Scag Power Equipment STT-31EFI-SS Checking Hydraulic Oil Level, Changing Hydraulic Oil

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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.

- IMPORTANT -

If the oil level is consistently low, check for leaks and correct immediately.

1.Wipe dirt and contaminants from around the reservoir cap. Remove the cap from the hydraulic oil reservoir.

2.Visually check the level of hydraulic oil. Hydraulic oil must be at least 3" inches from top of the filler neck. If the level cannot be determined visually, use a clean tape measure to check the level. If the fluid is low, add 20W50 motor oil. DO NOT overfill; (overfilling the oil reservoir may cause oil seepage around the cap area).

3.Clean the fill cap and install it onto the reservoir.

Hydraulic Oil

Reservoir

STT99HOR-1

- IMPORTANT -

The hydraulic oil should be changed if you notice the presence of water or a rancid odor to the hydraulic oil.

1.Park the mower on a level surface and stop the engine.

2.Place a suitable container under the hydraulic oil filter. Remove the fill cap from the reservoir and the drain plug from the bottom of the drain tee fitting on the filter base. See Figure 7-3. Allow the fluid to drain into the container and properly discard it.

HYDRAULIC

OIL FILTER

390S0155-1

Figure 7-3. Hydraulic Oil Filter

3.Re-install the drain plug into the tee fitting and be sure it is tight.

- NOTE -

Before refilling the hydraulic oil reservoir the hydraulic oil filter should be changed as outlined in Procedure C "Changing Hydraulic Oil Filter Element" on page 34.

4.Fill the reservoir to 3-1/4" inches from the top of the filler neck with 20W50 motor oil.

Figure 7-2. Hydraulic Oil Reservoir

B. Changing Hydraulic Oil

The hydraulic oil should be changed after every 500 hours or annually, whichever occurs first. The oil should also be changed if the color of the fluid has become black or milky. A black color and/or a rancid odor usually indicates possible overheating of the oil, and a milky color usually indicates water in the hydraulic oil.

5.Replace the reservoir fill cap. Start the engine and drive forward and backward for two minutes. Check the oil level in the reservoir. If necessary, add oil to the reservoir.

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Contents OPERATOR’S Manual STT-31EFI-SS STT61V-31EFI-SSWith a serial number E3700001 to E3799999 Table of Contents Adjustments Following SectionIntroduction USE only Scag Approved Attachments and AccessoriesGeneral Information Direction ReferenceSTT Models SymbolsSymbol Description This symbol means Attention! Become Alert! Your Safety InformationSignal Words Signal WordOperation Considerations Section Roll-Over Protection System Foldable Roll-over protection system if equippedFoldable Roll-Over Protection System Maintenance Considerations & Storage Using a spark arrestorSafety And Instructional Decals Install Belt COvER Before Engine SpecificationsPower Head ElectricalHydraulic System Weights And DimensionsCutter Deck Operating Instructions Controls And Instrument IdentificationSafety Interlock System Dump Valve ControlGround Travel And Steering Initial Run-In ProceduresStarting The Engine Forward TravelEngaging The Deck Drive Cutter Blades Reverse TravelAfter Operation Hillside OperationParking The Mower Removing Clogged MaterialRecommendations For Mowing Adjusting Cutting HeightMoving Mower With Engine Stopped Adjusting The Steering Levers Adjusting The Height Adjust PedalTowing Optional Hitch Accessory Troubleshooting Cutting Conditions Condition Cause CureCut, or Rough Contour E v e n C u t o n F l atGround Wavy High-Low Appearance, Scalloped Sloping Ridge AcrossStep Cut Ridge in Center Scalping Blades HittingDirt or CuttingVery Close To the Ground Cutting pathAdjustments Brake AdjustmentNeutral Adjustment RH Steering Control Rod AdjustmentThrottle Control and Choke Adjustments Tracking AdjustmentCutter Deck Level Cutter Deck PitchCutter Deck Height Adjustment Cutter Deck HeightPosition Custom-Cut Baffle Adjustment Current Production Custom-Cut Baffle AdjustmentPosition Custom-Cut Baffle Adjustment Early Models Position Custom-Cut Baffle Adjustment Electric clutch adjustment Clutch Air Gap AdjustmentProcedure Comments Break-In 100 200 500 First MaintenanceMaintenance Chart Recommended Service Intervals HoursLubrication Location Lubrication Interval Lubricant NO. PlacesLubrication Fitting Points Checking Hydraulic Oil Level Changing Hydraulic OilEngine Oil Engine Fuel SystemReplacing In-Line Fuel Filter Elements Engine Air CleanerCleaning and/or Replacing Air Cleaner Element Battery Electrolyte First AID BatteryCharging the Battery Jump StartingCutter Blades Blade ReplacementDrive Belts Blade InspectionChecking Lubricant Level TiresCutter Deck Gearbox Changing Lubricant Cleaning the Radiator Debris ScreenCooling System Checking Coolant LevelBody, Deck, And Upholstery Checking The Fan Belt TensionIllustrated Parts List Scag Approved Attachments And AccessoriesIllustrated 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 Ventilador del correa la de tensión la de Verificación .C Tapicería y plataforma CuerpoRadiador del desechos de criba la de Limpieza .B NotaCorte de plataforma La de cambios de CajaRefrigeración de Sistema Nota Cuchilla la de Reemplazo .8-7 Figura LlantasCuchilla la de Reemplazo .C Corte de cuchillas con trabajar al ojos yCuchilla la de Inspección .A Corte de CuchillasTransmisión de Correas Puente por Arranque .BAgua con Enjuague externo Contacto BateríaBatería la de Carga .A Batería DE Electrolito Para Auxilios PrimerosLínea en combustible de filtro Motor del aire de FiltroAire de filtro del elemento del reemplazo y/o Limpieza .A Del elementos los de Reemplazo .BMotor del combustible de Sistema Motor del AceiteHidráulico aceite de Filtro .3-7 Figura Hidráulico SistemaHidráulico aceite de nivel del Verificación .A Conexión de puntos de Lubricación .1-7 Figura Horas LubricaciónCiones Lubricación Ubica Lubricante Ubicación DE Intervalo Mantenimiento Recomendados servicio de Intervalos mantenimiento de TablaMontaje de accesorios de Ubicación Montaje de Ranura Posiciones 3 de personalizado corte de deflector del Ajuste Personalizado corte de deflector del AjustePosiciones 7 de personalizado corte de deflector del Ajuste Corte de Corte de plataforma la de AlturaCorte de plataforma la de Tope .8-6 Figura Plataforma la de altura de Ajuste .7-6 FiguraCorte de Plataforma la de nivel del Ajuste .5-6 Figura Corte de plataforma la de InclinaciónCorte de plataforma la de Nivel Alineación de Ajuste Estrangulación y aceleraciónDe controles los de Ajustes Desplazamiento de Ajustes Neutral AjusteFreno de varilla la de Ajuste .2-6 Figura AjustesEstacionamiento de freno del Ajuste Freno del vAjuste .1-6 FiguraInclinadas Crestas Corte de trayectoriaLa de ancho del través Inclinado CorteIrregular perfil o La de ancho lo aInclinadas Salientes Volado corte onduladaDe Franjas Vetas Corte de trayectoriasEntre cortar sin césped La en cortar sin céspedOpcional enganche de accesorio Remolque Altura la de ajuste de pedal del Ubicaciones .8-4 FiguraDirección De palancas las de Ajuste .7-4 Figura Altura de ajuste de pedal del AjusteDirección de palancas las de Ajuste Plataforma la de liberación de Palanca .6-4 FiguraCortar para Recomendaciones Corte de altura la de AjusteCésped el Detenido motor el con cortacésped del DesplazamientoCortacésped del Estacionamiento Atascado material del RetriroOperación la de Después Cuesta una en OperaciónCortador Corte de cuchillas plataforma de transmisión la de ConexiónReversa en Desplazamiento Del accionamiento de Interruptor .3-4 FiguraInicial arranque de Procedimientos Dirección y terreno el en DesplazamientoMotor del Arranque Adelante hacia DesplazamientoLa Indica .1-4 Figura combustible de Indicador Seguridad de bloqueo de SistemaDescarga de válvula de Control .2-4 Figura Usado .1-4 Figura dirección de derecho ControlInstrumentos e Controles .1-4 Figura Operación DE InstruccionesInstrumentos e controles de Identificación Dimensiones y Pesos ProductividadEléctrico Sistema EspecificacionesPotencia de Cabezal MotorREvErSA AdELAntE Seguridad de y instructivas CalcomaníasDe Consideraciones Chispas de supresor un UtiliceAlmacenamiento y mantenimiento Vuelco contra protección de plegable Sistema .1-2 Figura Muerte la o graves lesiones ocasionarMantener y inspeccionar de incumplimiento El Protección de Plegable Sistema Vuelco contra protección de SistemaEquipado viene si vuelco contra Peligro Operación de Consideraciones Operación la a previas Consideraciones Seguridad DEInformación Señalización de PalabrasDescripción Símbolo SímbolosSTT Modelos Scag POR Aprobados Dispositivos USE Sólo General InformaciónInstrucciones de Referencia Mantenimiento 7 Sección Sección Sigue Comercial Equipo Limitada GarantíaList Parts Illustrated 8 Sección Ajustes 6 SecciónSeguridad DE Información 2 Sección Operación DE Instrucciones 4 SecciónEspecificaciones 3 Sección General Información 1 SecciónSS-31EFI-STT 72VS-SMT61V-SMT SS-31EFI-STT61VOperador 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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