Overview
The Kubota B2301 and B2601 Tractor Workshop Service Manual provides technical documentation for maintenance, inspection, troubleshooting and component repair of these Kubota compact tractors. The workshop reference covers engine systems, hydrostatic transmission (HST), independent power take-off (PTO), rear axle, brakes, four-wheel-drive front axle, power steering, three-point hitch hydraulics and electrical equipment. Separate mechanism and servicing sections explain component construction, operating principles, technical specifications, adjustment, disassembly, assembly and repair procedures.
The documentation includes engine governor and fuel-system servicing, HST pump and motor operation, speed-set linkage, independent PTO clutch inspection, differential gear repair, steering hydraulic testing and three-point hitch position control. Hydraulic references also address front loader control valves and optional remote hydraulic equipment, while the electrical chapters provide starting and stopping circuits, Operator Presence Control (OPC), charging-system checks and instrument diagnostics. General maintenance information includes service schedules, lubricants, tightening torques, special tools, tyre adjustments and implement limitations.
Notice: The Hydraulic System chapter includes front loader control-valve information and remote control-valve procedures where equipped. These references do not establish that a separate loader workshop manual is supplied. Select the appropriate procedures according to the tractor configuration and installed hydraulic equipment.
Table of Contents
Kubota B2301, B2601 Manual
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01. Information, Safety and Specifications
- Safety First and General Safety Instructions
- Tractor Safety Decals
- Tractor Technical Specifications
- Tractor Travelling Speeds
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02. General Information and Maintenance
- Tractor Identification
- General Workshop Precautions
- Electrical Wiring and Component Handling Precautions
- Lubricants, Fuel and Coolant Requirements
- General Fastener Tightening Torques
- Tractor Maintenance Checklist
- Daily Inspection and Maintenance
- Periodic Maintenance and Service Checks
- Special Service Tools for Engine Repair
- Special Service Tools for Tractor Components
- Tyre Inflation Pressure
- Wheel Tread Adjustment
- Implement Limitations
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03. Engine — Mechanism and Servicing
- Engine Body Construction
- Closed Breather System
- Engine Governor Mechanism
- Engine Troubleshooting
- Engine Servicing Specifications
- Engine and Tractor Tightening Torques
- Engine Body Checking and Adjustment
- Engine Lubricating System Inspection
- Engine Cooling System Checking and Adjustment
- Engine Fuel System Checking and Adjustment
- Draining Engine Lubricants and Coolant
- Engine Separation from Clutch Housing
- Engine Separation from Front Axle Frame
- External Engine Component Disassembly
- Cylinder Head, Valves and Oil Pan Disassembly
- Engine Gear Case Disassembly
- Piston and Connecting Rod Disassembly
- Crankshaft Disassembly and Assembly
- Cylinder Head and Valve Inspection and Servicing
- Idle Gear and Camshaft Inspection
- Piston and Connecting Rod Servicing
- Crankshaft Inspection and Servicing
- Engine Cylinder Inspection and Servicing
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04. Transmission, Hydrostatic Drive and PTO
- Transmission Structure and Power Train
- Transmission Front Case Construction
- Hydrostatic Transmission (HST) Structure
- Hydrostatic Pump and Motor
- HST Hydraulic Oil Flow and Valve Operation
- HST Control Linkage
- Speed-Set Device and Linkage
- Speed-Set Engagement and Release
- Range Gear Shift Mechanism
- Front-Wheel-Drive Transmission Section
- Power Take-Off (PTO) System Construction
- Rear PTO Drive Section
- Combined Rear PTO and Mid-PTO Section
- Mid-PTO Drive Section
- Independent PTO Hydraulic Circuit
- Independent PTO Control Valve
- Independent PTO Clutch
- Independent PTO Lever Engagement and Disengagement
- Differential Gear System
- Differential Lock Mechanism
- Transmission Troubleshooting
- Transmission Servicing Specifications
- Transmission Tightening Torques
- HST Checking and Adjustment
- Independent PTO Control Valve Checking and Adjustment
- Transmission Removal Preparation
- Engine and Clutch Housing Separation
- Transmission Front Case Disassembly
- Hydrostatic Transmission Disassembly and Assembly
- PTO Clutch Case Disassembly
- Bevel Pinion Shaft and Sub Gear Shaft Removal
- Front-Wheel-Drive Shaft Disassembly
- Independent PTO Clutch Shifter Disassembly
- Independent PTO Clutch Disassembly and Assembly
- Mid-PTO Section Disassembly
- Differential Gear Disassembly and Assembly
- HST Component Inspection and Servicing
- Independent PTO Clutch Servicing
- Transmission Case Inspection and Servicing
- Differential Gear Inspection and Servicing
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05. Rear Axle — Mechanism and Servicing
- Rear Axle Construction
- Rear Axle Troubleshooting
- Rear Axle Tightening Torques
- Rear Axle Case Separation
- Rear Axle Case Disassembly and Assembly
- Rear Axle Component Inspection and Servicing
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06. Brake System — Mechanism and Servicing
- Brake Linkage Mechanism
- Brake System Operating Principles
- Brake Troubleshooting
- Brake Servicing Specifications
- Brake Tightening Torques
- Brake Checking and Adjustment
- Rear Axle Case Separation for Brake Servicing
- Rear Axle Case Disassembly
- Brake Component Inspection and Servicing
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07. Front Axle — Four-Wheel Drive
- Four-Wheel-Drive Front Axle Construction
- Front Axle Troubleshooting
- Front Axle Servicing Specifications
- Front Axle Tightening Torques
- Front Axle Checking and Adjustment
- Front Axle Assembly Removal
- Front Axle Disassembly and Assembly
- Front Axle Component Inspection and Servicing
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08. Power Steering System
- Power Steering Hydraulic Circuit
- Steering Controller Construction
- Power Steering Cylinder
- Power Steering Hydraulic Pump
- Steering System Troubleshooting
- Steering Servicing Specifications
- Steering Tightening Torques
- Steering Relief Valve Inspection
- Power Steering Hydraulic Pump Checking
- Power Steering Controller Removal
- Steering Controller Disassembly
- Power Steering Cylinder Disassembly
- Steering Cylinder Inspection and Servicing
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09. Hydraulic System and Three-Point Hitch
- Hydraulic System Circuit Diagram
- Hydraulic Pump Construction
- Three-Point Hitch Hydraulic Circuit
- Three-Point Hitch Relief Valve
- Position Control Valve Construction
- Position Control Valve Operation
- Position Control Feedback Linkage
- Front Loader Control Valve Construction
- Front Loader Control Valve Operation
- Optional Remote Hydraulic Control Valve
- Hydraulic Outlet
- Hydraulic System Troubleshooting
- Hydraulic Servicing Specifications
- Hydraulic Tightening Torques
- Three-Point Hitch Hydraulic Pump Checking and Adjustment
- Power Steering, PTO Clutch and HST Hydraulic Pump Checking
- Three-Point Hitch Relief Valve Checking and Adjustment
- Hydraulic Lift Arm Checking and Adjustment
- Hydraulic Pump Disassembly and Assembly
- Three-Point Hitch Disassembly and Assembly
- Hydraulic Cylinder Removal from Tractor Body
- Three-Point Hitch Hydraulic Cylinder Servicing
- Front Loader Control Valve Disassembly — If Equipped
- Remote Control Valve Disassembly — If Equipped
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10. Electrical System and Diagnostics
- Tractor Electrical Wiring Diagram
- Engine Starting and Stopping System
- Operator Presence Control (OPC) Circuit
- OPC Controller
- PTO Select Lever Safety Switch
- PTO Clutch Lever Safety Switch
- HST Pedal Safety Switch
- Operator Seat Safety Switch
- Starter Motor and Engine Stop Solenoid
- Engine Glow Plug System
- Battery Charging System
- Headlight Electrical Circuit
- Turn Signal and Hazard Light Circuits
- Instrument Panel and Easy Checker System
- Instrument Panel Switches and Sensors
- Electrical System Troubleshooting
- Electrical Servicing Specifications
- Electrical Tightening Torques
- Battery Inspection and Testing
- Fuse and Relay Checking
- Engine Key Switch Testing
- Starting Safety Switch Inspection
- OPC Controller Checking
- Engine Stop Solenoid Inspection
- Starter Motor Testing
- Glow Plug Checking
- AC Dynamo Inspection
- Charging Regulator Testing
- Combination Light Switch Testing
- Flasher Unit Inspection
- Instrument Panel Checking
- Engine Oil Pressure Switch Testing
- Coolant Temperature Sensor Inspection
- Fuel Level Sensor Testing
- Starter Motor Disassembly and Assembly
- AC Dynamo Disassembly and Assembly
- Starter Motor Component Servicing
Independent PTO, Hydrostatic Drive and Hydraulic Control References
The transmission chapter distinguishes the hydrostatic drive from the independent PTO system, including separate references for the HST pump and motor, hydraulic oil flow, speed-set linkage, PTO control valve and clutch operation. The rear and mid-PTO sections are identified individually, allowing the applicable power transmission components to be located during troubleshooting or disassembly. The differential and four-wheel-drive front axle are also covered in their corresponding servicing sections.
The Hydraulic System chapter documents the three-point hitch position control valve, feedback linkage, hydraulic pump, relief valve and lift-arm adjustments. It also provides front loader control-valve information and optional remote hydraulic references. The Electrical System chapter complements these mechanical and hydraulic sections with PTO safety switches, HST pedal interlocks, operator-presence controls and starting-system diagnostics. The relevant circuits and procedures should be selected according to the tractor’s installed equipment.
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