Scag Power Equipment STC User manual

MODEL STC
OPERATOR’S MANUAL
THIS MANUAL CONTAINS THE OPERATING
INSTRUCTIONS AND SAFETY INFORMA-
TION FOR YOUR SCAG MOWER. READING
THIS MANUAL CAN PROVIDE YOU WITH
ASSISTANCE IN MAINTENANCE AND AD-
JUSTMENT PROCEDURES TO KEEP YOUR
MOWER PERFORMING TO MAXIMUM EFFI-
CIENCY. THE SPECIFIC MODELS THAT THIS
BOOK COVERS ARE CONTAINED ON THE
INSIDE COVER. BEFORE OPERATING YOUR
MACHINE, PLEASE READ ALL THE INFOR-
MATION ENCLOSED.
PART NUMBER 03079

FAILURE TO FOLLOW SAFE OPERATING PRACTICES
MAY RESULT IN SERIOUS INJURY.
* 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.
* Read this manual completely as well as other manuals that came
with your mower.
* Keep others off the tractor 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:
STC40-17KA with a erial number of 5810000 to 5819999
STC48-19KA with a erial number of 5870000 to 5879999
STC48A-19KA with a erial number of 5880000 to 5889999
STC48-20CV with a erial number of 5980000 to 5989999
STC48A-20CV with a erial number of 6020000 to 6029999
STC48-21KA with a erial number of 5820000 to 5829999
STC48A-21KA with a erial number of 5890000 to 5899999
STC52A-21KA with a erial number of 5900000 to 5909999
STC52A-23KA with a erial number of 5910000 to 5919999
Always use the entire serial number listed on the serial number
tag when referring to this product.
WARNING:

I
TABLE OF CONTENTS
SUBJECT PAGE
Section 1 - General Information
1.1 Introduction .............................................................................................................................1
1.2 Directional Reference .............................................................................................................1
1.3 Servicing the Engine and Drive Train Components ................................................................1
Section 2 - Safety Information
2.1 Introduction .............................................................................................................................2
2.2 Signal Words ...........................................................................................................................2
2.3 efore Operation Considerations ...........................................................................................2
2.4 Operation Considerations ........................................................................................................3
2.5 Maintenance Considerations ...................................................................................................4
2.6 Safety and Instructional Decals ..............................................................................................5
Section 3 - Specifications ....................................................................................................... 6-7
Section - Operating Instructions
4.1 Controls and Instrument Identification ....................................................................................8
4.2 Safety Interlock System ..........................................................................................................9
4.3 Initial Run-In Procedures ........................................................................................................9
4.4 Starting the Engine ................................................................................................................ 10
4.5 Ground Travel and Steering ..................................................................................................10
4.6 Engaging the Deck Drive ..................................................................................................... 11
4.7 Hillside Operation .................................................................................................................12
4-8 Parking the Mower ...............................................................................................................12
4.9 After Operation ....................................................................................................................12
4.10 Removing Clogged Material .................................................................................................13
4.11 Moving Mower with Engine Stopped ...................................................................................13
4.12 Recommendations for Mowing ............................................................................................. 13
4.13 Adjusting Cutting Height .......................................................................................................14
Section 5 - Troubleshooting Cutting Conditions .............................................................. 15-17

II
TABLE OF CONTENTS (CONT'D)
SUBJECT PAGE
Section 6 - Adjustments
6.1 Parking rake Adjustment ................................................................................................... 18
6.2 Travel Adjustments .............................................................................................................. 18
6.3 Throttle Control and Choke Adjustments ............................................................................. 20
6.4 elt Adjustment ................................................................................................................... 20
6.5 elt Alignment ..................................................................................................................... 20
6.6 Cutter Deck Adjustments ..................................................................................................... 21
Section 7 - Maintenance
7.1 Maintenance Chart ............................................................................................................... 23
7.2 Lubrication Fitting Points .................................................................................................... 24
7.3 Hydraulic System ................................................................................................................. 26
7.4 Engine Oil ............................................................................................................................ 27
7.5 Engine Fuel System .............................................................................................................. 27
7.6 Engine Air Cleaner ................................................................................................................ 28
7.7 attery .................................................................................................................................. 29
7.8 Drive elts ............................................................................................................................30
7.9 Cutter lades ........................................................................................................................ 30
7.10 Tires ...................................................................................................................................... 31
7.11 ody, Deck, and Upholstery ................................................................................................. 32
Section 8 - Replacement Parts
40" Cutter Deck ........................................................................................................................ 34-35
48:, 48A, 52A Cutter Deck ....................................................................................................... 36-37
Cutter Deck Controls ................................................................................................................ 38-39
Sheet Metal Components .......................................................................................................... 40-41
Drive System Components ....................................................................................................... 42-43
Engine and Attaching Parts ...................................................................................................... 44-45
Steering Components ................................................................................................................ 46-47
rake Components ................................................................................................................... 48-49
Fuel and Hydraulic System ....................................................................................................... 50-51
Electrical System ...................................................................................................................... 52-53
Hydraulic Pump Assembly ....................................................................................................... 54-55
Replacement Decals ................................................................................................................. 56-57
Electrical Schematic (Kawasaki & Kohler) ................................................................................... 58

1
GENERAL INFORMATION
1.1 INTRODUCTION
Your mower was built to the highest standards in the
industry. However, the prolonged life and maximum
efficiency of your mower depends on you following the
operating, maintenance and adjustment instructions in this
manual.
If additional information or service is needed, contact your
Scag Power quipment 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.
USE OF OTHER THAN ORIGINAL SCAG
REPLACEMENT PARTS WILL VOID THE
WARRANTY.
When ordering parts, always give the model and serial
number of your tractor. The serial number plate is located
where shown in Figure 1-1.
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 i ba ed upon product information
available at the time of approval for printing. Scag
Power Equipment re erve the right to make change
at any time without notice and without incurring any
obligation.
1.2 DIRECTION REFERENCE
The Right and Left, Front and Rear of the machine
are referenced from the operators right and left when
seated in the normal operating position and facing the
forward travel direction.
1.3 SERVICING THE ENGINE AND DRIVE
TRAIN COMPONENTS
The detail servicing and repair of the engine, hydraulic pumps
and gearboxes are not covered in this manual; only routine
maintenance and general service instructions are provided.
For service of these components during the limited warranty
period, it is important to contact your Scag dealer or find a
local authorized servicing agent of the component
manufacturer. Any unauthorized work done on these
components during the warranty period may void your
warranty.
Section 1
Figure 1-1 Tractor Serial Number Plate Location
Model
Serial
SCAG
Power Equipment
STC 2K SPL
SERIAL NUMBER
PLATE LOCATION

2
SAFETY INFORMATION
2.1 INTRODUCTION
Your mower is only as safe as the operator. Carelessness
or operator error may result in serious bodily injury or death.
Hazard control and accident prevention are dependent upon
the awareness, concern, prudence, and proper training of
the personnel involved in the operation, transport,
maintenance and storage of the equipment. Make sure
every operator is properly trained and thoroughly familiar
with all of the controls before operating the mower.
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
quipment, Service Department at P.O. Box 152, Mayville,
WI 53050. Please indicate the complete model and serial
number of your Scag product when requesting replacement
manuals.
2.2 SIGNAL WORDS
This symbol means Attention! Become Alert! Your
Safety i Involved!" The symbol is used with the
following signal words to attract your attention to safety
messages found on the mower decals and throughout this
manual. The message that follows the symbol contains
important information about safety. To avoid injury and
possible death, carefully read the message! Be sure to
fully understand the causes of possible injury or death.
Signal Word:
It is a distinctive word found on the mower safety decals
and throughout this manual that alerts the viewer to the
existence and relative degree of the hazard.
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.
The signal word DANG R 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.
CAUTION:
The signal word CAUTION is a reminder of safety
practices on or near the machine that could result in personal
injury if proper precautions are not taken.
Your safety and the safety of others depends significantly
upon your knowledge and understanding of all correct
operating practices and procedures of this machine.
2.3 BEFORE OPERATION
CONSIDERATIONS
1. NEVER allow children to operate this riding mower.
Do not allow adults to operate this machine without
proper instructions.
2. DO NOT mow when children and/or others are
present.
3. Clear the area to be mowed of objects that could be
picked up and thrown by the cutter blades.
4. DO NOT carry passengers.
WARNING:
Section 2

3
11. Keep flammable objects (cigarettes, matches, etc.),
open flames and sparks away from the fuel tank and
fuel container.
12. quipment must comply with the latest requirements
per SA J137 and/or ANSI/ASA 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 A SI / ASAE S279 requirements. Contact
your local authorities for regulations and
equipment requirements.
13. DO NOT operate without the side discharge chute
installed and in the down position.
14. Check the blade mounting bolts at frequent intervals
for proper tightness.
15. Make sure all hydraulic fluid connections are tight and
all hydraulic hoses and lines are in good condition before
starting the machine.
2.4 OPERATION CONSIDERATIONS
1. Know the function of all controls and how to stop
quickly.
2. Reduce speed and exercise extreme caution on slopes
and in sharp turns to prevent tipping or loss of control.
Be especially cautious when changing directions on
slopes.
DONOT operateon steepslopes. Tocheck aslope,
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. ALWAYS FOLLOW OSHA APPROVED
OPERATION.
2.3 BEFORE OPERATION
CONSIDERATIONS (CONT'D)
5. DO NOT wear loose fitting clothing that could get
tangled in moving parts. Do not operate the machine
wearing shorts; always wear adequate protective
clothing including long pants. Wearing safety glasses,
safety shoes and a helmet is advisable and is required
by some local ordinances and insurance regulations.
6. Operator hearing protection is recommended,
particularly for continuous operation of the mower.
Wear suitable hearing protection. Prolonged exposure
to loud noise can cause hearing impairment or loss.
7. Keep the machine and attachments in good operating
condition. Keep all shields and safety devices in place.
If a shield, safety device or decal is defective or
damaged, repair or replace it before operating the
machine.
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
driveengaged and/orthe steeringcontrollevers not
in the neutral position and the parking brake not
engaged. Neveroperateequipmentwiththeinterlock
system disconnected or malfunctioning.
8. Be sure the interlock switches are functioning correctly.
9. Fuel is flammable; handle it with care. Fill the fuel
tank outdoors. Never fill it indoors. Use a funnel or
spout to prevent spillage. Clean up any spillage before
starting the engine.
10. DO NOT add fuel to a running or hot engine. Allow
the engine to cool for several minutes before adding
fuel.
Section 2
WARNING:
WARNING:

4
Section 2
2.4 OPERATION CONSIDERATIONS
(CONT'D)
3. To prevent tipping or loss of control, start and stop
smoothly, avoid unnecessary turns and travel at reduced
speed.
4. When using any attachment, never direct the discharge
of material toward bystanders or allow anyone near
the machine while in operation.
5. Before attempting to start the engine, with the operator
in the seat, disengage power to the cutter deck, place
the steering control levers in the neutral position and
engage the parking brake.
6. If the mower discharge ever plugs, shut off the engine,
remove the ignition key, and wait for all movement to
stop before removing the obstruction. Do not u e your
hand to di lodge the clogged di charge chute. Use
a stick or other device to remove clogged material.
7. Be alert for holes, rocks, roots and other hidden hazards
in the terrain. Keep away from any dropoff. Beware
of overhead obstructions (low limbs, etc.), underground
obstacles (sprinklers, pipes, tree roots, etc.). Cautiously
enter a new area. Be alert for hidden hazards.
8. Disengage power to cutter deck before backing up.
Do not mow in reverse unless absolutely necessary
and then only after observation of the entire area behind
the mower.
9. DO NOT turn sharply. Use care when backing up.
10. Disengage power to cutter deck before crossing roads,
walks or gravel drives.
11. Mow only in daylight or good artificial light.
12. Take all possible precautions when leaving the machine
unattended, such as disengaging the mower, lowering
the attachments, setting the parking brake, stopping the
engine, and removing the key.
13. Disengage power to the attachments when transporting
or when not in use.
14. The machine and attachments should be stopped and
inspected for damage after striking a foreign object,
and damage should be repaired before restarting and
operating the machine.
15. 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.
16. DO NOT run the engine inside a building or a confined
area without proper ventilation. xhaust fumes are
hazardous and could cause death.
2.5 MAINTENANCE CONSIDERATIONS
1. Never make adjustments to the machine with the
engine running unless specifically instructed to do so.
If the engine is running, keep hands, feet, and clothing
away from moving parts.
2. Remove the key from the ignition switch to prevent
accidental starting of the engine when servicing or
adjusting the machine.
3. Keep all nuts, bolts and screws tight, to ensure the
machine is in safe working condition. Check blade
mounting bolts frequently to be sure they are tight.
4. Do not change the engine governor settings or
overspeed the engine. See the engine operator's manual
for information on engine settings.
5. To reduce fire hazard, keep the engine free of grass,
leaves, excessive grease, oil and dirt.
6. Hydraulic fluid i under high pre ure. Keep body
and hands away from pinholes or nozzles that eject
hydraulic fluid under high pressure. If you need service
on your hydraulic system, please see your authorized
Scag dealer.
7. Hydraulic fluid under high pressure may have sufficient
force to penetrate skin and cause serious 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.

5
Section 2
2.6 SAFETY AND INSTRUCTIONAL DECALS
DANGER
SPINNING BLADE
KEEP CLEAR
CONTACT CAN INJURE
48071
ROTATING BLADES AND BELTS
WARNING
KEEP HANDS, FEET & CLOTHING CLEAR
KEEP ALL GUARDS IN PLACE
SHUT OFF ENGINE & DISENGAGE BLADE
CLUTCH BEFORE SERVICING
CLEAR AREA OF DEBRIS BEFORE MOWING
USE CAUTION IN DIRECTING DISCHARGE
KEEP BYSTANDERS, CHILDREN & PETS AWAY
READ INSTRUCTION MANUAL BEFORE OPERATING
DO NOT OPERATE WITHOUT DISCHARGE CHUTE, MULCHING
KIT, OR ENTIRE GRASS CATCHER INSTALLED
481040
CAUTION
KEEP BYSTANDERS AWAY
CAUTION
BEFORE OPERATING
READ OPERATINGS
MANUAL AND SAFETY
INSTRUCTIONS
481567
START / DRIVE
PROCEDURE
ENGAGE PARKING BRAKE
DISENGAGE MOWER DECK DRIVE
MOVE CONTROL HANDLES
TO NEUTRAL LOCK POSITION
START ENGINE
RELEASE PARKING BRAKE
SELECT FORWARD OR
REVERSE SPEED WITH
HYDRO CONTROL HANDLES
WARNING
INSTALL BELT COVER BEFORE
OPERATING MACHINE
READ OPERATOR'S MANUAL
481039
481568
FORWARD
REVERSE
FR
CAUTION
AVOID INJURY FROM
BURNS. SHUT OFF
ENGINE BEFORE
REMOVING FUEL
TANK CAP.
481272

6
Section 3
SPECIFICATIONS
3.1 ENGINE
General Type .............................................................................. Heavy Duty Industrial/Commercial Gasoline
Brand ......................................................................................... Kawasaki, Kohler
Horsepower ................................................................................ 7 HP (Spec.#FH500V) (Scag Model STC40- 7KA)
9 HP (Spec.#FH60 V) (Scag Model STC48- 9KA, STC48A- 9KA)
20 HP (Spec.#CV20S) (Scag Model STC48-20CV, STC48A-20CV)
2 HP (Spec.#FH64 V) (Scag Model STC48-2 KA, STC48A-2 KA,
STC52A-2 KA)
23 HP (Spec.#FH680V) (Scag Model STC52A-23KA)
Type ........................................................................................... 4 Cycle Gasoline, Twin Cylinder, Horizontal Shaft
Cylinders .................................................................................... 2 with Cast Iron Sleeves
Governor .................................................................................... Mechanical Type with Variable Speed Control Set At 3600 RPM
Idle Speed .................................................................................. 550 RPM - Kawasaki
900 RPM - Kohler
Kawasaki Fuel Pump Group ....................................................... Mechanical Fuel Pump with In-Line Fuel Filter, Fixed Jet Downdraft
Carburetor.
Fuel ............................................................................................ Non-Leaded Gasoline with a Minimum Octane Rating of 87
Oil Pump Group .......................................................................... Positive Displacement Gerotor Oil Pump
Starter ......................................................................................... Electric Starting with Solenoid Shift Starter
Belts: .......................................................................................... Kevlar cord. Self-adjusting, Self-tightening
Pump Drive Belt ...................................................................... Scag Part Number - 482009
3.2 ELECTRICAL
Battery ....................................................................................... 2 Volt
Charging System ........................................................................ Alternator
Charging Output ........................................................................ 2 Volt, 3 Amp - Kawasaki
2 Volt, 5 Amp - Kohler
System Polarity .......................................................................... Negative Ground
Starter ......................................................................................... 2 Volt Electric Ring Gear Type, Key and Solenoid Operated
Interlock Switches ...................................................................... Seat, Neutral Control, Mower Engagement (BBC), Parking Brake
Instrument Panel ........................................................................ Hourmeter, Key Switch, Throttle Lever, Manual Choke,
PTO Switch, Fuses and Safety Start module
Fuses ......................................................................................... Two (2) 20 Amp
3.3TRACTOR
Drive System .............................................................................. Hydraulic Drive with Two Variable Displacement Pumps and Two
Cast-iron High Torque Motors
Hydrostatic Pumps .................................................................... Two Hydro-Gear BDP 0L Pumps with Dump Valves for
movement without running the engine
Drive Wheel Motors .................................................................. Two Ross 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 ...................................................................... 3 X 5-6 Four-Ply w/tapered roller bearing pivots
(2) Drive - (40" Deck) ............................................................. 23 X 8.5 X 2 Four-Ply Pneumatic Tubeless, Radius Edge
(2) Drive - (48"-52" Deck) ...................................................... 24 X 2 X 2 Four-Ply Pneumatic Tubeless, Radius Edge
Fuel Tanks .................................................................................. 2 @ 4.5-Gallon Seamless Polyethylene Tank with large opening and
Fuel Gauge Fill Cap
Tire Pressure:
Front Caster ........................................................................... 25 PSI
Drive ...................................................................................... 8 PSI
Seat ............................................................................................ Padded, Thick Cushion with Extra Spring Support

7
Section 3
3.3 TRACTOR (CONT'D)
Travel Speed:
Forward ................................................................................. 0- 0 MPH
Reverse .................................................................................. 0-5 MPH
3.4 CUTTER DECK
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 /2" of steel.,7-gauge (3/ 6") deck skirt.
True Cutting Width: ................................................................... 39" ( 0 .0 cm), 48" ( 22.0 cm), 52" ( 32.0 cm)
Cutting Height Adjustment: ....................................................... Foot Operated Lever Adjustment from Operator's Seat, .00" to
5.5" in /2"increments
Cutter Blades: ............................................................................. . 97 Thick, Milled Edge, Wear Resistant Marbain
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
Spindles: .................................................................................... Heavy-duty - /8" Top Dimension Spindle Shaft, Cast Housing,
Taper Roller Bearing, Low Maintenance with Top Access Grease
Fitting and Grease Overfill Relief Poppet
Spindle Pulleys: .......................................................................... Cast-iron with Easily Removed Taper Hubs
Cutter Deck Belts: ...................................................................... B-section with Kevlar Cord. Self-adjusting, Self-tightening
SMTC40 ................................................................................ Scag Part Numbers - 482090, 48209
SMTC48 ................................................................................ Scag Part Numbers - 482 37, 482 38
SMTC52 ................................................................................ Scag Part Numbers - 482 39, 482 40
Electric Clutch Type ................................................................... Ogura Heavy Duty PTO Clutch Brake
3.6 HYDRAULIC SYSTEM
Hydraulic Oil Filter ..................................................................... 0 Micron Spin-on Element Type
Hydraulic Reservoir ................................................................... Nylon; 5 Quart Capacity
3.7 PRODUCTIVITY
The following 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 4 MPH with an allowance for overlap and turns.
Cutting Width: 40" 48" 52"
Acres Per Day: 72 23
-NOTE-
The machine will travel at 10 mph for
transport purposes. For best cutting
performance the forward travel speed
should be adjusted depending upon the
cutting conditions.

8
Section 4
OPERATING INSTRUCTIONS
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.
4.1 CONTROLS AND INSTRUMENT
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.
CAUTION:
1. Ignition Switch (Figure 4-1). Used to start the
engine and has three positions; OFF, ON, and
S AR .
2. Mower Deck Switch (Figure 4-1). 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.
3. Engine Choke Control (Figure 4-1). Used to
start a cold engine.
4. Engine Throttle Control (Figure 4-1). Used to
control the engine speed. Pushing the lever forward
decreases engine speed. Pulling the lever back
increases engine speed. Full forward position is the
IDLE position. Full forward is the cutting position.
Figure 4-1 Controls and Instruments
LEFT STEERING
CONTROL
MOWER
DECK
SWITCH
IGNITION
SWITCH
HOURMETER FUEL
GAUGE
FUSES
RIGHT STEERING
CONTROL
DECK LIFT
390S0142A
PARKING BRAKE
CONTROL CUTTING HEIGHT
ADJUSTMENT
OFF
OFF
481640
ON
START
OFF PULL OUT TO ENGAGE
PUSH INTO DISENGAGE
MOWER DECK
FUEL
GAUGE
ENGINE
CHOKE
CONTROL
ENGINE
THROTTLE
CONTROL
FUEL SWITCHINGVALVE
KA MODEL - LEFT SIDE
KH MODEL - RIGHT SIDE
DUMP
VALVE
ROTATE
DECK
RELEASE

9
Section 4
5. ourmeter (Figure 4-1). Indicates the number of
hours the engine has been operated. It operates
whenever the ignition key switch is in the ON
position. It can be used to keep track of
maintenance intervals and the amount of time
required to perform various tasks.
6. Fuse olders (Figure 4-1). wo 20-amp fuses
protect the mowers electrical system. o replace
fuses, pull fuse out of the socket and install a new
fuse.
7. Left Steering Control (Figure 4-1). Used to
control the mower's left wheel when traveling
forward or reverse.
8. Right Steering Control (Figure 4-1). Used to
control the mower's right wheel when traveling
forward or reverse.
9. Parking Brake Control (Figure 4-1). 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.
10. Fuel Tank Gauges (Figure 4-1). Indicates the
amount of fuel in each fuel tank.
11. Fuel Switching Valve (Figure 4-1). Located on
the left side for KA models and right side for the KH
models. Used to shut off fuel supply to the engine
and change fuel supply between the fuel tanks.
Rotate the valve counter clockwise to supply fuel
from the tank on the left side only. Rotate the valve
clockwise to supply fuel from the tank on the right
side only.
12. Dump Valve Control Levers (Figure 4-2).
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. he levers must be in this position
during operation of the mower. Rotating the levers
counter-clockwise, 1-2 turns, allows the mower to
be moved by hand (free-wheeling).
13. Deck Lift Foot Lever (Figure 4-1). Used to raise
and lower the cutter deck.
Figure 4-2 Dump Valve Control
14. Cutting eight Adjustment (Figure 4-1). Used to
set the cutter deck at the desired cutting height.
15. Deck Release Lever (Figure 4-1). 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.
4.2 SAFETY INTERLOCK SYSTEM
he 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. he 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.
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.
4.3 INITIAL RUN-IN PROCEDURES (First
Day of Use or Approximately 10 Hours)
1. Check all belts for proper alignment and wear at 2, 4
and 8 hours.
WARNING:
STC99DVC
DUMPVALVE
CONTROL LEVERS

10
Section 4
2. Change the engine oil and oil filter after the first 5
hours of operation. (See Section 7.4.)
3. Check hydraulic oil level in reservoir. (See Section
7.3.)
4. Check for loose hardware. ighten as needed.
5. Check interlock system for proper operation. (See
Section 4.2.)
6. Check tire pressure. Adjust pressure if necessary.
(See Section 7.10)
4.4 STARTING THE ENGINE
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.
1. Be sure the fuel shutoff valve, located behind the
operator's seat by the right fuel tank for the KH
model, left fuel tank for the KA model , is completely
open. (See section 7.5.)
2. Sit in the operators seat and place the steering
control levers in the neutral position.
3. Engage the parking brake.
4. If the engine is cold, choke the engine as needed.
5. Move the engine throttle control to about half
engine speed.
CAUTION:
6. urn the ignition key to the S AR position and
release the key as soon as the engine starts. Do not
hold the key in the S AR 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.
7. Allow engine to warm before operating the mower.
4.5 GROUND TRAVEL AND STEERING
-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.
Forward Travel
o 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. he further the steering control levers
are pushed forward the greater the forward speed will
be. o increase the speed, push the steering control
levers further forward and to decrease the speed, pull the
steering control levers back.
o stop the forward travel, pull the steering control levers
back to the neutral position.

11
Section 4
o steer the mower left while traveling forward, pull the
left steering lever back. he further the lever is pulled
back, the quicker the mower will turn left.
o steer the mower right while traveling forward, pull the
right steering control lever back. he 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.
-IMPORTANT-
o not travel forward over a curb. The
mower may hang up on the curb. Raise the
deck and travel backwards over the curb at a
45 degree angle. (see section 4.1, item 13 for
cutter deck raising instructions)
Reverse Travel
Disengage power to the mower before backing up.
Donot mowinreverse unlessabsolutelynecessary
and then only after observation of the entire area
behind the mower.
Before backing up, observe the rear for persons
and obstructions. Clear the area before backing
up.Possible injuryor propertydamagecould occur.
o 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 must be made using the
steering controls.
o steer left while traveling in reverse, allow the left
steering control lever to move forward. he futher the
control is allowed to move forward, the quicker the
mower will turn left.
o steer right while traveling in reverse, allow the right
steering control lever to move forward. he further the
control is allowed to move forward, the quicker the
mower will turn right.
o 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.
4.6 ENGAGING THE DECK DRIVE (CUTTER
BLADES)
1. Set the throttle at about 3/4 speed. Do not attempt to
engage the deck drive at high speed as this shortens
the electric clutch life  use only moderate engine
speed when engaging the deck drive.
2. Engage the deck drive by pulling out on the yellow
switch, located on the instrument panel, (Figure 4-3)
to the engage position.
-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. This is
normal.
CAUTION:
CAUTION:
Figure 4-3 Cutter Engage Switch
STT99CES
PULL UP TO ENGAGE
PUSH DOWN TO DISENGAGE

12
Section 4
5. urn the ignition key to the OFF position and remove
the key.
4.9 AFTER OPERATION
1. Wash the entire mower after each use. Do not use
high pressure spray or direct the spray onto
electrical components.
-IMPORTANT-
o not wash a hot or running engine. Cold
water will damage the engine. Use compressed
air to clean the engine if it is hot.
2. Keep the entire mower clean to inhibit serious heat
damage to the engine or hydraulic oil circuit.
3. Check the drive belts for proper alignment and any
signs of wear. Correct and adjust if necessary.
To avoid injury from burns, allow the mower to cool
before removing the fuel tank cap and refueling.
4. After the mower has cooled down, fill the fuel tanks
with fresh, clean fuel at the end of every day of
operation.
5. Check the tire pressure. Adjust pressure if necessary.
3. o disengage the deck drive, push the switch in to
the disengage position.
4. Always operate the engine at full throttle to properly
maintain cutting speed. If the engine starts to lug
down, reduce the forward speed and allow the
engine to operate at maximum RPM.
4.7 HILLSIDE OPERATION
DONOT operateon steepslopes. To check aslope,
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. ALWAYS FOLLOW OSHA APPROVED
OPERATION.
1. his 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. Wet grass
reduces traction and steering control.
2. o prevent tipping or loss of control, do not start or
stop suddenly, avoid unnecessary turns and travel at
reduced speed.
3. Keep tires properly inflated.
4.8 PARKING THE MOWER
1. Place the steering control levers in the neutral
position.
2. Disengage the cutter blades
3. Slow the engine to idle speed.
4. Engage the parking brake.
WARNING:

13
Section 4
4.10 REMOVING CLOGGED MATERIAL
ROTATING BLADES
NEVERPUT YOUR HANDSINTO THE DISCHARGE
CHUTE FOR ANY REASON! Shut off the engine and
remove the key and only then use a stick or similar
object to remove material if clogging has occurred.
1. If the discharge chute becomes clogged, shut off the
engine and remove the ignition key. Using a stick or
similar item, dislodge the clogged material. hen
resume normal mowing.
4.11 MOVING MOWER WITH ENGINE
STOPPED
o free-wheel or move the mower around without the
engine running, place the dump valve levers in the
FREE-WHEEL position (Figure 4-2, Page 9). Disengage
the parking brake and move the mower by hand. he
dump valve levers must be returned to the DRIVE
position to drive the mower.
4.12 RECOMMENDATIONS FOR MOWING
1. Do not mow with dull blades. A dull blade will tear
grass, resulting in poor lawn appearance and less
engine power.
2. he discharge chute must not be removed and must
be kept in the lowest position to deflect grass
clippings and thrown objects downward. Direct the
side discharge away from sidewalks or streets to
minimize cleanup of clippings. When mowing close
to obstacles, direct the discharge away from the
obstacles to reduce the chance of property damage
by thrown objects.
3. Cut grass when it is dry and not too tall. Do not cut
grass too short (cut off 1/3 or less of existing grass
for best appearance). Mow frequently.
4. Keep mower and discharge chute clean.
5. When mowing wet or tall grass, mow the grass
twice. Raise the mower to the highest setting for the
first pass and then make a second pass to the desired
height.
6. Use a slow travel speed for trimming purposes.
7. Operate the engine at full throttle for best cutting.
Mowing with a lower RPM causes the mower to tear
the grass. he engine is designed to be operated at
full speed.
8. Use the alternate stripe pattern for best lawn
appearance. Vary the direction of the stripe each
time the grass is mowed to avoid wear patterns in
the grass.

14
Section 4
4.13 ADJUSTING CUTTING HEIGHT
he mower deck can be adjusted from a height of 1-inch
to 5-1/2 inches at 1/2-inch intervals. o adjust the cutting
height:
Do not adjust the cutting height with the mower
blades rotating. Disengage the power to the cutter
blades and then adjust cutting height.
1. Disengage the power to the cutter blades.
2. Push the cutting height adjustment foot pedal all the
way forward using your right foot until it locks in
place. (Figure 4-5).
3. Insert the lanyard pin into the cutting height index at
the desired cutting height. Push forward on the deck
lift foot lever, hold in place and lift up on the deck
release lever, (Figure 4-4). Slowly release the foot
pedal. A deck height decal is located on the cutting
height index as an aid in adjusting the deck to the
desired height. (Figure 4-5).
Figure 4-4 Deck Release Lever
WARNING:
Figure 4-5 Adjusting Cutting eight
FORWARD
REVERSE
F
R
DECK
RELEASE
LEVER
STC99DRL
LANYARD PIN
HEIGHT ADJUSTMENT PEDAL
CUTTING
HEIGHT
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
481543
STC99ACH

Section 5
15
Stringers - Occasional Low engine RPM Run engine at full RPM
Blades of Uncut
Grass Ground speed too fast Slow speed to adjust for conditions
Wet grass Cut grass after it has dried out
Dull blades, incorrect sharpening Sharpen blades
Deck plugged, grass accu ulation Clean underside of deck
Belts slipping Adjust belt tension
Streaking - Strips of Dull, worn blades Sharpen blades
Uncut Grass in Cutting
Path Incorrect blade sharpening Sharpen blades
Low engine RPM Run engine at full RPM
Belt slipping Adjust belt tension
Deck plugged, grass accu ulation Clean underside of deck
Ground speed too fast Slow speed to adjust for conditions
Wet grass Cut grass after it has dried out
Bent blades Replace blades
Width of Deck
SGB018
CONDITION CAUSE CURE
Width of Deck
SGB020
Width
of
Deck
Width
of
Deck
SGB019
Streaking - Strips of Not enough overlapping Increase the overlap of each
Uncut Grass Between between rows pass
Cutting Paths
TROUBLESHOOTING CUTTING CONDITIONS

Section 5
16
Uneven Cut on Flat Lift worn fro blade Replace blade
Ground - Wavy
High-Low Blade upside down Mount with cutting edge toward
Appearance, ground
Scalloped Cut, or
Rough Contour Deck plugged, grass accu ulation Clean underside of deck
Too uch blade angle (deck pitch) Adjust pitch and level
Deck ounted i properly See your authorized SCAG dealer
Bent spindle area See your authorized SCAG dealer
Dull blade Sharpen blade
TROUBLESHOOTING (CONT'D)
Sloping Ridge Across Tire pressures not equal Check and adjust tire pressure
Width of Cutting Path
Wheels uneven Check and adjust tire pressure
Deck ounted incorrectly See your authorized SCAG dealer
Deck not level side-to side Check for level and correct
CONDITION CAUSE CURE
Uneven Cut on Uneven ground May need to reduce ground speed,
Uneven Ground - raise cutting height, and/or change
Wavy Appearance, direction of cut
High-Low Scalloped
Cut, or Rough Contour
Width of Deck
SGB020
Width of Deck
SGB021
Width of Deck
SGB023