Scag Power Equipment STT-31BSG User manual

MODEL STT-31BSGMODEL STT-31BSG
MODEL STT-31BSGMODEL STT-31BSG
MODEL STT-31BSG
OPERATOR’S MANUALOPERATOR’S MANUAL OPERATOR’S MANUALOPERATOR’S MANUAL
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. THESPECIFICMODELS THATTHIS
BOOK COVERS ARE CONTAINED ON THE
INSIDECOVER. BEFORE OPERATINGYOUR
MACHINE, PLEASE READ ALL THE INFOR-
MATION ENCLOSED.
PART NUMBER

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
Symbols ............................................................................................................................... 2-3
2.1 Introduction .............................................................................................................................4
2.2 SignalWords ...........................................................................................................................4
2.3 Before Operation Considerations ...........................................................................................4
2.4 OperationConsiderations........................................................................................................5
2.5 Maintenance Considerations ...................................................................................................6
2.6 Safety and Instructional Decals ..............................................................................................7
Section 3 - Specifications .......................................................................................................8-9
Section 4 - Operating Instructions
4.1 Controls and Instrument Identification ..................................................................................10
4.2 Safety Interlock System........................................................................................................ 11
4.3 Initial Run-In Procedures......................................................................................................12
4.4 Starting the Engine................................................................................................................12
4.5 Ground Travel and Steering ..................................................................................................12
4.6 Engaging the Deck Drive .....................................................................................................13
4.7 HillsideOperation .................................................................................................................14
4-8 Parking the Mower ...............................................................................................................14
4.9 After Operation ....................................................................................................................14
4.10 Removing Clogged Material .................................................................................................15
4.11 Moving Mower with Engine Stopped ...................................................................................15
4.12 Recommendations for Mowing.............................................................................................15
4.13 Adjusting CuttingHeight .......................................................................................................16
Section 5 -Troubleshooting Cutting Conditions............................................................. . 17-19

II
TABLE OF CONTENTS (CONT'D)
SUBJECT PAGE
Section 6 - Adjustments
6.1 Parking Brake Adjustment....................................................................................................20
6.2 TravelAdjustments ...............................................................................................................20
6.3 Throttle Control and Choke Adjustments..............................................................................22
6.4 BeltAdjustment ....................................................................................................................22
6.5 BeltAlignment ......................................................................................................................22
6.6 Cutter Deck Adjustments .....................................................................................................23
Section 7 - Maintenance
7.1 Maintenance Chart ...............................................................................................................25
7.2 LubricationFittingPoints ......................................................................................................26
7.3 Hydraulic System..................................................................................................................28
7.4 EngineOil .............................................................................................................................29
7.5 Engine Fuel System ..............................................................................................................30
7.6 Engine Air Cleaner................................................................................................................30
7.7 Battery ..................................................................................................................................30
7.8 Drive Belts ............................................................................................................................32
7.9 Cutter Blades ........................................................................................................................32
7.10 Tires ......................................................................................................................................33
7.11 Cutter Deck Gearbox ...........................................................................................................34
7.12 CoolingSystem .....................................................................................................................34
7.13 Body, Deck, Hopper and Upholstery ....................................................................................35
Section 8 - Illustrated Parts List
SMST 61"Adv., 72" Adv. Cutter Decks ................................................................................... 36-37
Cutter Deck Controls................................................................................................................ 38-39
Sheet Metal Components.......................................................................................................... 40-41
Deck Drive Components .......................................................................................................... 42-43
Radiator, Coolers & Engine Brackets.................................................................................44-45
Brake & Steering Components..........................................................................................46-47
Fuel & Hydraulic System ......................................................................................................... 48-49
Electrical System ...................................................................................................................... 50-51
Hydraulic Pump Assembly - BDP-21L .................................................................................... 52-53
Wire Harness, STT-31BSG ............................................................................................................54
Replacement Decals................................................................................................................. 55-56

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 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.
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 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.
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 1-1Tractor Serial Number Plate Location
390S0137A
SERIAL NUMBER
PLATE LOCATION
R
MODEL
SERIAL
Division of Metalcraft of Mayville, Inc.
Mayville, Wisconsin 53050
Patents Issued and Pending
MANUFACTURED UNDER ONE OR MORE
OF THE FOLLOWING PATENTS:
PATENTS PENDING
4,487,006
4,885,903
4,920,733
4,967,543
4,991,382
4,998,948
5,118,617
5,826,416
5,832,708
5,865,018

4
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
Equipment, 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 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.
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 “DANGER” denotes that an extremely
hazardous situation exists on or near the machine that
could result in high probability of death or irrepairable
injury if proper precautions are not taken.
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
properinstructions.
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.
5. DO NOT operate the machine under the influence
of alcohol or drugs.
6. If the operator(s) or mechanic(s) cannot read English
it is the owner's responsibility to explain this material
to them.
WARNING:
Section 2

8
SPECIFICATIONS
SCAG "SABRE TOOTH TIGER" ZERO-TURN RIDER
MODEL: STT-31BSG
ENGINE
General Type: Heavy duty industrial commercial
Brand: Briggs Daihatsu Vanguard Liquid Cooled 31 HP
Model: DM950G
Horsepower: 31HP@3600RPM
Type: Water cooled 4 cycle, overhead valve, 3 cylinder, gas engine
Displacement: 952cc
Cylinders: 3 inline sleeves
Governor: High-speed flyweight governor, runs faster than engine crankshaft, provides precision speed
governing and a steady low idle, 3600 rpm (±100 rpm), idle set at 1500 rpm.
Air Intake Group: Canister type air filter system.
Exhaust Group: Single exhaust canister muffler.
FuelPump Group: Electric fuel pump with mechanical choke and fuel shutdown solenoid.
OilPumpGroup: Positive displacement Geroter™ oil pump with remote oil filter, capacity 3.2 U.S. quarts
(3.0ltrs) withoilfilter.
ValveGroup: Overhead.
Electrical/ChargingSystem: 12 volt battery with alternator, solid state ignition with key start, 40 amp regulated charging
system using a microprocessor and one ignition coil for each cylinder, solenoid shift type
starter.
ENGINEDECK
FuelTank: 10 gallon (38.0 liters) seamless polyethylene tank with fuel gauge gas cap.
Drive Wheels/Tires: 24 x 12-12 four ply pneumatic tubeless, radius edge, offset rims to improve operator's view.
ParkingBrake: Lever operated interlocked parking brake prevents operation with parking brake engaged.
Frame: Compact tractor frame with structural steel tubing construction.
DRIVESYSTEM
Type: Hydro drive with two variable displacement pumps and two cast iron motors for independent control
of each drive wheel.
Hydro Pumps: Two Hydro-Gear Model BDP 21L pumps with dump valves for movement without running engine.
Drive Wheel Motors: Two 23 cubic inch cast iron high torque wheel motors.
TransmissionBelt Idler: Self adjusting, self tightening, sealed bearings.
Hydro Fluid Cooling Group: 6 qt. capacity Nylon fluid reservoir. Uses SAE 20W50 fluid and 10 micron filter.
Steering/Travel Control: Twin lever fingertip steering control with gas shock dampeners for smooth, responsive control to
each wheel.
Axles: 1-1/4" heavy duty, tapered, motor shafts.
Wire Harness: 14 gauge wire.
Safety Group: Seat actuated engine kill, neutral interlock, mower engagement (BBC) switch, parking brake.
Instrument Panel: Voltmeter, water temperaturegauge, oil pressuregauge, key switch,throttle, fuses, manual choke,BBC
switch (hourmeter located at rear of machine).
Forward Ground Speed Range: 0to 10.5 mph.
Reverse Ground Speed Range: 0 to 5.0mph.
Note: The machine will travel at 10.5 mph for transport purposes. For best cutting performance the
forward travel speed should be adjusted depending upon the cutting conditions.
Section 3

9
SPECIFICATIONS (con't)
SCAG "SABRE TOOTH TIGER" ZERO-TURN RIDER
MODEL: STT-31BSG
CUTTERDECK
Type: SMST-72A ("Advantage") & SMST-61A ("Advantage"): Floating, adjustable anti-scalping, hybrid
design combines out-front and belly-mount designs. "Advantage" - special extended front edge
allows Bahia or other tough grasses to enter the deck standing upright.
Construction: 10 gauge steel top reinforced with 7 gauge support plate, deck skirt is 7 gauge steel.
True Cutting Width: 72"deck= 71.5inches (181.6cm);61" deck= 61.0"(155.0cm).
Cutting Height Adjustment: Foot operated pedal adjustment from operator's seat, 1" to 6" in 1/2" increments.
Cutter Blades: 72" = three (3) 24" blades; 61" = three (3) 21" blades.
CutterDeck Drive: Drive shaft to 90 degee gear box.
BladeEngagement: Electric blade engagement clutch with control panel knob.
Discharge Opening: Extra wide 11.5" discharge opening with spring loaded discharge chute.
Caster Wheels: 13 x 5 x 6 caster wheels with tapered roller bearing pivots.
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: Cast iron with easily removed taper hubs.
Anti-scalp Rollers: Two front, two rear 4-1/2" adjustable, two rear 12" fixed.
ADDITIONALSPECIFICATIONS
Seat: Thick padded seat cushions with special springs. Padded arm rests, lever adjustment forward and
back.
APPROXIMATEDIMENSIONS
72" 61"
Length: 92.0" 88.0"
Tracking Width: 56.0" 56.0"
Width: 83.5" 72.0"
Width (with discharge chute up) 73.0" 61.5"
Height: 47.0" 47.0"
Turning Radius: Zero radius turn Zero radius turn
Weight: 1550 lbs. 1550 lbs.
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: 36" 48" 52" 61" 72"
Acres Per Day: 9.5 12.5 13.5 16 19
Dateof issue: November, 2000
Specifications Subject to Change Without Notice.
Section 3

10
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). The ignition switch
is used to start the engine and has three positions;
OFF, ON, and START.
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
increases engine speed. Pulling the lever back
decreases engine speed. Full back position is the
IDLE position. Full forward is the cutting position.
Figure 4-1 Controls and Hour Meter Instruments
CHOKE
481348
F
LEFT STEERING
CONTROL
MOWER DECK
IGNITION SWITCH
FUEL GAUGE
DUMPVALVEDUMPVALVE
FUSES
ENGINE
CHOKE
CONTROL
ENGINETHROTTLE
CONTROL
RIGHT STEERING
CONTROL
DECK LIFT
DECK RELEASE
390S0142A-1
PARKING BRAKE
CONTROL
CUTTING HEIGHT
ADJUSTMENT
PULL OUT TO ENGAGE
ON
START
PUSH INTO DISENGAGE
OFF
481669
MOWER DECK
AMMETER
MOWER DECK SWITCH
IGNITION SWITCH
TEMPERATURE GAUGE
KAWASAKI MACHINE ONLY
AMMETER
SWITCH
WATERTEMPERATURE

11
Section 4
5. Voltmeter (Figure 4-1). 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.
6. Oil Pressure (Figure 4-1). Indicates engine oil
pressure. Reference the engine operator's manual
for further information.
7. Hourmeter (Figure 4-1). Indicates the number of
hours the engine has been operted. It operates
whenever the engine is running. It can be used to
keep track of maintenance intervals and the amount
of time required to perform various tasks.
7. Fuse Holders (Figure 4-1). There are two 20-amp
fuses and one 40-amp fuse that protect the mower’s
electrical system. To replace fuses, pull fuse out of
the socket and install a new fuse.
8. Left Steering Control (Figure 4-1). Used to
control the mower's left wheel when traveling
forward or reverse.
10. Right Steering Control (Figure 4-1). Used to
control the mower's right wheel when traveling
forward or reverse.
11. 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.
12. Fuel Tank Gauge (Figure 4-1). Indicates the
amount of fuel in the fuel tank.
13. 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. The levers must be in this position
during operation of the mower. Rotating the levers
counter-clockwise allows the mower to be moved by
hand (free-wheeling).
14. Deck Lift Foot Lever (Figure 4-1). Used to raise
and lower the cutter deck.
Figure 4-2 DumpValve Control
15. Cutting Height Adjustment (Figure 4-1). Used to
set the cutter deck at the desired cutting height.
16. 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.
17. Temperature Gauge (Figure 4-1). Indicates the
operating temperature of the engine. Used on
mowers with the Kawasaki liquid cooled engine
only.
4.2 SAFETY INTERLOCK SYSTEM
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.
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.
WARNING:
390S141-1
DUMP VALVE
CONTROL

12
Section 4
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.
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. Tighten 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, 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. Place the PTO switch in the disengaged position.
5. If the engine is cold, choke the engine as needed.
6. Move the engine throttle control to about half
engine speed.
7. Turn the ignition key to the START position and
release the key as soon as the engine starts. Do not
hold the key in the START position for more than 15
seconds at a time. Allow at least 60 seconds
between each cranking attempt to prevent
overheating of the starter motor. Prolonged cranking
can damage the starter motor and shorten battery
life.
8. Allow engine to warm before operating the mower.
4.5 GROUNDTRAVEL 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.
Practice operating the mower until you are
comfortable with the controls before proceeding
to mow.
Forward Travel
To travel forward with the mower, disengage the parking
brake and slowly push the steering control levers
forward an equal distance. The further the steering
control levers are pushed forward the greater the forward
speed will be. To increase the speed, push the steering
control levers further forward and to decrease the speed,
pull the steering control levers back.
To stop the forward travel, pull the steering control
levers back to the neutral position.
CAUTION:

13
Section 4
To steer the mower left while traveling forward, pull the
left steering lever back. The further the lever is pulled
back, the quicker the mower will turn left.
To steer the mower right while traveling forward, pull
the right steering control lever back. The further the
lever is pulled back, the quicker the mower will turn
right.
-NOTE-
Smooth operation of the steering levers will
produce smooth mower operation. While
learning the operation of the steering controls,
keep the travel speed low.
-IMPORTANT-
Do not travel forward over a curb. The mower
will hang up on the curb. Raise the deck and
travel backwards over the curb at a 45 degree
angle. (see section 4.13 for cutter deck raising
instructions)
Reverse Travel
To travel in reverse, pull both handles back. Keep the
travel speed low while traveling in reverse.
-NOTE-
The mower will not travel straight in reverse.
Slight adjustments must be made using the
steering controls.
To steer left while traveling in reverse, allow the left
steering control lever to move forward. The further the
control is allowed to move forward, the quicker the
mower will turn left.
To steer right while traveling in reverse, allow the right
steering control lever to move forward. The further the
control is allowed to move forward, the quicker the
mower will turn right.
To stop the reverse travel, allow the steering control
levers to return to the neutral position. If the mower is
to be parked, engage the parking brake.
4.6 ENGAGINGTHE 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.
3. To disengage the deck drive, push the switch in to
the disengage position.
Figure 4-3 Cutter Engage Switch
STT99CES
PULL UP TO ENGAGE
PUSH DOWN TO DISENGAGE
Before backing up, observe behind the mower for
persons and obstructions. Clear the area before
backing up. Possible injury or property damage
could occur.
CAUTION:
CAUTION:
Disengage power to the mower before backing
up. Do not mow in reverse unless absolutely
necessary and then only after observation of the
entire area behind the mower.

14
Section 4
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
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. ALWAYS FOLLOW OSHA APPROVED
OPERATION.
1. The 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. To 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.
5. Turn the ignition key to the OFF position and
remove the key.
WARNING:
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-
Do 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.
4. After the mower has cooled down, fill the fuel tank
with fresh, clean fuel at the end of every day of
operation.
5. Check the tire pressure. Adjust pressure if
necessary.
To avoid injury from burns, allow the mower to
cool before removing the fuel tank cap and
refueling.

15
Section 4
4.10 REMOVING CLOGGED MATERIAL
ROTATING BLADES
NEVER PUTYOUR HANDS INTOTHE 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. Then
resume normal mowing.
4.11 MOVING MOWER WITH ENGINE
STOPPED
To “free-wheel” or move the mower around without the
engine running, place the dump valve levers in the
FREE-WHEEL position (Figure 4-2). Disengage the
parking brake and move the mower by hand. The 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 require
extra power.
2. The 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. The 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.

Section 6
23
6.6 CUTTER DECK ADJUSTMENTS
Cutter deck level, pitch and height are set at the factory.
However, if these adjustments should ever need to be
made, the following procedures will aid in obtaining the
proper cutter deck adjustment.
-NOTE-
Before proceeding with the cutter deck
adjustments, be sure that all tires are properly
inflated.
3. Tighten the serrated hex nut to secure the cutter
deck in the proper position.
Cutter Deck Pitch
The pitch of the cutter deck should be 1/4" down toward
the front of the cutter deck for proper cutting
performance. To check for proper deck pitch, be sure
that the mower is on a flat, level surface and the tires are
properlyinflated.
Check the distance from the bottom of the cutter deck to
the floor at the rear RH side of the cutter deck directly
behind the cutter deck hanging chains. Next check the
distance from the bottom of the cutter deck to the floor
at the front RH side of the cutter deck directly in front of
the cutter deck hanging chains. The measurement at the
front of the cutter deck should be 1/4" lower than the
measurement at the rear of the deck. Make these
measurements at the LH side of the cutter deck also. If
the measurement at the front of the deck is not 1/4"
lower, the cutter deck pitch must be adjusted as follows:
Cutter Deck Level
The cutter deck should be level from side-to-side for
proper cutting performance. To check for level, be sure
that the mower is on a flat, level surface, the tires are
properly inflated and the cutter deck is set at the most
common cutting height that you will use. On the RH side
of the machine, check the distance from the bottom of
the cutter deck to the floor. Next check the distance
from the bottom of the cutter deck to the floor on the LH
side of the machine. Both measurements should be the
same. If the two measurements are different, the cutter
deck level must be adjusted as follows:
1. On the front LH side of the cutter deck locate the
cutter deck adjusting bolt.
Figure6-5.CutterDeckAdjustment
2. Loosen the serrated flange hex nut and move the bolt
up or down in the slot to adjust the cutter deck until
the distance from the bottom of the cutter deck to
the floor is the same as the measurement on the RH
side of the machine.
1. Loosen the jam nut on both adjusting rods. (See
Figure 6.5)
2. Using a wrench on the jam nut (See Figure 6.5) turn
the adjusting rods until the 1/4" forward pitch is
obtained on both the RH and the LH side of the
cutter deck. Tighten both jam nuts.
-NOTE-
To prevent the cutter deck from teetering, all four
cutter deck hanging chains must have tension on
them. If all four chains do not have tension on
them and the deck teeters, you must readjust the
cutter deck as outlined in the procedures above.
390S0174-1
JAM NUT
ADJUST HERE

Section 6
24
Cutter Deck Height
The cutter deck height adjustment is made to ensure that
the cutter deck is cutting at the height indicated on the
cutting height index gauge. To check for proper deck
height, be sure that the mower is on a flat, level surface
and the tires are properly inflated.
1. Place the cutter deck in the transport position.
Loosen the jam nuts on both ends of the deck height
control rod. (See Figure 6.6)
Figure 6-6. Cutter Deck Height Adjustment
2. Turn the control rod (See Figure 6.6) until there is a
1/4" space between the rear deck stop and the top of
the cutter deck. (See Figure 6.7). Tighten the jam
nuts on the control rod.
Figure 6-7. Cutter Deck Stop
3. Check the cutter deck cutting height by placing the
lanyard pin in the 3" position on the cutting height
index. Release the deck from the transport position
and allow the deck to move to the 3" cutting height
position.
4. Check the measurement from the floor to the cutter
blade tip. If the measurement is not at 3", an
adjustment can be made using the deck height
control rod. (See Figure 6.6)
-NOTE-
If an adjustment had to be made, be sure that the
cutter deck can easily be locked into the
transport position.
1/4"
DECK
STOP
390S0175-1
CUTTING
HEIGHT
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
481543
390S014A-1
HEIGHT ADJUSTMENT PEDAL
LANYARD
PIN
LOOSEN HERE

Section 7
25
MAINTENANCE
7.1 MAINTENANCE CHART - RECOMMENDED SERVICE INTERVALS
* Perform these maintenance procedures more frequently under extreme dusty or dirty conditions
HOURS
Break-In 8 40 100 200 500 Procedure Comments
(First 10)
X Check all hardware for tightness
X Check hydraulic oil level See paragraph 7.3
X Check all belts for proper alignment See paragraph 7.8
X Change engine oil and filter See paragraph 7.4
(First 5)
X Check hydraulic hoses for leaks Use extremecautionwhen
checking the hydraulic hoses
See paragraph 2.5
X Check coolant level See paragraph 7.12
X Checkengineoillevel See paragraph 7.4
X *Cleanmower See paragraph 7.14
X Check condition of blades See paragraph 7.9
X Apply grease to fittings See paragraph 7.2
X Check tire pressure See paragraph 7.10
X Check coolant level See paragraph 7.12
X Check battery electrolyte level, See paragraph 7.7
clean battery posts and cables
X Check belts for proper alignment See paragraph 7.8
X Apply grease to fittings See paragraph 7.2
X Change engine oil See paragraph 7.4
X *Clean air cleaner element See paragraph 7.6
X Check lubricant in cutter deck gearbox See paragraph 7.11

26
Section 7
+ Compatible Greases: Mobilix #2 found at Mobil Service Stations
Ronex MP found at Exxon Service Stations
Super Lube MEP #2 & Super Stay-M #2 found at Conoco Stations
Shell Alvania #2 found at Shell Service Stations
Lidok EP #2 found at industrial shops
MAINTENANCE CHART - RECOMMENDED SERVICE INTERVALS (CONT'D)
HOURS
Break-In 8 40 100 200 500 Procedure Comments
(First 10)
X Apply grease to fittings See paragraph 7.2
X Check hardware for tightness
X Change engine oil filter See paragraph 7.4
X Check hydraulic oil level See paragraph 7.3
X Replace engine fuel filter See paragraph 7.5
X Drain hydraulic system and See paragraph 7.3
replace hydraulic oil Use SAE 20W50
Motor Oil
X Replace hydraulic oil filter See paragraph 7.3
X Replace cutter deck gearbox lubricant See paragraph 7.1
X Changecoolant See paragraph 7.12
7.2 LUBRICATION
GREASE FITTING LUBRICATION CHART
(SEE FIGURE 7-1)
LUBRICATION NO. OF
LOCATION INTERVAL LUBRICANT PLACES
1 Caster Wheel Pivot 500Hours/Yearly Chassis Grease 2
2 Caster Wheel Bearings 100Hours/Bi-Weekly Chassis Grease 2
3 Brake Actuator 200 Hours/Monthly Chassis Grease 2
4 Cutter Deck Bellcranks 40 Hours/Weekly Chassis Grease 4
5 Cutter Deck Pusharms 100Hours/Bi-Weekly Chassis Grease 2
6 PTO Spindle 40 Hours/Weekly +LithiumMP WhiteGrease2125 1
7 Cutter Deck Spindle 40 Hours/Weekly +LithiumMPWhite Grease2125 3
8 BrakeHandle 200 Hours/Monthly Chassis Grease 1
9 Cutter Deck Drive Shaft 40 Hours/Weekly Chassis Grease 3

Section 7
27
Figure 7.1 Lubrication Fitting Points
390S0145-1
GREASE FITTING LUBRICATION
Lubricant Interval
Lithium MP White Grease 2125
(40 Hours/Weekly)
Chassis Grease
(100 Hours/Bi-monthly)
Chassis Grease
(200 Hours/Monthly)
Chassis Grease
(500 Hours/Yearly)
24 5
9
8
1
637

28
Section 7
7.3 HYDRAULIC SYSTEM
A. Checking Hydraulic Oil Level
The hydraulic oil level should be checked after the first
10 hours of operation. Thereafter, check the oil after
every 200 hours of machine operation or monthly,
whichever occurs first.
-IMPORTANT-
If the oil level is consistently low, check for
leaks and correct immediately.
1. Wipe dirt and contaminants from around the
reservoir cap. Remove the cap from the hydraulic oil
reservoir.
2. Visually check the level of hydraulic oil. Hydraulic
oil must be at least 3-1/4" inches from top of the
filler neck. If the level cannot be determined visually,
use a clean tape measure to check the level. If the
fluid is low, add 20W50 motor oil. DO NOT
overfill; (overfilling the oil reservoir may cause oil
seepage around the cap area).
3. Clean the fill cap and install it onto the reservoir.
B. Changing Hydraulic Oil
The hydraulic oil should be changed after every 500
hours or annually, whichever occurs first. The oil should
also be changed if the color of the fluid has become black
or milky. A black color and/or a rancid odor usually
indicates possible overheating of the oil, and a milky
color usually indicates water in the hydraulic oil.
-NOTE-
The hydraulic oil should be changed if you
notice the presence of water or a rancid
odor to the hydraulic oil.
1. Park the mower on a level surface and stop the
engine.
2. Place a suitable container under the hydraulic oil
reservoir. Remove the fill cap from the reservoir.
Remove the drain plug from the bottom of the
reservoir. (See Figure 7-2). Allow the fluid to drain
into the container and properly discard it.
3. Re-install the drain plug into the reservoir and be
sure it is tight.
-NOTE-
Before refilling the hydraulic oil reservoir
the hydraulic oil filter should be changed as
outlined in section C on the next page.
4. Fill the reservoir to 3-1/4" inches from the top of the
filler neck with 20W50 motor oil.
5. Replace the reservoir fill cap. Start the engine and
drive forward and backward for two minutes. Check
the oil level in the reservoir. If necessary, add oil to
the reservoir.
Figure 7-2 Hydraulic Oil Reservoir
Hydraulic Oil
Reservoir STT99HOR-1

38
CUTTER DECK CONTROLS
STT99CDC-1
21
19
37
42
4
6
14
10 42
5
2
3
35
23
41
25
3832
34
41
30 27
33
40
41
28
28
24 26 41
40
CUTTER DECK
13
40
39 31
41
40 39
43
9
8
45 20
18
36
16
44
17
41 40
26
11
29
22
40
41
15
22
41
7
1
46
40
24
12
26 29
41