Scag Power Equipment STT-31EFI-SS operating instructions Engine Oil, Engine Fuel System

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Section 7

R

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 and properly discard it. See Figure 7-3. Fill the new filter with clean oil and install the filter. Hand tighten only.

2.Run the engine at idle speed with the speed control lever in neutral for five minutes.

3.Check the oil level in the hydraulic tank. It must be 3-1/4" inches from the top of the filler neck. If necessary, add SAE 20W50 motor oil.

7.4 Engine Oil

ENGINE OIL

DIPSTICk

390S0156

Figure 7-4. Engine Oil Fill/Dipstick Location

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.

B. Changing Engine Crankcase Oil

After the first 20 hours of operation, change the engine crankcase oil and replace the oil filter. Thereafter, change the engine crankcase oil after every 100 hours of operation or bi-weekly, whichever occurs first. Refer to the Engine Operator’s Manual furnished with this mower for instructions. See Figure 7-5.

ENGINE OIL FILTER

DRAIN

PLUG

STT99CEC

Figure 7-5. Drain Plug and Oil Filter Location

C. Changing Engine Oil Filter

After the first 20 hours of operation, replace the engine oil filter. Thereafter, replace the oil filter after every 200 hours of operation or every month, whichever occurs first. Refer to Engine Operator’s Manual for instructions. See Figure 7-5.

7.5 Engine Fuel System

DANGER

To avoid injury from burns, allow the mower to cool before removing the fuel tank cap and 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. Do not overfill. Use clean, fresh unleaded gasoline with a minimum octane rating of 87 and a maximum of 10% Ethanol.

DO NOT use E85 Fuel. Using E85 Fuel will cause severe damage to the engine.

To avoid personal injury or property damage, use extreme care in handling gasoline. Gasoline is extremely flammable and the vapors are explosive.

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Contents OPERATOR’S Manual STT61V-31EFI-SS With a serial number E3700001 to E3799999STT-31EFI-SS Table of Contents Following Section AdjustmentsDirection Reference USE only Scag Approved Attachments and AccessoriesGeneral Information IntroductionSymbols Symbol DescriptionSTT Models Signal Word Safety InformationSignal Words This symbol means Attention! Become Alert! YourOperation Considerations Section Foldable Roll-over protection system if equipped Roll-Over Protection SystemFoldable Roll-Over Protection System Using a spark arrestor Maintenance Considerations & StorageSafety And Instructional Decals Install Belt COvER Before Electrical SpecificationsPower Head EngineWeights And Dimensions Cutter DeckHydraulic System Controls And Instrument Identification Operating InstructionsDump Valve Control Safety Interlock SystemForward Travel Initial Run-In ProceduresStarting The Engine Ground Travel And SteeringReverse Travel Engaging The Deck Drive Cutter BladesRemoving Clogged Material Hillside OperationParking The Mower After OperationAdjusting Cutting Height Moving Mower With Engine StoppedRecommendations For Mowing Adjusting The Height Adjust Pedal Adjusting The Steering LeversTowing Optional Hitch Accessory Condition Cause Cure Troubleshooting Cutting ConditionsSloping Ridge Across E v e n C u t o n F l atGround Wavy High-Low Appearance, Scalloped Cut, or Rough ContourCutting path Scalping Blades HittingDirt or CuttingVery Close To the Ground Step Cut Ridge in CenterBrake Adjustment AdjustmentsRH Steering Control Rod Adjustment Neutral AdjustmentTracking Adjustment Throttle Control and Choke AdjustmentsCutter Deck Pitch Cutter Deck LevelCutter Deck Height Cutter Deck Height AdjustmentCustom-Cut Baffle Adjustment Position Custom-Cut Baffle Adjustment Early ModelsPosition Custom-Cut Baffle Adjustment Current Production Position Custom-Cut Baffle Adjustment Clutch Air Gap Adjustment Electric clutch adjustmentHours MaintenanceMaintenance Chart Recommended Service Intervals Procedure Comments Break-In 100 200 500 FirstLocation Lubrication Interval Lubricant NO. Places LubricationLubrication Fitting Points Changing Hydraulic Oil Checking Hydraulic Oil LevelEngine Fuel System Engine OilEngine Air Cleaner Cleaning and/or Replacing Air Cleaner ElementReplacing In-Line Fuel Filter Elements Jump Starting BatteryCharging the Battery Battery Electrolyte First AIDBlade Inspection Blade ReplacementDrive Belts Cutter BladesTires Cutter Deck GearboxChecking Lubricant Level Checking Coolant Level Cleaning the Radiator Debris ScreenCooling System Changing LubricantChecking The Fan Belt Tension Body, Deck, And UpholsteryScag Approved Attachments And Accessories Illustrated Parts ListIllustrated Parts List 61V & 72VS Cutter Decks Description Cutter Deck Controls Cutter Deck Controls Sheet Metal Components Fender Weldment, RH Bolt, Hex Hd., 5/16-18 x 1, Zinc 43606 STT ROLL-OVER Protection System with Suspension Seat STT ROLL-OVER Protection System with Suspension Seat Deck Drive Components Belt Guard, Rear Hinge, Belt Guard 481309 Latch, Hood 482845 Engine & Attaching Parts 31HP-EFI Kohler Available through the individual engine manufacturer Brake and Steering Components Grip, Handle Bar Fuel and Hydraulic System Kohler 31EFI 24 403 BDP-16A Hydraulic Pump Assembly with Cooling FAN HG70924 Charge Pump Kit .19 STD. Splined HG51457 Electrical System 31HP-EFI Kohler Electrical System 31HP-EFI Kohler Heavy-Duty Commercial STT-EFI Decals Page2 Electrical Schematic Kohler 31HP EFI Limited Warranty Commercial Equipment Garantía Limitada Equipo Comercial Nota Tapicería y plataforma CuerpoRadiador del desechos de criba la de Limpieza .B Ventilador del correa la de tensión la de Verificación .CLa de cambios de Caja Refrigeración de SistemaCorte de plataforma Corte de cuchillas con trabajar al ojos y LlantasCuchilla la de Reemplazo .C Nota Cuchilla la de Reemplazo .8-7 FiguraPuente por Arranque .B Corte de CuchillasTransmisión de Correas Cuchilla la de Inspección .ABatería DE Electrolito Para Auxilios Primeros BateríaBatería la de Carga .A Agua con Enjuague externo ContactoDel elementos los de Reemplazo .B Motor del aire de FiltroAire de filtro del elemento del reemplazo y/o Limpieza .A Línea en combustible de filtroMotor del Aceite Motor del combustible de SistemaHidráulico Sistema Hidráulico aceite de nivel del Verificación .AHidráulico aceite de Filtro .3-7 Figura Conexión de puntos de Lubricación .1-7 Figura Lubricación Ciones Lubricación Ubica Lubricante Ubicación DE IntervaloHoras Recomendados servicio de Intervalos mantenimiento de Tabla MantenimientoMontaje de accesorios de Ubicación Montaje de Ranura Personalizado corte de deflector del Ajuste Posiciones 7 de personalizado corte de deflector del AjustePosiciones 3 de personalizado corte de deflector del Ajuste Plataforma la de altura de Ajuste .7-6 Figura Corte de plataforma la de AlturaCorte de plataforma la de Tope .8-6 Figura Corte deCorte de plataforma la de Inclinación Corte de plataforma la de NivelCorte de Plataforma la de nivel del Ajuste .5-6 Figura Estrangulación y aceleración De controles los de AjustesAlineación de Ajuste Neutral Ajuste Desplazamiento de AjustesFreno del vAjuste .1-6 Figura AjustesEstacionamiento de freno del Ajuste Freno de varilla la de Ajuste .2-6 FiguraInclinado Corte Corte de trayectoriaLa de ancho del través Inclinadas CrestasVolado corte ondulada La de ancho lo aInclinadas Salientes Irregular perfil oLa en cortar sin césped Corte de trayectoriasEntre cortar sin césped De Franjas VetasAltura la de ajuste de pedal del Ubicaciones .8-4 Figura Opcional enganche de accesorio RemolquePlataforma la de liberación de Palanca .6-4 Figura Altura de ajuste de pedal del AjusteDirección de palancas las de Ajuste Dirección De palancas las de Ajuste .7-4 FiguraDetenido motor el con cortacésped del Desplazamiento Corte de altura la de AjusteCésped el Cortar para RecomendacionesCuesta una en Operación Atascado material del RetriroOperación la de Después Cortacésped del EstacionamientoDel accionamiento de Interruptor .3-4 Figura Corte de cuchillas plataforma de transmisión la de ConexiónReversa en Desplazamiento CortadorAdelante hacia Desplazamiento Dirección y terreno el en DesplazamientoMotor del Arranque Inicial arranque de ProcedimientosUsado .1-4 Figura dirección de derecho Control Seguridad de bloqueo de SistemaDescarga de válvula de Control .2-4 Figura La Indica .1-4 Figura combustible de IndicadorOperación DE Instrucciones Instrumentos e controles de IdentificaciónInstrumentos e Controles .1-4 Figura Productividad Dimensiones y PesosMotor EspecificacionesPotencia de Cabezal Eléctrico SistemaSeguridad de y instructivas Calcomanías REvErSA AdELAntEChispas de supresor un Utilice Almacenamiento y mantenimientoDe Consideraciones Muerte la o graves lesiones ocasionar Mantener y inspeccionar de incumplimiento ElVuelco contra protección de plegable Sistema .1-2 Figura Vuelco contra protección de Sistema Equipado viene si vuelco contraProtección de Plegable Sistema Peligro Operación de Consideraciones Señalización de Palabras Seguridad DEInformación Operación la a previas ConsideracionesSímbolos STT ModelosDescripción Símbolo General Información Instrucciones de ReferenciaScag POR Aprobados Dispositivos USE Sólo Ajustes 6 Sección Sección Sigue Comercial Equipo Limitada GarantíaList Parts Illustrated 8 Sección Mantenimiento 7 SecciónGeneral Información 1 Sección Operación DE Instrucciones 4 SecciónEspecificaciones 3 Sección Seguridad DE Información 2 SecciónSS-31EFI-STT61V 72VS-SMT61V-SMT SS-31EFI-STTOperador DEL Manual

STT-31EFI-SS specifications

Scag Power Equipment is renowned for producing high-quality commercial mowing equipment, and the STT-31EFI-SS stand-on mower is no exception. Designed with professional landscapers in mind, the STT-31EFI-SS offers a perfect blend of power, efficiency, and maneuverability.

One of the standout features of the STT-31EFI-SS is its 31 hp EFI (Electronic Fuel Injection) engine. This powerhouse engine not only delivers impressive power but also enhances fuel efficiency. The EFI technology ensures that the engine operates at optimal performance by automatically adjusting the air-to-fuel ratio under varying conditions. This results in smoother starts, improved throttle response, and reduced emissions, making the mower both environmentally friendly and cost-effective in the long run.

The STT-31EFI-SS features a durable construction built to withstand the rigors of commercial use. Its robust steel frame and heavy-duty components are designed for maximum longevity. Moreover, the mower is equipped with Scag's cutting-edge Hydro-Gear ZT-3400 transmission, which offers exceptional speed and agility. This transmission allows operators to navigate tight spaces with ease and provides a top speed of up to 10.5 mph, making it ideal for large properties or demanding mowing tasks.

Operator comfort is another key aspect of the STT-31EFI-SS. The stand-on design promotes better visibility and quick maneuverability, enabling operators to navigate obstacles with confidence. The padded operator platform and adjustable controls ensure a comfortable experience, even during extended use. Additionally, the mower’s low center of gravity enhances stability on slopes and uneven terrain.

One of the most notable characteristics of the STT-31EFI-SS is its advanced cutting deck. The mower features a 48", 52", or 61" Velocity Plus cutting deck, which is known for delivering a superior cut and impressive grass dispersal. The deck is engineered for optimal airflow, enabling precision mowing while preventing clumping. This technology ensures that grass clippings are evenly distributed, resulting in a healthier lawn appearance.

In conclusion, the Scag STT-31EFI-SS stand-on mower integrates powerful performance, innovative engineering, and comfort. Featuring a reliable EFI engine, robust construction, and exceptional maneuverability, this mower stands out as an excellent choice for professional landscapers seeking efficiency and reliability in their equipment.
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