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USER MANUAL
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28,282
GAs STB'ruGTRIMMERS
t-
OPERATION
MAINTENANCE
SAFETY
Your new stringtrimmeris a complextool.
For your own safety, please read this
manual before attemptingto operateyour
new unit. Failureto follow instructions
can
resultin seriouspersonalinjury. Spend a
few moments to lamrlranze
tew
familiarizeyoursell
with
vourselfwrtn
your trimmerbeforeeach use.
PN 98587-04
1993 Printedin U.S.A
O U.S.A. . McCullochCorooration.
DearCustomer,
product'With
a McCullo-ch
Thankyou for purchasing
it willprovideyouwith
properoperationandmainienance
yearsof service,
ln orderto make the best use of your investment'be
yourselfwiththe contentsof the
CenfAtru to familiarize
to operateand
attempting
before
Manual
ENTIREUser
unit.
maintain
Your
illustrations
to
Be sure carefullyfollowthe step-by-step
in this manualto start,operateand maintainyour new
product.
NOTE'
call-outs:
ln themanualtherewillbethefollowing
WARRANTY'
and
WARNING/ CAUTION
to
information'
A NOTE:is usedto conveyadditional
a
step
expand
or
explanation,
particular
a
highlight
description.
GENERALINFORMATION. .
1 - . .. .| . . I n t r o d u c t i o n
1 - 2 .. . . A b o u t Y o u r M a n u a l
1-3.... AboutYourUnit
1 - 4 . . . . A s s e m b l YR e q u i r e m e n t s
1-5.... Specifications
. . . 3
GENERALIDENTIFICATION.
2-1. . .. Generalldentification
2-2. . .. Sd{etYFeatures
...4
SAFEWPRECAUTIONS.
3-1.... WhatToDo
. .. .. 5
3-2. . .. What NOTTo Do
ASSEMBLYINSTRUCTIONS
4 - 1. . . . H a n d l eA s s e m b l Y
4-2. . .. SparkArresterInstallation
4-3. . . . DebrisShieldInstallation
FUELANDLUBRICATION
5-1.... Fuel
...7
. .. ..8
5 - 2 . . . . M i x i n gF u e l
5-3.... FuelMixingTable
5 - 4 . . . . U s e O f B l e n d e dF u e l s
OPERATINGINSTRUCTIONS
6 - 1 . . . . S t a r t i n g A C o l dE n g i n e
6 - 2 . . . . T o S t o PT h e E n g i n e
6 - 3 . . . . W a r m E n g i n eS t a r t
...9
AWARNING
"..CAUTION
if not undertakenor if
procedurewhich,
ii"n1iti"" a
iniuryor
done,canresultin seriouspersonal
improperly
both'
and/or
damageto the unit
that
rn" @ (wARRANW sYMBoL) servesnotice
any
followed'
are
or procedures
unless instructions
be
will
repairs
and
warranty
voidthe
J.t"gt l"rted will
expense'
at owner's
be
Service other than user maintenanceshould
Center'
Service
Authorized
McCulloch
a
bv
o"rtormeO
product
b.t"g" or conditionswhich renderthis
practices
maintenance
improper
inop"iiuru causedby
warranty'
willvoidthe manufacturer's
McCullochCorPoratlon
nt
Product ServlceDePartme
TRIMMINGINSTRUCTIONS.
SafetyPrecautions
7-1. . . . Additional
LineRelease
7-2. . . . Stringhead
7-3. . . . TrimmingProcedures
11
13
MAINTENANCEINSTRUCTIONS
Maintenance
8-1. .. . Preventive
8-2. . . . RePlacingCutterLine
Stringhead
8-3. . . . Removing/Replacing
8-4. ...AirFilter
8 - 5 . . . . F u e l C a P / F u eFli l t e r
8-6. . . . CarburetorAdiustment
8-7....SParkPlug
8-8. . . . SParkArresterScreen
8-9. . . . DebrisShieldKnifeSharpening
8-10. .. StoringAUnlt
A UnitFromStorage
8-11. . . Removing
18
L U B R I C A N T.S. ' ' ' ' '
A C C E S S O R I&
ES
19
.
.
TROUBLESHOOTINGTHESTRINGHEAD
.
.
20
.
.
.
ENGINE
TROUBLESHOOTINGTHE
1 - 1 . I N T R OD U C T ION
1.3. ABOUTYOURUNIT
Your McCullochStringTrimmeris a light, portable, McCulloch
unitsare designedto meetall of your lawn
hand-held
unit,poweredby a 2-cycleengine,that runs and gardentrimmingneeds. When equippedwith a
coolandquiet.
yourunitcantrimunsightly
debrisshieldandstringhead,
weedsandtallgrassin thosehardto reachareas- along
Your unit featuresa recoil starterfor fast, consistent fences,walls,foundations
and aroundtrees.
startsand a precisiondiaphragmcarburetorfor smooth
operation.
1.4. ASSEMBLY REQUIREMENTS
A spark arresterscreenthat meets all U.S. Forest
ServiceRegulations
is furnishedin the user kit. For
additionalinformation
governinguseandreplacement
of
spark arresterscreensfor your unit, see Safety
Precautions
andAccessories
and Replacement
Partsin
thismanual.
Your unit will requireassemblyof some components
which were packedseparatelyfor shipping. Please
follow the directionsbeginningin Section4-1,
AssemblyInstructions.NEVERoperate your unit
withouta properlyinstalled
debrisshield.
1 - 2 . A B O U T Y OU RMA N U A L
Your User Manual is both a referenceand a service
handbook that provides you with safety precautions,
e a s y - t o - f o l l o wa s s e m b l y , f u e l , s t a r t i n g , o p e r a t i n g ,
trimmingand maintenanceinstructions.
1.5. SPECIFICATIONS
EngineType
Displacement
DryWeight...
FuefCapacity
DriveShaft Length
Handle
CuttingLine
CuttingSwath
Stringhead. . .
Carburetor .
lgnition
SparkPlug .
Drive
Air-cooled
,2-Cycle,ChromeCylinder
29 cc
9.9tbs.
24 oz.
44"
Delta
O.O8O
or 0.095"
15u
DuatLine Semi-Automatic
Feed
primer/Diaphragm
Type
Electronic
ChampionDJ8Jor Equivatent
Direct
2.1. GENERALIDENTTFICATION
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
1 1,
12,
13.
14.
15.
16.
STRINGHEAD
CUTTERLINE
DEBRISHIELD
DRIVESHAFTASSEMBLY
HANDLE
THRoTTLETRIGGER
IGNITIoNoN/oFF SWIToH
cHoKE LEVER
FANHoustNG
FUELTANK
A I RF I L T E R
coVER
STARTER
HANDLE
M U F F L E sRH t E L D
DRtvEsHAFTRETAINtNG
scREw
SPARKARRESTE
SR
CREEN*
PRIMER
BULB
\o
17. cRrP
WARNING CAUTION
BladesCANNOT be used on these models.
"Supplied in User Kit
2-2. SAFEW FEATURES
Numbers preceding the descriptions correspond with numbers above to help you locate the safety feature.
3
DEBRISSHIELDmustbe installed
to preventdeffi|rort spaytngup intothe operatorand prevent
the stringfromextendinglongerthannecessary.
13 uurrlen Sgtrlo hetps preventhands, body
and/orcombustiblematerialsfrom makingcontact
witha hot muffler.
The serialnumberof your unit is locatedon the
engine.For handyreference
purposes,
you may
want to recordthe serialnumberalongwith the
modelnumber. You may alsowantto etch your
own marking.
15
Spnnx nnReSfER SCneEru retainscarbonand
otherflammableparticlesover 0.023 inchesin size
from exhaust flow.
NOTE: Compliance with local, state and federal laws
and/or regulationsgoverningthe use of a spark arrester
screen is the user's responsibility. See Safety
Precautions(Section3) and MaintenanceInstructions
(Section8) for additionalinformation.
MODELNUMBER
PERSONAL
ETCHING:
SERIALNUMBER
3-1. WHATTO DO
READYOURUSEBMANUALANDALLSUPPLEMENTS(tF ANY ENCLOSED)THOR_
OUGHLY BEFORE OPERATINGYOIJR
UNIT.
1.
2.
WEAR CLOSE FITTING,TOUGH WORK CLOTHING
that will provideprotection,such as long slacks or trou_
sers, safety work shoes, heavy duty work gloves, a
safety face shield, goggles or safety glasses for eye
protectionand a good grade of ear plugs or other sound
barriersbr hearingprotection.
REFUEL lN A SAFE PLACE, Open fuet cap slowty to
retease any pressure which may have formed in fuel
tank. To prevent a fire hazard, move at least 10 Jeet
(3 meters)lrom fuelingarea before starting.
3.
l F F U E L H A S S P T L L E DO N U N I T , b e s u r e e n g i n e h a s
been dried completelybefore startingit.
4,
COMPLY WITH ALL
FIRE PREVENTION
REGULATIONS.We recommendyou keep a shoveland
fire extinguisherclose by whenever using your unrt in
areas where dry grass, leavesor other flammablemate_
rials are present,To operate a gasoline-poweredproduct on U.S. National Forest Lands or forest, brush or
grass-covered lands in many U.S. states - including
California,Maine,New Hampshire,Oregon,Washington
- you must have an approved spark arrester
screen
properlyinstalledand maintainedon the engine muffler.
The spark arresterscreen must removeand retaincarb_
on and other flammable particlesover 0.023 inches in
size from engine exhaust flow.
NOTE: COMPLIANCE WITH ALL LocAL, STATE, oR
F E D E R A LL A W S I N T H E U N I T E DS T A T E SI S T H E U S E R ' S
BESPONSIBILITY.Your unit comes with a sparK arresrer
screen furnishe?in the user kit. ReplacementsparKarrester
screen kits are availableat your nearest McCulloch
Authorized Service Center listed under .SAWS, in vour
TelephoneDirectoryYellowpages. lf you haveany questions
concerning spark arrester screens or their use, wrrte
to: McCulloch Corporation, product Service Depanment,
P.O. Box 11990,Tucson,Arizona85734. Or, vou can call our
toll-freenumber, USA: 1-800-423-6302. Arizonaresidents
call 1-800-221-6507.
NOTES:
5. TURNUNITOFF beforesettingit down.
6. ALWAYSHOLDUNITFIRMLYWITHBOTHHANDS.
thethumband f ngersencircling
the handles.
7.
KEEPALLSCREWS
AND FASTENERSTTGHT.
Never
operateyour equipment
when it is improperly
adjusted
or notcompletely
and securelyassembled.
8.
KEEP HANDLES DRY, clean and free of fuel mixture.
9.
K E E P S T R I N G H E A DA S C L O S E T O G R O U N D A S
P R A C T I C A LA. v o i d h i t t i n g s m a i l o b j e c t s w i t h
stringhead. When cutting on a slope, stand below
stringhead.NEVER cut or trim on a hill or slope, etc.. if
t h e r e i s t h e s l i g h t e sct h a n c eo f s l i p p i n g s, l i d i n go r l o s i n g
firm footing.
1 0 . C H E C KA R E A Y O U W I L L B E T R I M M I N GF O R D E B R I S
that may be struck or thrown during operation. Clear
area beforeoperatingequipment.
1 1 . K E E P A L L P A R T SO F Y O U R B O D Y A N D C L O T H I N G
AWAY FROM STRINGHEADwhen starting or running
engine. Before starting engine, make sure stringhead
will not come in contactwith any obstacle.
12. STOP ENGINE before examiningcutting line.
13. STORE EOUIPMENT AWAY FROM POSSIBLE
IGNITIONSOURCES,such as gas-poweredwater heaters, clothes dryers, or oil-firedfurnaces,portable heaters, etc.
14. ALWAYS KEEP the debris shield, stringhead,ano eng i n e f r e e o f d e b r i sb u i l d - u p .
1 5 . T U R N I G N I T I O NS W I T C HT O O F F a n d r e m o v e s o a r x
plug boot from spark plug to avord any chance of accidental startingbefore replacingstringheador line.
1 6 . O P E R A T I O N O F E O U T P M E NsTh o u l d a t w a v s o e r e strictedto mature and properlyinstructedindviduals.
SAFETYPRECAUTIONS
3
3
3.2. WHATNOTTO DO
WARNING
1.
DO NOTOPERATETHIS
EOUIPMENT
with otherpeople or animalsin the imrnediatevicinity.ALLOWa safe
distanceof at least30 feet (10meters)betweenoperator
and otherpeopleor animals.
2 . EDGINCJSCALPING
lS NOTRECOMMENDED
when
otherpeopleor animalsare within100feet.
3.
OO NOTSWEEPWITHUNIT.Sweepingrefersto tilting
headattachmentto sweepawaydebrisfrom sidewalks,
driveways,etc.
4.
tlfh oo NoT usE ANy orHER FUEL than that rec\llommended in your nnnual.Alwaysfollowinstructionsin the Fueland Lubrication
sectionof this manual.
Never use gasolineunlessit is properlymixedwith
2-cycleenginelubricant.Permanentdamageto engine
will result,voidingmanufacturer's
warranty.
5 . D O N O TO P E R A T E Q U I P M E N T w e a r i n g l o o s e
scarves,shorts,danglingjewelry,key chains,etc.,or
whilebarefoot.
6.
OONOTSMOKEwhile refuelingor operatingequipment.
7.
DO NOTSTARTEOUIPMENT
WHEREYOUFUELIT,
Move at least 10 feet (3 meters)from fueling areas
beforestarting.
L
DO NOTOPERATEUNITWITHOUT
A MUFFLERand
properlyinstalledmufflershield.
9.
OONOTTOUCHor let your handsor body come in
contactwith a hot mlffler or sparkplugwire.
1 0 . DO NOTALLOWDIRT.FUELOR DEBRISto builduo
on engrne.
POS|IIONS,
1 1 . DO NOTOPERATEUNITlN AWK\TVARO
arms,or one-handed.
Always
otf balance,outstretched
use two handswhen operatingunit with thumbsand
fingersencircling
the handles.
12. DO NOT USE STEEL LINE OR PLASTIC-COATED
STEELLINE.The use of steel line or plastic-coated
steel line is extremelydangerous.Your stringheadis
designedto be usedwith .080or .095"diameternylon
line.
aboveknee levelwhile
1 3 . DO NOTRAISESTRINGHEAD
lnjuryto operatorcouldresult.
unitis operating.
1 4 . DO NOT USE ANY TYPE BLADE OR SAW CHAIN
or included.
CUTTERHEADunlesssoecified
OTHER
1 5 . DO NOTUSEUNITFORANY PURPOSES
thantrimmingor mowingweedsor grass.
FORPROLONGED
PERIOOS,
1 6 . DONOTOPERATEUNIT
Restperiodically.
1 7 . D O N O T O P E R A T EU N I T W H I L E U N D E RT H E
INFLUENCE
OFALCOHOLOR DRUGS.
1 8 . DO NOT OPERATEUN]T UNLESSDEBRISSHIELD
A N D / O RG U A R DI S I N S T A L L E DA N D I N G O O O
CONDITION.
19. 1fhoo Nor ADD, REMovE oR ALTER ANY
\ l / c o u p o N E N T s o F T H t s p R o o U C T .D o i n g s o
could cause personalinjuryand/ordamagethe unit
voiding the rnanufacturer's
warranty.
CAUTION
Extremelylong hair may be drawnintothe engineby the coolingfan.
Ensurelong hair is protectedand kept clearof the coolingfan intake
area.
4.1. HANDLEASSEMBLY
INSTALLIN ORDER SHOWN
NOTE: The Deltahandleis attachedto the shaftbut has
been turnedunder for ease of packing.
>
:-@SCREEN
\K-
-COVER
\
Figurerl-2B
4.
To 8-112'
6-112"
Figure z1-1A
1 . Loosen adjustmentknob and rotate handle to top of
shaft. (Figure4-1A)
2.
Retightenadjustmentknob securely.
Install the spark arrester screen, the screen cover
and scure in place with the retainingscrew.
(Figure4-28)
NOTE: A dirty spark arrester screen can dramatically
reduceperformance.
4.3. DEBRISSHIELDINSTALLATION
WARNING
The debrisshieldmust be installedto properlydispense
cutterline and protectoperator.
4.2. SPARK ARRESTERINSTALLATION
@ ""Qg
NOTE: Spark Arrester is required when using your
trimmeronU.S. NationalForestLands. Checkvourlocal
state requirements.
1 . Placeyour uniton a work benchor levelsurfacewith
the mufflerfacingyou as shown in Figure4-2A.
\ - scREw
FigurezL3A
2. Accessto the screenarea can be made throughthe
openingon the back of the mufflershield. lt is not
necessafoto remove the muffler shield to installthe
screen.
Figure4-38
REMOVE
SCREW
Figure4'2A
3. Usinga screwdriver,removethe screencover
tainingscrew.(Figure4-2A)
Figure4-3C
5.1. FUEL
Enginefuelis a mixtureof gasoline
and2-cycleoil. The
correctratioof gasolineto oil is very important.Follow
the ratiosin the FuelMixingTable.
Use regulargrade unleadedgasolinemixed with
McCulloch40:1 custom2-cycleengineoil for best
results.Usemixinoratiosin Section5-3.
CAUTION@
gasoline
Neverusestraight
inyourunit.Neverusea fuel
mixturethat hasbeenstoredfor over90 days. Thiswill
c a u s e p e r m a n e n te n g i n e d a m a g ea n d v o i d t h e
manufacturer's
warrantyfor that product.
GAUTTON
@
oil in
Neverattemptto mixthe gasolineand lubricating
thefueltankof the unit.
SpecialstartingfluidsSHOULDNOT be usedbecause
parts may be
seals and other rubbercomposition
damaged.
5.3. FUEL MIXING TABLE
GASOLINE
1 / 2 U . S .G a l .
1 U . S .G a l .
2.5 US Gal.
5 U.>.(:at.
1 . 6o z .
3,2oz.
8.0oz.
1 6 . 0o z .
48 ml (cc)
95 ml (cc)
237 ml (cc)
475 ml (cc)
1 Liter
5 Liters
20 Liters
0.9oz,
4.3oz.
1 7 . Oo z .
25 ml (cc)
125ml (cc)
500 ml (cc)
1 lmp. Gal.
2 l m p .G a l ,
5 l m p .G a l .
4.3 oz.
8.6 oz.
2 1. 4 o z .
125 ml (cc)
250 ml (cc)
52s ml (cc)
CAUTION@
lf 2-cycle lubricant other than McCulloch Custom
Lubricantis to be used, it must be a premium grade
2-cycleoil mixedat a 40:1 ratio. lf insufficientlubrication
is the cause of engine damage, it voids the
manufacturer's
warrantyfor that product.
5-2. MIXINGFUEL
McCulloch 40:1 Ratio Custom Lubricant
Mixing
Procedute:
40 Part3 Gasoline to 1 Part Lubricant
1ml =lcc
Mix fuel in a containerequippedwith a flexiblespoutand
strainer. See the Fuel MixingTable for the correctratio
of gasolineto oil. Pour half of the gasolineand all of the
oil into the container. Cover the containerand shake
vigorously.Add the rest of the gasolineand againshake
containerto thoroughlymix fuel and oil.
Ihe use of a fuel additivesuch as STA-BILoGas Stabilizer
or an equivalentwill mrnimizethe fornntion of fuel gum
deposits.Such an additiveshouldonly be used when the
fuel/oilmix rs prepared. Add 11 ml I 0.4 oz. per gallonof
gasolineor mix per instructrons
on container.NEVERadd
fuel additivesdirectlyto the unit fuel tank.
5 . 4 . U S E O F B L E N D E DF U E L S
Today'sfuelsare oftena blendof gasolineand one or moreoxygenates
MTBE(ether)
suchas ethanol,methanol,
andaxonal.Theseblendsareoftenreferred
to as gasohol,premiumor superunleaded.
We recommend
product.However,if you chooseto use a
regularunleadedgasolinefor use in yourMcCulloch
blendedfuelor its use is unavoidable,
precautions
thefollowing
arerecommended.
1 .Always use fresh fuel mixed peryou r
User Manual.
a.
Use the specialadditiveALCOHOL
PROTECiOR'o 1by cold Eagle) or
equivalentto inhibit conosion and
reduce oiltfuel separation (mix as
directed).
Always agitate the fuel mix before
fuelingunit.
Defueltank and run enginedry before stonng the unit.
PROBLEMS
COMMON
TO
BLENDEDFUELS
GASOHOLUSEMAYREQUIRE
CARBURETOR
ADJUSTMENTS
Someoroblemsassociated
withuseof
blendedfuelsinclude:
. Vaoorlock
by
YourMcOulloch
engineis lubricated
oil mixedwith the fuel. Using
oxygenated
fuelsmayalterthe airlfuel
more
ratiocausing
a leanmix(lessfuel,
atr).
. Poorwarmrestart
. Poorperformance
at highaltitudes
. Corrosron of
corDonentS
fuel svstem
lf this conditionis not correctedby
a d j u s t i n gt h e c a r b u r e t o re, n g i n e
darnagedue to poor lubricationrnay
r e s u l t .Y o u r M c C u l l o c hA u t h o r i z e d
S e r v i c eC e n t e r c a n m a k e t h e s e
adjustments.
6-1. STARTINGA COLD ENGINE
NOTE: lgnitionis always"ON"
F i g u r e6 - 1 D
NOTE: To minimizeload on engineduringstartingand
warm-up, trim excess cutter line to 5 inches. (Figure
6-1A)
3.
Squeezethe triggerto the FULL THROTTLE
position.(Figure6-1D)
Your unit is designedwith a 3 positionchoke;
"CHOKE" , 'START'. and "RUN".
F i g u r e6 - 1 E
F i g u r e6 - 1 8
4.
TO START ENGINE
1. Move choke leverto "CHOKE" position.
( F i g u r e6 - 1 8 )
Pull starterrope out a short way until resistanceis
lelt (approx.4 inches). Pull starter rope briskly4
times. A smooth rapid pull is requiredfor a strong
s p a r k .( F i g u r e6 - 1 E )
NOTE: Throttlemust remainin fullthrottlepositionuntil
enginestartsand warms up (approx.10 seconds).
PRIMER
Figure6-1C
2. Primethe carburetor.Pumpthe primerbulb 10
times.(Figure
6-1C)
t-{
5.
Move choke leverto "START" position.pull starter
rope again 4 tirnes while holdingtrigger at the full
throttle position.(Figure6-1F)
6.
lf enginefails to start,repeatsteps 1 through5.
a
6
NG INSTRUCTIONS
OPERATI
6
6-2. TO STOPTHE ENGINE
NormalStopping:
Flgure 61G
Figure 6-2A
7. Onceengineslarts,leavethechokeinthe"START"
positionfor 10 seconds,then move choketo "RUN"
1. Releasethrottletrigger. Let engine returnto idle.
position. (Figure-6-1G)
Extend stader rope 4"-6" to absorb strain on starter
componentswhen engine stops. Push and hold
ignition stop switch until engine stops. Allow starter
rope to retract slowly. (Figure 6-2A)
6.3, WARMENGINESTART
Flgure6-3A
NOTE: Your unit is equippedwith a throttleadvance
(Figure6-1H)
whichalsocan be usedduringstarting.
1. Placechokein "START"position.
(Figure6-3A)
NOTE: lf enginefailsto start,afterrepeatedattempts,
2. Graspthrottlehandlefirmly,squeezethrottletrigger
referto Troubleshooting
section.
to FULLthrottleposition.
NOTE: Always pull starterrope straightup. Pulling
starterat an anglewill cause rope to rub againstthe 3. Pull starterrope brisklyuntil enginestarts,but no
eyelet. This frictionwill cause rope to fray and wear
morethan 6 times. Keepthrottleat FULLposition
quickly.Alwaysholdstarterhandlewhenroperetracts.
untilenginerunssmoothly.
Neverlet ropesnap backfrom extendedposition.This
4. lf enginedoesn'tstart,placechokein "RUN" posicouldcauseropeto snag or fray and also damagethe
tionandpullstarterrope5 moretimes. lf enginestill
starterassembly.
doesnotstartit is probablyflooded.Wait5 minutes
andrepeatprocedure
withchokein "RUN" position
andthrottlefullopen.
t0
7-1 . A D D I T I ON A L
S A F E W P R E C A UTIONS
Beforeoperatingyour unit, review ALL SAFETYPRE)AUT\oNS in this manual.
WARNINGCAUTION
lF UNFAMILIARWITHTRIMMING/CUTTING
techniques, practicethe procedureswith ENGINE in
'OFF'position.
ALWAYSCLEARWORK areaof debrissuchas cans,
bottles,rocks,etc. Strikingobjectscan causeserious
injuryto operatoror bystandersand also damage
equipment.lf an objectis accidentally
hit,immediately
TURN ENGINE OFF and examineequipment. lf
stringheadis cracked or broken,or plasticdebris
shieldis damaged,replacethose partsimmediately.
Neveroperateunitwith damagedor defectiveequipment.
ALWAYSHOLDUNITFIRMLYwith both hands.
thumbsand fingersencircling
handles.
ALWAYSWEARPROPERCLOTHING,work shoes,
work gloves,safety gogglesand ear protectionto
guardagainsthearingimpairment,
ALWAYSTRIMOR CUTAT HIGHENGINESPEEDS.
Do not run engineslowlyat start or duringtrimming
operations.
DO NOT use equipment for purposes other than
trimmingor mowingweeds.
NEVERraise stringheadabove knee height during
operation.
DO NOT operateunitwith otherpeopleor animalsin
the immediatevicinity. Allow a minimumof 30 feet
betweenoperatorand otherpeopleand animalswhen
trimmingor mowing. Allow a distanceof 100 feet
betweenoperatorand otherpeopleand animalswhen
EDGINGor SCALPING
withstringhead.
NEVEROPERATEEQUIPMENT
if taking medication
that producesdrowsinessor reducesreflexes.
NEVEROPERATEEQUIPMENT
while drinkingalcoholicbeverages
or whileunderthe influenceof alcohol
or drugs.
lF OPERATING
UNITON A SLOPE,stand below the
cuttingattachment.DO NOT OPERATEon a siope
or hillyinclineif thereis the slightestchanceof slipping
or losingyourfooting.
7-2 . S T R I N G HE A D
L IN ER E L E A S E
CAUTION
Periodicallyremove weed wrap to prevent overheatingthe
drive shaft. Weed wrap occurs when strands of weeds
become entangled around the shaft beneath the debris
shield (Figure7-28). Removeweed wrap with a screwdriver
or similardevice,or referto Section8-3, Removing/ Replacing Stringhead.
Figure7-2A
NOTE: The bump-and-feed
stringheadallowsfor quick
and easylinefeedingwithoutthe needto stopengineto
advanceline.(Figure7-2A)
WARNINGCAUTION
DO NOT use steelwire or plastic-coated
steelwire.
To releasefresh line, run engine at full throttleand
"bump"stringheadagainstlawn. Linewill automatically
'Fiqure
'Y-'- 7-28
release.The knifein debrisshieldwilltrim excessline.
11
7
TRIMMINGINSTRUCTIONS
7 . 3 . T R I M MIN GP R OC E D U R E S
When properlyequippedwith a debris shield and
stringhead,your unit will trim unsightlyweeds and tall
grassin thosehard-to-reach
areas- alongfences,walls,
foundationsand aroundtrees. lt can also be usedfor
edgingalongwalkwaysand driveways.And it can be
used for scalpingto removevegetationdown to the
groundfor easierpreparation
of a gardenor to cleanout
a particular
area.
7
WARNING
Use extremecautionwhen EDGING or SCALPING.
Keep a distanceof 100 feet betweenoperator,other
peopleand animalsduringtheseoperations.
EDGING
Tilt unitto the leftso that
stringheadis in a vertical
position.This will allow
the nylonline to sklm
a l o n gt h e e d g e o f t h e
Before
concrete.
edging,you may wantto
Do not use steelwire or plastic-coated
steelwireof any
adjustthe handleso as
kind with your stringhead.Seriousoperatorinjurycan
to makethisoperationas
result.
effortlessas possible.
keep a distance
Always
NOTE: Evenwith care,trimmingaroundfoundations,
100
feet from other
of
brickor stonewalls,curves,etc.,will resultin above
people
animalswhen edging. Do not attemptthis
and
n o r m a l s t r i n g w e a r . T o r e l e a s ef r e s h l i n e , s e e
procedure
if
thereis anychanceflyingdebriscouldinjure
instructions
in Section7-2,Stringhead
LineRelease.
operator,otherpeopleor causedamageto property.
TRIMMING/MOWING
SCALPING
Swing trimmerwith a
Scalping refers lo
sickle-likemotionfrom
all
removal of
sideto side. Do nottilt
to
the
vegetation
down
the stringheadduring
ground.To do this,tilt
the procedure. Test
to about
the
stringhead
area to be trimmedfor
a 30 degreeangleto
proper cutting height
the left. By adjusting
K e e p s t r i n g h e a da t
t h e h a n d l ey o u w i l l
same level for even
have bettercontrol
depthof cut.
duringthis operation.
CLOSEB TBIMMING
Always keep a
Positiontrimmerstraightaheadwitha slighttiltso bottom d i s t a n c eo f 1 0 0 f e e t
of stringheadis abovegroundand stringcontactoccurs from otherpeopleand
when
at propercuttingpoint. Alwayscut awayfrom operator. a n i m a l s
if thereis any
Do
not
attemptthis procedure
scalping.
Do not pulltrimmerin towardoperator.
otherpeople
chanceflyingdebriscouldinjureoperator,
FENCE,trOUNDATI ON TRIMMIN G
or causedamageto property.
WARNING
Approachtrimmingaround chain link fences,picket
fences,rock walls and foundationsslowlyto cut close
withoutwhippingstringagainstthe barrier. lf the string
comesin contactwithrock,brickwalls,or foundations,
it
will breakor fray. lf stringsnagsfencing,it willsnapoff.
TRIMMINGAROUND TREES
Trim aroundtree trunkswith a slow approachso string
does not contactthe tree bark. Walk aroundthe tree
trimmingfromleftto right.Approachgrassorweedswith
tip of stringand tilt stringheadslightlyforward.
12
WARNING
DO NOTSWEEPWITHTRIMMER
Sweepingrefersto tilting stringheadto sweep away
debrisfrom walkways,etc. Your trimmeris a powerful
tooland smallstonesor othersuchdebrismaybe hurled
50 feet or more, causinginjuryor damageto nearby
propertysuchas automobiles,
homesand windows.
8.1. PREVENTIVE
MAINTENANCE
A good preventivemaintenanceprogramwill prolongthe
lifeandmaintainthe performance
of yourMcOulloch
unit.
Service other than routine user maintenanceitems
should be performedby your McCullochAuthorized
ServiceCenter listed in under "SAWS"in the Yellow
Pagesof yourtelephonedirectory.
Afterthe first7 daysor 15 hoursof operation,
whichever
comeseadiest,takeyourunitto yourMcOulloch
Authorized Service Center for an inspectionand check-up.
Yourdealerwill be pleasedto helpyou set up a prevenprogramto suityour needs. The rective maintenance
ommendedfirst 7-day or 1S-hourcheck-upsand a
follow-upof regularperiodiccheck-upsandtune-upswill
assure long, satisfactoryservicefrom your McCulloch
product.This servicewill be performedat your McCullochAuthorizedServiceCenterat existingservicerates.
Keepyour unit clean. Do not allowfilters,muffferand
cylinderfins to becomepluggedor coveredwith dirt or
debris.
fi[ Neveruse dirtyfuel or dirty oil. Enginedamage
\lf could result. Alwaysfollowinstructionsin the Fuel
and Lubrication
sectionof this manual.
MAINTENANCE
CHECKLIST
NOTE: The maintenance
checklistbelowis a guidefor preventivemaintenance.Cleaning,adjustment,
and parts
replacement
may, undercertainconditions,
be requiredat morefrequentintervalsthanthoseindicated.
5
20
MAINTENANCECHECKLIST
H
ITEM
SCREWS/ NUTS/BOLTS
CONTROLS
AIR FILTER
F U E LF I L T E B
D E B R I SS H I E L D
STRINGHEAD
ACTION
U
R
S
U
R
S
lil
rI
CLEANOR REPLACE
REPLACE
INSPECT
R E P L A C E A SR E Q U I R E D
INSPECT
R E P L A C E A SR E Q U I R E D
CLEAN/ADJUST/FEPLACE
*CLEANTADJUST
EXHAUSTPORTS
*CLEAN
C Y L I N D E BF I N S
CARBUFETOR
o
INSPECT/ TIGHTEN
INSPECT
TFEPLACE
AS FEQUIFED
SPARKPLUG
MUFFLER
LAMINATIONGAP
SPARKARFESTERSCBEEN
H
o
TCLEAN
a
INSPECT
REPLACE
TCLEAN
.CLEAN
STARTERROPE
INSPECT
*REPLACEAS REOUIRED
DRIVESHAFT
TLUBRICATE
(Every50 Hours)
FUELHOSES
INSPECT
*REPLACEASREOUIRED
a
a
a
tFlecommended
for Maintenanceby a McCullochAuthorizedServiceCenterTechnician
13
8
MAINTENANCEINSTRUCTIONS I
8.2. REPI.ACINGCUTTERLINE
Figure8-2D
Figure8-2A
1. Turnthe knobCOUNTERCLOCKWISE
and remove
it. lf requireduse stringheadwrench.
2. Removethe spoolandspring.
6. Lock each end into a slot on oppositesidesof the
spool. Installthe spring over the spindle. Insert
eachendof the linethroughan eyeletin the housing
and lowerthe spool into the housingwhilefeeding
the linethroughthe eyelets.Ensurethe springseats
itselfintothe spool.(Figure8-2D)
3. Removeany remainingcutterline.(Figure8-2A)
HAND
TIGHT
ONLY
DO NOT
USE
WRENCH
Figure8-2E
4. Doublea 18ft. lengthof .095 (or .OB0)cufterline.
Threadeachendthroughoneof thetwo setsof holes
on the top of the spool. Pull both ends evenly
throughthe holes.(FigureB-28)
7. Once the spool is in place,apply pressureon the
the spring. Pull eachend of the
spoolcompressing
linesharplyto unlockthemfromthe slots. Continue
to applypressureto the spooluntilthe knobcan be
threadedCLOCIQVISEonto the spindle. Tighten
the knobsecurelyby handonly. DO NOT USETHE
WRENCHTO T]GHTEN.
STRINGHEAD
(Figure8-2E)
NOTE: Apply an anti-seizecompound(Permatex@
'133AAnti-seize
or equivalent)
to thethreadsto makethe
knobeasierlo removenexttime serviceis required.
Figure8-2C
5. Wind both ends around the spool together in a
CLOCKWISEdirectionto within6" of the ends. DO
NOTTWISTUNE ON SPOOL. Twistinglinecould
causestringheadto feed improperly.(Figure8-2C)
14
Flgure8-2F
5 inches.This
8. Trimthe excesslineto approximately
will minimizeload on engine during starlingand
warm-up.(Figure8-2F)
I
MAINTENANCEINSTRUCTIONS 8
8-3. REMOVING/ REPI-ACING
STRINGHEAD
Figure8-48
Figure&3A
1. Turn the knob COUNTERCLOCKWISE
to remove.
Usethe stringheadwrenchif required.
2. Removethe spooland springfromthe housing.
3. Removethe housing.Gentlytap backof housingto
loosen.(Figure8-3A)
2. LiftfilterfromAir Box. (Figure8-4B)
3. Washfilterin soapand water.DO NOT USE
GASOLINEI
4. Air dry filter.
5. Reinstallfilterin reverseorderof removal.
NOTE: Replacef lterif frayed,torn,damagedor
unableto clean.
_? o*
HAND
TlGHT
ONLY
8.5. FUELCAP/FUELFILTER
OO NOT USE
STRINGHEAO
WRENCH
Figure8-3B
4. Removethe replacement
stringhead
fromthe package intact. Placeit on the spindle.Ensurethe hex
on the spindleis well seatedintothe housing.
5. Compressthe'spoolintothe housingandthreadthe
knobintothe assembly.Tightenthe knobCLOCKWISE,BY HANDONLY.(Figure8-38)
84. AIR FILTER
CAUTION
Removefuel from unit and storein approvedcontainer
beforestartingthis procedure.
FUEL.AP
\
Figure8-5A
htu
t--<
NOTE: Keepvent on fuel cap cleanof debris.
(FigureB-5A)
To CleanAir Filter:
AIR FILTER
COVERSCREWS
AIR FILTER
COVER
FUEtFILTER
Figure8-4A
1. Remove2 screwsholdingairfiltercoverin placeand
removecover.(Figure8-4A)
1. Liftfuellineoutoftank.Steelwirewith
hookorpaper
clipworkswell.(Figure8-5B)
15
MAINTENANCEINSTRUCTIONS I
8
CENTER
ELECTRODE
SIDE
ELECTRODE
Figure &5C
2. Pulloff with a twistingmotion.(Figure8-5C)
3. Replacefuelfilter.
NOTE: Neveroperatethe trimmerwithoutthe
fuel
filter.Internalenginedamagecouldresult!
Figure 8-7B
@
4. Adjustgapto .025in. Bendsideelectrodeonlyusing
a gappingtool. (Figure8-78)
8-6. CARBURETORADJUSTMENT
5. Reinstallsparkplug and torqueto 105 to 130 inch
pounds. Reconnectsparkplug boot.
The carburetorwas pre-set at the factoryfor optimum
performance. lf further adjustmentsare necessary,
pleasetake your unitto the nearestMcOullochAuthorizedServiceCenterlistedin the YellowPages.
8-7. SPARK PLUG
8€. SPARKARRESTERSCREE N
NOTE: lt is not necessaryto take mufflershield off to
replaceor installa new sparkarresterscreen.
SPARKPLUG
BOOT
REMOVE
SCREW
Figure8-7A
Figure 8-8A
1. Removesparkplugbootwitha twistand pullmotion.
(Figure8-7A)
2. Removethe sparkplug.
SCREEN
3. Cleansparkplugelectrodeswith emerycloth.
Flgure&88
1, To replacesparkarresterscreen, removethe retaining screw and screen cover. Discard old screen.
Installnew screen.(Figure8-8A & 8-88)
16
8
MAINTENANCEINSTRUCTIONS I
8 . 9 . D EB R I SS H IE L DK N IF ES H A R PENING
1. Removecutterknifefromdebrisshield.
2. Placeknifein a benchvise. Sharpenknifeusinga
flatfile,beingcarefulto maintainthe angleof cutting
edge. Filein one directiononly.
Figure8-10A
B. Pour 1 teaspoonof clean 2-cycleoil into the combustionchamber. Pull starter rope slowly several
times to coat internalcomponents.Replacespark
plug.(Figure8-10A)
9. Store unit in a cool,dry placeawayfrom any source
of ignitionsuchas an oil burner,waterheater,etc.
8.11. REM OVING
A UNITFROM
STORAGE
Figure8-9A
3. Reinstallknife. Tightenfastenerssecurely.
(FigureB-9A)
8.1 0 . S T O R IN GA U N IT
fi[Failure to followthesestepsmay causevarnishto
\l/form in the carburetor,difficultstartingor permanentdamageafterstorage.
1. Performall thd generalmaintenance
recommended
in the Maintenance
Sectionof your UserManual.
1. Removesparkplug.
2. Pull starter rope brisklyto clear excess oil from
combustionchamber.
3 . Cleanandgap sparkplugor installa newsparkplug
with propergap.
4.
Prepareunitfor operation.
5 . Fillfueltankwithproperfuel/ oil mixture.See Fuel
and Lubrication
Section.
2. Cleanexteriorof engine,driveshaftassembly,debrisshieldand stringhead.
3. Drainfuelfromthe fueltank.
4. Afterfuel is drained,startengine.
5. Run engineat idle until unit stops. This will purge
the carburetorof fuel.
6. Allowengineto cool (approximately
5 minutes),
7. Usinga sparkplugwrench,removethe sparkplug.
l7
FOR PERFOBMANCEAND SAFETY REASOA'SUSE ONLY GENUINE
McCULLOCH ACCESSORIESAND BEPIACEMENT PABTS.
D ES C R IP T ION
PARTNUM BER
ACCESSORIES
and REPLACEMENT
PARTS
DualUne Stringhead
Assembly . .
Dual Line-on-Spool
BumpKnob
BumpSpring
Spark Plug DJSJ
Air Filter
D e b ri sS h i e l d
SparkArresterScreen
Fuel Filter
300160
3001s9
300339
3003s6
21904341
300323
22397541
224040
21698s
LUBRICANTS
3.2 oz. ONE SHOT
8 oz. (for 2.5 gal. mix)
16 oz. (with easy mix chamber)
18
22325141
224477
98463
PROBLEM
P R O B A B L EC A U S E
Lineis tangledinsidestringhead.
Remove spool from unit;
disassemble.Untangleline and
windcorrectlyin directionindicated
on spool(seeSection8).
Uponremovingspool,lineappears Trim off damagedline and rewind
to be meltedtogether.
line (seeSectionB).
Linewon'tfeed.
Removespool. Check to be
L i n e w o u n d i n w r o n g d i r e c t i o n certainline is wound in direction
insidestringhead.
indicatedon line element.(see
Section8)
Insufficient
lineinsidestringhead.
Removespooland installnew line
(seeSectionB).
I n t e r n a ld a m a g e t o s t r i n g h e a d D i s a s s e m b l es t r i n g h e a da n d
causedby bumpingheadtoo hard e x a m i n e p a r t s f o r d a m a g e .
Replacepartsor entirehead (See
on groundwhileadvancing
line.
Section8).
Linesnapsoff or frays.
lmpropertrimmingprocedures,or
poorqualityline.
SeeGeneralTrimmingInstructions
or replaceline (seeS6ctionB).
Unableto removestringhead
knob.
Stringheadknob over tighteneduse stringheadwrenchsuppliedin
userkit.
U s e a n f , is- e i z e c o m p o u n d
(Permatexw
133A Anti-sdize or
e q u i v a l e n t )a n d r e i n s t a l lk n o b
HANDTIGHTONLY.
Stringhead
and shaftare hotto the
touch.
Weedwrap.
Remove weed wrap (see
S e c t i o n7 ) .
l9
PROBLEM
CAUSE
PROBABLE
Unit won't start or starts but will not Incorrectstarting Procedures
run.
ACTION
CORRECTIVE
F o l l o w i n s t r u c t i o n si n t h e U s e r
Manual(SeeSection6).
l n c o r r e c t c a r b u r e t o r m i x t u r e Have carburetor adiusted bY an
AuthorizedServiceCenter.
adjustmentsetting
Fouledsparkplug
Remove,cleanand gaP (or rePlace)
spark plug. lf plug is wet, reinstall
plug and hold at full throttleuntilunit
starts. lf plug is dry,try startingwith
chokeon (SeeSection8).
Fuelfilterplugged
Replacefuelfilter(SeeSectionB)'
Unitstarts,butenginehaslow power. Incorrectleverpositionon choke
Moveto RUN position.
Dirtysparkarrestorscreen
Replacesparkarresterscreen.
Dirtyair filter
Remove,cleanand reinstallfilter.
l n c o r r e c t c a r b u r e t o r m i x t u r e Have carburetor adiusted bY an
AuthorizedServiceCenter.
adjustmentsetting
Enginehesitates
No powerunderload
l n c o r r e c t c a r b u r e t o r m i x t u r e Have carburetor adjusted bY an
AuthorizedServiceCenter.
adjustmentsetting
Clean/ gap or replacePlug.
Runserratically
gappedsparkPlug
Incorrectly
SmokesexcessivelY
l n c o r r e c t c a r b u r e t o r m i x t u r e H a v e c a r b u r e t o ra d i u s t e db Y a n
AuthorizedServiceCenter.
adjustmentsetting
lncorrectfuel mixture
Use properlymixedfuel (40:1
.
mixture)
AUTHORIZED
THE NEARESTMCCULLOCH
FOR WARRANW OR SERVICECONTACT
''SAWS' IN YOURTELEPHONEDIRECTORY
SERVICECENTERLISTEDUNDER
YELLOWPAGES.
HOT LINE'
CALLTHISTOLL-FREE
IS REQUIRED
IF FURTHERASSISTANCE
YOURMODELAND SERIALNUMBER'
PLEASEREFERENCE
1€00423-6302
ln Arizona:
1-800-221-6s07
M-F6:00AM- 4:45PM(MST)
/u
ASSEMBLYQUICK REFERENCE
FOLLOW THESE SIMPLESTEPSTO ASSEMBLEYOUR TRIMMER
REFERTO YOUR USERMANI.JALFOR MOREDETAILEDINSTRUCTIONS
A.
INSERT
EOLT
D EB R ISS H IE L D
ACTUAL
SIZE
Locatebolt and nut. Set debrisshieldin place. Installboltand nut,then tighten
B.
DELTA HANDLE
c.
distancefromthe rear
Loosenxnoo
:;"
handteto thetop Adfustto a comfortable
"noknob.
gripandtighten
J . HA.I.IDLE
distancefrom
Loosenthe screwsslightlyand rotatethe handleto the top a comfortable
the reargrip. Tightenthe screws.
B E F O R ES T A R T I N GE N G I N E : F u e l u s e d i n t h i s m a c h i n e m u s t b e m i x e d w i t h
McCullochCustomLubricantat 40:1 mix ratio(3.2oz. oil to 1 gallongasoline).
O U S A - McCullochConcoration
Pnntedrn USA
211373
ltt.
CONSULTARAPIDA PARA EL ENSAMBLAJE
SIGA ESTOSSIMPLESPASOSPARA ENSAMBI.ARSU RECORTADORA
SI DESEA
EN EL MANUALDELUSUARIO
CONSULTE
EN MASDETALLE
INSTRUCCIONES
C ON T R AE S C OM BROS
PR O T EC T OR A
@"k2
l1
1l
INTRODUZCA
ELPERNO
APRIETE
en su lugar Ins tal e
a
aescombr os
L o c a l i c e l p e rn oy l a tu e rca .C o loquela pr otectorcontr
e l p e r n oy l a tu e rca ,y a p ri e te
M AN I J AD E L T A
Af l o j el a p e ri l l ay g i re l a ma n i l ahastaar r iba Ajustea una distanciacomodadel agar r e
y aprietela perilla
trasero
M AN I J AE N J
y gir ela m anijahaciasu posicionsuper iora, una d i s tanc i a
Af l o j el osto rn i l l o sl i g e ra me n te
c o m o d ad e l a g a rretra se ro .A p r ietelos tor nillos.
AN T ESD E A R R A N C A RE L MOTOR: el com bustibleusado en esta mAquinadebe
estarmezcladocon el lubricanteCustomLubricantde McCullocha una raz6nde mezcla
de 40:1 (236 ml de aceitepor 10 litrosde gasolina- 3.2 onzasde aceitepor 1 galonde
g a s o l i na ).
O U.S A - McCullochCorooratron
Printedin USA
211373