McCulloch mac 3214 User manual

SERVICEMANUALMcCULLOCHMcCULLOCH
Model
EagerBeaver2010,
Mac3210
SilverEagle2012
EagerBeaver2014,
Mac3214,
SilverEagle2014
EagerBeaver2016,
Mac3216,
SilverEagle2016
Bore
36mm
(1.4in.)
36mm
(1.4in.)
36mm
(1.4in.)
36mm
(1.4in.)
Stroke
30mm
(1.2in.)
30mm
(1.2in.)
30mm
(1.2in.)
30mm
(1.2in.)
DispL
32cc
(2.1cu.in.)
32cc
(2.1CU.in.)
32cc
(2.1cu.in.)
32cc
(2.1CU.in.)
Drive
Type
Direct
Direct
Direct
Direct
MAINTENANCE
SPARKPLUG.Recommended
sparkplugisChampionDJ7Yorequiv-
alentforallmodels.Sparkplugelec-
trodegapis 0.025 in.( 0.6mm) forall
models.Notethatsparkplughasa ta-
peredseatanddoesnotrequirea gas-
ket.Tightensparkplugto150in.-lbs.
(17N.m).
CARBURETORAZamaClQM27
diaphragmtype carburetorisusedon
allmodels.RefertoCARBURETOR
SERVICEsectionforoverhaulproce-
duresandexplodedviewsofZamacar-
buretors.
Initiala4justmentforboththelow-
speedandhigh-speedmixturescrewsis
oneturnopenfrom a lightlyseatedpo-
sition.Makefinal adjustmentwithen-
ginewarmandrunning.Makecertain
thattheaircleanerisclean.
Adjustidlespeedscrewsoengine
idlesjustbelowclutchengagement
speed.Adjustlow-speedmixturescrew
toobtainhighestpossibleenginespeed,
thenturnscrewout(counterclockwise)
1/8to1/4turn.Engineshouldacceler-
atecleanlywithouthesitation.Ifen-
ginestumblesorseemssluggishwhen
accelerating,adjustlow-speedmixture
screwuntilengineacceleratescleanly.
Readjustidlespeedscrewifnecessary
toobtainrecommendedidlespeedof
2800-3300rpm.Chainmustnotmove
whenengineisidling.
High-speedmixturescrewshouldbe
adjustedtoobtainoptimumperform-
ancewithsawundercuttingload.Do
notadjusthigh-speedmixturescrew
toolean(turnedtoofarclockwise)as
maximumpermissibleenginespeed
maybeexceededandenginemaybe
damagedfrom lackoflubricationand
overheating.Maximumno-loadspeed
(withbarandchaininstalled)mustnot
exceed11,000rpm.
Toremovecarburetor(4—Fig.
MC130),removetheairfilter cover(1)
andfilter element.Removethetwo
screwssecuringthefilter base(3)and
carburetor.Removethefilter baseand
carburetor,anddisconnectfuellineand
throttlelink.Tightencarburetor
mountingscrewsto30-40in.-lbs.
(3.4-4.5N-m).
IGNITION.Allenginesare
equippedwithanelectronicignition
system.Theignitioncoilandelectronic
circuitryarecontainedina one-piece
ignitionmodule(10—Fig.MC130),
whichisservicedasa unitassembly.
Airgapbetweenthefiywheel mag-
netsandthelaminatedlegsofthemod-
uleshouldbe0.010-0.015in.(0.25-0.38
mm). Loosenignitionmodulemounting
screwsandmovemoduletoobtainde-
siredairgap.Ifairgapisexcessive,en-
ginemaybiehardtostartormaynot
start.
LUBRICATION.Theengineislu-
bricatedbyoilmixedwiththegasoline
fuel.Recommendedfiiehoil ratiois40:1
whenusingMcCulloch2-cycleoil.If
McCullochoilisnotused,a goodgrade
oildesignedforuseinair-cooled,
two-strokeenginesshouldbemixedat
a20:1ratio.Donotuseoildesignedfor
automotiveuse.Usea separatecon-
tainertomixthefuelandoil.
Allmodelsareequippedwithan
automaticchainoilingsystem.Recom-
mendedoilisMcCullochChain,Bar
andSprocketoil.Oildesignedforauto-
motiveusemayalsobeused.Selectoil
viscosityaccordingtoambienttem-
perature.
REPAIRS
CRANKCASEPRESSURETEST.
Animproperlysealedcrankcasecan
causetheenginetobehardtostart,run
rough,havelowpowerandoverheat.
RefertoENGINESERVICEsectionof
thismanualforcrankcasepressuretest
procedure.Ifcrankcaseleakageisindi-
cated,pressurizethecrankcaseanduse
asolutionofsoapandwatertocheck
gasket,seals,pulselineandcastings
forleakage.
PISTON,RINGSAND
CYLINDER.Toremovethepiston,it
isnecessarytoremovethepowerhead
(12—Fig.MC131)andseparatethecyl-
inderfrom thecrankcaseasfollows:
Unboltandremovechainbrakehous-
ing(13—Fig.MC131),barandchain.
Removetheairfilter cover(10),fan
housing(24),fiiel tank(7)andoiltank
(20). Removetheignitionmodule,air
filter assembly,carburetorandmuffler.
Removesparkplugandinstalla suit-
ablepistonstoptoolorinserttheendof
aropeinsparkplugholetopreventthe
crankshaftfrom rotating.Notethatfly-
Illustntionscouit^yMcCuUoch Corp.
391

McCULLOCHCHAINSAW
Fig. MC130—Expioded view of intake and exiiaust components.
1. Shield
2. Airfilterelement
3. Filterhousing
4. Carburetor
5. Gasket
6.Insulator
7. Seal
8.Spacer
9.Gasket
10. Ignitionmodule
11. Mufflerbody
12. Spacers
13. Reinforcingplate
14. Baffle
15. Sparkarrestorscreen
16. Baffle
17. Mufflercover
wheelretainingnuthasright-hand
threads(turncounterclockwisetore-
move)andclutchretainingnuthas
left-handthreads(turnclockwisetore-
move). Removetheflywheel nutand
tapflywheelcounterbalancewitha
plasticmallettounseattheflywheel
(18—Fig.MC132)fromcrankshaftta-
per.Removetheairshroud(19)andoil
pump(15).Removeclutchretaining
nut(33)andwithdrawtheclutchas-
sembly.
Removescrewsattachingthecrank-
case(27)tothecylinder(1),andsepa-
ratethecrankcasefromthecylinder.
Careshouldbetakennottodamagethe
matingsurfacesofthecrankcaseand
cylinder.Removethecrankshaft(7),
connectingrod(8)andpiston(3)asan
assemblyfromthecylinder.Removere-
tainingrings(5)andpushpistonpin(4)
fromthepiston.Becarefulnottoapply
sidethrusttotheconnectingrodwhen
removingthepistonpin.
Cylinderboreischromeplatedand
nooversizepistonorpistonringis
available.Ifchromeplatingisworn
awayorifcylinderboreisscuffedor
scored,cylindershouldberenewed.
Applya thincoatofsealanttomating
surfaceofcrankcaseandcylinderwhen
assembling.Tightenthecrankcase
screwsto60-70in.-lbs.(6.8-7.9N-m).
CONNECTINGROD.Referto
PISTONsectiontoremoveconnecting
rod(8—Fig.MC132)fromengine.Re-
moverodcaptoseparateconnecting
rodfrom crankshaft.Rodcapneedle
bearingswillbeloosewhenrodcapis
removed.
Inspectconnectingrodforwornor
damagedbearingsurfaces.Connecting
rodshouldnotbebentortwisted.In-
spectcrankshaftcrankpinforwearor
scoring.
Toreassemble,usegreasetohold
bearingrollersinplaceinconnecting
rodandcap.Installconnectingrodon
crankshaftmakingsurethatmatch
marksonrodandcaparealigned.Con-
nectingrodandcaparefracturedand
serrationmustmatecorrectly.Tighten
connectingrodcapscrewsto35-40
in.-lbs. (4.0-4.5N-m).
CRANKSHAFTANDCRANK-
CASE. Crankshaft(7—Fig.MC132)is
supportedintwocagedneedleroller
bearings(10).RefertoPISTONsection
toremovecrankshaftfromengine.Re-
movetheconnectingrodcapandsepa-
ratetheconnectingrodandpistonfrom
crankshaft.
Inspectcrankshaftandbearingsfor
wearordamage.Notethatcrankcase
andcylinderhavematedsurfacesand
mustberenewedasanassembly.Apply
athincoatofsealertomatingsurfaces
ofcrankcaseandcylinderduringas-
sembly.Tightencrankcasescrewsto
60-70in.-lbs.(6.8-7.9N-m).Makecer-
tainthatthecrankshaftrotatesfreely.
Ifnot,disassembleandlocateproblem.
Tightenflywheel retainingnutto180
in.-lbs. (20.3N«m).Donotuseimpact
toolstotightenflywheel nutanddonot
over-torque,otherwiseflywheel hub
canbecrackedanddistorted.
CLUTCH.Toremovetheclutch,de-
tachchainbrakehousing(13—Fig.
MC131),barandchain.Removethe
sparkplugandinstalla suitablepiston
stoptoolorinserttheendofa ropein
sparkplugholetopreventthecrank-
shaftfromrotating.Clutchretaining
nut(33—Fig.MC132)hasleft-hand
threads(turnclockwisetoremove).Re-
moveretainingnut,dustcover(32)
clutchassembly(31),clutchdrum(30)
andneedlebearing(29).
Inspectallpartsforsignsofover-
heatingandexcessivewear.Ifneces-
sarytorenewclutchshoes,renewas
completeset.Checksprocketforworn
railsand pins. Inspectthesprocketnee-
dlebearingforwear.
Tightenclutchretainingnutto180
in.-lbs. (20.3N-m).Nuthasleft-hand
threads.Theuseofanimpactwrenchto
loosenortightenclutchnutisnotrec-
ommended.
AUTOMATICCHAINOILER.The
automaticchainoilpumpisshownin
Fig.MC132.Removethefanhousing,
fljrwheel andairshroudforaccessto
theoilpump.Aplungergearrepairkit
isavailableforthepump.Oilpumpout-
putisnotadjustable.
CHAINBRAKE.Allmodelsare
equippedwitha chainbrakethatstops
thechainmotionwhentheoperator's
handcontactsthechainhandguard
(1—Fig.MC133). TD checkforproper
392IllustrationscourtesyMcCuliochCorp.

SERVICEMANUALMcCULLOCH
1013
23
Fig. MC131—Exploded view of saw components
typical of alt modeta.
1. Starterhousing
2. Rewindspring
3. Ropehandle
4. Ropepulley
5. Fuelprimerbulb
6.Fronthandle
7. Fueltank
8.Heatshield
9.Fuelhose & screen
10. Airfilter cover
11. Foamfilter
12. Powerhead
13. Chainbrakeassy.
14. Enginehousing
15. Throttlelatch
16. Throttlerod
17. Returnspring
18. Throttletrigger
19. Chokerod
20. Oil Unk
21. Oilpickuphose & screen
22. Stopswitchcontacts
23. Stopswitchbutton
24. Fanhotising
24
chainbrakeoperation,placesawonflat
surfaceandrunatwide-openthrottle.
Activatechainhandguardandchain
shouldstopmovingimmediately.Pull
handguardrearwardtodisengage
brake.Noadjustmentofchainbrakeis
required.Ifbrakefailstooperateprop-
erly,disassembleandinspectforprob-
lem.
Tbdisassemblechainbrake,unbolt
andremovebrakehousing(8—Fig.
MC133)from saw.Engagethebraketo
relievespringtension.Removebrake
actuatinglever(5)andcarefullydisen-
gagespring (6). Removebrakeband(9)
from housing.
Inspectallcomponentsforevidence
ofwearordamageandrenewasneces-
sary.Brakebandshouldberenewedif
anypointisworntoa thicknessof0.020
inch(0.5mm)orless.
Whenreassembling,lubricatepivot
pointsandlatchengagingsurfacewith
lightcoatofmultipurposegrease.
REWINDSTARTER,Tbdisassem-
blerewindstarter,removestarter
housing(2—Fig.MC134)fromfan
housing.Removeropehandle(1)and
allowropeandpulleytoslowlyrewind.
Removepulleyretainingscrew(5)and
withdrawropepulley(4).Careshould
betakenwhenremovingrewindspring
(3)nottoallowspringtounwinduncon-
trolled.
Inspectstarterpawls(16—Fig.
MC132)andsprings(17)forwearor
damageandrenewasnecessary.
Rewindspringiscontainedina case
(3—Fig.MC134).Ifspringbecomesdis-
engagedfrom thecase,itshouldbe
woundintothecaseina clockwisedi-
rectionfrom outerend.Starterrope
lengthis50inches(127cm).Windrope
onpulleyinclockwisedirectionviewed
from flywheel side.
TD pre-tensionrewindspring,com-
pletestarterassemblyandpassrope
throughhousingoutlet.Installrope
handle,thenpulla loopofropeback
throughtheoutletandengageropein
notchofropepulley.Rotatepulleyone
tumclockwisewithropeinnotch.Re-
leaseropefrom notchinpulley.Rope
shouldbeheldsnuglyagainstthe
starterhousing.
Pullropehandleandcheckrewind
operation.Withstarterropefullyex-
tended,itshouldbepossibletoturn
pulleyatleastanadditional1/2tum
clockwise.Besureexcessivetensionis
notplacedonrewindspring,otherwise
springmaybreakwhenropeispulled
toitsfiilllength.Repeatspringpre-
tensionprocedureuntildesiredrewind
actionisobtained.
DlustrationscountyMcCuUoch Corp.
393

McCULLOCHCHAINSAW
33
Fig. MC132'-Expioded viewofpowerhead typicai
of ail models.
1. Cylinder
2. Pistonring
3. Piston
4. Pistonpin
5. Snapring
6.Needlebearing
^ 7. Crankshaft
^- 8. Connectingrod
^.-f 9- Seal
^^—tf'^Tjn1^-Mainbearing
^^''^ 11. Needlerollers
12. Wormgear
13. Spring
14, Seal
15. Oilpumphousing
16. Starterpawl
17. Spring
18. Flywheel
19. Airshroud
20. "0"ring
21. Washer
22. Spring
23. Oilpumpplunger
24. Plug
26. Oilhose
26. Adjustingscrew
27. Crankcase
28. Washer
29. Needlebearing
30. Clutchdrum
31. Clutchhub & shoes
32. Dustcover
33. Nut
Fig. fACi33—Expioded view of chainbraife assembly.
1.
2.
3.
Handguard
Brakestop
Brakelatch
4.
5.
6.
Roller
Actuatinglever
Brakespring
7.
8.
9.
Barpadspacer
Brakehousing
Brakehand
10.
11
12.
Foamseal
Shield
Shoulderbolt
Fig. fiAC134^Expioded view of rewind starter.
1. Ropehandle 4. Ropepulley
2. Starterhousing 5. Screw
3. Rewindspring & case 6. Fanhousing
•
394IllustrationscourtesyMcCullochCorp.