MODEL STHM
THIS MANUAL CONTAINS THE OPERATING
INSTRUCTIONS AND SAFETY INFORMA-
TION FOR YOUR SCAG MOWER. READING
THIS MANUAL CAN PROVIDE YOU WITH
ASSISTANCE IN MAINTENANCE AND AD-
JUSTMENT PROCEDURES TO KEEP YOUR
MOWER PERFORMING TO MAXIMUM EFFI-
CIENCY. THE SPECIFIC MODELS THATTHIS
BOOK COVERS ARE CONTAINED ON THE
INSIDE COVER. BEFORE OPERATINGYOUR
MACHINE, PLEASE READ ALL THE INFOR-
MATION ENCLOSED.
© 2005
SCAG POWER EQUIPMENT
DIVISION OF METALCRAFT OF MAYVILLE, INC.
PART NO. 03168
PRINTED 10/05
PRINTED IN USA
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TABLE OF CONTENTS
MODEL STHM
SUBJECT
PAGE
Introduction .................................................................................................. 1
General Safety Instructions.......................................................................... 1
Signal Words ............................................................................................... 1
Symbols....................................................................................................... 2-3
Before Operating ......................................................................................... 4
While Operating........................................................................................... 5-6
Maintenance and Storage ........................................................................... 6-7
Initial Run-In Procedures ............................................................................. 7
Mower Operation ......................................................................................... 8-9
Parking Brake Adjustments ......................................................................... 9
Neutral Adjustment ...................................................................................... 9-10
Belt Tension ................................................................................................. 10-11
Belt Alignment ............................................................................................. 11
Cutter Deck Adjustments ............................................................................. 11-12
Cutter Blades............................................................................................... 13
Custom-Cut Baffle Adjustment..................................................................... 13-14
Lubrication and Maintenance ...................................................................... 15
Troubleshooting Cutting Conditions ............................................................ 16-18
Technical Specifications .............................................................................. 19-20
Notes .......................................................................................................... 21
WE SUPPORT OPE
TECHNICIAN
CERTIFICATION
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TABLE OF CONTENTS
(CONTINUED)
SUBJECT
Illustrated Parts List
PAGE
SM 61V, 72A Cutter Deck...................................................................... ... 22-23
Engine Deck ..................................................................................... 24-25
Upper Hydraulics .............................................................................. 26-27
Lower Hydraulics........................................................................................ 28-29
Control Linkage.......................................................................................... 30-31
Instrument Panel ............................................................................... 32-33
Rider Frame Assembly ..................................................................... 34-35
Brake Linkage................................................................................... 36-37
Eletrical System ................................................................................ 38
Winch Lift System ............................................................................. 39
Replacement Decals ........................................................................ 40
Warranty Statement........................................................ following section 8
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INTRODUCTION
SIGNAL WORDS
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 instruc-
tions in this manual.
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 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.
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.
A replacement Operator's Manual is available from
your Scag Servicing Dealer or by contacting Scag
Power Equipment, Service Department at P.O. Box
152,Mayville,WI53050orcontactusviatheInternet
atwww.scag.com. Themanualforthismachinecanbe
downloadedbyusingthemodelandserialnumberor
Signal Word:
It is a distinctive word on safety decals and through-
out this manual that alerts the viewer to the exist-
ence and relative degree of the hazard.
usethecontactformtomakeyourrequest.
USE OF OTHER THAN ORIGINAL SCAG
REPLACEMENT PARTS WILL VOID THE
WARRANTY.
The signal word “DANGER” denotes that an ex-
tremely 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.
The “Right” and “Left”, “Front” and “Rear” of the
machine are referenced from the operator’s perspec-
tive when in the normal operating position and
facing the forward travel direction.
GENERAL SAFETY INSTRUCTIONS
WARNING:
READ THIS OPERATOR'S MANUAL and all
instructions furnished with attachments.
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.
Perform only those maintenance procedures de-
scribed in this manual. If major repairs are ever
needed or assistance is desired, contact an Author-
ized Scag Dealer. To ensure optimum performance
and safety, always purchase genuine SCAG replace-
ment parts and accessories.
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 signifi-
cantly upon your knowledge and understanding of
allcorrectoperatingpracticesandproceduresofthis
machine.
1
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ISO Symbols
CE Mark
SYMBOL
DESCRIPTION
SYMBOL
DESCRIPTION
Choke
Transmission
Parking Brake
Spinning Blade
48071S
On/Start
Off/Stop
Spring Tension on Idler
Oil
Thown Object Hazard
Falling Hazard
2
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SYMBOL
DESCRIPTION
SYMBOL
DESCRIPTION
Slow
Fast
Cutting Element - Basic Symbol
Continuously Variable - Linear
Cutting Element - Engage
Pinch Point
481039S
Hourmeter/Elapsed Operating Hours
Cutting Element - Disengage
Read Operator's Manual
Thown Object Hazard
Keep Bystanders Away
3
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G. Remove the machine from the truck or trailer and
fuel on the ground. If this is not possible, then
refuel the machine with a portable container,
rather than from a gasoline dispenser nozzle.
BEFORE OPERATING
1. NEVER allow children to operate this riding mower.
Do not allow adults to operate this machine without
proper instructions.
H. Keep the nozzle in contact with the rim of fuel
tank or container opening at all times until fueling
is complete. Do not use a nozzle lock-open
device.
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.
I. If fuel is spilled on clothing, change clothing
immediately.
3. The owner/user can prevent and is responsible for
accidents or injuries occuring to themselves, other
people or property.
J. Replace gas cap and tighten securely.
8. If the operator(s) or mechanic(s) cannot read English
or Spanish, it is the owner's responsibility to explain
this material to them.
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.
9. DO NOT wear loose fitting clothing that 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.
6. DO NOT operate the machine under the influence of
alcohol or drugs.
7. Fill the fuel tank with clean, fresh gasoline, with a
minimum octane rating of 87. To avoid personal
injury or property damage, use extreme care in
handling gasoline. Gasoline is extremely flammable
and the vapors are explosive.
10. Operator hearing protection is recommended,
particularly for continuous operation of the mower.
Wear suitable hearing protection. Prolonged
exposure to loud noise can cause hearing impairment
or loss.
A. Extinguish all cigarettes, cigars, pipes and other
sources of ignition.
11. 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.
B. Use only an approved gasoline container.
C. Never remove the gas cap or add fuel with the
engine running. Allow the engine to cool before
fueling.
12. Be sure the safety switches are functioning correctly.
D. Never fuel the machine indoors or in an enclosed
trailer.
13. 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. Scag approved
attachments and accessories:
E. Never store the machine or fuel container where
there is an open flame , spark or pilot light such as
on a water heater or other appliances.
F. Never fill containers inside a vehicle or on a truck
or trailer bed with a plastic liner. Always place
containers on the ground away from your vehicle
beforefilling.
Mulch Plate (p/n 9288, 9262)
Hurricane Mulch (p/n 9285, 9267)
Cup Holder (p/n 9240)
4
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10. Keephandsandfeetawayfromcuttingunits.
WHILE OPERATING
11. Shuttheengineoffandwaituntilthebladescome
toacompletestopbeforeremovingthegrass
catchercontainer.
1. Starttheenginewhenthecutterbladesaredisen-
gaged,theparkingbrakeisonandtherightfoot
pedalisintheneutralposition. Onlystartthe
enginefromtheoperatorsposition.
12. Neverraisethecutterdeckwhilethebladesare
rotating.
2. Donotruntheengineinaconfinedareawithout
adequateventilation. Exhaustfumesarehazardous
andcouldpossiblybedeadly.
13. Alwaysparkthemowerand/orstarttheengineon
alevelsurface. Applytheparkingbraketo
preventthemowerfrommovingwhenyouarenot
intheoperator’sposition.
3. Usecarewhenloadingorunloadingthemachine
ontoatrailerortruck.
14. Ifthecuttingbladesshouldstrikeasolidobjector
theequipmentshouldstarttovibrateabnormally,
stoptheengine,disconnectthesparkplugwires,
andcheckimmediatelyforthecause. Vibrationis
generallyawarningoftrouble. Checkthemachine
fordamagedordefectiveparts. Repairany
damagebeforestartingtheengineoroperatingthe
cutter deck. Be sure the blades are in good
conditionandthebladeboltsaretight.
4. Lookbehindanddownbeforebackinguptobe
sureofaclearpath.
5. Usingthemachinedemandsattention. To
preventlossofcontrol:
A. Mowonlyindaylightorwhenthereisgood
artificiallight.
B. Watchforholesorotherhiddenhazards.
15. Reducespeedandexerciseextremecautionon
slopesandinsharpturnstopreventtippingorloss
ofcontrol. Beespeciallycautiouswhenchanging
directionsonslopes.
C. Donotdriveclosetoadrop-off, ditch, creek
bank,orotherhazard.
E. Donotoperatewhereconditionsareslippery.
WARNING:
6. Thedischargechutemustalwaysbeinstalledand
inthedownpositiononthesidedischargecutter
deckexceptwhenthemulchingplateorHurricane
MulchKitareproperlyinstalled. Ifthedischarge
areashouldplug,shuttheengineoffandwaitfor
allmovementtostopbeforeremovingtheobstruc-
tion.
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
useextremecaution. ALWAYSFOLLOWOSHA
APPROVEDOPERATION.
16. Usecarewhenapproachingblindcorners,shrubs,
trees,orotherobjectsthatmayobscurevision.
7. NEVERoperatewiththePTOshield,orother
guardsnotsecurelyinplace. Besureallinter-
locksareaattached,adjustedandfuncioning
properly.
17. Donottouchtheengineormufflerwhiletheengine
isrunningorsoonafteritisstopped. Theseareas
couldbehotenoughtocauseaburn.
8. Disengagethebladesandwaitforthemtostop
beforecrossinggraveldrives,walksorroads.
9. Beawareofdischargedirectionanddonotpoint
atanyone.
5
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7. Besurethemachineisinsafeoperatingconditionby
keepingnuts,bolts,andscrewstight. Checkthe
blademountingboltsandnutsfrequentlytobesure
theyaretightened.
18. Beforeleavingtheoperator’spositionorleaving
themowerunattended,movetherightfootpedal
intotheneutralposition,applytheparkingbrake,
andmovethebladeengagementswitchtoOFF.
ShuttheengineOFFandremovethekey.
8. Iftheenginemustberunningtoperformamainte-
nanceadjustment,keephands,feet,clothingand
otherpartsofthebodyawayfromthecutterdeck
bladesandothermovingparts.
19. Donotpassorstandonthegrassdischargeside
ofanymowerwiththeenginerunning. Stopthe
cutterbladeswhenanotherpersonapproaches.
9. Donotoverspeedtheenginebychanginggovernor
settings. Tobesureofsafetyandaccuracy,havean
authorizeddealercheckmaximumenginespeedwith
atachometer.
WARNING:
Battery posts, terminals, and related accessories
contain lead and lead compounds, chemicals
known to the State of California to cause cancer
and reproductive harm. Wash hands after
10. Theenginemustbeshutoffbeforecheckingtheoil
oraddingoiltothecrankcase.
handling.
MAINTENANCE AND STORAGE
11. Allowtheenginetocoolbeforestoringthemowerin
anyenclosuresuchasagarageorstorageshed.
Makesurethefueltankisemptyifthemachineisto
be stored in excess of 30 days. Do not store the
mowernearanyopenflameorwheregasolinefumes
maybeignitedbyaspark.
1. Disconnect the spark plug wire from the spark
plug to prevent accidental starting of the engine
when servicing, adjusting or storing the machine.
2. If the mower must be tipped to perform mainte-
nance or adjustment, remove the battery, drain
the gasoline from the fuel tank and the oil from
the crankcase. Use jack stands to support the
machinewhenrequired.
12. Alwaysstoregasolineinasafety-approved,red
container.
13. Becarefulwhenservicingthebatteryasitcontains
acid,whichiscorrosiveandcouldcauseburnsto
skinandclothing.
3. To reduce potential fire hazard, keep the engine
free of excessive grease, grass, leaves and accu-
mulations of dirt.
14. Batteriesreleaseexplosivegaseswhenbeing
chargedordischarged. Keepbatteriesawayfrom
anysourceofsparksand/orflame. Chargebatter-
iesinanopen,wellventilatedarea.
4. Parkthemachineonlevelground. Neverallow
untrainedpersonneltoservicethemachine.
5. Disconnectbatteryorremovesparkplugwires
beforemakinganyrepairs. Disconnectthenegative
terminalfirstandthepositivelast. Reconnect
positivefirstandnegativelast.
15. Makesureallhydraulicconnectionsaretightandall
hydraulichosesandlinesareingoodcondition
beforestartingthemachine.
6. Usecarewhencheckingblades. Wraptheblades
orwearglovesandusecautionwhenservicingthem.
Onlyreplaceblades. Neverstraightenorweld
them.
6
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WARNING:
Hydraulic fluid is under high pressure. Keep
body and hands away from pinholes or nozzles that
eject hydraulic fluid under high pressure. If you need
service on your hydraulic system, please see your
authorized Scag dealer. If hydraulic fluid is injected
into the skin, it must be surgically removed within a
few hours by a doctor or gangrene may result.
INITIAL RUN-IN PROCEDURES
(FIRST DAY OF USE OR APPROXI-
MATELY 10 HOURS)
1. Check the belts for proper tension at 2, 4 and 8
hours. Adjust as needed. (See Belt Tension,
page9).
2. Check the neutral adjustment. (See Adjust-
ments,page8)
3. Checkthetiresforproperpressure.
CasterWheels
DriveWheels
FlatFree
12 psi
RearSteeringWheel 15 psi
4. Checkforloosehardware. Tightenasneeded.
5. Checkthesafetyswitchesforproperadjustment:
* Theengineshouldcrankandstartifthe
machineisinneutral,thePTOengagement
switch is OFF and the parking brake is ON.
7. Applylubricanttoallthegreasefittings. Lubricant
wasappliedatthefactory. Thisisjustaprecaution-
arychecktomakesurethatallthefittingshavebeen
lubricated.
7
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-NOTE-
MOWER OPERATION
When the PTO is engaged or (possibly) disen-
gaged, a squealing sound from the underside of
the machine is normal. It is caused by the
electric clutch plates meshing as the cutter
blades come up to speed. For best equipment
life, engage the clutch with the engine at 3/4
throttle, not under full load.
1. Readandunderstandthesafetyinstructions
before attempting to operate this machine.
2. Before starting the engine:
* Check the oil level in the engine and the
hydraulicreservoir.
* Fill the fuel tank with clean, fresh, lead-free
gasoline.
* Open the fuel valve on the bottom of the
fueltank.
WARNING:
If you are not familiar with the operation of the
hydrostaticdrive,practiceturningand
maneuveringbeforeengagingthecutterblades.
-NOTE-
Use gasoline with an octane rating no less than
87.
5. Releasetheparkingbrake. Depresstheright foot
pedalatthetoeendtodriveforward(SeeFigure1)
ordepressthepedalattheheelendtodrivein
reverse.(SeeFigure2)
* The right hand foot pedal must be in the
NEUTRAL position.
* The blade clutch switch must be in the OFF
position.
* The parking brake must be ON.
-NOTE-
The left side operator presence pedal must be
depressed for operation.
3. Start the engine:
* Choke as required. If the engine is cold, pull
the choke knob out. When the engine starts,
slowly push the choke in. If the engine stalls,
repeat the above operation. When the engine
is warm, choking may not be necessary.
4. Depress the left hand operator presence pedal.
sgb002
5. Engagethecutterbladesbypullingthebladeclutch
switchintotheONposition. Pushtheswitchtothe
OFFpositiontodisengagethecutterblades.
Depress Toe End of Pedal
Figure 1. Forward Operation
PULL UP TO ENGAGE
PUSH DOWN TO DISENGAGE
390S0138
8
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ADJUSTMENTS
PARKING BRAKE
Minorbrakeadjustmentscanbemadebyloosening
thetopnutonbothbrakecables(seeFigure4).
Backthenutsoffapproximately1/4". Whilepulling
onecabledownward,tightenthebottomnutonthe
cableuntilittouchesthebottomofthebrakecable
mount. Tightenboththetopandbottomnutsto
lockthecableinplace. Repeattheabovestepsfor
the second brake cable. Make sure that both
cablesareadjustedevenlysothatthebrakesdonot
causethemowertopulltotheleftorright.
SGB003
Depress Heel End of Pedal
Figure 2. Reverse Operation
-NOTE-
6. Whendrivingovercurbs,disengagethecutter
bladesandraisethecutterdecktoclearthecurb.
Driveforwardoverthecurb. Afterthecurbis
clear,lowerthecutterdeckbacktonormal
operatingposition. Besuretoleaveslackinthe
cableafterloweringthecutterdeck.
This is a minor brake adjustment. If the
brakes do not function properly after this
adjustment, see your Scag Service Dealer
before operating your mower.
7. To"freewheel"ormovethemachinearound
withouttheenginerunning,rotatethedumpvalve
leverlocatedontheleftrearoftheenginedeckto
thefreewheelposition(SeeFigure3). Thelever
mustbereturnedtothedrivepositiontooperate
themachine.
DUMP VALVE
FREE
WHEEL
DRIVE
Adjust
Nuts
SGB028
Figure 4. Parking Brake Adjustment
NEUTRAL ADJUSTMENT
1. Settheenginedeckuponjackstandssothewheels
are free to rotate.
SGB006
2. Blockthecasterwheelstopreventanaccident
shouldthemachinefalloffthejackstands.
Figure 3. Dump Valve Location
-NOTE-
3. Starttheengineanddetermineifthedrivewheels
rotate.
To prevent damage to the hydraulic system, do
not exceed 1MPH when moving the machine in
the freewheel postion.
9
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