Scag Power Equipment STTII-52V-26CH-EFI User manual

PART NO. 03407
PRINTED 1/2016
PRINTED IN USA
© 2016
Scag Power Equipment
Division of Metalcraft of Mayville, Inc.
Congratulations on owning a Scag mower! This manual contains the operating
instructions and safety information for your Scag mower. Reading this manual
can provide you with assistance in maintenance and adjustment procedures to
keep your mower performing to maximum efciency. The specic models that
this book covers are listed on the inside cover. Before operating your machine,
please read all the information enclosed.
OPERATOR’S
MANUAL
Models: STTII-52V-26CH-EFI
STTII-61V-25KA
STTII-61V-26CH-EFI
STTII-61V-26DFI
STTII-61V-31DFI
STTII-61V-35BV
STTII-72V-26CH-EFI
STTII-72V-26DFI
STTII-72V-31DFI
STTII-72V-35BV

WARNING
FAILURE TO FOLLOW SAFE OPERATING PRACTICES MAY RESULT IN
SERIOUS INJURY OR DEATH.
• Readthismanualcompletelyaswellasothermanualsthatcamewithyourmower.
• DONOToperateonsteepslopes.Tocheckaslope,attempttobackupit(withthe
cutterdeckdown).Ifthemachinecanbackuptheslopewithoutthewheelsslipping,
reducespeedanduseextremecaution.
• Undernocircumstancesshouldthemachinebeoperatedonslopesgreaterthan15
degrees.ALWAYSFOLLOWOSHAAPPROVEDOPERATION.
• Staytwocutwidthsawayfromslopes,dropoffs,ditchesandretainingwalls.
• DONOTmowonwetgrass.Wetgrassreducestractionandsteeringcontrol.
• Keepallshieldsinplace,especiallythegrassdischargechute.
• Beforeperforminganymaintenanceorservice,stopthemachineandremovethe
sparkplugwireandignitionkey.
• Ifamechanismbecomesclogged,stoptheenginebeforecleaning.
• Keephands,feetandclothingawayfrompower-drivenparts.
• Keepothersoffthemower (only one person at a time)
REMEMBER - YOUR MOWER IS ONLY AS SAFE AS THE OPERATOR!
HAZARD CONTROL AND ACCIDENT PREVENTION ARE DEPENDENT UPON THE AWARENESS,
CONCERN, PRUDENCE, AND PROPER TRAINING OF THE PERSONNEL INVOLVED IN THE
OPERATION, TRANSPORT, MAINTENANCE, AND STORAGE OF THE EQUIPMENT.
This manual covers the operating instructions and illustrated parts list for:
STTII-52V-26CH-EFI with a serial number of L9900001 to L9999999
STTII-61V-25KA with a serial number of M0100001 to M0199999
STTII-61V-26CH-EFI with a serial number of M0300001 to M0399999
STTII-61V-26DFI with a serial number of M0400001 to M0499999
STTII-61V-31DFI with a serial number of M2600001 to M2699999
STTII-61V-35BV with a serial number of M0500001 to M0599999
STTII-72V-26CH-EFI with a serial number of M0700001 to M0799999
STTII-72V-26DFI with a serial number of M0800001 to M0899999
STTII-72V-31DFI with a serial number of M2700001 to M2799999
STTII-72V-35BV with a serial number of M0900001 to M0999999
Always use the entire serial number listed on the serial number tag when referring to this product.

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Table of Contents
Table of Contents
SECTION 1 - GENERAL INFORMATION...................................................................................1
1.1 INTRODUCTION...........................................................................................................................................1
1.2 DIRECTION REFERENCE ...........................................................................................................................1
1.3 SERVICING THE ENGINE AND DRIVE TRAIN COMPONENTS.................................................................1
1.4 SYMBOLS ....................................................................................................................................................2
SECTION 2 - SAFETY INFORMATION ......................................................................................3
2.1 INTRODUCTION...........................................................................................................................................3
2.2 SIGNAL WORDS ..........................................................................................................................................3
2.3 BEFORE OPERATION CONSIDERATIONS................................................................................................3
2.4 OPERATION CONSIDERATIONS................................................................................................................4
2.5 ROLL-OVER PROTECTION SYSTEM.........................................................................................................6
2.6 MAINTENANCE CONSIDERATIONS & STORAGE ....................................................................................8
2.7 USING A SPARK ARRESTOR.....................................................................................................................8
2.8 SPARK IGNITION SYSTEM .........................................................................................................................8
2.9 SAFETY AND INSTRUCTIONAL DECALS.................................................................................................9
SECTION 3 - SPECIFICATIONS ..............................................................................................10
3.1 ENGINE ......................................................................................................................................................10
3.2 ELECTRICAL .............................................................................................................................................10
3.3 POWER HEAD ...........................................................................................................................................11
3.4 CUTTER DECK ..........................................................................................................................................11
3.5 HYDRAULIC SYSTEM ...............................................................................................................................12
3.6 WEIGHTS AND DIMENSIONS ...................................................................................................................12
3.7 PRODUCTIVITY .........................................................................................................................................12
SECTION 4 - OPERATING INSTRUCTIONS ...........................................................................13
4.1 TIGER EYE INSTRUMENT IDENTIFICATION ...........................................................................................13
4.2 CONTROLS IDENTIFICATION ..................................................................................................................15
4.3 SAFETY INTERLOCK SYSTEM ................................................................................................................16
4.4 INITIAL RUN-IN PROCEDURES................................................................................................................16
4.5 STARTING THE ENGINE ...........................................................................................................................16
4.6 GROUND TRAVEL AND STEERING .........................................................................................................17
4.7 ENGAGING THE DECK DRIVE (CUTTER BLADES)................................................................................18
4.8 HILLSIDE OPERATION..............................................................................................................................18
4.9 PARKING THE MOWER.............................................................................................................................18
4.10 AFTER OPERATION ................................................................................................................................19
4.11 REMOVING CLOGGED MATERIAL ........................................................................................................19
4.12 MOVING MOWER WITH ENGINE STOPPED..........................................................................................19
4.13 RECOMMENDATIONS FOR MOWING ....................................................................................................19
4.14 ADJUSTING CUTTING HEIGHT..............................................................................................................20
4.15 ADJUSTING THE STEERING LEVERS...................................................................................................21
4.16 ADJUSTING THE HEIGHT ADJUST PEDAL ..........................................................................................21
4.17 TOWING (OPTIONAL HITCH ACCESSORY)...........................................................................................21

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Table of Contents
SECTION 5 - TROUBLESHOOTING CUTTING CONDITIONS ...............................................22
SECTION 6 - ADJUSTMENTS .................................................................................................25
6.1 TRAVEL ADJUSTMENTS ..........................................................................................................................26
6.2 THROTTLE CONTROL AND CHOKE ADJUSTMENTS ............................................................................27
6.3 BELT ADJUSTMENT .................................................................................................................................27
6.4 BELT ALIGNMENT.....................................................................................................................................28
6.5 CUTTER DECK ADJUSTMENTS ..............................................................................................................28
6.6 CUSTOM-CUT BAFFLE ADJUSTMENT ...................................................................................................30
6.7 ELECTRIC CLUTCH ADJUSTMENT.........................................................................................................31
SECTION 7 - MAINTENANCE..................................................................................................32
7.1 MAINTENANCE CHART - RECOMMENDED SERVICE INTERVALS ......................................................32
7.2 LUBRICATION............................................................................................................................................33
7.3 HYDRAULIC SYSTEM ...............................................................................................................................35
7.4 ENGINE OIL ...............................................................................................................................................36
7.5 ENGINE FUEL SYSTEM ............................................................................................................................36
7.6 ENGINE AIR CLEANER.............................................................................................................................37
7.7 BATTERY....................................................................................................................................................38
7.8 DRIVE BELTS.............................................................................................................................................39
7.9 CUTTER BLADES......................................................................................................................................39
7.10 TIRES........................................................................................................................................................41
7.11 CUTTER DECK GEARBOX .....................................................................................................................41
7.12 COOLING SYSTEM .................................................................................................................................41
7.13 BODY, DECK, AND UPHOLSTERY .........................................................................................................42
SECTION 8 - ILLUSTRATED PARTS LIST ..............................................................................43
STTII 52V CUTTER DECK ...............................................................................................................................44
STTII 61V & 72V CUTTER DECKS..................................................................................................................46
STTII CUTTER DECK CONTROLS .................................................................................................................48
STTII SHEET METAL COMPONENTS ............................................................................................................50
STTII ROLL-OVER PROTECTION SYSTEM ...................................................................................................52
STTII SUSPENSION SEAT ..............................................................................................................................54
NOTES..............................................................................................................................................................55
STTII DECK DRIVE COMPONENTS ...............................................................................................................56

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Table of Contents
STTII ENGINE AND ATTACHING PARTS - AIR COOLED..............................................................................58
STTII ENGINE & ATTACHING PARTS - LIQUID COOLED.............................................................................60
STTII BRAKE COMPONENTS.........................................................................................................................62
STTII STEERING COMPONENTS ...................................................................................................................64
STTII HYDRAULIC SYSTEM ...........................................................................................................................66
STTII FUEL SYSTEM .......................................................................................................................................68
BDP-16A HYDRAULIC PUMP ASSEMBLY WITH COOLING FAN ................................................................70
STTII ELECTRICAL SYSTEM..........................................................................................................................72
REPLACEMENT DECALS AND INFORMATION PLATES .............................................................................74
ELECTRICAL SCHEMATIC - KAWASAKI 25KA ............................................................................................76
ELECTRICAL SCHEMATIC - KAWASAKI 26DFI............................................................................................77
ELECTRICAL SCHEMATIC - KOHLER 26EFI ................................................................................................78
ELECTRICAL SCHEMATIC - KAWASAKI 31DFI............................................................................................79
ELECTRICAL SCHEMATIC - BRIGGS & STRATTON 35BV ..........................................................................80
NOTES..............................................................................................................................................................81
LIMITED WARRANTY - COMMERCIAL EQUIPMENT................................................... INSIDE BACK COVER

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Table of Contents

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Section 1
1.1 INTRODUCTION
Yourmowerwasbuilttothehigheststandardsinthe
industry.However,theprolongedlifeandmaximum
efficiencyofyourmowerdependsonyoufollowingthe
operating,maintenanceandadjustmentinstructionsin
thismanual.
Ifadditionalinformationorserviceisneeded,contactyour
ScagPowerEquipmentDealer.
Weencourageyoutocontactyourdealerforrepairs.
AllScagdealersareinformedofthelatestmethodsto
servicethisequipmentandprovidepromptandefficient
serviceinthefieldorattheirserviceshop.Theycarrya
fulllineofScagserviceparts.
- IMPORTANT -
The replacement of any part on this product
by other than the manufacturer's authorized
replacement part may adversely affect the
performance, durability or safety of this
product.
Use of other than original Scag replacement
parts will void the warranty.
Whenorderingparts,alwaysgivethemodelandserial
numberofyourmower.Theserialnumberplateislocated
betweentheseatandthecontrolswhereshowninFigure
1-1.
SERIAL NUMBER
LOCATION
Figure 1-1. Mower Serial Number Plate Location
GENERAL INFORMATION
USE ONLY SCAG APPROVED ATTACHMENTS AND
ACCESSORIES.
Attachmentsandaccessoriesmanufacturedbycompanies
otherthanScagPowerEquipmentarenotapprovedfor
useonthismachine.SeeSection8-1.
WARNING
For pictorial clarity, some illustrations and figures
in this manual may show shields, guards or plates
open or removed. Under no circumstances should
your mower be operated without these devices
in place.
Allinformationisbaseduponproductinformationavailable
atthetimeofapprovalforprinting.ScagPowerEquipment
reservestherighttomakechangesatanytimewithout
noticeandwithoutincurringanyobligation.
1.2 DIRECTION REFERENCE
The“Right”and“Left”,“Front”and“Rear”ofthemachine
arereferencedfromtheoperator’srightandleftwhen
seatedinthenormaloperatingpositionandfacingthe
forwardtraveldirection.
1.3 SERVICING THE ENGINE AND DRIVE
TRAIN COMPONENTS
Thedetailservicingandrepairoftheengine,hydraulic
pumpsandgearboxesarenotcoveredinthismanual;
onlyroutinemaintenanceandgeneralserviceinstructions
areprovided.Forserviceofthesecomponentsduringthe
limitedwarrantyperiod,itisimportanttocontactyour
Scagdealerorfindalocalauthorizedservicingagent
ofthecomponentmanufacturer.Anyunauthorizedwork
doneonthesecomponentsduringthewarrantyperiod
mayvoidyourwarranty.

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Section 1
1.4 SYMBOLS
SYMBOL DESCRIPTION SYMBOL DESCRIPTION

Choke

Transmission

ParkingBrake

48071S
SpinningBlade

On/Start

SpringTensiononIdler

Off/Stop

Oil

FallingHazard

ThrownObjectHazard

Fast

Slow

ContinuouslyVariable-Linear

CuttingElement-BasicSymbol

481039S
PinchPoint

CuttingElement-Engage

Hourmeter/ElapsedOperatingHours

CuttingElement-Disengage

KeepBystandersAway

ReadOperator'sManual

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Section 2
2.1 INTRODUCTION
Yourmowerisonlyassafeastheoperator.Carelessness
or operator error may result in serious bodily injury
or death. Hazard control and accident prevention are
dependentupontheawareness,concern,prudence,and
propertrainingofthepersonnelinvolvedintheoperation,
transport,maintenanceandstorageoftheequipment.Make
sure every operator is properly trained and thoroughly
familiar with all of the controls before operating the
mower.Theowner/usercanpreventandisresponsiblefor
accidentsorinjuriesoccurringtothemselves,otherpeople
orproperty.
READ THIS OPERATOR’S MANUAL BEFORE
ATTEMPTING TO START YOUR MOWER.
Areplacementmanualisavailablefromyourauthorized
Scag Service Dealer or by contacting Scag Power
Equipment,ServiceDepartmentatP.O.Box152,Mayville,
WI53050orcontactusviatheInternetatwww.scag.com.
Themanualforthismachinecanbedownloadedbyusing
themodelandserialnumberorusethecontactformto
makeyourrequest.Pleaseindicatethecompletemodel
andserialnumberofyourScagproductwhenrequesting
replacementmanuals.
2.2 SIGNAL WORDS
This symbol means “Attention! Become Alert! Your
Safety is Involved!"Thesymbolisusedwiththefollowing
signalwordstoattractyourattentiontosafetymessages
foundonthedecalsonthemachineandthroughoutthis
manual.The message that follows the symbol contains
important information about safety.To avoid injury and
possibledeath,carefullyreadthemessage!Besuretofully
understandthecausesofpossibleinjuryordeath.
SIGNAL WORD:
Itisadistinctivewordfoundonthesafetydecalsonthe
machineandthroughoutthismanualthatalertstheviewer
totheexistenceandrelativedegreeofthehazard.
DANGER
The signal word“DANGER” denotes that an extremely
hazardous situation exists on or near the machine that
couldresultinhighprobabilityofdeathorirreparableinjury
ifproperprecautionsarenottaken.
WARNING
Thesignalword“WARNING”denotesthatahazardexists
onornearthemachinethatcanresultininjuryordeathif
properprecautionsarenottaken.
CAUTION
Thesignalword“CAUTION”isareminderofsafetypractices
onornearthemachinethatcouldresultinpersonalinjury
ifproperprecautionsarenottaken.
Yoursafetyandthesafetyofothersdependssignificantly
upon your knowledge and understanding of all correct
operatingpracticesandproceduresofthismachine.
2.3 BEFORE OPERATION
CONSIDERATIONS
WARNING
Check all hydraulic connections for tightness.
Inspect all hydraulic hoses and / or lines to insure
they are in good condition before operating.
1. NEVERallowchildrentooperatethisridingmower.
Donotallowadultstooperatethismachinewithout
properinstructions.
2. Donotmowwhenchildrenand/orothersare
present.Keepchildrenoutofthemowingareaand
inthewatchfulcareofaresponsibleadultotherthan
theoperator.Bealertandturnmachineoffifachild
entersthearea.
SAFETY INFORMATION

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Section 2
3. DONOTallowchildrentorideorplayonthe
machine,itisnotatoy.
4. Cleartheareatobemowedofobjectsthatcouldbe
pickedupandthrownbythecutterblades.
5. DONOTcarrypassengers.
6. DONOToperatethemachineundertheinfluenceof
alcoholordrugs.
7. Iftheoperator(s)ormechanic(s)cannotread
English, itistheowner'sresponsibilitytoexplain this
materialtothem.
8. DONOTwearloosefittingclothing.Looseclothing,
jewelryorlonghaircouldgettangledinmoving
parts.Donotoperatethemachinewearingshorts;
alwayswearadequateprotectiveclothingincluding
longpants.Wearingsafetyglasses,safetyshoesand
ahelmetisadvisableandisrequiredbysomelocal
ordinancesandinsuranceregulations.
WARNING
Always wear hearing protection. Operating this
machine over prolonged periods of time can
cause loss of hearing.
9. Keepthemachineandattachmentsingood
operatingcondition.Keepallshieldsandsafety
devicesinplace.Ifashield,safetydeviceordecal
isdefectiveordamaged,repairorreplaceitbefore
operatingthemachine.
WARNING
This machine is equipped with an interlock system
intended to protect the operator and others from
injury. This is accomplished by preventing the
engine from starting unless the deck drive is
disengaged, the parking brake is on, the steering
control levers are in the neutral position and the
operator is in the seat. The system shuts off the
engine if the operator leaves the seat with the deck
drive engaged and/or the steering control levers
are not in the neutral position and the parking
brake is not engaged. Never operate equipment
with the interlock system disconnected or
malfunctioning.
10. Besuretheinterlockswitchesarefunctioning
correctly.
11. Fuelisflammable;handleitwithcare.Fillthefuel
tankoutdoors.Neverfillitindoors.Useafunnelor
spouttopreventspillage.Cleanupanyspillage
beforestartingtheengine.
12. DONOTaddfueltoarunningorhotengine.Allow
theenginetocoolforseveralminutesbeforeadding
fuel.Neverfuelindoorsorinsideenclosedtrailers.
13. Keepflammableobjects(cigarettes,matches,etc.),
openflamesandsparksawayfromthefueltankand
fuelcontainer.Useonlyapprovedcontainers.
14. SeeSection7.5ENGINEFUELSYSTEMforfueling
procedure.
15. Equipmentmustcomplywiththelatestrequirements
perSAEJ137and/orANSI/ASAES279whendriven
onpublicroads.
- NOTE -
If the mower is driven on public roads, it must
comply with state and local ordinances as well as
SAE J137 and/or ANSI / ASAE S279 requirements.
Contact your local authorities for regulations and
equipment requirements.
16. Donotoperatewithoutthesidedischargechute
installedandinthedownpositionorwithanoptional
grasscatcherormulchplatecompletelyinstalled.
17. Checktheblademountingboltsatfrequentintervals
forpropertightness.
18. Makesureallhydraulicfluidconnectionsaretight
andallhydraulichosesandlinesareingood
conditionbeforestartingthemachine.
2.4 OPERATION CONSIDERATIONS
1. Knowthefunctionofallcontrolsandhowtostop
quickly.
WARNING
DO NOT operate on steep slopes.To check a slope,
attempt to back up it (with the cutter deck down).
If the machine can back up the slope without the
wheels slipping, reduce speed and use extreme
caution. Under no circumstances should the
machine be operated on slopes greater than 15
degrees. See Figure 2-4, Page 7 to determine
approximate slope of area to be mowed. ALWAYS
FOLLOW OSHA APPROVED OPERATION.