Scag Power Equipment STHM Operator's Manual
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MODEL STHM
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.
© 2005
SCAG POWER EQUIPMENT
DIVISION OF METALCRAFT OF MAYVILLE, INC.
PART NO. 03168
PRINTED 10/05
PRINTED IN USA
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Table of Contents
Troubleshooting
Related Manuals for Scag Power Equipment STHM
Summary of Contents for Scag Power Equipment STHM
- Page 1 MODEL STHM 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 and illustrated parts list for: STHM-23CV with a serial number of B3600001 to B3699999 SM-61V with a serial number of B3700001 to B3799999...
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Page 3: Table Of Contents
TABLE OF CONTENTS MODEL STHM SUBJECT PAGE Introduction ....................1 General Safety Instructions ................1 Signal Words ....................1 Symbols ....................... 2-3 Before Operating ..................4 While Operating ................... 5-6 Maintenance and Storage ................6-7 Initial Run-In Procedures ................7 Mower Operation .................. -
Page 4: Table Of Contents
TABLE OF CONTENTS (CONTINUED) SUBJECT PAGE Illustrated Parts List SM 61V, 72A Cutter Deck................. 22-23 Engine Deck ..................24-25 Upper Hydraulics ................26-27 Lower Hydraulics..................28-29 Control Linkage..................30-31 Instrument Panel ................32-33 Rider Frame Assembly ..............34-35 Brake Linkage ................... -
Page 5: Introduction
INTRODUCTION SIGNAL WORDS 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 instruc- tions in this manual. This symbol means “Attention! Become Alert! Your Safety is Involved!". -
Page 6: Symbols
ISO Symbols CE Mark SYMBOL DESCRIPTION SYMBOL DESCRIPTION Choke Transmission Parking Brake Spinning Blade 48071S On/Start Spring Tension on Idler Off/Stop Thown Object Hazard Falling Hazard WARNING FALLING HAZARD USE ONLY SCAG APPROVED RIDING ATTACHMENTS SEE OPERATOR'S MANUAL 481109... - Page 7 SYMBOL DESCRIPTION SYMBOL DESCRIPTION Slow Fast Cutting Element - Basic Symbol Continuously Variable - Linear Cutting Element - Engage Pinch Point 481039S Hourmeter/Elapsed Operating Hours Cutting Element - Disengage Read Operator's Manual Thown Object Hazard Keep Bystanders Away...
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Page 8: Before Operating
Attachments and accessories manufactured by there is an open flame , spark or pilot light such as companies other than Scag Power Equipment are not on a water heater or other appliances. approved for use on this machine. Scag approved attachments and accessories: F. -
Page 9: While Operating
WHILE OPERATING 10. Keep hands and feet away from cutting units. 11. Shut the engine off and wait until the blades come 1. Start the engine when the cutter blades are disen- to a complete stop before removing the grass gaged, the parking brake is on and the right foot catcher container. -
Page 10: Maintenance And Storage
7. Be sure the machine is in safe operating condition by 18. Before leaving the operator’s position or leaving keeping nuts, bolts, and screws tight. Check the the mower unattended, move the right foot pedal blade mounting bolts and nuts frequently to be sure into the neutral position, apply the parking brake, they are tightened. -
Page 11: Initial Run-In Procedures
WARNING: Hydraulic fluid is under high pressure. Keep body and hands away from pinholes or nozzles that eject hydraulic fluid under high pressure. If you need service on your hydraulic system, please see your authorized Scag dealer. If hydraulic fluid is injected into the skin, it must be surgically removed within a few hours by a doctor or gangrene may result. -
Page 12: Mower Operation
MOWER OPERATION -NOTE- When the PTO is engaged or (possibly) disen- 1. Read and understand the safety instructions gaged, a squealing sound from the underside of before attempting to operate this machine. the machine is normal. It is caused by the electric clutch plates meshing as the cutter 2. -
Page 13: Parking Brake Adjustments
ADJUSTMENTS PARKING BRAKE Minor brake adjustments can be made by loosening the top nut on both brake cables (see Figure 4). Back the nuts off approximately 1/4". While pulling one cable downward, tighten the bottom nut on the cable until it touches the bottom of the brake cable mount. -
Page 14: Belt Tension
If the drive wheels consistently rotate when foot 5. Check the adjustment of the right foot control pedal pedal control is in neutral, go to step 4. for full forward speed. The pedal should rest on the foot plate when the pump is stroked in the full If the drive wheels inconsistently rotate, i.e. -
Page 15: Belt Tension
2. To adjust cutter deck drive belt: Adjust the nut so Adjust the tension by tightening or loosening that the belt moves 1/2" with 10 pounds of pres- the nut on the J-bolt. (See Figure 9). sure. (See Figure 7). Deck End Of L-Shaped "J"... - Page 16 There are three positions for mounting the cutter deck Adjusting the blade height can be done by moving any (See Figure 11). For cutting in the lowest position, number of the five smaller spacers on the blade mount- mount the cutter deck in the top hole (A). For cutting ing bolts to the top or to the bottom of the spindle shaft.
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Page 17: Cutter Blades
CUTTER BLADES A. 3" Position - baffle is installed using the top set of holes on the front baffle welded inside the cutter deck. (See Figure 15). The Advantage cutter deck CAUTION: will deliver the best quality-of-cut in very tall, wiry, tough to cut grass. - Page 18 3. Move the Custom-Cut Baffle to desired position. (See Figures 15 through 17 for position). 4. Reinstall the mounting hardware as shown. (See Figures 15 though 17). Torque hardware to 39ft.lbs. TOP SET OF HOLES CARRIAGE BOLT FOR 3" SETTING 2004 CCB - 3"...
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Page 19: Lubrication And Maintenance
LUBRICATION & MAINTENANCE * Lubrication may be required every 8 to 40 hours, depending on climate and environment. Break-In + Compatible Greases: Mobilux #2 found at Mobil Service Stations (1st 10 Hours) Ronex MP found at Exxon Service Stations 8 Hours (Daily) Super Lube MEP #2 &... -
Page 20: Troubleshooting Cutting Conditions
TROUBLESHOOTING CUTTING CONDITIONS CAUSE CURE CONDITION Stringers - Occasional Low engine RPM Run engine at full 3600 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... -
Page 21: Troubleshooting
TROUBLESHOOTING CAUSE CURE CONDITION Uneven Cut on Flat Lift worn off of 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 SCAG dealer... - Page 22 TROUBLESHOOTING CAUSE CURE CONDITION 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...
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Page 23: Technical Specifications
TECHNICAL SPECIFICATIONS ENGINES General Type: Heavy duty industrial/commercial Brand: Kohler 23 HP Pro Series (Spec PS-75523) Models: CV23S Horsepower: 23HP @ 3600 RPM Type: 4 cycle gas, twin cylinder, vertical shaft engine Displacement: 23HP = 674 cc Cylinders: 2 cast-iron sleeves Governor: Mechanical type governor with variable speed control set at 3600 rpm (+50 rpm), idle set at 1900 rpm (+100rpm) -
Page 24: Technical Specifications
TECHNICAL SPECIFICATIONS (CON'T) CUTTER DECKS SM61V, SM 72A 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 Cutting Width: 61.0 " (155.0 cm), 71.5" (181.6 cm) Cutting Height Adjustment: Adjustable from 1-3/4"... -
Page 25: Notes
NOTES... -
Page 26: Sm 61V, 72A Cutter Deck
SM-61V & SM-72A CUTTER DECK 27 28 STHM2006CD... - Page 27 SM-61V & SM-72A CUTTER DECK Ref. Part Ref. Part No. No.Description 61 72 No. No. Description 61 72 04019-03 Nut, 5/16-18 Ser. Flange 461861 Cutter Deck, Velocity + (Incl. decals) 04001-77 Bolt, 3/8-16 x 3-1/2" Hex Head 461864 Cutter Deck, Advantage (Incl. decals) 46082 Support Assembly 461846...
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Page 28: Engine Deck
ENGINE DECK SGB010B... -
Page 29: Engine Deck
ENGINE DECK Ref. Part Ref. Part Number Description Number Description 04003-01 Carriage Bolt, 1/4-20 x 6" 04063-08 Key, 1/4 x 1/4 x 2" 04012-04 Hex Socket Set Screw, 5/16-18 x 3/8" 423308 Battery Box 04029-01 Nut, Wing 1/4-20 48792 Pulley, Engine Pump Drive (Incl. 55) 48015 Battery 461397... -
Page 30: Upper Hydraulics
UPPER HYDRAULICS SGB027... -
Page 31: Upper Hydraulics
UPPER HYDRAULICS Ref. Part Number 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 32: Lower Hydraulics
LOWER HYDRAULICS LOWER HYDRAULICS... - Page 33 LOWER HYDRAULICS Ref. Part Number Description 04017-04 Capscrew, 1/4-20 x1/2 Serr. Fl. Hex Head 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 Hose Clamp 48482...
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Page 34: Control Linkage
CONTROL LINKAGE CONTROL LINKAGE sgb011... -
Page 35: Control Linkage
CONTROL LINKAGE Ref. Part Number Description 46328 Control Linkage, Bellcrank (Includes 30, 31) 04040-15 Flatwasher, 5/16 (.375 x .875 x .083) 04001-13 Bolt, Hex Head 5/16-18 x 2-3/4" 04001-19 Bolt, Hex Head 3/8-16 x 1" 04040-05 Flatwasher, 3/8 (.406 x .812 x .065) 43212 Sleeve, Pump Control Link 42658... -
Page 36: Instrument Panel
INSTRUMENT PANEL AND ELECTRICAL COMPONENTS INSTRUMENT PANEL AND ELECTRICAL COMPONENTS PTO Switch Connector STHM99IP&E... - Page 37 Serr. Fl. HH Nut, 5/16-18 482700 Battery (Not sold through Scag) 04001-44 Bolt, Hex head 1/4-20 x 1/2" 04020-02 Hex Nut 1/4-20 481683 Wire Harness, STHM 04031-09 Lockwasher 5/16 Int. Tooth 481776 Engine, 23 HP Kohler CV(Spec PS-75523) 481474 Switch, Parking Brake 481476...
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Page 38: Rider Frame Assembly
RIDER FRAME ASSEMBLY RIDER FRAME ASSEMBLY 67,68 37 A STHM99RFA... -
Page 39: Rider Frame Assembly
RIDER FRAME ASSEMBLY Ref. Part Ref. Part Number Description Number Description 46715 Steering Frame (includes Bshgs and Fittings) 481894 Rim Only 48100-01 Bronze Bushing, 7/8 ID x 1.0 Flanged 48005 Rear Wheel Assy. (includes items 33-36, 37A) 04050-03 Retaining Ring, 7/8 external 481893 Tire Only 04021-10... -
Page 40: Brake Linkage
BRAKE LINKAGE Deck Weldment SGB050... -
Page 41: Brake Linkage
BRAKE LINKAGE Ref. Part Number Description 04019-04 Serr. Fl. HH Nut, 3/8-16 04021-05 Hex Locknut, 3/8-16 43032 Swivel 04062-01 Hairpin Cotter (.094 x 1.62) 04001-32 Hex Head Bolt, 3/8-16 x 1-1/4" 43212 Sleeve, Hydro Linkage 421338 Link, Cam 48342 Grip, Parking Brake 45504 Handle, Parking Brake 04041-07... -
Page 42: Eletrical System
ELECTRICAL WIRING HARNESS 481683 MOWER CLUTCH NEGATIVE POSITIVE HOURMETER HOURMETER ENGINE GND BLACK BLACK BRAKE INTERLOCK BLACK FUSES FOOT PEDAL INTERLOCK BLACK SWITCH GREEN YELLOW POSITIVE NEGATIVE AMMETER AMMETER TO ENGINE MOWER ENGAGEMENT 481683 PTO SWITCH CONNECTOR STARTER SOLENOID WIRE HARNESS WITH RELAY PART NO. -
Page 43: Winch Lift System
WINCH LIFT SYSTEM Steering Frame sgb008 Ref. Part Ref. Part Number Description Number Description 48043 Winch Assembly (Incl. 1-7, 11-13, 15-23) 48044 Winch Handle 204803 Locknut, 7/16-14 205015 Handle Nut 404409 Ratchet Pawl 204364 Handle Spring 205167 Ratchet Bolt 208328 Shaft Bushing 404163 Pressure Washer... -
Page 44: Replacement Decals
REPLACEMENT DECALS & INFORMATION 2, 2a, 2b 10, 11 Ref. Part Ref. Part Number Description Number Description 482289 Decal, Instrument Panel 481971 Decal, Heavy Duty Commercial 481039 Decal, Warning-Belt Cover 48314 Decal, Scag Logo ( Cutter Deck) 48993 Decal, Dump Valve 48968 Decal, Scag Logo (Battery Box Front) 48404... - Page 45 (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. This warranty does not cover any mower that has been subject to misuse, neglect, negligence, or accident, or that has been operated in any way contrary to the operating instructions as specified in the Operator’s Manual.