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MODEL STT-31BSG
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 03121
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Table of Contents
Related Manuals for Scag Power Equipment STT-31BSG
Summary of Contents for Scag Power Equipment STT-31BSG
- Page 1 MODEL STT-31BSG 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.
- Page 2 This manual covers the operating instructions STT-31BSG with a serial number of 8580001 to 8589999 SMST-61A with a serial number of 8600001 to 8609999...
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Page 3: Table Of Contents
TABLE OF CONTENTS SUBJECT Section 1 - General Information Introduction ...1 Directional Reference ...1 Servicing the Engine and Drive Train Components ...1 Section 2 - Safety Information Symbols ... 2-3 Introduction ...4 Signal Words ...4 Before Operation Considerations ...4 Operation Considerations ...5 Maintenance Considerations ...6 Safety and Instructional Decals ...7 Section 3 - Specifications ... -
Page 4: Subject Page
Deck Drive Components ... 44-45 Radiator, Coolers & Engine Brackets...46-47 Brake & Steering Components..48-49 Fuel & Hydraulic System ... 50-51 Electrical System ... 52-53 Hydraulic Pump Assembly - BDP-21L ... 54-55 Wire Harness, STT-31BSG ... 56 Replacement Decals ... 57-58 PAGE... -
Page 5: Section 1 - General Information
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. -
Page 6: Symbols
ISO Symbols SYMBOL DESCRIPTION Choke Parking Brake On/Start Off/Stop CE Mark SYMBOL DESCRIPTION Transmission Spinning Blade 48071S Spring Tension on Idler WARNING Falling Hazard FALLING HAZARD USE ONLY SCAG APPROVED RIDING ATTACHMENTS SEE OPERATOR'S MANUAL 481109... -
Page 7: Symbols
SYMBOL DESCRIPTION Fast Continuously Variable - Linear Pinch Point 481039S Hourmeter/Elapsed Operating Hours Thown Object Hazard Keep Bystanders Away SYMBOL DESCRIPTION Slow Cutting Element - Basic symbol Cutting Element - Engage Cutting Element - Disengage Read Operator's Manual... -
Page 8: Introduction
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. -
Page 9: Operation Considerations
Section 2 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. -
Page 10: Maintenance Considerations
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. -
Page 11: Safety And Instructional Decals
Section 2 2.6 SAFETY AND INSTRUCTIONAL DECALS WARNING INSTALL BELT COVER BEFORE OPERATING MACHINE READ OPERATOR'S MANUAL 481039 481039 482285 FORWARD REVERSE 481568 482286 482290 482580 482710 390S0150C... -
Page 12: Section 3 - Specifications
SCAG “SABRE TOOTH TIGER” ZERO-TURN RIDER ENGINE General Type: Brand: Model: Horsepower: Type: Displacement: Cylinders: Governor: Air Intake Group: Exhaust Group: Fuel Pump Group: Oil Pump Group: Valve Group: Electrical/Charging System: ENGINE DECK Fuel Tank: Drive Wheels/Tires: Parking Brake: Frame: DRIVE SYSTEM Type: Hydro Pumps:... -
Page 13: Cutter Deck
Section 3 SPECIFICATIONS (CON'T) SCAG “SABRE TOOTH TIGER” ZERO-TURN RIDER CUTTER DECK Type: Construction: True Cutting Width: Cutting Height Adjustment: Cutter Blades: Cutter Deck Drive: Blade Engagement: Discharge Opening: Caster Wheels: Spindles: Spindle Pulleys: Cutter Deck Belts: Anti-Scalp Rollers: ADDITIONAL SPECIFICATIONS Seat: APPROXIMATE DIMENSIONS Length:... -
Page 14: Section 4 - Operating Instructions
OPERATING INSTRUCTIONS CAUTION: Do not attempt to operate this mower unless you have read this manual. Learn the location and purpose of all controls and instruments before you operate this mower. 4.1 CONTROLS AND INSTRUMENT IDENTIFICATION Before operating the mower, familiarize yourself with all mower and engine controls. -
Page 15: Safety Interlock System
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. -
Page 16: Initial Run-In Procedures
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. -
Page 17: Engaging The Deck Drive
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. -
Page 18: Hillside Operation
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 WARNING: DO NOT operate on steep slopes. To check a slope, attempt to back up it (with the cutter deck down). -
Page 19: Removing Clogged Material
Section 4 4.10 REMOVING CLOGGED MATERIAL ROTATING BLADES NEVER PUT YOUR HANDS INTO 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. -
Page 20: Adjusting Cutting Height
4.13 ADJUSTING CUTTING HEIGHT The mower deck can be adjusted from a height of 1-inch to 6 inches at 1/4-inch intervals. To adjust the 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. -
Page 21: Section 5 - Troubleshooting Cutting Conditions
Section 5 TROUBLESHOOTING CUTTING CONDITIONS CONDITION Stringers - Occasional Blades of Uncut Grass Width of Deck SGB020 Streaking - Strips of Uncut Grass in Cutting Path Width of Deck SGB018 Streaking - Strips of Uncut Grass Between Cutting Paths Width Width Deck Deck... - Page 22 TROUBLESHOOTING (CONT'D) CONDITION Uneven Cut on Flat Lift worn from blade Ground - Wavy High-Low Blade upside down Appearance, Scalloped Cut, or Rough Contour Deck plugged, grass accumulation Too much blade angle (deck pitch) Deck mounted improperly Bent spindle area Dull blade Width of Deck SGB020...
- Page 23 Section 5 TROUBLESHOOTING (CONT'D) CONDITION Scalping - Blades Low tire pressures Hitting Dirt or Cutting Very Close to Ground speed too fast the Ground Cutting too low Rough terrain Ground speed too fast Width of Deck Wet grass SGB022 Step Cut - Ridge Blades not mounted evenly in Center of Cutting path...
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Page 24: Section 6 - Adjustments
ADJUSTMENTS 6.1 PARKING BRAKE ADJUSTMENT WARNING: Do not operate the mower if the parking brake is not operable. Possible severe injury could result. The parking brake linkage should be adjusted whenever the parking brake lever is placed in the “ENGAGE” position and the parking brake will not prevent the mower from moving. -
Page 25: Neutral Adjustment
Section 6 B. The steering control levers are in the full forward position and the mower pulls to one side or the other when traveling in a forward direction. (Tracking Adjustment, See Page 22). Neutral Adjustment 1. Be sure the dump valve levers are in the run position and the steering control levers are in the neutral lock position. -
Page 26: Throttle Control And Choke Adjustments
Tracking Adjustment CAUTION: Stop the engine and remove the key from the ignition before making any adjustments. Wait for all moving parts to come to a complete stop before beginning work. CAUTION: The engine and drive unit can get hot during operation causing burn injuries. -
Page 27: Cutter Deck Adjustments
Section 6 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. - Page 28 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.
- Page 29 Section 6 To adjust the Custom-Cut Baffle height: 1. Place the cutter deck in the transport position. 2. Remove the hardware securing the Custom-Cut Baffle to the cutter deck. (See Figure 6.8). -NOTE- Hardware location used in the illustrations are for reference only.
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Page 30: Maintenance Chart
7.1 MAINTENANCE CHART - RECOMMENDED SERVICE INTERVALS HOURS Break-In 40 100 200 500 (First 10) (First 5) * Perform these maintenance procedures more frequently under extreme dusty or dirty conditions MAINTENANCE Procedure Check all hardware for tightness Check hydraulic oil level Check all belts for proper alignment Change engine oil and filter Check hydraulic hoses for leaks... -
Page 31: Lubrication Fitting Points
Section 7 MAINTENANCE CHART - RECOMMENDED SERVICE INTERVALS (CONT'D) HOURS Break-In 40 100 200 500 (First 10) 7.2 LUBRICATION GREASE FITTING LUBRICATION CHART (SEE FIGURE 7-1) LOCATION Caster Wheel Pivot Caster Wheel Bearings Brake Actuator Cutter Deck Bellcranks Cutter Deck Pusharms PTO Spindle Cutter Deck Spindle Brake Handle... - Page 32 Figure 7.1 Lubrication Fitting Points Section 7 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 ) 390S0145-2...
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Page 33: Hydraulic System
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. -
Page 34: Engine Oil
HYDRAULIC OIL FILTER Figure 7-3 Hydraulic Oil Filter C. Changing Hydraulic Oil Filter Element The hydraulic oil filter should be changed after every 500 hours of operation or annually, whichever occurs first. 1. Remove the oil filter element (Figure 7-3) and properly discard it. -
Page 35: Engine Fuel System
Section 7 7.5 ENGINE FUEL SYSTEM To avoid injury from burns, allow the mower to cool before removing the fuel tank cap and refueling. STT99FF-1 Figure 7-5 Fuel Filter A. Filling the Fuel Tank Fill the fuel tank at the beginning of each operating day to within 1 inch below the filler neck. - Page 36 WARNING: Lead-acid batteries produce flammable and explosive gases. To avoid personal injury when checking, testing or charging batteries, DO NOT use smoking materials near batteries. Keep arcs, sparks and flames away from batteries. Provide proper ventilation and wear safety glasses. WARNING: Battery posts, terminals, and related accessories contain lead and lead compounds, chemicals...
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Page 37: Drive Belts
Section 7 WARNING: BATTERIES PRODUCE EXPLOSIVE GASES. Charge the battery in a well ventilated space so gases produced while charging can dissipate. Charging rates between 3 and 50 amperes are satisfactory if excessive gassing or spewing of electrolyte does not occur or the battery does not feel excessively hot (over 125°F). -
Page 38: Tires
Angle Blade Back Do Not Cut In Figure 7-9 Blade Sharpening 2. Check the balance of the blade. If the blades are out of balance, vibration and premature wear can occur. See your authorized Scag dealer for blade balancing or special tools, if you choose to balance your own blades. -
Page 39: Cutter Deck Gearbox
Section 7 7.11 CUTTER DECK GEARBOX A. Checking Lubricant Level CAUTION: The cutter deck gearbox can reach high operating temperatures. Allow the cutter deck gearbox to cool before servicing. CHECK PLUG Figure 7-12 Cutter Deck Gearbox The fluid level in the cutter deck gearbox (Figure 7-12) should be checked after every 100 hours of operation or bi-weekly, whichever occurs first. -
Page 40: Body, Deck, Hopper And Upholstery
3. Replace the radiator cap. Push down on the cap and turn clockwise until it stops. -NOTE- The cooling system should be flushed and the coolant replaced every 500 hours of op- eration or annually. See your Scag dealer for proper coolant replacement. - Page 41 NOTES...
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Page 42: Smst 61"Adv., 72" Adv. Cutter Decks
61A, 72A CUTTER DECKS 44 61 63 STT-BSG 2002 CD... - Page 43 61A, 72A CUTTER DECKS Ref. Part No. No. Description 461505 Cutter Deck, 61” Advantage (Includes Decals) 461507 Cutter Deck, 72” Advantage (Includes Decals) 04003-04 Bolt, Carriage 5/16-18 x 1" 04019-04 Nut, Hex Serrated Flange 3/8-16 481625-01 Wing nut, 3/8-16 481632 Anti-Scalp Wheel 04003-26 Bolt, Carriage 3/8-16 x 4"...
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Page 44: Cutter Deck Controls
CUTTER DECK CONTROLS CUTTER DECK STT2002CDC... - Page 45 CUTTER DECK CONTROLS Ref. Part Description 04041-07 Flatwasher, 3/8” 481764 Link, Deck Lift 481765 Rod End, Female - 1/2-20 RH 481766 Rod End, Female - 1/2-20 LH 04020-27 Nut, Jam 1/2-20 RH 04020-28 Nut, Jam 1/2-20 LH 04021-09 Nut, 3/8-16 Elastic Stop 482429 Slide Weldment, Height Adjustment 43391...
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Page 46: Sheet Metal Components
SHEET METAL COMPONENTS STT-BSG 2002 SMC... - Page 47 SHEET METAL COMPONENTS Ref. Part Description 451481 Fender Weldment, RH 04001-09 Bolt, Hex Head, 5/16-18 x 1, Zinc 43606 Spacer 04041-07 Flatwasher, 3/8-.391 x .938 x .105 451448 Seat Plate Weldment 482597 Seat Assembly w/armrest 04001-45 Bolt, Hex Head 3/8-16 x 2.0” 04021-09 Nut, Elastic Stop 3/8-16 482283...
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Page 48: Deck Drive Components
DECK DRIVE COMPONENTS REAR ENGINE ENGINE FLYWHEEL To A To B 2002 STTBSG-DDC... -
Page 49: Deck Drive Components
Ref. Part No. No. Description 422845 Belt Guard, Rear 481531 Hinge, Rear Belt Guard 481309 Latch, Hood 04003-07 Carr. Bolt 1/4-20 x .5” 04019-02 Nut, Serr. Flg. 1/4-20 04010-01 Screw, #10-32 x .5, Phillips Head 04031-01 Lock Washer, #10 04020-01 Nut, #10-32 451457 Weldment, Pump Mounting... -
Page 50: Radiator, Coolers & Engine Brackets
RADIATOR, COOLERS & ENGINE BRACKETS TO "A" ATTACHES FRAME... - Page 51 RADIATOR, COOLERS & ENGINE BRACKETS Ref. Part No. No. Description 481810 Radiator 481742 Hose, Upper Radiator 481743 Hose, Lower Radiator 04030-03 Lockwasher, 5/16 (.317 x .586 x .078) Helical Spring 423628 Bracket, Air Cleaner 423539 Bracket, Engine Mounting LH 423540 Bracket, Engine Mounting RH 422702 Bracket, Radiator Mounting...
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Page 52: Brake & Steering Components
BRAKE AND STEERING COMPONENTS 61 59 TO RH PUMP TO LH PUMP STT2002B&SC... -
Page 53: Brake & Steering Components
BRAKE AND STEERING COMPONENTS Ref. Part No. No. Description 482340 Grip, Handle Bar 461386 Handle Bar (Includes item 1) 04001-32 Bolt, Hex Head 3/8-16 x 1-1/4" 04030-04 Lockwasher, 3/8" 04041-07 Flatwasher. 3/8" (.391 x .938 x .105) 422372 Bar, Control Lever 451483 Control Lever Weldment, LH 451484... -
Page 54: Fuel & Hydraulic System
FUEL AND HYDRAULIC SYSTEM DUMP VALVE 43 (2) 43 (2) 44 45 50 To Carburetor To Back Side of Reservoir (Not Shown) 2002 STT-BSG F&HS.eps... -
Page 55: Fuel & Hydraulic System
FUEL AND HYDRAULIC SYSTEM Ref. Part No. No. Description 04110-01 U-Nut 1/4-20 48136-13 Hose Clamp, 0.69 dia. 04001-03 Bolt, Hex Head 1/4-20 x 2.0” 48811 Hose, 3/8” ID Pushlock - (order by inch) 482505 Cooler, Oil 482266-01 Elbow, 90 Degree - 9/16 O-ring x 3/8 Hose 482266-02 Elbow, 90 Degree - 3/4 O-ring x 3/8 Hose 48471-02 Oil Filter Base... -
Page 56: Electrical System
ELECTRICAL SYSTEM ELECTRICAL SYSTEM... -
Page 57: Electrical System
Ref. Part No. No. Description 481176-08 Cable, Positive Battery 481176-07 Cable, Negative Battery 461467 Clutch, Electric PTO 481808 Module, Interlock 482283 Battery (Not Avail. through Scag, Exide P/N 26R) 481687 Switch, PTO 48798 Switch, Key (Includes Nut and Lockwasher) 48017-03 Nut, 5/8-32 Special 48017-04 Lock Washer 5/8”... -
Page 58: Hydraulic Pump Assembly - Bdp-21L
HYDRAULIC PUMP ASSEMBLY - BDP-21L HYDRAULIC PUMP ASSEMBLY STT 2K BDP-21... -
Page 59: Hydraulic Pump Assembly - Bdp-21L
HYDRAULIC PUMP ASSEMBLY - BDP-21L Ref. Part Description HG 2510065 Housing Kit (Includes Housing, Journal Bearing) HG 2510066 End Cap HG 50641 Straight Headless Pin HG 50633 Socket Head Screw HG 50381 End Cap Gasket HG 2510071 Charge Pump Kit (Includes Charge Cover, Gerotor Assy., O-Ring) HG 50406 Gerotor Assembly HG 9004100-1430... -
Page 60: Wire Harness, Stt-31Bsg
WIRE HARNESS, STT - 31BSG PART NUMBER 482523... -
Page 61: Replacement Decals
MOWER DECK PULL OUT TO ENGAGE 481669 PUSH IN TO DISENGAGE 481669 CHOKE 482507 482507 482286 48656 Hea vy- Duty Comm e rcial 481971 481971 481039 SLOW FAST 482565 481955 - 61A 481956 - 71A 48404 482580 482493 STT-31BSG Decals... -
Page 62: Replacement Decals
REPLACEMENT DECALS AND INFORMATION PLATES 48825 48314 481937 481921 482165 481921 481921 481925 481663 481664 482710 STT-31BSG Decals 2... - Page 63 * Engines and electric starters are covered by the engine manufacturer’s warranty period. * Major drive system components are warranted for two (2) years by Scag Power Equipment. (Parts and labor 1st year; Parts only 2nd year) (Two year warranty exclude fittings, hoses, drive belts). The repair or replacement of the hydraulic pump or hydraulic motor will be at the option of Scag Power Equipment.
- Page 64 © 2002 PART NO. 03121 SCAG POWER EQUIPMENT PRINTED 7/02 DIVISION OF METALCRAFT OF MAYVILLE, INC. PRINTED IN USA...