Overview
The Kubota F2690, F2690E and F3990 Front Mower Workshop Service Manual provides technical documentation for maintenance, inspection, fault diagnosis and component repair of these Kubota front-mounted mowing machines. The workshop reference covers machine identification, safety instructions, service schedules, engine systems, hydrostatic transmission (HST), front and rear axles, brakes, steering, hydraulics, electrical equipment and mower assemblies. It distinguishes the two-wheel-drive F2690E from the four-wheel-drive F2690 and F3990 where the servicing procedures differ.
The documentation includes D1105 governor and V1505 electronic-governor references, F3990-only constant RPM management and diesel particulate filter (DPF) regeneration information, HST pressure and drive-system servicing, hydraulic pump and lift-cylinder procedures, and electrical diagnostics. Mower coverage identifies the RCK60P-F39, RCK60R-F36, RCK72P-F39 and RCK72R-F36 decks, with separate maintenance, power transmission, adjustment and removal information. A separately listed operating manual should be consulted according to its stated scope in What’s Included.
Safety: Review the machine and mower safety instructions and decals before servicing or operating the equipment. The manual includes electrical-handling precautions, maintenance safety information and model-specific component removal procedures; follow the instructions applicable to the machine and mower deck being serviced.
Important Information: The F2690E is identified as a 2WD model, while the F2690 and F3990 are identified as 4WD models. Constant RPM management, certain engine controls and DPF-related procedures are specifically identified for the F3990. Verify the machine model and mower identification before selecting a service procedure.
Table of Contents
Kubota F2690, F2690E, F3990 Manual
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01. Information, Safety and Specifications
- Machine Safety Instructions and Precautions
- Machine Safety Decals
- Machine Specifications and Dimensions
- Mower Safety Decals and Terminology
- Mower Technical Specifications
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02. General Information and Maintenance
- Machine and Engine Serial Number Identification
- E4 Engine and Cylinder Identification
- General Workshop Precautions
- Electrical Wiring, Battery, Fuse and Connector Handling
- Circuit Tester Precautions and Wiring Colour Identification
- Lubricants, Fuel and Coolant Requirements
- General, Metric and UNC/UNF Fastener Tightening Torques
- Plug Tightening Torques
- Maintenance Checklist and Daily Inspection
- Initial 50-Hour Maintenance
- Periodic Maintenance — 50, 100 and 200 Hours
- Periodic Maintenance — 400 and 800 Hours
- 1,500- and 3,000-Hour Maintenance
- Annual and Two-Year Maintenance
- Additional Maintenance and Service Checks
- Special Service Tools for Engine and Machine
- Tyre Pressure and Implement Limitations
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03. Engine — Mechanism and Servicing
- Engine Body — Closed Breather and Half-Floating Head Cover
- Engine Lubricating, Cooling and Fuel Systems
- D1105 Fuel Governor and V1505 Electronic Governor
- Constant RPM Management Control — F3990 Only
- Reformer and Exhaust After-Treatment Devices
- DPF Regeneration Modes, Indicator Lamps and Particulate-Matter Warnings
- Engine Control System — V1505
- Engine Troubleshooting, Service Specifications and Tightening Torques
- Engine Body, Lubrication, Cooling and Fuel System Checks
- Turbocharger Inspection — F3990 Only
- DPF Muffler Removal — F3990 Only
- Engine Separation — F2690E and F2690
- Engine Separation — F3990
- External Engine Components — Model-Specific Disassembly and Assembly
- Cylinder Head and Valve Disassembly and Assembly
- Oil Pan, Timing Gears, Camshaft and Fuel Camshaft
- Piston, Connecting Rod and Crankshaft Disassembly and Assembly
- Cylinder Head, Valves and Timing Gear Servicing
- Camshaft, Governor Gear, Piston and Connecting Rod Servicing
- Crankshaft, Cylinder and Oil Pump Servicing
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04. Transmission, Hydrostatic Drive and PTO
- Transmission Structure — 2WD F2690E and 4WD F2690/F3990
- Hydrostatic Transmission (HST) Structure, Oil Flow and Operation
- HST Charge Relief Valve and High-Pressure Relief Valves
- HST Control Linkage
- Range Gear Shift — F2690E/F2690 and F3990
- Rear-Wheel Drive Section — 4WD Models Only
- Dual-Acting Overrunning and Full-Time 4WD Functions
- Power Take-Off (PTO) Section and Hydraulic PTO Clutch
- Differential Gear and Differential Lock Operation
- Transmission Troubleshooting, Service Specifications and Tightening Torques
- HST and Transmission Checking and Adjustment
- Transmission Assembly and HST Separation
- Transmission Case and Differential Gear Case Separation
- HST and Hydraulic PTO Clutch Disassembly and Assembly
- Rear-Wheel-Drive Case and Transmission Case Disassembly
- Differential Gear Case Disassembly and Assembly
- HST, PTO Clutch, Transmission Case and Differential Servicing
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05. Front Axle
- Front Axle Structure
- Front Axle Troubleshooting and Tightening Torques
- Front Axle Service Preparation
- Front Axle Disassembly and Assembly
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06. Brake System
- Brake System Structure and Operation
- Brake Troubleshooting, Service Specifications and Tightening Torques
- Brake Checking and Adjustment
- Brake Pedal Disassembly and Assembly
- Brake Assembly Disassembly and Servicing
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07. Rear Axle — 2WD and 4WD
- Rear Axle Structure — 4WD F2690 and F3990
- Rear Axle Structure — 2WD F2690E
- Rear Axle Troubleshooting and Service Specifications
- Rear Axle Tightening Torques and Adjustments
- Rear Axle Separation — 4WD Models
- Rear Axle Separation — 2WD Model
- Rear Axle Disassembly and Assembly — 4WD and 2WD Variants
- Model-Specific Rear Axle Servicing
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08. Steering System
- Steering Structure — F2690E/F2690 and F3990
- Steering Controller
- Steering Troubleshooting, Service Specifications and Tightening Torques
- Steering Relief Valve Checking and Adjustment
- Power Steering Controller and Support Removal
- Steering Shaft Disassembly and Assembly
- Steering Cylinder Servicing
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09. Hydraulic System and Mower Lift
- Hydraulic Circuits — F2690E/F2690 and F3990
- Hydraulic Pumps — Model-Specific Construction
- Flow Priority Valve — F2690E and F2690
- Hydraulic Relief Valve and Implement Control Valve
- Feedback Linkage
- Cylinder Safety Valve — F3990 Only
- Hydraulic Cylinders — F2690E/F2690 and F3990
- Hydraulic Troubleshooting, Specifications and Tightening Torques
- Hydraulic Pump and Flow Priority Valve Checking — F2690E/F2690
- Hydraulic Pump Checking — F3990
- Hydraulic Cylinder Assembly Checking and Adjustment
- Hydraulic Pump and Flow Priority Valve Disassembly — F2690E/F2690
- Hydraulic Pump Disassembly — F3990
- Hydraulic Cylinder Assembly Disassembly and Servicing
- Hydraulic Pump Servicing — Model-Specific Procedures
- Cylinder Safety Valve Servicing — F3990 Only
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10. Electrical System and Diagnostics
- Wiring Diagrams — F2690E/F2690 and F3990
- Starting System and Operator Presence Control (OPC) Circuits
- OPC Switches, Controller and Model-Specific Operation
- Meter Panel, Easy Checker, Service Codes and Error Codes
- Electrical Troubleshooting, Service Specifications and Tightening Torques
- Battery, Ground Connections, Fuses and Relays
- Meter Panel and OPC Controller Checks — F2690E/F2690
- Engine ECU Checks — F3990
- Main Switch, Safety Switch, Starter and Fuel Pump Testing
- Engine Stop Solenoid and Glow Plug Checks
- Throttle Lever Sensor, Governor Solenoid and Rack Position Sensor — F3990
- Engine Speed, After-Treatment Temperature and Differential Pressure Sensors — F3990
- DPF Doser Fuel Pump, Blower Motor and Air Valve Checks — F3990
- Blower Pressure Sensor, Heater Glow and Burner Glow Checks — F3990
- Automatic and Parked Regeneration Switches — F3990
- Alternator, Charging Circuit and Lighting System Checks
- Engine Oil Pressure, Coolant Temperature and Fuel Sensor Checks
- 4WD Lock Lever Switch — 4WD Models Only
- Starter and Alternator Disassembly, Assembly and Servicing
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11. Rotary Mower — General, Mechanism and Servicing
- Mower Identification — RCK60P-F39, RCK60R-F36, RCK72P-F39 and RCK72R-F36
- Mower General Precautions and Lubricant Requirements
- Mower Fastener and Plug Tightening Torques
- Mower Maintenance Checklist
- Daily and Each-Use Mower Maintenance
- Initial 50-Hour and Periodic 50- and 150-Hour Checks
- Two-Year Mower Maintenance
- Mower Power Transmission Mechanism
- Mower Troubleshooting, Service Specifications and Tightening Torques
- Mower Checking and Adjustment
- Mower Tilt-Up and Removal Preparation
- Mower Disassembly and Assembly
- Mower Component Servicing
Drivetrain Differences, F3990 Engine Controls and Mower Service
The F2690E uses the two-wheel-drive arrangement identified in the transmission and rear axle chapters, whereas the F2690 and F3990 have four-wheel-drive mechanisms, including dual-acting overrunning and full-time 4WD functions. The hydraulic chapters also distinguish the F2690E/F2690 flow priority valve and pump service from F3990 pump and cylinder-safety-valve procedures. Select the matching model-specific circuits and assembly instructions before adjustment or disassembly.
The F3990 has additional documentation for constant RPM management, DPF regeneration and after-treatment controls, with related checks in the Electrical System chapter. The separate Mower chapter identifies four RCK-series deck models and includes maintenance, tilt-up, removal and servicing references. Consult the mower identification and the applicable operating-manual listing before using equipment-specific instructions.
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