heaters, electric motors or  
switches, furnaces, etc.  
S Store unit so 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 dam-  
age in the fingers, hands, and joints of people  
prone to circulation disorders or abnormal swell-  
ings. 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 in skin  
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 and the condition  
of this tool.  
S Keep others away when making 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 au-  
thorised 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 or allow smoking near fuel or  
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 least 50 feet (15  
meters) away. Stop engine immediately if  
you are approached.  
S Always keep engine on the right--hand side  
of your body.  
ASSEMBLY  
S Shoulder harness  
S Hex wrench  
CARTON CONTENTS  
Check carton contents against the following list:  
S Brushcutter  
S Wrench  
S Transport guard  
S Throttle cable clip  
S Blade  
S Cupped washer  
S Large nut for installing blade  
S Trimmer head  
WARNING: Always stop unit and dis-  
connect spark plug before performing any as-  
sembly procedures.  
S Combination shield  
S Bolt  
S Handlebar  
S Handlebar bracket cover  
S Handlebar bracket cover screws (2)  
S Upper shoulder harness clamp  
S Lower shoulder harness clamp  
S Shoulder harness clamp screws (2)  
WARNING: If received assembled,  
repeat all steps to ensure your unit is properly  
assembled and all fasteners are secure.  
Examine parts for damage. Do not use dam-  
aged parts.  
5
 
It is normal for the fuel filter to rattle in the  
empty fuel tank.  
ATTACHING SHOULDER HARNESS  
CLAMP  
Finding fuel or oil residue on muffler is normal  
due to carburetor adjustments and testing  
done by the manufacturer.  
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 be fittle above the arrow on the shaft  
(see illustration above).  
TOOLS REQUIRED  
S Hex wrench (provided)  
S Adjustable wrench  
S Phillips screwdriver  
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 tight-  
ening screws with a hex wrench.  
ATTACHING THE HANDLEBAR  
DANGER: To avoid serious injury, the  
barrier portion of the handlebar must be installed  
as shown to provide a barrier between operator  
and the spinning blade.  
1. Remove the screw at the rear of the  
throttle handle.  
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.  
2. Slide the throttle handle onto the right side  
of the handlebar (see illustration).  
3. Align the screw hole in the throttle handle  
with the hole in the handlebar.  
4. Refit the screw inthe hole in 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.  
1. Put on the harness. Adjust the harness for  
the best working position.  
2. Tension the side straps so that the weight  
is evenly distributed across both shoul-  
ders.  
NOTE: It may be necessary to relocate the  
shoulder harness clamp on the shaft for prop-  
er balancing of unit.  
SHOULDER HARNESS  
ADJUSTMENT  
7. The handlebar mounting must be fitted  
between the arrows on the shaft.  
8. Tighten the screws with a hex wrench.  
FOR BALANCE  
ASSEMBLY OF SHOULDER  
HARNESS  
WARNING: When using a brushcut-  
ter, it must always be hooked securely to the  
shoulder harness. Otherwise, you will be un-  
able to safely control the brushcutter. This  
can result in injury to yourself or others.  
Proper shoulder harness and handlebar adjust-  
ments must be made with the engine complete-  
ly stopped before using unit. A well--adjusted  
shoulder harness and machine makes work  
much easier.  
15 cm  
below  
waist  
10 -- 30 cm  
above  
ground  
76 cm  
6
 
ASSEMBLY INFORMATION --  
TRIMMER HEAD  
TRIMMER  
HEAD  
76 cm  
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 wash-  
ers and blade. See INSTALLATION OF THE  
METAL BLADE for illustrations. Be sure to store  
all parts and instructions for future use.  
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 limiter blade which cuts excess line to the  
proper length. The line limiter blade (on un-  
derside 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.  
INSTALLATION OF THE TRIMMER  
HEAD  
NOTE: If your unit has a plastic cover over  
the threads on the threaded shaft, removethe  
covering to expose the threads. Beforeinstal-  
ling the trimmer head, make sure the dust cup  
and retaining washer are positioned on the  
gearbox as shown below.  
Bracket  
Shield  
ot  
Shield  
3. Secure shield to bracket with bolt.  
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 willkeep 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 (counter-  
clockwise). Tighten until secure.  
Bolt  
CONFIGURING YOUR UNIT  
You can 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. To assemble your unit, go to the sec-  
tion for the desired configuration and follow the  
instructions.  
NOTE: The retaining washer must be posi-  
tioned with the raised section facing toward the  
gearbox.  
7
 
ASSEMBLY INFORMATION -- WEED  
BLADE  
Gearbox  
Dust cup  
Shield  
WEED  
BLADE  
Threaded  
shaft  
Retaining washer  
Blade  
NOTE: Remove the trimmer head before  
Installing the weed blade. To remove the trim-  
mer head, align hole in the dust cup with 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 trim-  
mer head by turning clockwise. Remove the  
screwdriver. See INSTALLATION 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.  
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 willkeep the shaft fromturning  
while tightening the blade nut.  
INSTALLATION OF THE METAL  
BLADE  
8. Tighten blade nut firmly with a wrench while  
holding screwdriver in position.  
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.  
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 re-  
install.  
NOTE: To remove blade, insert screwdriver  
into aligned holes. Unthread the nut and remove  
parts. Be sure to store parts and instructions for  
future use.  
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 on the gearbox  
shaft and not in the parts bag. All other fasten-  
ers mentioned in the following assembly steps  
are in the parts bag.  
1. Install the blade and the retaining washer  
over the threaded shaft.  
ATTACHING THE TRANSPORT  
GUARD  
NOTE: The transport guard must always be  
attached to the blade when themachine is be-  
ing 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.  
2. Make sure the raised part of the retaining  
washer is facing the gearbox and the raised  
area fits into the hole in the center of the  
blade.  
3. Place wire retainer over blade and insert  
both ends of wire retainer back into clips.  
Wire reta
ransport  
3. Slide the blade and retaining washer onto  
the shaft of the gearbox.  
uard  
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.  
Clip  
8
 
OPERATION  
STARTING A COLD ENGINE (or a  
WARNING: Be sure to read the fuel  
information in the safety rules before you be-  
gin. If you do not understand the safety rules,  
do not attempt to fuelyour unit. Contact an au-  
thorised service dealer.  
warm engine after running out of fuel)  
Starting position  
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 good quality 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 auto-  
motive oil or marine oil. These oils will cause en-  
gine damage. When mixing fuel, follow instruc-  
tions printed on oil container. Once oil is added  
to petrol, shake container momentarily to assure  
that the fuel is thoroughly mixed. Always read  
and follow the safety rules relating to fuel before  
fueling your unit.  
NOTE: The throttle lock--out is designed to  
prevent unintentional use of the throttle trig-  
ger. The lock--out must be pressed with the  
palm of your hand as you grip the throttle han-  
dle 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 posi-  
tion.  
Primer Bulb  
CAUTION: Never use straight petrol in your  
unit. This will cause permanent engine damage.  
FUEL REQUIREMENTS  
Use good quality unleaded petrol. The lowest  
recommended octane grade is 90 (RON).  
IMPORTANT  
Use of alcohol blended fuels (more than 10% al-  
cohol) can cause major engine performance  
and durability problems.  
WARNING: Incorrect use of fuel and/  
or lubricants will cause problems such as:  
improper clutch engagements, overheat-  
ing, vapor lock, power loss, lubrication defi-  
ciency, deterioration of fuel lines, gaskets  
and internal carburetor components, etc.  
Alcohol blended fuels will cause a high ab-  
sorption of moisture in the fuel/oil mixture,  
causing the separation of oil and fuel.  
Choke  
Lever  
HOW TO STOP YOUR UNIT  
S To stop the engine, move the ON/STOP  
switch to the STOP position.  
Starter  
Handle  
ON/STOP  
Switch  
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, re-  
peat step 5. To return the engine to idle, press  
the throttle lock--out and throttle trigger again.  
HOW TO START YOUR UNIT  
WARNING: Avoid any contact with the  
muffler. A hot muffler can cause serious burns.  
9
 
OPERATING POSITION  
Start throttle  
button  
Safety Helmet  
ALWAYS WEAR:  
Hearing  
Protecti
Throttle  
lock--out  
tion  
Throttle  
trigger  
Heavy,  
Long Pan
6. Pull starter rope handle sharply until en-  
gine sounds as if it is trying to start, but do  
not pull rope more than 6 times.  
Boo
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  
6 pulls. NOTE: If engine still doesn’t start,  
it is probably flooded. Proceed to START-  
ING A FLOODED ENGINE.  
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.  
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. NOTE: If engine dies with  
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 to the start position by acti-  
vating 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 5 more pulls. If enginestill does not run, it  
is probably flooded.  
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.  
Beforetrimming, bring enginetoa speedsuffi-  
cient 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 STOP  
position.  
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 re-  
quire pulling the starter handle many times  
depending on how badly the unit is flooded.  
If the unit still doesn’t start, refer to TROU-  
BLESHOOTING TABLE.  
TRIMMER LINE ADVANCE  
Advance line by tapping the bottom of the cut-  
ting 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 mm diameter  
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 dan-  
gerous missile that can cause serious injury.  
10  
 
CUTTING METHODS  
Scalping  
WARNING: Use minimum speed and  
do not crowd the line when cutting around  
hard objects (rock, gravel, fence posts, etc.),  
whichcan damage 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.  
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.  
Tip of line does  
the cutting.  
Line crowded into  
work area.  
Mowin
Right  
Wrong  
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.  
SWEEPING -- The fanning action of the rotat-  
ing line canbe used to blow away loose debris  
from an area. Keep the line parallel to and  
above the area surface and swing the tool  
from side to side.  
S For trimming or scalping, use less than full  
throttle to increase line life and decrease head  
wear, especially:  
Sweeping  
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.  
OPERATING INSTRUCTIONS FOR  
USE WITH WEED BLADE  
Trim
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.  
8 cm above  
ground  
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.  
SCALPING -- The scalping technique re-  
moves unwanted vegetation down to the  
ground. Hold the bottom of the trimmer head  
about 8 cm above the ground and at an angle.  
Allow the tip of the line to strike the ground  
around trees, posts, monuments, etc. This  
technique increases line wear.  
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 Keep blade below waist level; it will be  
easier to maintain control of unit.  
S Do not raise the engine above your waist as  
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 enter-  
ing 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 cut-  
ting. The blade should not turn while the en-  
gine is running at idle. If the bladeturns at idle,  
do not use your unit. Refer to the CARBURE-  
TOR ADJUSTMENT section or contact your  
authorised service dealer.  
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 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 As you move forward to the next area to cut,  
be sure to maintain your balance and footing.  
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.  
RECOMMENDED CUTTING POSITION  
2 o’clock  
S “Feed” the blade deliberately and not too  
rapidly. The blade can thrust away if it is fed  
too rapidly.  
Cut using the 2  
o’clock to 4 o’clock  
position of the  
blade  
4 o’clock  
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.  
WARNING: The operator or others  
must not try to clear away cut material withthe  
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 ma-  
chine maintenance is not carried out correctly  
and if service and/or repairs are not carried  
out professionally. If you need further infor-  
mation, please contact your nearest autho-  
rised service dealer.  
CHECK FOR DAMAGED OR  
WORN PARTS  
Contact an authorised service dealer for re-  
placement 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.  
WARNING: Disconnect the spark  
plug before performing maintenance except  
for carburetor adjustments.  
CHECK FOR LOOSE  
FASTENERS AND PARTS  
S Spark Plug Boot  
INSPECT AND CLEAN UNIT AND  
LABELS  
S Air Filter  
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 Housing Screws  
S Handlebar Screws  
S Combination Shield  
S Wipe off unit with a clean dry cloth.  
12  
 
CLEAN AIR FILTER  
REPLACE SPARK PLUG  
A dirty air filter decreases engine perform-  
ance and increases fuel consumption and  
harmful emissions. Always clean after every  
5 hours of operation.  
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. 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 toavoid creating a firehaz-  
ard or producing harmful evaporative emis-  
sions.  
1. Twist, then pull off spark plug boot.  
2. Remove spark plug from cylinder and dis-  
card.  
3. Replace with Champion RCJ-6Y spark  
plug and tighten securely with a 19 mm  
socket wrench.  
4. Reinstall the spark plug boot.  
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.  
C
Spool  
Tab  
Tab  
2. Remove any remaining line.  
3. Clean dirt and debris from all parts. Re-  
place spool if it is worn or damaged.  
4. Replace with a pre-wound spool, or re-  
place line using a 4,5 meters length of 2,4  
mm diameter McCulloch brand line.  
13  
 
9. Place the spool in the cover as shown  
below.  
WARNING: Never use wire, rope,  
string, etc., which can break off and becomea  
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.  
10. Insert the ends of the lines through exit  
holes in the sides of the cover.  
Line exit hole  
ver  
7. With your finger between the lines, wrap  
the lines evenly and firmly around the  
spool in a clockwise direction.  
11. Reinstall the spool and cover onto the  
trimmer head. Push until cover snaps into  
place.  
8. Position the lines in the guide slots.  
Guide slot  
Guide slot  
14  
 
S Turn idle speed screw clockwise to in-  
crease enginespeed if enginestalls or dies.  
S Turn idle speed screw counterclockwise to  
decrease engine speed if trimmer head  
moves or spins at idle speed.  
BLADE REPLACEMENT  
Refer to the ASSEMBLY section for blade re-  
placement instructions and illustrations.  
CARBURETOR ADJUSTMENT  
WARNING: Keep others away when  
making idle speed adjustments. The trimmer  
head will be spinning during most of this pro-  
cedure. Wear your protective equipment and  
observe all safety precautions. After making  
adjustments, the trimmer head must not  
move/spin 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.  
The carburetor has been carefully set at the  
factory. Adjustments may benecessary if you  
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 with any object. Hold the  
unit by hand while runningand making adjust-  
ments. Keep all parts of your body away from  
the cutting attachment and muffler.  
Idle Speed Adjustment  
Allow engine to idle. Adjust speed until engine  
runs without trimmer head moving or spinning  
(idle speed too fast) or engine stalling (idle  
speed too slow).  
If you require further assistanceor are unsure  
about performing this procedure, contact an  
authorised service dealer.  
STORAGE  
ENGINE  
WARNING: Perform the following  
steps after each use:  
S Remove spark plug and pour 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 Allow engine to 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 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 the proper petrol to oil  
ratio.  
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.  
OTHER  
S Do not store petrol from one season to  
another.  
SEASONAL STORAGE  
Prepare unit for storage at end of 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 Replace your petrol can if it starts to rust.  
S Lightly oil external metal surfaces.  
15  
 
TROUBLESHOOTING TABLE  
WARNING: Always stop unit and disconnect spark plugbefore performingall of the  
recommended remedies below except remedies that require operation of the unit.  
TROUBLE  
CAUSE  
REMEDY  
Engine will not  
start.  
1. ON/STOP switch in STOP 1. Move ON/STOP switch to ON  
position.  
position.  
2. Engine flooded.  
2. See “Starting a Flooded Engine” in  
Operation Section.  
3. Fuel tank empty.  
4. Spark plug not firing.  
5. Fuel not reaching  
carburetor.  
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. Carburetor requires  
adjustment.  
6. Contact an authorised service dealer.  
Engine will  
not idle  
properly.  
1. Carburetor requires  
adjustment.  
2. Crankshaft seals worn.  
3. Compression low.  
1. See “Carburetor Adjustment” in  
Service and Adjustments Section.  
2. Contact an authorised service dealer.  
3. Contact an authorised service dealer.  
Engine will not  
accelerate,  
lacks power,  
or dies under  
a load.  
1. Air filter dirty.  
1. Clean or replace air filter.  
2. Clean or replace plug  
and regap.  
2. Spark plug fouled.  
3. Carburetor requires  
adjustment.  
4. Carbon build-up on  
muffler outlet screen.  
5. Compression low.  
3. Contact an authorised service dealer.  
4. Contact an authorised service dealer.  
5. Contact an authorised service dealer.  
Engine  
1. Choke partially on.  
1. Adjust choke.  
smokes  
2. Fuel mixture incorrect.  
2. Empty fuel tank and refill with  
correct fuel mixture.  
excessively.  
3. Air filter dirty.  
4. Carburetor requires  
adjustment.  
3. Clean or replace air filter.  
4. Contact an authorised service dealer.  
Engine runs  
hot.  
1. Fuel mixture incorrect.  
1. Empty fuel tank and refill with  
correct fuel mixture.  
2. Spark plug incorrect.  
3. Carburetor requires  
adjustment.  
4. Carbon build-up on  
muffler outlet screen.  
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: +46--36--146500, 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  
V of 2000/14/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 DATA SHEET  
MODEL: Mac 250 B  
ENGINE  
3
Cylinder displacement, cm  
25  
At maximum engine power, rpm  
Maximum rotational frequency of the spindle  
Engine speed at recommended maximum spindle  
rotational frequency  
Recommended speed idling, rpm  
Maximum engine power, measured in  
accordance with ISO 8893, kW  
Catalytic converter muffler  
8000  
10000  
7400  
3000  
0,7  
Yes  
IGNITION SYSTEM  
Spark plug  
Champion RCJ--6Y  
0,6  
Electrode gap, mm  
FUEL AND LUBRICATION SYSTEM  
3
Fuel tank capacity, cm  
340  
5,6  
WEIGHT  
Weight without fuel, cutting attachment and guard, kg  
NOISE EMISSIONS  
(see Note 1)  
Sound power level, measured dB(A)  
110,3  
114,0  
Sound power level, guaranteed L dB(A)  
WA  
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)  
Equipped with trimmer head (original)  
99,0  
98,5  
VIBRATION LEVELS  
(see Note 3)  
Equivalent vibration levels (a  
) at handles, measured  
hv,eq  
2
according to EN ISO 11806 and ISO 22867, m/s  
Equipped with grass blade (original), left/right  
Equipped with trimmer head (original), left/right  
4,4/6,9  
4,7/4,2  
Note 1: Noise emissions in the environment measured as sound power (L ) in conformity  
WA  
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  
2
(standard deviation) of 1 m/s .  
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.  
530 05 58 92 / 575 35 27 01  
Grass blade/grass cutter Grass (20 cm, 4--teeth)  
Trimmer head  
TNG7 (2,4 mm line)  
537 41 92--02 / 575 35 27 01  
18  
 

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