Scag Power Equipment Turf Tiger STT52V-26CH-EFI User manual

PART NO. 03364
PRINTED 9/2013
PRINTED IN USA
© 2013
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
TurfTiger
Models: STT52V-26CH-EFI
STT61V-25KA
STT61V-26CH-EFI
STT61V-26DFI
STT61V-35BVAC
STT72V-26CH-EFI
STT72V-26DFI
STT72V-35BVAC

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 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:
STT52V-26CH-EFI with a serial number of K1400001 to K1499999
STT61V-25KA with a serial number of K1700001 to K1799999
STT61V-26CH-EFI with a serial number of K1900001 to K1999999
STT61V-26DFI with a serial number of K2000001 to K2099999
STT61V-35BVAC with a serial number of K2200001 to K2299999
STT72V-26CH-EFI with a serial number of K2500001 to K2599999
STT72V-26DFI with a serial number of K2600001 to K2699999
STT72V-35BVAC with a serial number of K2700001 to K2799999
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.....................................................................................................................8
2.8 SPARK IGNITION SYSTEM .........................................................................................................................8
2.9 SAFETY AND INSTRUCTIONAL DECALS.................................................................................................9
SPECIFICATIONSSECTION 3 - ..............................................................................................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
OPERATING INSTRUCTIONSSECTION 4 - ...........................................................................13
4.1 CONTROLS AND INSTRUMENT IDENTIFICATION ................................................................................13
4.2 SAFETY INTERLOCK SYSTEM ................................................................................................................14
4.3 INITIAL RUN-IN PROCEDURES................................................................................................................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..............................................................................................................18
4.14 ADJUSTING THE STEERING LEVERS...................................................................................................19
4.15 ADJUSTING THE HEIGHT ADJUST PEDAL ..........................................................................................19
4.16 TOWING (OPTIONAL HITCH ACCESSORY)...........................................................................................20

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Table of Contents
TROUBLESHOOTING CUTTING CONDITIONSSECTION 5 - ...............................................21
ADJUSTMENTSSECTION 6 - .................................................................................................24
6.1 PARKING BRAKE ADJUSTMENT ............................................................................................................24
6.2 TRAVEL ADJUSTMENTS ..........................................................................................................................25
6.3 THROTTLE CONTROL AND CHOKE ADJUSTMENTS ............................................................................26
6.4 BELT ADJUSTMENT .................................................................................................................................26
6.5 BELT ALIGNMENT.....................................................................................................................................27
6.6 CUTTER DECK ADJUSTMENTS ..............................................................................................................27
6.7 CUSTOM-CUT BAFFLE ADJUSTMENT ...................................................................................................29
6.8 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....................................................................................................................................................37
7.8 DRIVE BELTS.............................................................................................................................................38
7.9 CUTTER BLADES......................................................................................................................................38
7.10 TIRES........................................................................................................................................................40
7.11 CUTTER DECK GEARBOX .....................................................................................................................40
7.12 COOLING SYSTEM .................................................................................................................................40
7.13 BODY, DECK, AND UPHOLSTERY .........................................................................................................41
NOTES..............................................................................................................................................................42
ILLUSTRATED PARTS LISTSECTION 8 - ..............................................................................43
8.1 SCAG APPROVED ATTACHMENTS AND ACCESSORIES......................................................................43
52V CUTTER DECK.........................................................................................................................................44
61V & 72VS CUTTER DECKS .........................................................................................................................46
CUTTER DECK CONTROLS ...........................................................................................................................48
SHEET METAL COMPONENTS ......................................................................................................................50
STT ROLL-OVER PROTECTION SYSTEM .....................................................................................................52
STT SUSPENSION SEAT ................................................................................................................................54
NOTES..............................................................................................................................................................55
DECK DRIVE COMPONENTS .........................................................................................................................57
ENGINE AND ATTACHING PARTS - KOHLER ...............................................................................................58
ENGINE & ATTACHING PARTS - 25KA, 26DFI KAWASAKI & 35BVAC........................................................60
BRAKE AND STEERING COMPONENTS ......................................................................................................62
STT HYDRAULIC SYSTEM .............................................................................................................................64
STT FUEL SYSTEM .........................................................................................................................................66
BDP-16A HYDRAULIC PUMP ASSEMBLY.....................................................................................................68

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Table of Contents
BDP-16A HYDRAULIC PUMP ASSEMBLY WITH COOLING FAN (26DFI & 35BVAC) .................................70
ELECTRICAL SYSTEM - 25KA - KAWASAKI.................................................................................................72
ELECTRICAL SYSTEM - 26CH-EFI - KOHLER ..............................................................................................74
ELECTRICAL SYSTEM - 26DFI - KAWASAKI ................................................................................................76
ELECTRICAL SYSTEM - 35BVAC - BRIGGS & STRATTON .........................................................................78
REPLACEMENT DECALS AND INFORMATION PLATES .............................................................................80
STT ELECTRICAL SCHEMATIC (25KA - KAWASAKI) ..................................................................................82
STT ELECTRICAL SCHEMATIC (26CH-EFI - KOHLER)................................................................................83
ELECTRICAL SCHEMATIC (26DFI - KAWASAKI) .........................................................................................84
STT ELECTRICAL SCHEMATIC (35BVAC BRIGGS & STRATTON) .............................................................85
LIMITED WARRANTY - COMMERCIAL EQUIPMENSECTION 9 - T ................ Following Section 8

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Table of Contents

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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.
- 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
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
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 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.
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 7 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 7 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.
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.

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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.
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.
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.

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Section 2
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.
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.

8
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Section 2
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.
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 (excluding the 35BVAC) 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.
SPARK IGNITION SYSTEM2.8
This spark ignition system complies with Canadian
ICES-002.

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Section 2
SAFETY AND INSTRUCTIONAL DECALS2.9
WARNING
INSTALL BELT COVER BEFORE
OPERATING MACHINE
READ OPERATOR'S MANUAL 483402
390S0150i
481568
FORWARD
REVERSE
FR
483397
483406
483407 483402
484320
483407
483633
483425
483300
WARNING
Operation of this equipment
may create sparks that can
start res around dry
vegetation. A spark
arrestor may be required.
The operator should contact
local re agencies for laws
or regulations relating to
re prevention requirements.
483900
483900
(supplied with California
models only)
483397
484293
484321

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Section 3
SPECIFICATIONS
ENGINE3.1
General Type ................................................................................................Heavy Duty Industrial/Commercial Gasoline
Model:
Scag Model STT61V-25KA ............................................................................................................ Kawasaki FD750D
Scag Model STT52V-26CH-EFI, STT61V-26CH-EFI, STT72V-26CH-EFI ........................Kohler Command ECH749
Scag Model STT61V-26DFI, STT72V-26DFI.................................................................................. Kawasaki FD791D
Scag Model STT61V-35BVAC, STT72V-35BVAC .............................................................Briggs & Stratton Vanguard
Displacement:
Kohler 26CH-EFI (ECH749) ............................................................................................................................... 747cc
Kawasaki 25KA (FD750D) and 26DFI (FD791D)............................................................................................... 745cc
Briggs & Stratton 35BVAC.................................................................................................................................. 993cc
Type:
Kawasaki (FD750D) .............................................................4-Cycle, Air-Cooled, Naturally Aspirated Gasoline, OHV
Kohler (ECH749) .......................................................... 4-Cycle, Air Cooled, Electronic Fuel Injection Gasoline, OHV
Kawasaki (FD791D) ..................................................... 4-Cycle, Liquid-Cooled, Digital Fuel Injection Gasoline, OHV
Briggs & Stratton .................................................................................4-Cycle, Air-Cooled, Naturally Aspirated, OHV
Cylinders..................................................................................................................................... 2 with Cast Iron Sleeves
Governor........................................................................Mechanical Type with Variable Speed Control Set At 3800 RPM
Idle Speed:
Kohler .......................................................................................................................................................... 1400 RPM
Kawasaki ..................................................................................................................................................... 1400 RPM
Briggs & Stratton ......................................................................................................................................... 1750 RPM
Carburation:
Kawasaki (FD750D) ................................................................................................... Fixed Jet Downdraft Carburetor
Kohler (ECH749) ....................................................................................................................Electronic Fuel Injection
Kawasaki (FD791D) .....................................................................................................................Digital Fuel Injection
Briggs & Stratton .......................................................................................................... Fixed Jet Sidedraft Carburetor
Fuel Pump:
Kohler .................................................................................................................... Mechanical with In-Line Fuel Filter
Kawasaki .............................................................................................. High Pressure Electric with In-Line Fuel Filter
Briggs & Stratton ................................................................................................... Mechanical with In-Line Fuel Filter
Fuel...................................................................................... Non-Leaded Gasoline with a Minimum Octane Rating of 87
Oil Pump...........................................................................................................................Full Pressure w/Full-Flow Filter
Starter........................................................................................................................ Electric Starting with Solenoid Shift
Belts................................................................................................................ Kevlar cord, Self-adjusting, Self-tightening
ELECTRICAL3.2
Battery .................................................................................................................................................................... 12 Volt
Charging System............................................................................................................................................... Alternator
Charging Output:
Kohler (ECH749) .................................................................................................................................12 Volt, 20 Amp
Kawasaki .............................................................................................................................................12 Volt, 20 Amp
Briggs & Stratton .................................................................................................................................12 Volt, 20 Amp
System Polarity....................................................................................................................................... Negative Ground
Interlock Switches....................................................... Seat, Neutral Control, Mower Engagement (BBC), Parking Brake
Instrument Panel ................... Ammeter, Volt Meter (ECH749), Key Switch, Throttle Lever, Manual Choke, BBC Switch,
Fuses and Safety Start module, Temp. Gauge (FD750D, FD791D), Check Engine Indicator (ECH749, FD791D)
Fuses........................................................................................................................................................ Two (2) 20 Amp

11
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Section 3
POWER HEAD3.3
Drive System ............... Hydraulic Drive with Two Variable Displacement Pumps and Two Cast-Iron High Torque Motors
Hydrostatic Pumps ..................................................................... Two Hydro-Gear™ 16 cc/rev. Pumps with Dump Valves
Drive Wheel Motors: ......................................................Two Parker Model TG 15 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 - (52" Deck) .......................................................................................... 13 X 5.00 Four-Ply, Flat Free
(2) Front Caster - (61" & 72" Deck) ................................................................................ 13 X 6.50 Four Ply, Flat Free
(2) Drive - (52" Deck).................................................... 23 X 10.50 X 12 Four-Ply Pneumatic Tubeless, Radius Edge
(2) Drive - (61" & 72" Deck) ................................................ 24 x 12 x 12 Four-Ply Pneumatic Tubeless, Radius Edge
Tire Pressure:
Front Caster....................................................................................................................................................Flat Free
Drive .................................................................................................................................................................. 12 PSI
Fuel Tank ................................8-1/2-Gallon Seamless Polyethylene Tank with Large Opening, Fuel Gauge and Fill Cap
Seat ...........................................................................................................................................Padded Suspension Seat
Travel Speed........................................................................................................... 750KA/26CH-EFI ........ 791DFI/35BV
Forward.................................................................................................................... 0 up to 10 MPH....... 0 up to 12 MPH
Reverse .................................................................................................................... 0 up to 5 MPH.......... 0 up to 6 MPH
-NOTE- The machine will travel up to 10 mph or 12 mph for transport purposes. For best cutting performance the
forward travel speed should be adjusted depending upon the cutting conditions.
CUTTER DECK3.4
Type ......................... Floating, Adjustable, Anti-Scalping, Hybrid Design Combines Out-Front and Belly-Mount Designs
Construction ............................................................................................................................Tri-Plate deck construction
Top of deck consists of three steel plates totaling nearly 1/2" of steel., 7-gauge (3/16") deck skirt.
True Cutting Width:
52V........................................................................................................................................................52" (132.0 cm)
61V........................................................................................................................................................61" (155.0 cm)
72VS...................................................................................................................................................71.5" (181.6 cm)
Cutting Height Adjustment...........Foot-Operated Lever Adjustment from Operator's Seat, 1.0" to 6.0" in 1/4"increments
Cutter Blades.........................................................................197 or .250 Thick, Milled Edge, Wear Resistant Marbain™
52V.............................................................................................................................................. Three (3) 18" blades
61V.............................................................................................................................................. Three (3) 21" blades
72VS......................................................................................................................................... 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 Discharge Opening with Spring-Loaded Discharge Chute and Turbo Baffle
Discharge Chute...................................................................................................Black, Polypropylene (Plastic), Flexible
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
Electric Clutch Type ................................................................................................Ogura Heavy Duty PTO Clutch Brake
Drive Shaft............................................................................................Clamp Yoke Shaft With Two High-Speed U-Joints

12
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Section 3
HYDRAULIC SYSTEM3.5
Hydraulic Oil Filter ........................................................................................................ 10 Micron Spin-on Element Type
Hydraulic Reservoir .....................................................................................................................Nylon; 3 Quart Capacity
WEIGHTS AND DIMENSIONS 52V 61V 72VS3.6
Length......................................................................................... 83" ...............................87.5" ...................................90"
Tracking Width ............................................................................ 51" ................................ 56" ....................................56"
Overall Width w/chute down ...................................................... 64.5"..............................73.5" ...................................83"
Overall Width w/chute up............................................................ 53" ................................ 62" ....................................73"
Overall Height w/ROPS up ........................................................ 67.5"..............................67.5"................................67.5"
Overall Height w/ROPS down.................................................... 56.5"..............................56.5"................................56.5"
Operating Weight w/ROPS ....................................................... 1250# ............................ 1350# ............................. 1400#
Operating Weight w/ROPS and 35BV Engine .............................NA ..............................1445# ............................. 1495#
PRODUCTIVITY 52V 61V 72VS3.7
Cutting Width .............................................................................. 52" ................................ 61" ....................................72"
Acres Per Day.............................................................................20.2 .............................. 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 a 20% 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.
Engine Choke Control (Figure 4-1).3. Used to start
a cold engine. Not used on the 791DFI or 29CH-EFI.
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.
Ammeter (Figure 4-1).5. Indicates the condition of
the charging system. When the engine is running
the needle should be toward the positive end of the
meter. If the needle is toward the negative end of the
meter, this indicates a discharge condition and the
machine should be taken in for service.
CHOKE
481348
F
LEFT STEERING
CONTROL
MOWER DECK
IGNITION SWITCH
FUEL
GAUGE
DUMP VALV E
DUMP VALV E
FUSES
ENGINE
CHOKE
CONTROL
ENGINE THROTTLE
CONTROL
RIGHT STEERING
CONTROL
DECK LIFT
DECK RELEASE
2012 STT CHMI
PARKING BRAKE
CONTROL
CUTTING HEIGHT
ADJUSTMENT
DFI & EFI ONLY
AMMETER
SWITCH
WATER TEMPERATURE
CHECK
ENGINE
LIGHT
CHECK
ENGINE LIGHT
482796
SLOW FAST
HOUR METER
SEAT BELT
PUSH IN TODISENGAGE
MOWER DECK
PULL OUT TO ENGAGE
VOLT METER
Controls and InstrumentsFigure 4-1.

14
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Section 4
Voltmeter (Figure 4-1).6. 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.
Hourmeter (Figure 4-1).7. Indicates the number of
hours the engine has been operated. It only operates
when the engine is running. 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. Two 20-amp fuses
protect the mower’s electrical system. To replace
fuses, 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 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 10 lb-ft
during operation of the mower. Rotating the levers
counter-clockwise allows the mower to be moved by
hand (free-wheeling).
390S141-1
DUMP VALVE
CONTROL
Dump Valve ControlFigure 4-2.
Deck Lift Foot Lever (Figure 4-1).14. Used to raise
and lower the cutter deck. Push full forward to lock in
the transport position.
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 pull back 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. Used on
mowers with the liquid-cooled engine only.
Check Engine Light (Figure 4-1).18. Indicates the
operation of the engine sensors on the Fuel Injection
Engines (DFI or EFI). If a problem occurs with a
sensor on the engine, the light will flash a code.
See your authorized Scag Dealer for diagnosis and
repair.
Seat Belt (Figure 4-1).19. 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 (Figure 4-1).20.
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.