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OPERATOR’S MANUAL
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.
© 2003 PART NO. 03133
SCAG POWER EQUIPMENT PRINTED 7/03
DIVISION OF MET
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WARNING: FAILURE TO FOLLOW SAFE OPERATING PRACTICES MAY RESULT 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 wire and ignition key. * If a mechanism becomes clogged, stop the engine before cleaning. * Keep hands, feet and clothing away from power-driven parts. * Read this manual completely as well as other manuals that came with your mower. * Keep others
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TABLE OF CONTENTS MODEL STHM SUBJECT PAGE Introduction .................................................................................................. 1 General Safety Instructions.......................................................................... 1 Signal Words ............................................................................................... 1 Symbols....................................................................................................... 2-3 Before Operati
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TABLE OF CONTENTS (CONTINUED) SUBJECT PAGE Illustrated Parts List SM 61A, 72A Cutter Deck...................................................................... .. 20-21 Engine Deck ..................................................................................... 22-23 Upper Hydraulics .............................................................................. 24-25 Lower Hydraulics........................................................................................ 26-27 Control Linkag
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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!". The symbol is used We encourage you to contact your dealer for repairs. with the following signal words to attract your All Scag dealers are informed of the latest methods att
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ISO Symbols CE Mark SYMBOL DESCRIPTION SYMBOL DESCRIPTION Choke Transmission Parking Brake Spinning Blade 48071S On/Start Spring Tension on Idler Off/Stop Oil WARNING Falling Hazard FALLING HAZARD USE ONLY SCAG APPROVED RIDING ATTACHMENTS 481109 SEE OPERATOR'S MANUAL 2
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SYMBOL DESCRIPTION SYMBOL DESCRIPTION Slow Fast Cutting Element - Basic Symbol Continuously Variable - Linear Pinch Point Cutting Element - Engage 481039S Hourmeter/Elapsed Operating Hours Cutting Element - Disengage Read Operator's Manual Thown Object Hazard Keep Bystanders Away 3
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BEFORE OPERATING WHILE OPERATING 1. Know the operating controls and how to stop 1. Start the engine when the cutter blades are quickly. disengaged, the parking brake is on and the right foot pedal is in the neutral position. 2. Do not allow children to operate the machine. Do not allow adults to operate the machine 2. Do not run the engine in a confined area without without proper instruction. adequate ventilation. Exhaust fumes are hazard- ous and could possibly be deadly. 3. Remove all debris
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MAINTENANCE AND STORAGE 9. If the cutting blades should strike a solid object or the equipment should start to vibrate abnor- 1. Disconnect the spark plug wire from the spark mally, stop the engine, disconnect the spark plug wires, and check immediately for the cause. Vibra- plug to prevent accidental starting of the engine when servicing, adjusting or storing the machine. tion is generally a warning of trouble. Check the machine for damaged or defective parts. Repair any 2. If the mower must
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9. Always store gasoline in a safety-approved, red MOWER OPERATION container. 1. Read and understand the safety instructions before attempting to operate this machine. 10. Be careful when servicing the battery as it con- tains acid, which is corrosive and could cause 2. Before starting the engine: burns to skin and clothing. * Check the oil level in the engine and the 11. Batteries release explosive gases when being hydraulic reservoir. charged or discharged. Keep batteries away from * Fill the
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-NOTE- When the PTO is engaged or (possibly) disen- gaged, a squealing sound from the underside of the machine is normal. It is caused by the electric clutch plates meshing as the cutter blades come up to speed. For best equipment life, engage the clutch with the engine at 3/4 throttle, not under full load. SGB003 WARNING: Backward (Reverse) Operation - Depress Heel If you are not familiar with the operation of the End of Pedal hydrostatic drive, practice turning and Figure 2 maneuvering befor
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If the drive wheels consistently rotate when foot ADJUSTMENTS pedal control is in neutral, go to step 4. PARKING BRAKE Minor brake adjustments can be made by loosening If the drive wheels inconsistently rotate, i.e. drive the top nut on both brake cables (see Figure 4). wheels sometimes rotate and sometimes do not Back the nuts off approximately 1/4". While pulling when foot pedal is not depressed, then check one cable downward, tighten the bottom nut on the neutral adjustment bolt for "zero fre
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2. To adjust cutter deck drive belt: Adjust the nut so 5. Check the adjustment of the right foot control pedal that the belt moves 1/2" with 10 pounds of pres- for full forward speed. The pedal should rest on the sure. (See Figure 7). foot plate when the pump is stroked in the full forward position. To make an adjustment, discon- "J" Bolt End Of L-Shaped Belt nect the ball joint from the pedal arm and loosen the Bracket Nut jam nut (See Figure 6). Place the foot control pedal forward against
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Adjusting the blade height can be done by moving any Adjust the tension by tightening or loosening number of the five smaller spacers on the blade mount- the nut on the J-bolt. ing bolts to the top or to the bottom of the spindle shaft. Nut All blades should be positioned equally (See Figure 10). Deck "J" Bolt The unit is shipped with one spacer on top of spindle and four underneath (See Figure 10). This adjustment does not affect blade pitch. Washer Hex Nut-Torque Cutter Blade to 75 Lb-Ft Belt
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X There are three positions for mounting the cutter deck CUTTER BLADES (See Figure 11). For cutting in the lowest position, mount the cutter deck in the top hole (A). For cutting in CAUTION: the highest position, mount the deck in the lowest hole (C). Setting the cutter deck height will be determined Blades have a sharp cutting edge. Wear protective gloves or wrap blades with protective material when by the type of cutting conditions. removing, sharpening and installing blades. A Angle Blade
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A. 3" Position - baffle is installed using the top set of 3. Move the Custom-Cut Baffle to desired position. holes on the front baffle welded inside the cutter (See Figures 15through 17 for position). deck. (See Figure 15). The Advantage cutter deck will deliver the best quality-of-cut in very tall, wiry, 4. Reinstall the mounting hardware as shown. (See tough to cut grass. Figures 15 though 17). Torque hardware to 39ft.lbs. TOP SET OF HOLES B. 3-1/2" Position (factory setting) - baffle is ins
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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 & Super Stay-M #2 found at Conoco Service Stations Shell Alvania #2 found at Shell Service Stations 25 Hours Lidok EP #2 found at industrial shops 40 Hours (Weekly) 100 Hours (Biweekly) 200 Hours (Monthly) 500 Hours or An
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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 Width of Deck Belts slipping Adjust belt tensions SGB020 Streaking - Strips of Dull, worn blades Sharpen blades Uncut Grass in Cutting Path Incorrect
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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 Bent spindle area See your authorized SCAG dealer Dull blade Sharpen blade Width of Deck SGB020 Uneven Cut on Uneve
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TROUBLESHOOTING CAUSE CONDITION CURE 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 speed, raise cutting height, and/or change direction of cut Ground speed too fast Slow speed to adjust for conditions Wet gras
