Great Dane GDRZ61-25KHE, GDRZ72-27KHE, GDRZ61-25KAE, GDRZ61-28KHE, GDRZ61-26KHE manual Service Engine

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SERVICE ENGINE

Keep in mind that EFI-related problems are more often caused by the wiring harness or connections than by the EFI components. Even small amounts of corrosion or oxidation on the terminals can interfere with the milliampere currents used in system operation. Cleaning the connectors and grounds will solve problems in many cases. In an emergency situation, simply disconnecting and reconnecting the connectors may clean up the contacts enough to restore operation, at least temporarily.

IMPORTANT: Avoid damage! When performing voltage or continuity tests, avoid putting excessive pressure on or against the connector pins. Flat probes are recommended for testing to avoid spreading or bending the terminals.

If the MIL indicates a problem with the EFI system, first disconnect the Electronic Control Unit (ECU) connector and test for continuity between the component connector terminals and the corresponding terminals in the ECU connector using an ohmmeter. Little or no resistance should be measured, indicating that the circuit is good.

If the condition cannot be corrected by checking the electrical system and connections, the EFI system must be serviced by an authorized Kohler EFI servicing dealer.

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Contents OPERATOR’S Manual Introduction Using Your Operator’s ManualSpecial Messages Product Identification Record Identification NumbersTable of Contents Safety Understanding The Machine Safety LabelsM131748, MX15340 Certification Emission Control System Certification LabelEmission Compliance Period Canadian Electromagnetic Compatibility EMC ComplianceOperator Training Required Operating SafelyParking Safely Using a Spark ArrestorChecking Mowing Area Rotating Blades are DangerousAvoid Tipping Keep Riders OffChecking Wheel Bolts Wear Appropriate Clothing Practice Safe MaintenanceDriving Safely on Public Roads Avoid High-Pressure Fluids Tire SafetyPrevent Fires Handling Waste Products and Chemicals Handling Fuel SafelyFuel and fuel vapors are highly flammable Operating Daily Operating ChecklistTesting Safety Systems Operator Station ControlsTesting Neutral Start Switch Testing PTO SwitchTesting Park Brake Switch Testing Seat SwitchMounting and Dismounting Machine Safely Adjusting SeatAdjusting Mower Deck Cutting Height Raising and Lowering Operator SeatAdjusting Mower Deck Anti-Scalp Wheels Using the Park BrakeUnlocking Park Brake Using the Key SwitchUsing the PTO Engage PTOUsing the Choke Carbureted Engines Only Using the Throttle LeverUsing the Hourmeter Using the Motion Control LeversNeutral Lock Position Optional Over the Lap Levers Gentle Left Turn Forward Gentle Right TurnReverse Sharp Left TurnStarting the Engine Engaging Mower Stopping the EngineMowing Tips Using Hydraulic Pump Free-Wheel ValvesTransporting Machine Picture Note Left pump shownDismounting to Inspect Mower Mowing Travel SpeedsAvoid Damage to Plastic and Painted Surfaces Parts Replacement PartsPart Numbers Service Intervals Spray Lubricant Service LubricationGrease Lubrication PointsPicture Note 48-, 52- and 61-inch mower decks Picture Note 72-inch mower deckService Engine Cleaning Engine Oil Cooler Kohler Engines Checking and Cleaning Air Filter Elements Cleaning Engine Air Intake Screen and Fan Oil Capacity With Filter DryReplacing Fuel Filter Fuel Injected Engines Checking Spark Plug Adjusting Carburetor Carbureted EnginesReplacing Fuel Filter Carbureted Engines Picture Note Kawasaki engine shownTroubleshooting the Kohler Electronic Fuel Injection System Priming Fuel Injectors Fuel Injected EnginesService Engine Checking Hydraulic Oil Level Service TransmissionHydraulic Oil Changing Hydraulic Oil and FilterRemoving and Installing Traction Drive Belt Cleaning Hydraulic Pump Cooling FinsNeutral Creep Adjustment Checking and Adjusting Motion Control LinkagesCheck Maximum Speed Drift Maximum Speed Drift Adjustment Hydraulic System Hose Routing Hydraulic System Schematic Cooling OrificeServicing Front Caster Wheel Roller Bearings Chariot Service Steering & BrakesRemove and Install Front Caster Wheels Servicing Front Caster Wheel Roller Bearings Chariot LXAdjusting Front Caster Spindle Bearing Servicing Caster Spindle BearingsHeight Adjustment Procedure Check AlignmentAdjusting Park Brake Alignment ProcedureRemoving and Installing Mower Deck Foot Plate Service MowerRemoving and Installing Mower Deck Belt Shields Checking Level Side-to-Side Adjusting Level Side-to-SideLeveling Mower Deck Picture Note Discharge chute raised for photo clarityChecking and Adjusting Cutting Height Adjust Thrust Arm-to-Stop Rod Clearance Transport PositionAdjust Assist Spring Tension Adjusting Deck Lift Assist Spring TensionCheck Spring Tension MX15328 MX15318 Checking and Replacing Mower Blades Balancing Blades Sharpening BladesReplacing Mower Blades Replacing Mower Spindle Bearings 72-Inch Mower Deck Service Mower Removing and Installing the Battery Service ElectricalCleaning Battery and Terminals Replacing Fuse Carbureted Engines Using Booster BatteryBooster Battery Disabled Vehicle Battery Replacing Fuses Fuel Injected EnginesBurnishing the PTO Clutch Wiring Schematic Carbureted Engines Wiring Schematic 26 HP Fuel Injected Engine Wiring Schematic 28 HP Fuel Injected Engine Checking Tire Pressure Service MiscellaneousFilling Fuel Tank Tire Size PressureRemove and Install Rear Drive Wheels Cleaning and Repairing Metal SurfacesUsing Troubleshooting Chart TroubleshootingCheck Troubleshooting Electrical System Park Brake MachineSteering Mower Deck Preparing Machine for Storage Storing SafetyStorage Preparing Fuel and Engine for StorageAssembly Check Safety System Install Motion Control LeversInstall Seat Lubricate MachineInitial Adjustments Specifications Height Adjustment Increments mm 1/2 Belt Shields, Removing and Installing Mower Deck IndexSpindle Bearings, Replace, 48-, 52- and 61-In. Decks Service Record GD Record Service Dates