Scag Power Equipment STT-31BSG manual

MODEL STT-31BSG OPERATOR’S MANUAL THIS MANUAL CONT AINS THE OPERA TING INSTRUCTIONS AND SAFETY INFORMA- TION FOR YOUR SCAG MOWER. READING THIS MANUAL CAN PROVIDE YOU WITH ASSIST ANCE IN MAINTENANCE AND AD- JUSTMENT PROCEDURES TO KEEP YOUR MOWER PERFORMING TO MAXIMUM EFFI- CIENCY . THE SPECIFIC MODELS THA T THIS BOOK COVERS ARE CONT AINED ON THE I[...]

F AILURE TO FOLLOW SAFE OPERA TING PRACTICES MA Y RESUL T 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 wires and ignition key . * If a mechanism becomes clogged, stop the engine before cleaning. * Keep hands, feet and[...]

I T ABLE OF CONTENTS SUBJECT P AGE Section 1 - General Information 1.1 Introduction ............................................................................................................................. 1 1. 2 Directional Reference ....................................................................................................... ...... [...]

II T ABLE OF CONTENTS (CONT'D) SUBJECT P AGE Section 6 - Adjustments 6. 1 Parking Brake Adjustment .................................................................................................... 20 6. 2 T ravel Adjustments .......................................................................................................... ..... 2 0 [...]

1 GENERAL INFORMA TION 1.1 INTRODUCTION Y our mower was built to the highest standards in the industry . However , the prolonged life and maximum ef ficiency 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 [...]

2 CE Mark T ransmission Choke On/Start Spring T ension on Idler Oil Off/Stop SYMBOL DESCRIPTION SYMBOL DESCRIPTION ISO Symbols Spinning Blade 48071S Parking Brake WARNING FALLING HAZARD USE ONLY SCAG APPROVED RIDING ATTACHMENTS SEE OPERATOR'S MANUAL 481109 Falling Hazard[...]

3 Slow Fast Cutting Element - Engage Cutting Element - Basic symbol Cutting Element - Disengage Continuously V ariable - Linear Read Operator's Manual Keep Bystanders A w ay Pinch Point 481039S SYMBOL DESCRIPTION SYMBOL DESCRIPTION Hourmeter/Elapsed Operating Hours Thown Object Hazard[...]

4 SAFETY INFORMA TION 2.1 INTRODUCTION Y our 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 stora[...]

5 10. DO NOT add fuel to a running or hot engine. Allow the engine to cool for several minutes before adding fuel. 1 1. Keep flammable objects (cigarettes, matches, etc.), open flames and sparks away from the fuel tank and fuel container . 12 . Equipment must comply with the latest requirements per SAE J137 and/or ANSI/ASAE S279 when driven on publ[...]

6 Section 2 2.4 OPERA TION CONSIDERA TIONS (CONT'D) 3. T o 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 t[...]

7 Section 2 2.6 SAFETY AND INSTRUCTIONAL DECALS WARNING INSTALL BELT COVER BEFORE OPERATING MACHINE READ OPERATOR'S MANUAL 481039 390S0150A 481568 FORWARD REVERSE F R IMPOR T ANT ADJUSTMENT PROCEDURES READ OPERA T OR'S MANUAL FOR MORE DET AILS NEUTRAL ADJUSTMENT TRACKING ADJUSTMENT FREE WHEEL OPERA TION HYDRA ULIC T ANK FLUID LEVEL Check [...]

8 SPECIFICA TIONS Section 3 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: 31 HP @ 3600 RPM Type: water cooled 4 cycle, overhead valve, 3 cylinder, gas engine Displacement: 952 cc Cylinders: 3 inline [...]

9 Section 3 SPECIFICA TIONS (CON'T) SCAG “SABRE TOOTH TIGER” ZERO-TURN RIDER MODEL: STT– 31BSG CUTTER DECK 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 allow[...]

10 Section 4 OPERA TING 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 IDENTIFICA TION Before operating the mower , familiarize yourself with all mower and engine controls. Knowing the locat[...]

11 Section 4 5 . V oltmeter (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 (Figur[...]

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. T i[...]

13 Section 4 T o 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. T o 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. -NOT[...]

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 OPERA TION DO NOT operate on steep slopes. T o check a slope, attempt to back up it (with the cutter deck down). If the machine can bac[...]

15 Section 4 4.10 REMOVING CLOGGED MA TERIAL 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. 4.1 1 MOVING MOWER WITH ENGINE STOPPED T o free-wheel or move the mower around without the engine running, place the [...]

16 Section 4 4.13 ADJUSTING CUTTING HEIGHT The mower deck can be adjusted from a height of 1-inch to 6 inches at 1/2-inch intervals. T o adjust the cutting height: 1. Push the cutting height adjustment foot pedal all the way forward using your right foot until it locks in place. (Figure 4-6). 2. Insert the lanyard pin into the cutting height index [...]

Section 5 17 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 accumulation Clean underside of deck Bel ts slip ping Adjust belt tension Streaking [...]

Section 5 18 Uneven Cut on Flat Lift worn from 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 accumulation Clean underside of deck Too much blade angle (deck pitch) Adjust pitch and level Deck mounted improperly See your authorized SC[...]

Section 5 19 Scalping - Blades Low tire pressures Check and adjust pressures Hitting Dirt or Cutting Very Close to Ground speed too fast Slow speed to adjust for conditions the Ground Cutting too low May need to reduce ground speed, raise cutting height, change direction of cut, and/or change pitch and level Rough terrain May need to reduce ground [...]

Section 6 20 ADJUSTMENTS 6.1 P ARKING 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. If the [...]

Section 6 21 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. (T racking 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. 2. W ith [...]

Section 6 22 T racking Adjustment Stop the engine and remove the key from the ignition before making any adjustments. W ait for all moving parts to come to a complete stop before beginning work. The engine and drive unit can get hot during operation causing burn injuries. Allow engine and drive components to cool before making any adjustments. -NOT[...]

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- Befor e pr oceeding with the cutter deck adjustments, be sur e that all tir es are pr operly inflat[...]

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. T o 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. L[...]

Section 7 25 MAINTENANCE 7.1 MAINTENANCE CHART - RECOMMENDED SERVICE INTER V ALS * Perform these maintenance procedures more frequently under extreme dusty or dirty conditions HOURS Break-In 8 4 0 10 0 200 500 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 [...]

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 INTER V ALS (CONT'D) HOURS Break-I[...]

Section 7 27 Figure 7.1 Lubrication Fitting Points 390S0145 GREASE FITTING LUBRICATION LUBRICANT / INTERVAL LITHIUM MP WHITE GREASE 2125 ( 40 HOURS / WEEKLY ) CHASSIS GREASE ( 100 HOURS / BI-MONTHLY ) CHASSIS GREASE ( 200 HOURS / MONTHLY ) 4 1 6 3 5 7 2 1 8 4 3 9 CHASSIS GREASE ( 500 HOURS / YEARLY ) 5 9 2[...]

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. -IMPORT ANT - If the oil level is consistently low , check for leaks and corr ect immediately . [...]

Section 7 29 A. Checking Engine Crankcase Oil Level The engine oil level should be checked after every 8 hours of operation or daily as instructed in the Engine Operator  s Manual furnished with this mower (See Figure 7-4). B. Changing Engine Crankcase Oil After the first 5 hours of operation, change the engine crankcase oil and replace the oil [...]

30 Section 7 7.5 ENGINE FUEL SYSTEM A. Filling the Fuel T ank Fill the fuel tank at the beginning of each operating day to within 1 inch below the filler neck. Do not overfill. Use clean, fresh unleaded gasoline with a minimum octane rating of 87. B. Replacing In-Line Fuel Filter Element -NOTE- The fuel filter is located below the hydraulic tank. F[...]

Section 7 31 Electric storage battery fluid contains sulfuric acid which is POISON and can cause SEVERE CHEMICAL BURNS. A void contact of fluid with eyes, skin, or clothing. Use proper protective gear when handling batteries. DO NOT tip any battery beyond 45° angle in any direction. If fluid contact does occur , follow first aid suggestions below [...]

32 Section 7 WARNING: BA TTERIES 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). If spewing or gassi[...]

Section 7 33 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. C. Blade Replacement 1. Remove the ignition key before replacing the blades. 2. Raise t[...]

34 Section 7 The cutter deck gearbox can reach high operating temperatures. Allow the cutter deck gearbox to cool before servicing. CAUTION: 7.1 1 CUTTER DECK GEARBOX A. Checking Lubricant Level 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. 1. Low[...]

Section 7 35 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 r eplaced every 500 hours of op- eration or annually. See your Scag dealer for proper coolant replacement. B. Cleaning the Radiator Debris Screen After each day of operation, remove and clean [...]

36 61A, 72A CUTTER DECKS 44 61 63 69 62 12 65 64 52 58 54 17 59 24 14 56 28 56 33 3 A A B B 4 14 29 20 53 28 52 24 58 24 52 62 66 32 13 68 55 55 29 58 2 3 13 23 68 57 23 3 11 50 13 46 60 49 67 24 35 48 9 16 19 15 27 26 12 47 51 23 23 36 37 44 39 43 42 38 45 41 34 72 22 40 37 18 10 1 5 7 68 STT-BSG-2001CD 14 29 12 30 28 31 25 31 21 22A B 3 B 56 32 3[...]

37 Ref. Part No. No. Description Ref. Part No. No. Description 40 43296 Spacer, Inside 41 481025 Seal, Bottom 42 43297 Spindle Bushing, Bottom 43 481035 Nut, Special 1 - 1/16-18 44 48114-04 Grease Fitting 45 48677 Relief Fitting, Tapered Spindle 46 482245 Spring, Discharge Chute 47 48038 Guide, Roller 48 482001 Cutter Blade, 21.0” 61” 48 482002[...]

38 CUTTER DECK CONTROLS CUTTER DECK 16 1 2 3 5 6 7 7 8 9 10 11 12 13 14 15 16 17 18 20 21 22 23 24 24 18 16 16 16 25 25 26 26 16 16 27 16 19 25 28 29 30 29 31 32 33 34 35 36 36 24 24 31 39 40 41 24 24 36 42 36 35 24 31 39 43 36 24 44 45 46 47 48 49 50 37 38 2001 STTBSG-CDC 51 52 4[...]

39 Ref. Part No. No. Description CUTTER DECK CONTROLS * Common hardware which should be purchased locally. All bolts Grade 5 plated, all other fasteners zinc plated. 1 481428 Grip, Deck Latch 2 46975 Deck Latch (Includes items 20& 21) 3 04009-02 Bolt, Shoulder 1/2 x 3/4" 4 04012-09 Set Screw, 5/16-18 x 1/2" Sq. Head 5 422346 Lockplate[...]

40 SHEET MET AL COMPONENTS T O "A" "A" 2 1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 33 19 21 22 22 23 24 25 26 27 28 28 20 29 30 31 32 19 20 34 35 36 36 37 38 39 40 41 42 43 44 47 48 45 46 46 45 49 51 50 52 53 54 55 56 15 57 58 57 58 15 59 60 2001 STTBSG-SMC[...]

41 1 422567 Footplate 2 451079 Fender, RH 3 451078 Fender, LH 4 422683 Box, Battery 5 45925 Plate, Lower Seat 6 481825 Footrest 7 481780 Insulation, Battery Cover 8 422682 Cover, Battery 9 48566 Cable, Seat Stop 10 482147 Seat 482344 Armrest, Both Sides 482343 Cover, Armrest 482342 Cover, Lower Cushion 482341 Cover, Backrest 11 461232 Track Set, Se[...]

42 A To A B To B DECK DRIVE COMPONENTS TO REAR OF ENGINE TO ENGINE FL YWHEEL 1 2 3 4 5 6 7 8 9 4 10 11 12 13 14 15 16 17 18 19 20 21 22 22 23 24 24 25 25 26 27 27 28 29 30 31 32 33 34 35 36 37 38 42 40 41 39 43 43 35 44 44 45 46 47 43 48 35 49 50 51 52 53 43 55 54 43 55 45 57 43 58 48 49 35 59 59 60 61 59 62 63 64 65 65 35 35 65 35 66 59 67 68 42 4[...]

43 1 422845 Belt Guard, Rear 2 481531 Hinge, Rear Belt Guard 3 481309 Latch, Hood 4 04003-07 Carr. Bolt 1/4-20 x .5 ” 5 04019-02 Nut, Serr. Flg. 1/4-20 6 04010-01 Screw, #10-32 x .5, Phillips Head 7 04031-01 Lock Washer, #10 8 04020-01 Nut, #10-32 9 451080 Weldment, Pump Mounting 10 43506 Spacer, Engine 11 43507 Stud, Anti-Rotation 12 451084 Rod,[...]

44 RADIA T OR, COOLERS & ENGINE BRACKETS T O "A" A A TT ACHES TO FRAME 17 22 21 12 13 15 2 9 1 5 11 10 10 6 7 20 19 14 14 3 18 16 16 8 23 24 25 26 27 28 29 30 31 32 34 35 26 26 36 37 26 26 37 38 39 40 36 26 41 42 43 42 44 45 33 4[...]

45 1 481810 Radiator 2 481742 Hose, Upper Radiator 3 481743 Hose, Lower Radiator 4 04030-03 Lockwasher, 5/16 (.317 x .586 x .078) Helical Spring 5 422701 Bracket, Air Cleaner 6 422697 Bracket, Engine Mounting LH 7 422698 Bracket, Engine Mounting RH 8 422702 Bracket, Radiator Mounting 9 422704 Shroud, Radiator 10 422696 Plate, Engine Mounting 11 481[...]

46 STT99B&SC BRAKE AND STEERING COMPONENTS A A 1 2 8 11 33 13 17 20 12 14 19 23 41 11 21 34 36 57 73 48 47 46 5 23 53 42 43 44 45 15 56 70 69 68 71 62 15 65 63 60 64 67 60 52 41 34 23 51 22 50 61 59 9 22 34 35 TO RH PUMP TO LH PUMP 37 36 27 28 35 33 3 34 31 30 29 10 9 6 32 7 13 B 24 9 B 25 18 72 49 55 54 16 5 3 4 75 26 55 54 74 72 58 76 5 77 66[...]

47 1 481599 Grip, Handle Bar 2 461037 Handle Bar (Includes item 1) 3 04001-32 Bolt, Hex Head 3/8-16 x 1-1/4" 4 04030-04 Lockwasher, 3/8" 5 04041-07 Flatwasher. 3/8" (.391 x .938 x .105) 6 422372 Bar, Control Lever 7 45915 Control Lever 8 04001-17 Bolt, Hex Head 5/16-18 x 2" 9 04021-10 Nut, Hex Elastic Stop 5/16-18 10 04001-45 Bo[...]

48 FUEL AND HYDRAULIC SYSTEM TO ENGINE D To R T. COOLER UPPER PORT To LT. COOLER UPPER PORT F rom RT . COOLER BO TTOM PORT C T O "D" A To A T O "B" T O "C" T O "E" TO CARB. E B F rom L T . COOLER BO TT OM PORT 2001- STTBSG-FHS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 18 19 20 21 21 18 18 17 19 19 19 22 22[...]

49 1 481919 Hose, Oil Pressure Sender 2 481811 Oil Pressure Sender 3 481813 Oil Manifold 4 481812 Switch, Low Oil Pressure 5 04001-03 Bolt, Hex Head 1/4-20 x 2” 6 461090 Gas Damper (includes items 7 & 10) 7 481357 Spring Clip 8 422826 Clamp Plate, Pump Control 9 04021-04 Locknut, 5/16-18 CTR 10 481356 Ball Stud 11 481793 Block, Pump Control 1[...]

50 ELECTRICAL SYSTEM B A C C B A 1 2 3 4 5 6 7 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 22 21 20 20 20 24 25 24 25 24 25 26 22 21 22 21 27 27 1 2 19 28 29 30 31 32 33 34 35 36 36 37 D D 19 38 ELECTRICAL SYSTEM[...]

51 1 481176-04 Cable, Positive Battery 2 481176-03 Cable, Negative Battery 3 461399 Clutch, Electric PTO 4 481808 Module, Interlock 5 481786 Battery 6 481687 Switch, PTO 7 48798 Switch, Key (Includes Nut and Lockwasher) 48017-03 Nut, 5/8-32 Special 48017-04 Lock Washer 5/8” 8 481806 Cable, Control (Throttle, Choke) 9 481638 Switch, Seat 10 481183[...]

52 HYDRAULIC PUMP ASSEMBLY STT 2K BDP-21 11 4 9 11 2 12 10 6 8 7 18 5 14 17 19 20 22 21 23 24 16 25 26 28 27 3 Overhaul Seal Kit 1 3 25 13 15 HYDRAULIC PUMP ASSEMBL Y - BDP-21L[...]

53 1 HG 2510065 Housing Kit (Includes Housing, Journal Bearing) 2 HG 2510066 End Cap 3 HG 50641 Straight Headless Pin 4 HG 50633 Socket Head Screw 5 HG 50381 End Cap Gasket 6 HG 2510071 Charge Pump Kit (Includes Charge Cover, Gerotor Assy., O-Ring) 7 HG 50406 Gerotor Assembly 8 HG 9004100-1430 O-Ring 9 HG 70402 Charge Relief Valve Kit 10 HG 9007200[...]

54 RED RED BLUE BLK RED RED PINK ORG BRN PINK RED RED BLUE BLK RED RED RED ORG L T BLUE BRN L T BLUE WHITE W/RED GRN W/BLK GRN W/WHITE GRN RED RED BLK BLK RED RED RED RED RED RED ORG BRN BLK BLK BLK GRN W/WHITE WHITE W/BLK BLK W/ WHITE BLK YEL YEL INTERLOCK MODULE PTO SWITCH VO LT METER IGNITION SWITCH OIL PRESSURE GA UGE W A TER TEMP GA UGE 20 AMP[...]

55 REPLACEMENT DECALS AND INFORMA TION PLA TES 482285 482286 48320 - 61" 48327 - 72" 481955 - 61A 481956 - 71A 48656 48404 481568 482290 481039 481348 481543 482287 481971 CHOKE SLOW F AST R 481348 WARNING INSTALL BELT COVER BEFORE OPERATING MACHINE READ OPERATOR'S MANUAL 481039 CUTTING HEIGHT 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 481543 F[...]

56 REPLACEMENT DECALS AND INFORMA TION PLA TES 481921 IMPORT ANT ADJUSTMENT PROCEDURES READ OPERA TOR'S MANU AL FOR MORE DET AILS NEUTRAL ADJUSTMENT TRACKING ADJUSTMENT FREE WHEEL OPERA TION HYDRAULIC T ANK FLUID LEVEL Check tire pressure- (Drive tires - 12 psi, Caster tires -25 psi) T o move machine without running the engine, rotate both dum[...]

Any part of the Scag commercial mower manufactured by Scag Power Equipment and found, in the reasonable judgment of Scag, to be defective in materials or workmanship, will be repaired or replaced by an Authorized Scag Service Dealer without char ge for parts and labor . This warranty is limited to the original purchaser and is not transferable. Pro[...]

P ART NO. 03093 PRINTED 1 1/00 PRINTED IN USA © 2000 SCAG POWER EQUIPMENT DIVISION OF MET ALCRAFT OF MA YVILLE, INC.[...]