Overview
The Kubota G23-2 and G26-2 Mower Workshop Service Manual provides technical documentation for maintenance, troubleshooting, inspection and component repair of these Kubota riding mowers. The workshop reference covers diesel engine components, hydrostatic transmission (HST), transaxle, front axle, power steering, hydraulic systems, electrical equipment, mower assemblies and grass-collector mechanisms. Its mechanism and servicing sections provide component construction, operating principles, technical specifications, checking, adjustment, disassembly and repair procedures for the covered equipment.
The documentation distinguishes mechanical and hydraulic power take-off (PTO) clutch arrangements, including their operating principles and servicing requirements. The hydraulic chapters also identify separate low-dump (LD) and high-dump (HD) grass-collector configurations, with corresponding hydraulic circuits, dump cylinders and lifting components. Additional technical information includes engine body servicing, starting and charging systems, operator presence controls, mower gear-case power transmission and grass-collector troubleshooting. General maintenance references provide daily checks, scheduled servicing intervals, lubricants, tightening torques, tyre information and special service tools.
Notice: The workshop documentation distinguishes G23 mechanical PTO clutch and G26 hydraulic PTO clutch arrangements, together with LD and HD grass-collector configurations. Confirm the installed PTO and collector equipment before selecting hydraulic diagrams, component specifications or servicing procedures. Do not assume that all covered configurations use interchangeable assemblies.
Table of Contents
Kubota G23-2, G26-2 Manual
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01. Information and Safety
- Safety First and Workshop Safety Instructions
- Mower Safety Decals and Warning Labels
- Machine Technical Specifications
- Machine Dimensions
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02. General Information and Maintenance
- Machine Identification
- Machine Serial Number Identification
- Engine Cylinder Number Identification
- General Workshop Precautions
- Electrical Wiring and Component Handling Precautions
- Battery, Fuse and Electrical Connector Handling
- Circuit Tester Precautions
- Electrical Wiring Colour Identification
- Lubricants, Fuel and Coolant Requirements
- General Fastener Tightening Torques
- Stud Bolt Tightening Specifications
- UNC and UNF Threaded Fastener Specifications
- Plug Tightening Torques
- Machine Maintenance Checklist
- Daily Inspection — Walking Around the Machine
- Daily Mower Inspection
- Operator Seat Inspection Checks
- Key Switch and Starting System Daily Checks
- Engine Starting Inspection
- Initial 50-Hour Maintenance
- Periodic Maintenance — Every 50 Hours
- Periodic Maintenance — Every 100 Hours
- Periodic Maintenance — Every 150 Hours
- Periodic Maintenance — Every 200 Hours
- Periodic Maintenance — Every 400 Hours
- Periodic Maintenance — Every 1500 Hours
- Periodic Maintenance — Every 3000 Hours
- Annual Maintenance Requirements
- Two-Year Maintenance Requirements
- Additional Maintenance and Service Checks
- Special Service Tools for Engine Repair
- Special Service Tools for Machine Components
- Tyre Inflation Pressure
- Wheel Information
- Implement Limitations
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03. Engine — Mechanism and Servicing
- Engine Body Construction
- Half-Floating Head Cover
- Closed Breather System
- Piston Construction — G23 Configuration
- Engine Oil Pan — G23 Configuration
- Engine Cooling System
- Cooling Fin Information — G23 Configuration
- Governor Information — G26 Configuration
- Boost Compensator
- Engine Troubleshooting
- Engine Servicing Specifications — G23 Configuration
- Engine Servicing Specifications — G26 Configuration
- Engine Tightening Torques
- Engine Body Checking and Adjustment
- Engine Lubricating System Inspection
- Cooling System Checking and Adjustment
- Fuel System Checking and Adjustment
- Engine Separation from Machine
- Engine External Component Removal
- Cylinder Head and Valve Disassembly
- Gear Case and Timing Gear Disassembly
- Piston and Connecting Rod Disassembly
- Flywheel and Crankshaft Disassembly
- Cylinder Head and Valve Inspection and Servicing
- Timing Gear, Camshaft and Governor Gear Servicing
- Piston and Connecting Rod Inspection and Servicing
- Crankshaft Inspection and Servicing
- Engine Cylinder Inspection and Servicing
- Engine Oil Pump Servicing — G23 Configuration
- Engine Oil Pump Servicing — G26 Configuration
- Oil Pressure Relief Valve Spring Inspection
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04. Transaxle, HST and PTO Clutch
- Transaxle Construction and Structure
- Hydrostatic Transmission (HST) Section
- Rear Axle Mechanism
- Transaxle Brake Mechanism
- Power Take-Off (PTO) Clutch Construction
- Mechanical PTO Clutch Structure
- Mechanical PTO Clutch Engagement
- Mechanical PTO Clutch Disengagement
- Hydraulic PTO Clutch Structure
- Hydraulic PTO Clutch Engagement
- Hydraulic PTO Clutch Disengagement
- Transaxle Troubleshooting
- Transaxle Servicing Specifications
- Transaxle Tightening Torques
- Transaxle Checking and Adjustment
- Transaxle Separation and Removal
- Transaxle Disassembly
- PTO Clutch Disassembly
- Hydrostatic Transmission Inspection and Servicing
- Transaxle Case Inspection and Servicing
- Transaxle Brake Servicing
- Mechanical PTO Clutch Servicing
- Hydraulic PTO Clutch Servicing
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05. Front Axle — Inspection and Servicing
- Front Axle Troubleshooting
- Front Axle Servicing Specifications
- Front Axle Tightening Torques
- Front Axle Checking and Adjustment
- Front Axle Assembly Separation
- Front Axle Disassembly and Assembly
- Front Axle Component Inspection and Servicing
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06. Power Steering System
- Power Steering Hydraulic Circuit — Mechanical PTO Configuration
- Power Steering Hydraulic Circuit — Hydraulic PTO Configuration
- Steering Controller Construction
- Power Steering Cylinder
- Steering System Troubleshooting
- Steering Servicing Specifications
- Steering Tightening Torques
- Power Steering Relief Valve Inspection
- Power Steering Cylinder Disassembly
- Steering Controller Disassembly
- Steering Component Inspection and Servicing
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07. Hydraulic System and Grass-Collector Lift
- Hydraulic Circuit — G23 Mechanical PTO, LD Configuration
- Hydraulic Circuit — G23 Mechanical PTO, HD Configuration
- Hydraulic Circuit — G26 Hydraulic PTO, LD Configuration
- Hydraulic Circuit — G26 Hydraulic PTO, HD Configuration
- Hydraulic Pump Construction
- Hydraulic Relief Valve
- Hydraulic Flow Priority Valve
- Hydraulic Control Valve
- Mower Lift Cylinder
- Grass-Collector Dump Cylinder — LD Configuration
- Grass-Collector Dump Cylinder — HD Configuration
- Grass-Collector Lift Cylinder — HD Configuration
- Hydraulic System Troubleshooting
- Hydraulic Servicing Specifications
- Hydraulic Tightening Torques
- Hydraulic System Checking and Adjustment
- Hydraulic Component Removal
- Hydraulic Component Disassembly
- Hydraulic Pump Inspection and Servicing
- Hydraulic Lift Cylinder Inspection and Servicing
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08. Electrical System and Safety Controls
- Electrical Wiring Diagram
- Engine Starting System Circuit
- Starting Safety Switch
- Safety Switch Types and Functions
- Battery Charging System Circuit
- IC Regulator — Three-Pin Connector Type
- Lighting System Circuit
- Electrical Gauge Circuit
- Hour Meter and Tachometer
- Fuel Level Gauge
- Coolant Temperature Gauge
- Grass-Collector Buzzer System
- Buzzer Electrical Circuit
- Grass-Collector Duct Switch
- Electrical System Troubleshooting
- Electrical Servicing Specifications
- Electrical Tightening Torques
- Battery Inspection and Testing
- Main Switch Checking
- Starter Motor Inspection
- Glow Plug Testing
- Safety Switch Inspection
- Operator Presence Control (OPC) Switch Testing
- Grass-Collector Duct Switch Inspection
- Grass-Collector Buzzer Testing
- Electric Fuel Pump Inspection
- Engine Stop Solenoid Checking
- Timer Relay Inspection
- Charging System Testing
- Alternator Inspection
- Combination Switch Checking
- Electrical Gauge Inspection
- Starter Motor Disassembly and Assembly
- Alternator Disassembly and Assembly
- Starter Motor Component Servicing
- Alternator Component Servicing
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09. Rotary Mower — Mechanism and Servicing
- Rotary Mower Power Transmission
- Mower Gear Case Power Train
- Rotary Mower Lifting Mechanism
- Rotary Mower Troubleshooting
- Mower Servicing Specifications
- Mower Tightening Torques
- Mower Checking and Adjustment
- Rotary Mower Disassembly and Assembly
- Mower Component Inspection and Servicing
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10. Grass Collector — LD and HD Servicing
- Grass-Collector Troubleshooting
- Grass-Collector Servicing Specifications
- Grass-Collector Tightening Torques
- Grass-Collector Checking and Inspection
- Low-Dump (LD) Grass-Collector Disassembly
- High-Dump (HD) Grass-Collector Disassembly
Mechanical and Hydraulic PTO Clutches with LD/HD Collector Servicing
The Transaxle chapter distinguishes the G23 mechanical PTO clutch from the G26 hydraulic PTO clutch, documenting their construction, engagement and disengagement. The Power Steering chapter also provides separate hydraulic circuit references for these arrangements. When investigating PTO engagement, mower-drive problems or related hydraulic behaviour, confirm the installed clutch configuration before applying adjustment or servicing instructions. Mechanical and hydraulic PTO clutch procedures should not be treated as interchangeable.
The Hydraulic System chapter further distinguishes low-dump and high-dump grass-collector equipment. Both configurations have documented dump-cylinder arrangements, while the HD configuration includes a separate grass-collector lift cylinder. The Grass Collector chapter provides distinct disassembly instructions for LD and HD assemblies, and the Electrical System covers the collector duct switch and warning buzzer. These references should be used together when investigating collector movement, dumping operation or electrical warning faults. Engine service specifications and oil-pump procedures are also separated by engine configuration, making correct equipment identification essential before component repair.
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