Scag Power Equipment TIGER CAT STC48V-19KAI User manual

PART NO. 03250 Rev.4
PRINTED 11/2009
PRINTED IN USA
© 2009
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 efficiency. The specific models that
this book covers are listed on the inside cover. Before operating your machine,
please read all the information enclosed.
OPERATOR’S
MANUAL
TigerCat
Models: STC48V-19KAI
STC48V-23CV
STC48V-25CV
STC48V-25CV-SS
STC48V-26BS
STC52V-25CV
STC52V-27CV
STC52V-27CV-SS
STC61V-25CV
STC61V-27CV
STC61V-27CV-SS

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:
STC48V-19KAI with a serial number of E4600001 to E4699999
STC48V-23CV with a serial number of E4700001 to E4799999
STC48V-25CV with a serial number of E9000001 to E9099999
STC48V-25CV-SS with a serial number of E9300001 to E9399999
STC48V-26BS with a serial number of E4800001 to E4899999
STC52V-25CV with a serial number of E4900001 to E4999999
STC52V-27CV with a serial number of E6200001 to E6299999
STC52V-27CV-SS with a serial number of E8900001 to E8999999
STC61V-25CV with a serial number of E5000001 to E5099999
STC61V-27CV with a serial number of E6300001 to E6399999
STC61V-27CV-SS with a serial number of E9200001 to E9299999
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 SAFETY AND INSTRUCTIONAL DECALS.................................................................................................9
SPECIFICATIONSSECTION 3 - ..............................................................................................10
3.1 ENGINE ......................................................................................................................................................10
3.2 ELECTRICAL .............................................................................................................................................10
3.3 TRACTOR ...................................................................................................................................................10
3.4 CUTTER DECK ..........................................................................................................................................11
3.5 HYDRAULIC SYSTEM ...............................................................................................................................11
3.6 WEIGHTS AND DIMENSIONS...................................................................................................................11
3.7 PRODUCTIVITY .........................................................................................................................................11
OPERATING INSTRUCTIONSSECTION 4 - ...........................................................................12
4.1 CONTROLS AND INSTRUMENT IDENTIFICATION ................................................................................12
4.2 SAFETY INTERLOCK SYSTEM ................................................................................................................13
4.3 INITIAL RUN-IN PROCEDURES................................................................................................................13
4.4 STARTING THE ENGINE ...........................................................................................................................14
4.5 GROUND TRAVEL AND STEERING .........................................................................................................14
4.6 ENGAGING THE DECK DRIVE (CUTTER BLADES)................................................................................15
4.7 HILLSIDE OPERATION..............................................................................................................................16
4.8 PARKING THE MOWER.............................................................................................................................16
4.9 AFTER OPERATION ..................................................................................................................................16
4.10 REMOVING CLOGGED MATERIAL ........................................................................................................16
4.11 MOVING MOWER WITH ENGINE STOPPED..........................................................................................17
4.12 RECOMMENDATIONS FOR MOWING....................................................................................................17
4.13 ADJUSTING CUTTING HEIGHT..............................................................................................................17
4.14 TOWING (OPTIONAL HITCH ACCESSORY)...........................................................................................18
TROUBLESHOOTING CUTTING CONDITIONSSECTION 5 - ...............................................19

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Table of Contents
ADJUSTMENTSSECTION 6 - .................................................................................................22
6.1 PARKING BRAKE ADJUSTMENT ............................................................................................................22
6.2 TRAVEL ADJUSTMENTS ..........................................................................................................................22
6.3 THROTTLE CONTROL AND CHOKE ADJUSTMENTS............................................................................24
6.4 BELT ADJUSTMENT .................................................................................................................................24
6.5 BELT ALIGNMENT.....................................................................................................................................24
6.6 CUTTER DECK ADJUSTMENTS ..............................................................................................................24
6.7 CUSTOM-CUT BAFFLE ADJUSTMENT ...................................................................................................26
6.8 ELECTRIC CLUTCH ADJUSTMENT.........................................................................................................27
MAINTENANCESECTION 7 - ..................................................................................................28
7.1 MAINTENANCE CHART - RECOMMENDED SERVICE INTERVALS ......................................................28
7.2 LUBRICATION............................................................................................................................................29
7.3 HYDRAULIC SYSTEM ...............................................................................................................................31
7.4 ENGINE OIL ..............................................................................................................................................32
7.5 ENGINE FUEL SYSTEM ............................................................................................................................32
7.6 ENGINE AIR CLEANER.............................................................................................................................33
7.7 BATTERY....................................................................................................................................................34
7.8 DRIVE BELTS.............................................................................................................................................35
7.9 CUTTER BLADES......................................................................................................................................35
7.10 TIRES........................................................................................................................................................36
7.11 BODY, DECK, AND UPHOLSTERY .........................................................................................................36
ILLUSTRATED PARTS LISTSECTION 8 - ..............................................................................37
8.1 SCAG APPROVED ATTACHMENTS AND ACCESSORIES......................................................................37
48V & 52V CUTTER DECKS ...........................................................................................................................38
61V CUTTER DECK.........................................................................................................................................40
CUTTER DECK CONTROLS ...........................................................................................................................42
SHEET METAL COMPONENTS ......................................................................................................................44
STC FOLDABLE ROLL-OVER PROTECTION SYSTEM ................................................................................46
STC SUSPENSION SEAT ................................................................................................................................48
NOTES..............................................................................................................................................................49
DRIVE SYSTEM COMPONENTS ....................................................................................................................50
ENGINE & ATTACHING PARTS.......................................................................................................................52
STEERING COMPONENTS.............................................................................................................................54
BRAKE COMPONENTS ..................................................................................................................................56
WHEEL MOTOR PART NUMBER IDENTIFICATION ......................................................................................58
NOTES..............................................................................................................................................................59
FUEL AND HYDRAULIC SYSTEM ..................................................................................................................60
ELECTRICAL SYSTEM ...................................................................................................................................62
BDP-10A HYDRAULIC PUMP ASSEMBLY.....................................................................................................64
REPLACEMENT DECALS AND INFORMATION PLATES .............................................................................66
ELECTRICAL SCHEMATIC .............................................................................................................................68
LIMITED WARRANTY - COMMERCIAL EQUIPMENT.........................Following Section 8

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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
BYOTHERTHANTHEMANUFACTURER'SAUTHORIZED
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.
Model
Serial
SCAG
STC 2001 SPL-1
SERIAL NUMBER
PLATE LOCATION
Power Equipment
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, Paragraph 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
STT MODELS
Seat must be installed under the seat
hold down bracket during installation.
Failure to secure the seat under the hold
down bracket could result in serious
injury or death in a roll over.
CE Mark
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 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
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.
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.
SAFETY INFORMATION

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Section 2
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.
Equipment must comply with the latest requirements14.
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 chute15.
installed and in the down position or with an optional
grass catcher or mulch plate completely installed.
Check the blade mounting bolts at frequent intervals16.
for proper tightness.
Make sure all hydraulic fluid connections are tight17.
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. ALWAYS FOLLOW OSHA APPROVED
OPERATION.
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.

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Section 2
To prevent tipping or loss of control, start and stop3.
smoothly, avoid unnecessary turns and travel at
reduced speed.
When using any attachment, never direct the4.
discharge of material toward bystanders or allow
anyone near the machine while in operation.
Before attempting to start the engine, with the5.
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 the6.
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 hidden7.
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.8.
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.9.
Disengage power to cutter deck before crossing10.
roads, walks or gravel drives.
Mow only in daylight or good artificial light.11.
NEVER raise the deck with the blades engaged.12.
Take all possible precautions when leaving the13.
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 when14.
transporting or when not in use.
The machine and attachments should be stopped15.
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 and16.
moving parts. Contact can injure.
Transport the mower using a heavy duty trailer17.
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 onto18.
trailers or trucks. Use only a full width ramp. Ramp
angle should be no more than 15 degrees. Back up
the ramp and drive down forward.
When transporting the mower, make sure the park19.
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,20.
cable, or ropes. Both front and rear straps must be
directed down and outward from machine.
Use care when approaching blind corners, shrubs,21.
trees, or other objects that may obscure vision.
NEVER leave the machine running unattended.22.

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Section 2
Lower the roll bar only when absolutely necessary.
To lower the roll bar, loosen the tension knob on both1.
the left hand and right hand bar. See Figure 2-1.
Remove the hairpin cotter pins and remove the two2.
(2) lock pins. See Figure 2-2.
Lower the roll bar to the down position.3.
To raise the roll bar, lift the bar to the upright4.
position.
Install the two (2) lock pins through the hole, secure5.
with the two (2) hairpin cotter pins and tighten the
tension knobs. See Figure 2-2. Remove the seat belt
from the retainer brackets.
UPRIGHT AND
LOCKED POSITION
TENSION
KNOBS
Foldable Roll-Over Protection SystemFigure 2-1.
TENSION
KNOB
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.
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.