Scag Power Equipment STHM-23GV Operator's Manual
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Scag Power Equipment STHM-23GV Operator's Manual

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Congratulations on owning a Scag mower! This manual contains the operating
instructions and safety information for your Scag mower. Reading this manual
can provide you with assistance in maintenance and adjustment procedures to
keep your mower performing to maximum efficiency. The specific models that
this book covers are listed on the inside cover. Before operating your machine,
please read all the information enclosed.
© 2008
Scag Power Equipment
Division of Metalcraft of Mayville, Inc.
OPERATOR'S
MANUAL
STHM
Model:
STHM-23CV
PART NO. 03223 Rev. 1
PRINTED 3/2008
PRINTED IN USA

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Summary of Contents for Scag Power Equipment STHM-23GV

  • Page 1 Before operating your machine, please read all the information enclosed. © 2008 PART NO. 03223 Rev. 1 Scag Power Equipment PRINTED 3/2008 Division of Metalcraft of Mayville, Inc. PRINTED IN USA...
  • Page 2 WARNING FAILURE TO FOLLOW SAFE OPERATING PRACTICES MAY RESULT IN SERIOUS INJURY OR DEATH. • Read this manual completely as well as other manuals that came with your mower. • DO NOT operate on steep slopes. To check a slope, attempt to back up it (with the cutter deck down).

  • Page 3: Table Of Contents

    Table of Contents TABLE OF CONTENTS SECTION 1 - GENERAL INFORMATION ...................1 1.1 INTRODUCTION ............................1 1.2 DIRECTION REFERENCE ...........................1 1.3 SERvICING THE ENGINE AND DRIvE TRAIN COMPONENTS ..............1 1.4 SYMBOLS ..............................2 SECTION 2 - SAFETY INFORMATION ..................3 2.1 INTRODUCTION ............................3 2.2 SIGNAL WORDS ............................3 2.3 BEFORE OPERATION CONSIDERATIONS ....................3 2.4 OPERATION CONSIDERATIONS ........................4...
  • Page 4 Table of Contents SECTION 6 - ADJUSTMENTS ....................19 6.1 PARkING BRAkE ADJUSTMENT ......................19 6.2 NEUTRAL ADJUSTMENT .........................19 6.3 THROTTLE CONTROL AND CHOkE ADJUSTMENTS ................20 6.4 BELT ADJUSTMENT ..........................20 6.5 BELT ALIGNMENT .............................21 6.6 CUTTER DECk ADJUSTMENTS ......................21 6.7 CUSTOM-CUT BAFFLE ADJUSTMENT ....................23 SECTION 7 - MAINTENANCE ....................25...

  • Page 5: General Information

    Scag service parts. All information is based upon product information available - IMPORTANT - at the time of approval for printing. Scag Power Equipment The replacement of any part on this product reserves the right to make changes at any time without by other than the manufacturer's authorized notice and without incurring any obligation.

  • Page 6: Symbols

    Section 1 SYMBOLS SYMBOL DESCRIPTION SYMBOL DESCRIPTION Choke Transmission Parking Brake Spinning Blade 48071S On/Start Spring Tension on Idler Off/Stop Falling Hazard Thrown Object Hazard Fast Slow Continuously Variable - Linear Cutting Element - Basic Symbol Pinch Point Cutting Element - Engage 481039S Hour meter/Elapsed Operating Hours Cutting Element - Disengage...

  • Page 7: Safety Information

    Section 2 SAFETY INFORMATION INTRODUCTION DANGER Your mower is only as safe as the operator. Carelessness or operator error may result in serious bodily injury The signal word “DANGER” denotes that an extremely or death. Hazard control and accident prevention are hazardous situation exists on or near the machine that dependent upon the awareness, concern, prudence, and could result in high probability of death or irreparable...

  • Page 8: Operation Considerations

    Section 2 If the operator(s) or mechanic(s) cannot read English DO NOT add fuel to a running or hot engine. Allow or Spanish, it is the owner's responsibility to explain the engine to cool for several minutes before adding this material to them. fuel.
  • Page 9 Section 2 To prevent tipping or loss of control, start and stop The machine and attachments should be stopped smoothly, avoid unnecessary turns and travel at and inspected for damage after striking a foreign reduced speed. object, and damage should be repaired before restarting and operating the machine.

  • Page 10: Maintenance Considerations & Storage

    Section 2 MAINTENANCE CONSIDERATIONS & WARNING STORAGE Never make adjustments to the machine with the Hydraulic fluid is under high pressure. keep body engine running unless specifically instructed to do and hands away from pinholes or nozzles that so. If the engine is running, keep hands, feet, and clothing away from moving parts.

  • Page 11: Safety And Instructional Decals

    Section 2 SAFETY AND INSTRUCTIONAL DECALS WARNING WARNING INSTALL BELT COvER BEFORE OPERATING MACHINE DO NOT OPERATE WITHOUT DISCHARGE CHUTE, MULCHING kIT, OR ENTIRE GRASS CATCHER INSTALLED READ OPERATOR'S MANUAL 483402 483405 483402 483405 WARNING ROTATING BLADES AND BELTS SPINNING BLADES * keep hands, feet &...

  • Page 12: Specifications

    Section 3 SPECIFICATIONS ENGINE General Type ....................Heavy Duty Industrial/Commercial Gasoline Brand ......................Kohler 23 Hp Pro Series (Spec PS-75523) Horsepower ............................23hp @ 3600 Rpm Type ......................4 Cycle Gasoline, Twin Cylinder, Vertical Shaft Cylinders ............................. 2 with Cast Iron Sleeves Displacement ................................674 cc Valve ..........................

  • Page 13: Cutter Deck

    Section 3 Travel Speed: Forward ................................0-6.8 mph Reverse ................................0-5.4 mph -Note- The machine will travel at 6.8 mph for transport purposes. For best cutting performance the forward travel speed should be adjusted depending upon the cutting conditions. CUTTER DECk Type ........Out-Front Design with Anti-Scalp Roller and Pneumatic Shock Absorber For Deck Flotation Construction ............10-Gauge Steel with 7-Gauge (3/16") Steel Skirt.

  • Page 14: Operating Instructions

    Section 4 OPERATING INSTRUCTIONS Engine Choke Control (Figure 4-1). Used to start CAUTION a cold engine. Fuel Shutoff valve (Figure 4-1). Located on the bottom of the fuel tank. Used to shut off fuel supply Do not attempt to operate this mower unless you to the engine.

  • Page 15: Safety Interlock System

    Section 4 SAFETY INTERLOCk SYSTEM STARTING THE ENGINE WARNING CAUTION Never operate the mower with the interlock DO NOT USE STARTING FLUIDS. Use of starting system disconnected or malfunctioning. Do not fluids in the air intake system may be potentially disengage or bypass any switch;...

  • Page 16: Ground Travel

    Section 4 GROUND TRAvEL - IMPORTANT - When driving over curbs, disengage the cutter blades and raise the cutter deck to clear the curb. - IMPORTANT - Drive forward over the curb. After the curb is clear, If you are not familiar with the operation of this lower the cutter deck back to normal operating machine, the steering and ground speed operations position.

  • Page 17: Engaging The Deck Drive (Cutter Blades)

    Section 4 - 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. To disengage the deck drive, push the switch in to the disengage position.

  • Page 18: Parking The Mower

    Section 4 PARkING THE MOWER 4.10 REMOvING CLOGGED MATERIAL Park the machine on a flat, level surface only. Do not park the machine on an incline. DANGER Place the drive pedal in the neutral position. Disengage the cutter blades. ROTATING BLADES Slow the engine to idle speed.

  • Page 19: Recommendations For Mowing

    Section 4 - NOTe - 4.13 TOWING (OPTIONAL HITCH ACCESSORY) To prevent damage to the hydraulic system, do not exceed 1MPH when moving the machine in NEVER allow children or others in or on towed the freewheel position. equipment. Tow only with a machine that has a hitch designed 4.12 RECOMMENDATIONS FOR MOWING for towing.

  • Page 20: Troubleshooting Cutting Conditions

    Section 5 TROUBLESHOOTING CUTTING CONDITIONS CONDITION CAUSE CURE 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...
  • Page 21 Section 5 TROUBLESHOOTING CUTTING CONDITIONS (CONT'D) CONDITION CAUSE CURE U N E v E N C U T O N F L AT Lift worn from blade Replace blade GROUND - WAvY HIGH-LOW APPEARANCE, SCALLOPED Blade upside down Mount with cutting edge toward ground CUT, OR ROUGH CONTOUR Deck plugged, grass accumulation Clean underside of deck...
  • Page 22 Section 5 TROUBLESHOOTING CUTTING CONDITIONS (CONT'D) CONDITION CAUSE CURE SCALPING - BLADES HITTING Low tire pressures Check and adjust pressures DIRT OR CUTTING vERY CLOSE TO THE GROUND Ground speed too fast Slow speed to adjust for conditions May need to reduce ground speed, raise Cutting too low cutting height, change direction of cut, and/or change pitch and level...

  • Page 23: Adjustments

    Section 6 ADJUSTMENTS PARkING BRAkE ADJUSTMENT Tighten both the top and bottom nuts to lock the cable in place. Repeat the above steps for the second brake cable. WARNING Make sure that both cables are adjusted evenly so that the brakes do not cause the mower to pull to the left or right.

  • Page 24: Throttle Control And Choke Adjustments

    Section 6 THROTTLE CONTROL AND CHOkE ADJUSTMENTS These adjustments must be performed by your Scag dealer to ensure proper and efficient running of the engine. Should either need adjustment, contact your authorized Scag service center. BELT ADJUSTMENT WARNING Neutral Control Before removing any guards, shut the engine off Spring and remove the ignition key.

  • Page 25: Belt Alignment

    Section 6 To adjust blade drive belt: BELT ALIGNMENT A. Using a belt tension gauge, check the belt tension Belt alignment is important for proper performance of so that the belt moves 1/2" with 10 pounds of pressure. your Scag mower. If you experience frequent belt wear See Figure 6-5.
  • Page 26 Section 6 HEx NUT-TORqUE TO 75 LB-FT CUTTER BLADE SPACER 1/4" SPINDLE CUTTER SHAFT DECk HEx HEAD BOLT / NUT SPINDLE ASSEMBLY SGB032 CUTTER BLADE Figure 6-8. Cutter Deck Height Adjustment SPACERS 1/4" Caster spacers also can be repositioned to change the cutting heights and to change the pitch of the deck.

  • Page 27: Custom-Cut Baffle Adjustment

    Section 6 7-POSITION CUSTOM-CUT BAFFLE CUSTOM-CUT BAFFLE ADJUSTMENT ADJUSTMENT The Custom-Cut Baffle is designed to deliver optimum airflow and superior cutting performance in any type of A. 3-1/2" or 3-3/4" Position - (See Figure 6-11). For grass. The Custom-Cut Baffle can be raised or lowered very tall, wiry or tough-to-cut grass.
  • Page 28 Section 6 Custom-Cut Baffle Adjustment Mounting Slot Mounting Hardware Location Slot “A” Hole 1 Hole 2 Hole 3 Height (inches) 3” 3-1/2” 4” Figure 6-10. 3-Position Custom-Cut Baffle Adjustment Custom-Cut Baffle Adjustment Mounting Slot Selected Mounting Hardware Location Slot “A” Hole 1 Hole 2 Hole 3...

  • Page 29: Maintenance

    Section 7 MAINTENANCE MAINTENANCE CHART - RECOMMENDED SERvICE INTERvALS HOURS PROCEDURE COMMENTS BREAk-IN (FIRST 10) C h e c k a l l h a r d w a r e f o r tightness Check hydraulic oil level See paragraph 7.3 Check all belts for proper See paragraph 7.7 alignment...

  • Page 30: Lubrication

    Section 7 MAINTENANCE CHART - RECOMMENDED SERvICE INTERvALS (CONT'D) HOURS PROCEDURE COMMENTS BREAk-IN (FIRST 10) Apply grease to fittings See paragraph 7.2 Check hardware for tightness Change engine oil filter See paragraph 7.4 Check hydraulic oil level See paragraph 7.3 Replace engine fuel filter See paragraph 7.5 Drain hydraulic system and...

  • Page 31: Hydraulic System

    Section 7 HYDRAULIC SYSTEM Hydraulic Oil Reservoir 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.

  • Page 32: Engine Oil

    Section 7 ENGINE OIL ENGINE FUEL SYSTEM DANGER ENGINE OIL ENGINE OIL FILLER DRAIN PLUG To avoid injury from burns, allow the mower ENGINE OIL to cool before removing the fuel tank cap and FILTER refueling. A. FILLING THE FUEL TANk Fill the fuel tank at the beginning of each operating day to within one (1) inch below the filler neck.

  • Page 33: Engine Air Cleaner

    Section 7 Replace gas cap and tighten securely. ENGINE AIR CLEANER B. REPLACING IN-LINE FUEL FILTER A. CLEANING AND/OR REPLACING AIR ELEMENTS CLEANER ELEMENT The engine fuel filter should be replaced after every 500 For any air cleaner, the operating environment dictates hours of operation or annually, whichever occurs first.

  • Page 34: Battery

    Section 7 B. CHARGING THE BATTERY BATTERY Refer to the battery charger’s manual for specific instructions. WARNING Under normal conditions the engine’s alternator will have no problem keeping a charge on the battery. If the battery Lead-acid batteries produce flammable and has been completely discharged for a long period of time, explosive gases.

  • Page 35: Cutter Blades

    Section 7 CUTTER BLADES Angle Blade Back Do Not Cut In A. BLADE INSPECTION Remove the ignition key before servicing the blades. Raise the mower deck to the highest position. Place X Must NOT Exceed the lanyard pin in the highest cutting height position 1/3 Blade Width to prevent the cutter deck from falling.

  • Page 36: Tires

    Section 7 7.11 BODY, DECk, AND UPHOLSTERY HEX NUT-TORQUE TO 75 LB-FT Keep the entire mower clean to inhibit serious heat damage to the engine or hydraulic oil circuit. SPINDLE CAUTION SHAFT CUTTER DECK Do not wash any portion of the equipment while it is hot.

  • Page 37: Illustrated Parts List

    Section 8 ILLUSTRATED PARTS LIST SCAG APPROvED ATTACHMENTS AND ACCESSORIES Attachments and accessories manufactured by companies other than Scag Power Equipment are not approved for use on this machine. Scag approved attachments and accessories: • Mulch Plate (p/n 9288, 9262) •...

  • Page 38: Sm-61V & Sm-72A Cutter Deck

    Section 8 SM-61v & SM-72A CUTTER DECk 27 28 STHM2006CD...
  • Page 39 Section 8 SM-61v & SM-72A CUTTER DECk Ref. Ref. Part No. Description 61 72 Part No. Description 61 72 43028 J-Rod Idler Pulley 461861 Cutter Deck, Velocity w/Decals 44078 J-Rod Idler Pulley 461864 Cutter Deck, Advantage w/Decals 04001-175 Bolt, Hex Hd. 5/16-18 x 1-1/2" 461846 Discharge Chute, Velocity Plus Grd 8...

  • Page 40: Engine Deck

    Section 8 ENGINE DECk STHM2008ED...
  • Page 41 Section 8 ENGINE DECk Ref. Ref. Part No. Description Part No. Description 48792 Pulley, Engine Pump Drive (Incl. 55) 04003-01 Carriage Bolt, 1/4-20 x 6" 461397 Clutch, Electric (Ogura) 423308 Battery Box 04041-28 Flatwasher, 7/16 (.469 x 1.75 x .25") 04029-01 Nut, Wing 1/4-20 04030-05...

  • Page 42: Upper Hydraulics

    Section 8 UPPER HYDRAULICS SGB027...
  • Page 43 Section 8 UPPER HYDRAULICS Ref. Part No. Description 48711 Tank, Hydraulic 481164 Cap, Hydraulic Tank 48634 Hose, Pump to Oil Cooler 48942 Hose, Oil Cooler to Tank 48136-04 Clamp, Hose 48936-01 Coupling, Flare Swivel 48572-05 Tube, Union 48645 Oil Cooler Assembly 04003-12 Carriage Bolt, 5/16-18 x 3/4"...

  • Page 44: Lower Hydraulics

    Section 8 LOWER HYDRAULICS...

  • Page 45: Lower Hydraulics

    Section 8 LOWER HYDRAULICS Ref. Part No. Description 04017-04 Serr. Flng. Hex Hd. Capscrew, 1/4-20 x 1/2" 48462-02 Filter Head 48758 Filter, Spin-On Lube 48991 Hose Assembly 48688 Hose Assembly 48350-03 Elbow, 90 Degrees 04062-01 Hairpin Cotter 44088 Lever, Dump Valve 48353-02 Connector, Flare Swivel with Hose Barb 48136-04...

  • Page 46: Control Linkage

    Section 8 CONTROL LINkAGE sgb011...
  • Page 47 Section 8 CONTROL LINkAGE Ref. Part No. Description 46328 Control Linkage, Bellcrank (Includes 30, 31) 04040-15 Flatwasher, 5/16 (.375 x .875 x .083") 04001-13 Bolt, Hex Hd. 5/16-18 x 2-3/4" 04001-19 Bolt, Hex Hd. 3/8-16 x 1" 04040-05 Flatwasher, 3/8 (.406 x .812 x .065") 43212 Sleeve, Pump Control Link 42658...

  • Page 48: Instrument Panel And Electrical Components

    Section 8 INSTRUMENT PANEL AND ELECTRICAL COMPONENTS PTO Switch Connector STHM2008IP&E...
  • Page 49 Section 8 INSTRUMENT PANEL AND ELECTRICAL COMPONENTS Ref. Part No. Description 461360 Instrument Panel w/Decal 48298 Blade Fuse, 20 amp. 482289 Decal, Instrument Panel 48023 Hour Meter (Includes Bracket and Hardware A, B, C) Hour Meter Bracket Lockwasher, #10 Ext. Tooth Hex Nut, 10-24 481755 Ammeter (Includes Bracket and Hardware D, E, F)

  • Page 50: Rider Frame Assembly

    Section 8 RIDER FRAME ASSEMBLY 67,68 37 A STHM2008RFA...
  • Page 51 Section 8 RIDER FRAME ASSEMBLY Ref. Ref. Part No. Description Part No. Description 481894 Rim Only 46715 Steering Frame (Incl. Bushgs and Fittings) 48005 Rear Wheel Assy. (Incl. items 33-36, 37A) 48100-01 Bronze Bushing, 7/8" ID x 1.0" Flanged 04050-03 Retaining Ring, 7/8"...

  • Page 52: Brake Linkage

    Section 8 BRAkE LINkAGE Part of Engine Deck Weldment SGB050...
  • Page 53 Section 8 BRAkE LINkAGE Ref. Part No. Description 04019-04 Serr. Flng. Hex Hd. Nut, 3/8-16 04021-05 Hex Locknut, 3/8-16 43032 Swivel 04062-01 Hairpin Cotter (.094" x 1.62") 04001-32 Hex Hd. Bolt, 3/8-16 x 1-1/4" 43212 Sleeve, Hydro Linkage 421338 Link, Cam 48342 Grip, Parking Brake 45504...

  • Page 54: Winch Lift System

    Section 8 WINCH LIFT SYSTEM Steering Frame sgb008...
  • Page 55 Section 8 WINCH LIFT SYSTEM Ref. Part No. Description 48043 Winch Assembly (Incl. 1-7, 11-13, 15-23) 204803 Locknut, 7/16-14 404409 Ratchet Pawl 205167 Ratchet Bolt 205055 Flatwasher 404166 Ratchet Spacer 204363 Ratchet Spring 42127 Cable Guide 48045 Winch Cable Assembly 04021-03 Hex Locknut, 1/4-28 304753...

  • Page 56: Replacement Decals And Information Plates

    Section 8 REPLACEMENT DECALS AND INFORMATION PLATES Hea vy- Duty Comm e rcial 481971 2, 2a, 2b WARNING ROTATING BLADES AND BELTS SPINNING BLADES * keep hands, feet & clothing clear kEEP CLEAR * keep all guards in place * Shut off engine & disengage blade clutch before servicing BLADE CONTACT &...
  • Page 57 Section 8 REPLACEMENT DECALS AND INFORMATION PLATES Ref. Part No. Description 481971 Decal, Heavy Duty Commercial 48314 Decal, Scag Logo (Cutter Deck) 48968 Decal, Scag Logo (Battery Box Front) 48825 Decal, Scag Logo Seat Back 483407 Decal, Danger-Spinning Blades 483406 Decal, Warning-Rotating Blades 483044 Decal, Patent...

  • Page 58: Electrical Wiring Harness

    Section 8 ELECTRICAL WIRING HARNESS ELECTRICAL WIRING HARNESS 481683 MOWER CLUTCH HOURMETER HOURMETER POSITIVE NEGATIVE ENGINE GND BLACK BLACK BRAKE INTERLOCK BLACK FUSES FOOT PEDAL INTERLOCK BLACK SWITCH GREEN YELLOW AMMETER AMMETER POSITIVE NEGATIVE TO ENGINE MOWER ENGAGEMENT PTO SWITCH CONNECTOR 481683 STARTER SOLENOID...

  • Page 59: Limited Warranty - Commercial Equipment

    Cutter decks are warranted against cracking for a period of three (3) years. (Parts and labor 1st and 2nd year; Parts only 3rd year.) The repair or replacement of the cutter deck will be at the option of Scag Power Equipment.
  • Page 60 © 2008 Scag Power Equipment Division of Metalcraft of Mayville, Inc.

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