Overview
The Kubota L3301, L3901 and L4701 Tractor Workshop Service Manual provides technical information for inspection, maintenance, fault diagnosis and component repair. Its Information and General sections cover identification, safety decals, model specifications, operating speeds, dimensions, lubrication, tightening torques and scheduled servicing. The Engine section describes common-rail fuel injection, electronic engine controls, exhaust gas recirculation (EGR), after-treatment components and engine overhaul procedures.
Additional chapters address the travelling clutch, manual and hydrostatic (HST) transmissions, rear axle, brakes, 2WD and 4WD front axles, steering, three-point hitch hydraulics and electrical diagnostics. The manual distinguishes operating principles from service procedures, including testing, adjustments, removal, disassembly and assembly. Model-specific references identify differences between the L3301/L3901 and L4701 in transmission arrangements, clutch access, steering components and hydraulic circuits.
Important Information: The workshop manual covers the L3301, L3901 and L4701. The separately listed operating manual is identified for the L3301 and L3901 only; L4701 operating-manual coverage is not confirmed. Refer to the product’s What’s Included section for the individual file descriptions.
Table of Contents
Kubota L3301, L3901, L4701 Manual
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01. Information and Safety
- Safety First
- Safety Decals — L3301/L3901 and L4701
- Model Specifications — L3301/L3901 and L4701
- Travelling Speeds — L3301/L3901 and L4701
- Tractor Dimensions — L3301/L3901 and L4701
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02. General Information and Maintenance
- Tractor Identification, Model Names and Serial Numbers
- E4B Engine Identification and Cylinder Number
- General Workshop and Electrical Handling Precautions
- Wiring, Battery, Fuses, Connectors and Circuit Tester
- Wire Colour Identification
- Lubricants, Fuel and Coolant — Model-Specific Requirements
- Tightening Torques — General Fasteners, Studs, Metric and UNC/UNF Threads
- Plug Tightening Torques
- Maintenance Checklists — L3301/L3901 and L4701
- Daily Checks and 50-, 100- and 200-Hour Maintenance
- 400-, 600- and 800-Hour Maintenance
- 1,000-Hour or Annual and 1,500-Hour Maintenance
- 2,000-Hour or Two-Year and 3,000-Hour Maintenance
- Additional Annual, Two-Year and Four-Year Maintenance
- Special Tools for Engine and Tractor
- Tyre Pressure, Tread Adjustment and Liquid Ballasting
- Implement Limitations
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03. Engine — Mechanism and Servicing
- Engine Features, Piston and Half-Floating Head Cover
- Lubrication System and Oil Cooler
- Cooling System — Thermostat and Bottom Bypass
- Common-Rail Fuel System — Supply Pump, Rail and Injectors
- Engine ECU and Sensor Controls
- EGR System — Cooler and Valve
- Exhaust After-Treatment Devices
- Engine Troubleshooting, Service Specifications and Tightening Torques
- Engine Body, Lubrication and Cooling Checks and Adjustments
- PCV Valve, EGR Cooler and Acceleration Sensor Checks
- DPF Muffler Separation and Engine Removal Preparation
- Separating the Engine from the Clutch Housing and Front Axle Frame
- Engine External Parts and EGR Disassembly/Assembly
- Common-Rail Components and Fuel Supply Pump Disassembly/Assembly
- Cylinder Head and Valve Disassembly/Assembly and Servicing
- Thermostat, Water Pump and Oil Cooler Disassembly/Assembly
- Gear Case, Timing Gear and Camshaft Servicing
- Piston and Connecting Rod Disassembly/Assembly and Servicing
- Flywheel, Crankshaft and Cylinder Servicing
- Engine Oil Pump Servicing
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04. Clutch — Mechanism and Servicing
- Travelling Clutch — Manual Transmission and HST Models
- Clutch Troubleshooting, Specifications and Tightening Torques
- Clutch Checking and Adjustment
- Engine-to-Clutch Housing Separation — L3301/L3901
- Clutch Assembly Removal and Installation — L3301/L3901
- Engine-to-Clutch Housing Separation — L4701
- Clutch Assembly Removal and Installation — L4701
- Single-Stage and Dual-Stage Clutch Servicing
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05. Transmission — Manual and Hydrostatic (HST)
- Manual Transmission Structures — L3301, L3901 and L4701
- HST Structures — L3301/L3901 and L4701
- Manual Power Train — Main Gear Shift and Synchro-Shuttle
- Manual Range Gear Shift and 4WD Drive Section
- Manual PTO System, Shift Linkage and L4701 PTO Clutch
- HST Assembly Construction, Oil Flow and Operation
- HST Range Gear Shift and Front-Wheel Drive
- HST Pedal Control Linkage and Cruise Control
- HST PTO Structure and Operating Mechanism
- Transmission Troubleshooting
- Model-Specific Service Specifications and Tightening Torques
- Manual and HST Checking and Adjustment — L3301/L3901
- Manual and HST Checking and Adjustment — L4701
- Transmission Preparation and Disassembly — L3301/L3901
- Manual Transmission and HST Assembly — L3301/L3901
- Transmission Preparation and Disassembly — L4701
- Manual Transmission and HST Assembly — L4701
- Clutch Housing and Transmission Case Servicing — L3301/L3901
- Clutch Housing, Mid Case and Transmission Case Servicing — L4701
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06. Rear Axle
- Rear Axle Structure and Mechanism
- Rear Axle Troubleshooting and Tightening Torques
- Rear Axle Case Separation
- Rear Axle Disassembly, Assembly and Servicing
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07. Brake System
- Brake Construction and Operation
- Brake Troubleshooting, Service Specifications and Tightening Torques
- Brake Checking and Adjustment
- Brake Case Separation, Disassembly and Assembly
- Brake Component Servicing
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08. Front Axle — 2WD and 4WD
- 2WD and 4WD Front Axle Structures
- Front Axle Troubleshooting and Service Specifications
- Front Axle Tightening Torques, Checking and Adjustment
- Front Axle Separation and Disassembly — L3301/L3901
- Front Axle Separation and Disassembly — L4701
- 2WD Front Axle Servicing
- 4WD Front Axle Servicing
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09. Steering System
- Steering Linkage and Hydraulic Circuits — L3301/L3901
- Steering Gearbox Structure and Operation — L3301/L3901
- Steering Linkage and Hydraulic Circuits — L4701
- Steering Controller, Gerotor Metering Device and Oil Flow — L4701
- Steering Cylinder — L4701
- Model-Specific Steering Troubleshooting
- Steering Service Specifications and Tightening Torques
- Steering Wheel Play Checking — L3301/L3901
- Power Steering Pump Flow-Meter Test
- Relief Valve Adjustment and System Bleeding
- Steering Hydraulic Pump and Gearbox Removal — L3301/L3901
- Steering Hydraulic Pump and Controller Removal — L4701
- Steering Pump and Gearbox Servicing — L3301/L3901
- Steering Pump Servicing — L4701
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10. Hydraulic System and Three-Point Hitch
- Hydraulic System Structures — L3301/L3901 and L4701
- Manual Transmission and HST Hydraulic Circuits
- Three-Point Hitch Hydraulic Circuit and Lift Cylinder
- Three-Point Hitch Linkage and Position Control Valve
- Three-Point Hitch Hydraulic Pump and Safety Valve
- Front Hydraulic Block and Relief Valve
- Hydraulic Troubleshooting, Specifications and Tightening Torques
- Power Steering and Three-Point Hitch Pump Flow-Meter Testing
- Power Steering and Three-Point Hitch Relief Valve Checks
- Hydraulic Safety Valve Testing
- Position Control Rod Adjustment — L3301/L3901 and L4701
- Hydraulic Pump Removal and Assembly — L3301/L3901
- Hydraulic Pump Removal and Assembly — L4701
- Hydraulic Cylinder and Position Control Valve Disassembly/Assembly
- Relief Valve Disassembly/Assembly
- Hydraulic Pump and Cylinder Servicing
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11. Electrical System and Electronic Diagnostics
- Electrical Circuit Diagrams — L3301/L3901 and L4701
- Instrument Panel Construction, ECU, Switches and Sensors
- Meter Indications and Easy Checker
- Instrument-Panel Self-Diagnosis, Testing and Adjustment
- Engine Starting, Stopping and Operator Presence Control (OPC)
- Controller Area Network (CAN)
- Electrical Troubleshooting, Specifications and Tightening Torques
- Battery, Fuses, Grounds and Connector Checks
- Instrument-Panel Test, Error Clear, Sensor Adjustment and Model Selection Modes
- Main ECU and Engine ECU Connector Checks
- Key Switch, Safety Switches, Starter and Relay Testing
- Glow Control and OPC System Checks — Model-Specific
- Charging System and Lighting Circuit Testing
- Warning Lamps, Monitor Lamps and Gauges
- Common-Rail Injector, Suction Control Valve and Rail Pressure Sensor Testing
- Fuel Pump, EGR Valve and Intake Throttle Valve Testing
- Crankshaft and Camshaft Position Sensor Checks
- Airflow, Exhaust Temperature and Differential Pressure Sensor Checks
- Parked Regeneration and DPF Inhibit Switch Checks
- Acceleration Sensor Checks
- CCV Heater and Relay Checks
- Starter Motor and Alternator Disassembly/Assembly and Servicing
Transmission Variants and Electronic Service References
Before following clutch, transmission, axle, steering or hydraulic instructions, identify the tractor model and whether it has a manual transmission or HST. The service information differentiates L3301/L3901 and L4701 transmission cases and assembly procedures, as well as the steering gearbox used in the L3301/L3901 references and the steering-controller arrangement documented for the L4701.
Engine and electrical service sections complement each other for common-rail, EGR and after-treatment diagnosis. The electrical references include ECU connector tests, sensor checks, instrument-panel diagnostic modes, parked regeneration and DPF inhibit switches. Use the system-specific procedures and test specifications for the applicable model and equipment.
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