Scag Power Equipment Turf Tiger Diesel Powered STT61V-25KBD User manual

PART NO. 03365
PRINTED 5/2014
PRINTED IN USA
© 2014
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
Turf Tiger
Diesel Powered
Model: STT61V-25KBD
STT72V-25KBD
STT-25KBD

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.
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 mow• er (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:
STT61V-25KBD with a serial number of K1600001 to K1699999
STT72V-25KBD with a serial number of K2300001 to K2399999
STT-25KBD with a serial number of K2800001 to K2899999
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
GENERAL INFORMATIONSECTION 1 - ...................................................................................1
1.1 INTRODUCTION...........................................................................................................................................1
1.2 DIRECTION REFERENCE ...........................................................................................................................1
1.3 SERVICING THE ENGINE AND DRIVE TRAIN COMPONENTS.................................................................1
1.4 SYMBOLS ....................................................................................................................................................2
SAFETY INFORMATIONSECTION 2 - ......................................................................................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.....................................................................................................................9
2.8 SAFETY AND INSTRUCTIONAL DECALS...............................................................................................10
SPECIFICATIONSSECTION 3 - ..............................................................................................11
3.1 ENGINE ......................................................................................................................................................11
3.2 ELECTRICAL .............................................................................................................................................11
3.3 POWER HEAD ...........................................................................................................................................11
3.4 CUTTER DECK ..........................................................................................................................................12
3.5 HYDRAULIC SYSTEM ...............................................................................................................................12
3.6 WEIGHTS AND DIMENSIONS ...................................................................................................................12
3.7 PRODUCTIVITY .........................................................................................................................................12
OPERATING INSTRUCTIONSSECTION 4 - ...........................................................................13
4.1 CONTROLS AND INSTRUMENT IDENTIFICATION .................................................................................13
4.2 SAFETY INTERLOCK SYSTEM ................................................................................................................14
4.3 INITIAL RUN-IN PROCEDURES (FIRST DAY OF USE OR APPROXIMATELY 10 HOURS) ...................15
4.4 STARTING THE ENGINE ...........................................................................................................................15
4.5 GROUND TRAVEL AND STEERING .........................................................................................................15
4.6 ENGAGING THE DECK DRIVE (CUTTER BLADES)................................................................................16
4.7 HILLSIDE OPERATION..............................................................................................................................17
4.8 PARKING THE MOWER .............................................................................................................................17
4.9 AFTER OPERATION ..................................................................................................................................17
4.10 REMOVING CLOGGED MATERIAL ........................................................................................................17
4.11 MOVING MOWER WITH ENGINE STOPPED ..........................................................................................18
4.12 RECOMMENDATIONS FOR MOWING....................................................................................................18
4.13 ADJUSTING CUTTING HEIGHT..............................................................................................................19
4.14 ADJUSTING THE HEIGHT ADJUST PEDAL ..........................................................................................19
4.15 ADJUSTING THE STEERING LEVERS...................................................................................................20
4.16 TOWING (OPTIONAL HITCH ACCESSORY)...........................................................................................20
TROUBLESHOOTING CUTTING CONDITIONSSECTION 5 - ...............................................21

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Table of Contents
ADJUSTMENTSSECTION 6 - .................................................................................................24
6.1 PARKING BRAKE ADJUSTMENT ............................................................................................................24
6.2 TRAVEL ADJUSTMENTS ..........................................................................................................................25
6.3 THROTTLE CONTROL ADJUSTMENTS...................................................................................................26
6.4 BELT ADJUSTMENT .................................................................................................................................26
6.5 BELT ALIGNMENT.....................................................................................................................................27
6.6 CUTTER DECK ADJUSTMENTS ..............................................................................................................27
6.7 ELECTRIC CLUTCH ADJUSTMENT.........................................................................................................30
MAINTENANCESECTION 7 - ..................................................................................................31
7.1 MAINTENANCE CHART - RECOMMENDED SERVICE INTERVALS ......................................................31
7.2 LUBRICATION............................................................................................................................................32
7.3 HYDRAULIC SYSTEM ...............................................................................................................................34
7.4 ENGINE OIL ...............................................................................................................................................35
7.5 ENGINE FUEL SYSTEM ............................................................................................................................35
7.6 ENGINE AIR CLEANER.............................................................................................................................36
7.7 BATTERY....................................................................................................................................................36
7.8 DRIVE BELTS.............................................................................................................................................37
7.9 CUTTER BLADES......................................................................................................................................37
7.10 TIRES........................................................................................................................................................38
7.11 CUTTER DECK GEARBOX .....................................................................................................................39
7.12 COOLING SYSTEM .................................................................................................................................39
7.13 BODY, DECK, AND UPHOLSTERY .........................................................................................................40
ILLUSTRATED PARTS LISTSECTION 8 - ..............................................................................42
8.1 SCAG APPROVED ATTACHMENTS AND ACCESSORIES......................................................................42
61V & 72VS CUTTER DECKS .........................................................................................................................44
CUTTER DECK CONTROLS ...........................................................................................................................46
SHEET METAL COMPONENTS ......................................................................................................................48
STT ROLL-OVER PROTECTION SYSTEM .....................................................................................................50
STT SUSPENSION SEAT ................................................................................................................................52
DECK DRIVE COMPONENTS .........................................................................................................................54
ENGINE & ATTACHING PARTS - KUBOTA DIESEL ......................................................................................56
BRAKE AND STEERING COMPONENTS ......................................................................................................58
FUEL AND HYDRAULIC SYSTEM - KUBOTA DIESEL..................................................................................60
BDP-16A HYDRAULIC PUMP ASSEMBLY WITH COOLING FAN.................................................................62
ELECTRICAL SYSTEM - KUBOTA DIESEL ...................................................................................................64
REPLACEMENT DECALS AND INFORMATION PLATES .............................................................................66
ELECTRICAL SCHEMATIC - KUBOTA DIESEL .............................................................................................68
LIMITED WARRANTY - COMMERCIAL EQUIPMENT.........................................................Inside Back Cover

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Section 1
INTRODUCTION1.1
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.
THE REPLACEMENT OF ANY PART ONTHIS PRODUCT
BY OTHERTHANTHE MANUFACTURER'S AUTHORIZED
REPLACEMENT PART MAY ADVERSELY AFFECT THE
PERFORMANCE, DURABILITY OR SAFETY OF THIS
PRODUCT.
USE OF OTHERTHAN 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
where shown in Figure 1-1.
SERIAL NUMBER
PLATE LOCATION
MODEL
SERIAL
Division of Metalcraft of Mayville, Inc.
Mayville, Wisconsin 53050
Patents: www.scag.com/patents/html
R
Mower Serial Number Plate LocationFigure 1-1.
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.
DIRECTION REFERENCE1.2
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.
SERVICING THE ENGINE AND DRIVE1.3
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
SYMBOLS1.4
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
Thrown Object Hazard
Keep Bystanders Away
Read Operator's Manual

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Section 2
INTRODUCTION2.1
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.
SIGNAL WORDS2.2
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 irrepairable 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.
BEFORE OPERATION2.3
CONSIDERATIONS
WARNING
Check all hydraulic connections for tightness.
Inspect all hydraulic hoses and / or lines to insure
they are in good condition before operating.
NEVER allow children to operate this riding mower.1.
Do not allow adults to operate this machine without
proper instructions.
Do not mow when children and/or others are2.
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

4
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Section 2
DO NOT allow children to ride or play on the3.
machine, it is not a toy.
Clear the area to be mowed of objects that could be4.
picked up and thrown by the cutter blades.
DO NOT carry passengers.5.
DO NOT operate the machine under the influence of6.
alcohol or drugs.
If the operator(s) or mechanic(s) cannot read English7.
or Spanish, it is the owner's responsibility to explain
this material to them.
DO NOT wear loose fitting clothing. Loose clothing,8.
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.
Keep the machine and attachments in good9.
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.
Be sure the interlock switches are functioning10.
correctly.
Fuel is flammable; handle it with care. Fill the fuel11.
tank outdoors. Never fill it indoors. Use a funnel or
spout to prevent spillage. Clean up any spillage
before starting the engine.
DO NOT add fuel to a running or hot engine. Allow12.
the engine to cool for several minutes before adding
fuel. Never fuel indoors or inside enclosed trailers.
Keep flammable objects (cigarettes, matches, etc.),13.
open flames and sparks away from the fuel tank and
fuel container. Use only approved containers.
See Section 7.5 ENGINE FUEL SYSTEM for fueling14.
procedure.
Equipment must comply with the latest requirements15.
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.
Do not operate without the side discharge chute16.
installed and in the down position or with an optional
grass catcher or mulch plate completely installed.
Check the blade mounting bolts at frequent intervals17.
for proper tightness.
Make sure all hydraulic fluid connections are tight18.
and all hydraulic hoses and lines are in good
condition before starting the machine.
OPERATION CONSIDERATIONS2.4
Know the function of all controls and how to stop1.
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 8 to determine
approximate slope of area to be mowed. ALWAYS
FOLLOW OSHA APPROVED OPERATION.

5
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Section 2
Reduce speed and exercise extreme caution on2.
slopes and in sharp turns to prevent tipping or loss
of control. Be especially cautious when changing
directions on slopes.
Stay two cut widths away from slopes, drop offs,3.
ditches and retaining walls.
To prevent tipping or loss of control, start and stop4.
smoothly, avoid unnecessary turns and travel at
reduced speed.
Immediately apply the parking brake if you lose5.
steering control while operating. Inspect the machine
and correct the problem before continuing to operate.
When using any attachment, never direct the6.
discharge of material toward bystanders or allow
anyone near the machine while in operation.
Before attempting to start the engine, with the7.
operator in the seat, disengage power to the cutter
deck, place the steering control levers in the neutral
position and engage the parking brake.
If the mower discharge ever plugs, shut off the8.
engine, remove the ignition key, and wait for all
movement to stop before removing the obstruction.
WARNING
DO NOT use your hand to dislodge the clogged
discharge chute. Use a stick or other device to
remove clogged material after the engine has
stopped running and the blades have stopped
turning.
Be alert for holes, rocks, roots and other hidden9.
hazards in the terrain. Keep away from any drop-
offs. Beware of overhead obstructions (low limbs,
etc.), underground obstacles (sprinklers, pipes, tree
roots, etc.). Cautiously enter a new area. Be alert for
hidden hazards.
Disengage power to cutter deck before backing up.10.
Do not mow in reverse unless absolutely necessary
and then only after observation of the entire area
behind the mower. If you must mow in reverse,
maintain a constant lookout to the rear of the
machine and mow slowly.
DO NOT turn sharply. Use care when backing up.11.
Disengage power to cutter deck before crossing12.
roads, walks or gravel drives.
Mow only in daylight or good artificial light.13.
NEVER raise the deck with the blades engaged.14.
Take all possible precautions when leaving the15.
machine unattended, such as disengaging the
mower, lowering the attachments, setting the parking
brake, stopping the engine, and removing the key.
Disengage power to the attachments when16.
transporting or when not in use.
The machine and attachments should be stopped17.
and inspected for damage after striking a foreign
object, and damage should be repaired before
restarting and operating the machine.
CAUTION
Do not touch the engine or the muffler while the
engine is running or immediately after stopping.
These areas may be hot enough to cause a
burn.
DANGER
DO NOT run the engine inside a building or
a confined area without proper ventilation.
Exhaust fumes are hazardous and contain
carbon monoxide which can cause brain injury
and death.
Keep hands and feet away from cutter blades and18.
moving parts. Contact can injure.
Transport the mower using a heavy duty trailer19.
or truck. Insure the trailer or truck has all of the
necessary lighting and markings as required by
laws, codes, and ordinances. Secure a trailer with a
safety chain.
Be cautious when loading and unloading onto trailers20.
or trucks. Use only a full width ramp. Ramp angle
should be no more than 15 degrees. See Figure 2-4,
Page 8 to determine approximate slope of the ramp.
Back up the ramp and drive down forward.
When transporting the mower, make sure the park21.
brake is engaged, the steering control levers are in
the neutral position, the engine is off with the key
removed, and the wheels have been blocked.

6
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Section 2
WARNING
There is no roll-over protection when the roll bar
is in the down position.
Lower the roll bar only when absolutely
necessary.
Raise the roll bar as soon as clearance permits.
DO NOT wear the seat belt when the roll bar is in
the down position.
ALWAYS wear seat belt when roll bar is in the up
position.
Operate the machine smoothly, no sudden turns,
starts or stops.
Check the area carefully before mowing for proper
overhead clearance (i.e. branches, doorways,
etc.).
DO NOT contact any overhead object with the
roll bar.
Tie the mower down securely using straps, chains,22.
cable, or ropes. Both front and rear straps must be
directed down and outward from machine.
Use care when approaching blind corners, shrubs,23.
trees, or other objects that may obscure vision.
NEVER leave the machine running unattended.24.
ROLL-OVER PROTECTION SYSTEM2.5
WARNING
Keep the roll bar in the raised and locked position
and the seat belt securely fastened during
operation. Failure to do so could cause serious
injury or loss of life.
This mower has been designed for good traction and
stability under normal mowing conditions. However, caution
must be used when traveling on slopes, especially when the
grass is wet. Do not mow on wet grass.Wet grass reduces
traction and steering control.
Any or all parts of the Roll-Over Protection System MUST
NOT be removed. Failure to adhere to this guideline could
result in injury or death.

7
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Section 2
Lower the roll bar only when absolutely necessary.
To lower the roll bar, remove the hairpin cotter pins1.
and remove the two (2) lock pins. See Figure 2-2.
Lower the roll bar to the down position.2.
To raise the roll bar, lift the bar to the upright3.
position.
Install the two (2) lock pins through the hole, secure4.
with the two (2) hairpin cotter pins. See Figure 2-2.
UPRIGHT AND
LOCKED POSITION
Foldable Roll-Over Protection SystemFigure 2-1.
HAIR PIN
LOCK PIN
ROPS HingeFigure 2-2.
The potential exposure of the seat belt to severe
environmental conditions make it crucial to inspect the seat
belt system regularly.
It is recommended that the seat belt be inspected on a
daily basis for signs of damage. Any seat belt system that
shows cuts, fraying, extreme or unusual wear, significant
discoloration due to UV exposure, dirt or stiffness, abrasion
to the seat belt webbing, or damage to the buckle, latch
plate, hardware or any other obvious problem should be
replaced immediately.
WARNING
Failure to properly inspect and maintain the seat
belt can cause serious injury or loss of life.
Check the full length of the seat belt webbing for1.
cuts, wear, fraying, dirt and stiffness. See Figure 2-3.
Check the seat belt webbing in areas exposed to2.
ultra violet rays from the sun or extreme dust or
dirt. If the original color of the webbing in these
areas is extremely faded and/or is packed with dirt,
the physical strength of this webbing may have
deteriorated. If this condition exists, replace the seat
belt system.
Check the buckle and latch for proper operation3.
and determine if the latch plate is excessively worn,
deformed, or if the buckle is damaged or cracked.
See Figure 2-3.
INSPECT WEBBING
INSPECT BUCKLE
& LATCH
Seat Belt InspectionFigure 2-3.

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Section 2
5o
10o
15o
20o
Slope Angle GraphFigure 2-4.
WARNING
Reduce speed when turning, operating on slopes,
slick or wet surfaces. Allow extra distance to
stop.
Stay off of slopes too steep for safe operation.
To check a slope, attempt to back up it (with the
cutter deck down). If the machine can not back
up the slope without the wheels slipping, do not
operate the machine on this slope. Under no
circumstances should the machine be operated
on slopes greater than 15 degrees. See Figure 2-4
to determine approximate slope.
DO NOT mow near drop-offs, ditches or
embankments. The machine could suddenly roll
over if a wheel goes over the edge or if the edge
caves in.
Operate the machine smoothly, no sudden turns,
starts or stops on a slope.
NEVER tow on slopes. The weight of the towed
equipment may cause loss of traction and loss
of control.
DO NOT permit untrained personnel to operate
the machine.
Be cautious when loading and unloading onto
trailers or trucks.
Use only a full width ramp.
Ramp angle should be no more than 15 Degrees.
See Figure 2-4 to help determine approximate
slope.
Back up the ramp and drive down forward.
MAINTENANCE CONSIDERATIONS &2.6
STORAGE
Never make adjustments to the machine with the1.
engine running unless specifically instructed to do
so. If the engine is running, keep hands, feet, and
clothing away from moving parts.
Disengage drives, lower implement, set parking2.
brake, stop engine and remove key or disconnect
spark plug wire to prevent accidental starting of the
engine when servicing or adjusting the machine.
Wait for all movement to stop before adjusting,
cleaning or repairing.
Disconnect battery or remove spark plug wire before3.
making any repairs. Disconnect the negative terminal
first and the positive last. Reconnect the positive first
and the negative last.
Keep all nuts, bolts and screws tight, to ensure the4.
machine is in safe working condition. Check blade
mounting bolts frequently to be sure they are tight.
Do not change the engine governor settings or5.
overspeed the engine. See the engine operator's
manual for information on engine settings.
To reduce fire hazard, keep the cutting units, drives,6.
muffler and engine free of grass, leaves, excessive
grease, oil and dirt.
Park the machine on level ground and engage the7.
parking brake.
NEVER allow untrained personnel to service the8.
machine.
Use care when checking blades. Use a Blade Buddy,9.
wrap the blade(s) or wear gloves and USE CAUTION
when servicing blades. Only replace blades. NEVER
straighten or weld blades.
Keep all parts in good working condition. Replace all10.
worn or damaged decals.
Use jack stands to support components when11.
required.
Carefully release pressure from components with12.
stored energy.

9
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Section 2
WARNING
Hydraulic fluid is under high pressure and can
penetrate skin causing injury. If hydraulic fluid
is injected into the skin, it must be surgically
removed within a few hours by a doctor or
gangrene may result.
Keep body and hands away from pinholes or
nozzles that eject hydraulic fluid under high
pressure.Use paper or cardboard and not hands
to search for leaks.
Safely relieve all pressure from the hydraulic
system by placing the control levers in the neutral
lock position and shutting off the engine before
performing any work on the hydraulic system.
If you need service on your hydraulic system,
please see your authorized Scag dealer.
Let the engine cool before storing.13.
DO NOT store the machine near an open flame.14.
Shut off fuel while storing or transporting.15.
DO NOT store fuel near flames or drain indoors.16.
Charge batteries in an open, well ventilated area,17.
away from spark and flames. Unplug charger before
connecting or disconnecting from battery. Wear
protective clothing and use insulated tools.
USING A SPARK ARRESTOR2.7
The engine in this machine is not equipped with a spark
arrestor muffler. It is in violation of California Public
Resource Code Section 4442 to use or operate this engine
on or near any forest covered, brush covered or grass
covered land unless the exhaust system is equipped with
a spark arrestor meeting any applicable local or state laws.
Other states or federal areas may have similar laws. Check
with your state or local authorities for regulations pertaining
to these requirements.

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Section 2
SAFETY AND INSTRUCTIONAL DECALS2.8
2011 STT-28CAT Decals Sec. 2
481568
FORWARD
REVERSE
FR
483406
483407
483402
483407
483633
483425
484293
484321
484320
Avoid injury from burns
- Shut o engine
- Allow to cool several minutes
- Remove cap slowly
- Do not overll
DIESEL FUEL ONLY
484292
484292
483300
483300
Failure to follow these
instructions could result
in serious injury or death
Do not operate machine on
steep slopes or near drop os
Avoid sharp and/or quick turns
Do not exceed the machine
weight rating on the ROPS
Always use the seat belt
Do not jump if machine tips
while ROPS is fully extended
and using seat belt
If ROPS is foldable:
Keep ROPS fully extended
whenever possible
WHEN ROPS MUST BE DOWN
Do not use the seat belt
Drive with extra care
SERIOUS INJURY
OR DEATH MAY
RESULT FROM
MACHINE ROLLOVER
AVOID SERIOUS INJURY OR DEATH
o
Read the Operators Manual
o
Solicite etiquetas en espanol a un distribudo Scag
o Operate only on slopes you can back up & never
on slopes greater than 15 degrees
o If machine stops going up hill, stop blades and
back down slowly
o Avoid sudden turns
o Do not mow when children or others around
o
Never carry children even with blades o
o Look down and behind before & while backing
o Keep safety devices (guards, shields, switches, etc.)
in place and working
o Remove oblects that could be thrown by the blades
o
Trained operators only
484321
WARNING
READ OPERATOR'S MANUAL
INSTALL BELT COVER
BEFORE OPERATING MACHINE

11
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Section 3
SPECIFICATIONS
ENGINE3.1
General Type ....................................................................................................Heavy Duty Industrial/Commercial Diesel
Brand............................................................................ Kubota 25HP Diesel [Spec. #D902-E2B-KAE-2 (1G447-00000)]
Model.......................................................................................................................................................... Kubota - D902
Horsepower ......................................................................................... 25 HP at 3600 RPM (Model STT61V-25KBD-SS)
Type .....................................................................................4 Stroke Diesel, 3 Cylinder, Horizontal Shaft, Liquid-Cooled
Displacement.............................................................................................................................................. 898 cc Kubota
Cylinders.......................................................................................................................................................................... 3
Governor................................................. Mechanical Type with Variable Speed Control Set At 3200 3670 RPM -Kubota
Idle Speed ........................................................................................................................................................ 1200 RPM
Fuel Pump ................................................................Injection Pump, Bosch MD Mini Type with in-line fuel filter - Kubota
Fuel......................................................................................................... Diesel Fuel with a minimum cetane rating of 40
Oil Pump Group......................................................... Positive Displacement Gerotor™ Oil Pump with Oil Filter - Kubota
Starter............................................................................................................ Electric Starting with Solenoid Shift Starter
Belts:................................................................................................................Kevlar cord. Self-adjusting, Self-tightening
Deck Drive Belt................................................................................................................ Scag Part Number - 481460
Pump Drive Belt ................................................................................................Scag Part Number - 483678 - Kubota
ELECTRICAL3.2
Battery .....................................................................................................................12 Volt, Maintenance Free (525CCA)
Charging System ............................................................................................................................................... Alternator
Charging Output ....................................................................................................................................... 12 Volt, 40 Amp
System Polarity.......................................................................................................................................Negative Ground
Starter.................................................................. 12 Volt Electric Ring Gear Type, Key and Solenoid Operated Interlock
Switches ..................................................................... Seat, Neutral Control, Mower Engagement (BBC), Parking Brake
Instrument Panel ............................................ Volt Meter, Key Switch, Throttle Lever, BBC Switch, Temperature Gauge,
Fuses, Safety Start Module, Oil Pressure Gauge, Glow Plug Indicator
Fuses.................................................................................................................. Two (1) 20 Amp, (1) 50 Amp Resettable
POWER HEAD3.3
Drive System ................Hydraulic Drive with Two Variable Displacement Pumps and Two Cast-iron High Torque Motors
Hydrostatic Pumps ....................................................................... Two Hydro-Gear™ 16cc Pumps with Dump Valves for
movement without running the engine and pressure relief valves
Drive Wheel Motors ..................................................... Two Parker Model TG, 18 cu. Inch Cast-Iron High-Torque Motors
Steering/Travel Control ....................................................................................Twin Lever Fingertip Steering Control with
Individual Control to Each Wheel with Gas Spring Dampers
Parking Brake ...................................................................Lever Actuated Linkage to Brakes on Both Drive Wheel Axles
Wheels:
(2) Front Caster ............................................................................................................................. 13 X 6.00 Flat Free
(2) Drive............................................................. 24X12.0X12 Four-Ply Pneumatic Tubeless, Radius Edge, 61" & 72"
Tire Pressure:
Front Caster....................................................................................................................................................Flat Free
Drive .................................................................................................................................................................. 12 PSI
Fuel Tank .......................................11-Gallon Seamless Polyethylene Tank with large opening and Fuel Gauge Fill Cap
Seat ..........................................................................................................................................Padded, Suspension Seat
Travel Speed:
Forward .................................................................................................................................................................0-10
Reverse ..........................................................................................................................................................0-6 MPH
-NOTE- The machine will travel at 10mph for transport purposes. For best cutting performance the forward travel
speed should be adjusted depending upon the cutting conditions.

12
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Section 3
CUTTER DECK3.4
Type ...........................Floating, Adjustable, Anti-scalping, Hybrid Design Combines Out-front and Belly-mount Designs
Construction ..........................10-gauge steel reinforced with 7-gauge (3/16") Support Plate. 7-gauge (3/16") deck skirt.
True Cutting Width:
61V........................................................................................................................................................61" (155.0 cm)
72V........................................................................................................................................................72" (182.9 cm)
Cutting Height Adjustment.......Foot-Operated Lever Adjustment from Operator's Seat, 1.00" to 6.00" in 1/4"increments
Cutter Blades..................................................................................0.197 Thick, Milled Edge, Wear Resistant Marbain™
61V.............................................................................................................................................. Three (3) 21" blades
72V........................................................................................................................................... Three (3) 24.5" blades
Blade Engagement......................................... Electric Blade Engagement Clutch with Control Panel Switch Connected
to the Cutter Deck Gearbox through a Drive Shaft.
Discharge Opening......................................Extra Wide 11.5" Discharge Opening with Spring Loaded Discharge Chute
Discharge Chute...................................................................................................Black, Polypropylene (Plastic), Flexible
Caster Wheels .................................................................................................................................... 13 X 6.00 Flat Free
Spindles...................................... Heavy-duty 1-1/8" Top Dimension Spindle Shaft, Cast Housing, Taper Roller Bearing,
Low Maintenance with Top Access Grease Fitting and Grease Overfill Relief Poppet
Spindle Pulleys............................................................................................ Split Steel with Easily Removed Taper Hubs
Cutter Deck Belts .............................................................B-section with Kevlar Cord. Self-Adjusting, Self-Tightening
61V.................................................................................................................................. Scag Part Number - 481558
72V.................................................................................................................................. Scag Part Number - 481980
Electric Clutch Type ......................................................................................................................... Ogura Electric Clutch
Drive Shaft............................................................................................Clamp Yoke Shaft With Two High Speed U-Joints
HYDRAULIC SYSTEM3.5
Hydraulic Oil Filter ......................................................................................................... 10 Micron Spin-on Element Type
Hydraulic Reservoir ..................................................................................................................... Nylon; 3 Quart Capacity
WEIGHTS AND DIMENSIONS SMT61V SMT72V3.6
Length...............................................................................................................................87.5"................................87.5"
Tracking Width ................................................................................................................... 55" ....................................55"
Overall Width w/chute down .............................................................................................73.5"...................................83"
Overall Width w/chute up................................................................................................... 62" ....................................73"
Overall Height w/ROPS up ...............................................................................................67.5"................................67.5"
Overall Height w/ROPS down...........................................................................................56.5" ................................56.5"
Operating Weight............................................................................................................. 1540# ............................. 1750#
PRODUCTIVITY SMT61V SMT72V3.7
Cutting Width ..................................................................................................................... 61" ....................................72"
Acres Per Day................................................................................................................... 23.7..................................... 28
The preceding chart will aid you in determining how many acres your Scag mower will cut per day. The chart is an
estimate based on 8 hours per day cutting time at 6 MPH with an allowance for overlap and turns.

13
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Section 4
CAUTION
Do not attempt to operate this mower unless you
have read this manual. Learn the location and
purpose of all controls and instruments before
you operate this mower.
CONTROLS AND INSTRUMENT4.1
IDENTIFICATION
Before operating the mower, familiarize yourself with all
mower and engine controls. Knowing the location, function
and operation of these controls is important for safe and
efficient operation of the mower.
Ignition Switch (Figure 4-1).1. The ignition switch
is used to start the engine and has three positions;
OFF, ON, and START
OPERATING INSTRUCTIONS
Mower Deck Switch (Figure 4-1).2. Used to engage
and disengage the mower drive system. Pulling up
on the switch will engage the deck drive. Pushing
down on the switch will disengage the deck drive.
Glow Plug Indicator (Figure 4-1).3. Yellow indicator
turns on when the key switch is turned to the
PREHEAT position. Glow plugs must be preheated
for 5 to 10 seconds before starting the engine.
Engine Throttle Control (Figure 4-1).4. Used to
control the engine speed. Pushing the lever forward
increases engine speed. Pulling the lever back
decreases engine speed. Full back position is the
IDLE position. Full forward is the cutting position.
Voltmeter (Figure 4-1).5. Indicates the condition of
the charging system. When the engine is running, in
normal operating conditions, the needle should be in
the 12 to 14 volt range.
Oil Pressure (Figure 4-1).6. Indicates engine oil
pressure. Reference the engine operator's manual
for further information.
H
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OFF
OFF
OFF
C
LEFT STEERING
CONTROL
HOURMETER
DUMP VALVE
FUSES
ENGINE
THROTTLE
CONTROL
RIGHT STEERING
CONTROL
DECK LIFT
DECK RELEASE
FUEL GAUGE
PARKING BRAKE
CONTROL CUTTING HEIGHT
ADJUSTMENT
483762
GLOW
PLUGS
OFF ON
START
PREHEAT
MOWER DECK
PULL OUT TO ENGAGE
PUSH IN TO DISENGAGE
WATER TEMPERATURE
MOWER DECK SWITCH
OIL PRESSURE
IGNITION SWITCH
VOLTMETER
GLOW PLUG INDICATORSEAT BELT
Controls and InstrumentsFigure 4-1.

14
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Section 4
Hour meter (Figure 4-1).7. Indicates the number of
hours the engine has been operated. It operates
whenever the key is on. Has preset maintenance
reminders for engine and hydraulic system oil
changes. Will start flashing scheduled maintenance
2 hours before preset time and continue flashing
until 2 hours after. Automatically resets.
Fuse Holders (Figure 4-1).8. There is one 20-amp
fuse and one 50-amp resettable fuse that protects
the mower’s electrical system. To replace fuse, pull
fuse out of the socket and install a new fuse.
Left Steering Control (Figure 4-1).9. Used to control
the mower's left wheel when traveling forward or
reverse.
Right Steering Control (Figure 4-1).10. Used to
control the mower's right wheel when traveling
forward or reverse.
Parking Brake Control (Figure 4-1).11. Used to
engage and disengage the parking brakes. Pull the
lever back to engage the parking brakes. Push the
lever forward to disengage the parking brakes.
Fuel Tank Gauge (Figure 4-1)12. . Indicates the
amount of fuel in the fuel tank.
Dump Valve Control Levers (Figure 4-2).13. Located
on the hydraulic pumps, used to “free-wheel” the
mower. Rotating the levers clockwise until they stop
allows the unit to move under hydraulic power. The
levers must be in this position and torqued to 10ft/lbs
during operation of the mower. Rotating the levers
counter-clockwise allows the mower to be moved by
hand (free-wheeling).
DUMP VALV E
CONTROL
2007 STTDVC
Dump Valve ControlFigure 4-2.
Deck Lift Foot Lever (Figure 4-1).14. Used to raise
and lower the cutter deck.
Cutting Height Adjustment (Figure 4-1).15. Used to
set the cutter deck at the desired cutting height.
Deck Release Lever (Figure 4-1).16. Used to lock
the cutter deck in the transport position. Push the
foot pedal forward and lift up on the release lever to
release the cutter deck for normal mowing.
Temperature Gauge (Figure 4-1).17. Indicates the
operating temperature of the engine.
Seat Belt (Figure 4-1).18. Used to secure the operator.
Seat belt must be worn at all times when the ROPS
is in the upright and locked position.
Seat Hold Down Release Latch.19. Located behind
the seat. Used to secure the seat in the operator's
position. Release the latch to gain access under the
seat.
SAFETY INTERLOCK SYSTEM4.2
The mower is equipped with a safety interlock system
that prevents the engine from starting unless the deck
drive is disengaged, the parking brake is engaged, the
steering control levers are in the neutral position and the
operator is in the seat. The interlock system shuts off the
engine if the operator leaves the seat with the steering
control levers not in the neutral position and/or the cutter
blades engaged and the parking brake not engaged.
WARNING
Never operate the mower with the interlock
system disconnected or malfunctioning. Do not
disengage or bypass any switch; injury to yourself
and others or property damage could result.

15
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Section 4
INITIAL RUN-IN PROCEDURES (FIRST4.3
DAY OF USE OR APPROXIMATELY 10
HOURS)
Check all belts for proper alignment and wear at 2, 41.
and 8 hours.
Change the engine oil and oil filter after the first 202.
hours of operation. (See Section 7.4.)
Check hydraulic oil level in reservoir. (See Section3.
7.3.)
Check for loose hardware. Tighten as needed.4.
Check interlock system for proper operation. (See5.
Section 4.2.)
Check tire pressure. Adjust pressure if necessary.6.
(See Section 7.10)
STARTING THE ENGINE4.4
CAUTION
DO NOT USE STARTING FLUIDS. Use of starting
fluids in the air intake system may be potentially
explosive or cause a “runaway” engine condition
that could result in engine damage and/or
personal injury.
Be sure the fuel shutoff valve, located behind the1.
operator's seat, is completely open.
Secure the ROPS in the upright and locked position.2.
Sit in the operator’s seat, fasten seat belt and place3.
the steering control levers in the neutral position.
Engage the parking brake.4.
Place the PTO switch in the disengaged position.5.
Move the engine throttle control to about half engine6.
speed.
Turn the ignition key to the on position until the7.
yellow indicator for the glow plugs goes out. Then
turn the ignition key to the START position and
release the key as soon as the engine starts. Do
not hold the key in the START position for more
than 15 seconds at a time. Allow at least 60
seconds between each cranking attempt to prevent
overheating of the starter motor. Prolonged cranking
can damage the starter motor and shorten battery
life.
Allow engine to warm before operating the mower.8.
GROUND TRAVEL AND STEERING4.5
- IMPORTANT -
If you are not familiar with the operation of a
machine with lever steering and/or hydrostatic
transmissions, the steering and ground speed
operations should be learned and practiced in
an open area, away from buildings, fences, or
obstructions. Practice until you are comfortable
with the handling of the machine before attempting
to mow. Learn the operation on flat ground before
operating on slopes.
- IMPORTANT -
Start practicing with a slow engine speed and slow
forward travel.
Learn to feather the steering controls to obtain a
smooth operating action.
Practice operating the mower until you are
comfortable with the controls before proceeding
to mow.
FORWARD TRAVEL
To travel forward with the mower, disengage the parking
brake, pull levers inward out of the neutral lock position
and slowly push the steering control levers forward an
equal distance. The further the steering control levers are
pushed forward, the greater the forward speed will be. To
increase the speed, push the steering control levers further
forward and to decrease the speed, pull the steering control
levers back.
To stop the forward travel, pull the steering control levers
back to the neutral position.
To steer the mower left while traveling forward, pull the left
steering lever back.The further the lever is pulled back, the
quicker the mower will turn left.
To steer the mower right while traveling forward, pull the
right steering control lever back. The further the lever is
pulled back, the quicker the mower will turn right.
- NOTE -
Smooth operation of the steering levers will
produce smooth mower operation. While learning
the operation of the steering controls, keep the
travel speed low.

16
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Section 4
- IMPORTANT -
Do not travel forward over a curb. The mower will
hang up on the curb. Raise the deck and travel
backwards over the curb at a 45 degree angle. (see
Section 4.13 on Page 19 for cutter deck raising
instructions)
REVERSE TRAVEL
CAUTION
Disengage power to the mower before backing
up. Do not mow in reverse unless absolutely
necessary and then only after observation of the
entire area behind the mower.
CAUTION
Before backing up, observe the rear for persons
and obstructions. Clear the area before backing
up. Possible injury or property damage could
occur.
To travel in reverse, pull levers inward out of the neutral
lock position and pull both handles back. Keep the travel
speed low while traveling in reverse.
- NOTE -
The mower may not travel straight in reverse.
Slight adjustments may need to be made using
the steering controls.
To steer left while traveling in reverse, allow the left steering
control lever to move forward. The further the control is
allowed to move forward, the quicker the mower will turn
left.
To steer right while traveling in reverse, allow the right
steering control lever to move forward. The further the
control is allowed to move forward, the quicker the mower
will turn right.
To stop the reverse travel, allow the steering control levers
to return to the neutral position. If the mower is to be parked,
place the handles in the neutral lock position and engage
the parking brake.
ENGAGING THE DECK DRIVE (CUTTER4.6
BLADES)
Set the throttle at about 3/4 speed. Do not attempt to1.
engage the deck drive at high speed as this shortens
the electric clutch life — use only moderate engine
speed when engaging the deck drive.
Engage the deck drive by pulling out on the yellow2.
switch, located on the instrument panel, (Figure 4-3)
to the engage position.
390S0138
PULL UP TO ENGAGE
PUSH DOWN TO DISENGAGE
Cutter Engage SwitchFigure 4-3.
- NOTE -
A squealing noise may be heard when engaging
or disengaging the deck drive. It is caused by the
electric clutch plates meshing as the mower comes
up to speed.
To disengage the deck drive, push the switch in to3.
the disengage position.
Always operate the engine at full throttle to properly4.
maintain cutting speed. If the engine starts to lug
down, reduce the forward speed and allow the
engine to operate at maximum RPM.