Covering the F2690E, F2690, and F3990 front mowers, this Kubota workshop manual runs to 413 pages and includes the RCK60 and RCK72 deck assemblies. The hydraulic section carries full circuit schematics for both 2WD and 4WD builds; the electrical section adds wiring diagrams with color-coded connector pinouts and 20 pages of torque tables for every fastener, from engine mounts to steering. Another 100 pages walk through service procedures for the HST drivetrain, DPF regeneration, and front and rear axle rebuilds, alongside the Easy Checker™ error code routines for electrical faults. Blade mounting screws torque to 98.1 to 117.7 N·m, and the factory service codes for electronic governor work on the V1505 are spelled out. Bookmarked and keyword-searchable, it loads on a tablet so you can find the spec and get back to the machine.
What's Inside This Kubota F2690E–F3990 Package Manual
| System | Pages | Key Topics |
|---|---|---|
| I Information | - | Machine, Mower, Safety First, Before You Start Service, Start Safely, Operate Safely, Prevent a Fire, Keep a Good Airflow in the Work Area |
| G General | - | Identification (Engine and Model Serial Numbers, Cylinder Number) |
| Engine | - | Engine Body (Closed Breather, Half-Floating Head Cover), Lubricating System, Cooling System, Fuel System (Governor [D1105], Electronic Governor [V1505]) |
| Transmission | - | Structure (Four Wheel Drive, Two Wheel Drive), Power Train (Hydrostatic Transmission), Range Gear Shift Section (F2690E, F2690, F3990) |
| Front Axle | - | Structure, Troubleshooting, Tightening Torques, Checking, Disassembling and Servicing, Symptom Probable Cause Solution Reference Page, Item N·m kgf·m lbf·ft, Preparation |
| Brakes | - | Structure, Operation, During Braking, Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing |
| Rear Axle | - | Structure, Four Wheel Drive Model, Two Wheel Drive Model, Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing |
| Steering | - | Structure, Steering Controller, F2690E, F2690, F3990, Control Valve, Metering Device, Relief Valve |
| Hydraulic System | - | Hydraulic Circuit (F2690E, F2690, F3990), Hydraulic Pump (F2690E, Flow Priority Valve, Relief Valve, Implement Control Valve, Feedback Linkage, Cylinder Safety Valve |
| Electrical System | - | Wiring Diagram (F2690E, F2690, F3990), Starting System (Operator Presence Control System), Meter Panel (Easy Checker™, Service Code Display, Error Code Display) |
| Mower | - | Mower Identification, Lubricant, Tightening Torques (Metric Screws, Bolts and Nuts, American Standard Screws, Bolts and Nuts with Unc or Unf Threads, Plugs), Maintenance Check List |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| RCK60P-F39, RCK60R-F36, RCK72P-F39, RCK72R-F36 | ||
| Mower blade mounting screw torque | 98.1 to 117.7 N·m / 10.0 to 12.0 kgf·m / 72.3 to 86.8 lbf·ft | p. 401 |
| Mower belt replacement interval | Replace if damaged or worn | p. 398 |
| Belt tension pulley greasing interval | Grease if amount of grease is insufficient | p. 391 |
| Pulleys replacement condition | Replace if damaged | p. 399 |
| Spindle shafts greasing interval | Grease if amount of grease is insufficient | p. 391 |
| Mower blade sharpening/replacement condition | Sharpen or replace if worn or broken | p. 390 |
| F2690E, F2690, F3990 | ||
| Air cleaner element cleaning interval | every 100 Hr | p. 37 |
| Air cleaner element replacement interval | every 1 year | p. 37 |
| Fuel filter element check interval | every 100 Hr | p. 37 |
| Fuel filter element replacement interval | every 400 Hr | p. 37 |
| Transmission oil filter replacement interval | every 200 Hr | p. 37 |
| Transmission oil filter replacement condition (auxiliary hydraulics) | after initial 50 service hours of operation | p. 46 |
Kubota F2690E–F3990 Package Common Problems This Manual Covers
Kubota F2690 front mower deck will not engage or blades completely stop spinning under heavy load. p. 398
Inspect the drive belt and idler pulleys for wear, and replace the belt if it is damaged (page 398). Set the blade mounting screws to 98.1 to 117.7 N·m per page 401, and grease the tension pulley if it has run dry.
Manual Section: 9 MowerEngine starts hard in cold weather or cranks continuously but does not fire.
Confirm the glow plugs are getting power, then work through the fuel system. Swap the fuel filter element once it passes the 400 Hr interval on page 37. Then check the cold valve clearance and bring it to 0.145 to 0.185 mm using page 104.
Manual Section: 1 EngineHydrostatic drive feels weak, moves in jerks, or cannot move the machine at all. p. 168
Drain the transmission case and refill to the 14.0 L capacity on page 15; the F2690E, F2690, and F3990 all share this figure. Change the transmission oil filter at the 200 Hr interval, then test the hydraulic pump relief valve pressure, which should read 13.8 to 14.2 MPa per page 299.
Manual Section: 2 TransmissionMower cuts unevenly, vibrates badly, or leaves uncut strips across the turf. p. 390
Pull the deck housing covers and check the spindle shafts. Sharpen or replace the blades if they are worn or broken (page 390). Reinstall them and torque the mounting screws to 98.1 to 117.7 N·m so the deck runs without vibration and cuts level.
Manual Section: 9 MowerFrequently Asked Questions
How do I reset the Kubota F2690/F2690E/F3990 warning light?
With the Master System Warning Indicator, restart the machine first; if the fault stays, work it according to the error code on page 8-M12. The Engine Warning Indicator (F3990 only) flashes or lights on a DTC code, in which case refer to the "Diagnosis Manual V1505-T-E4 (9Y120-02490)".
What does Kubota F2690 error code mean?
On the Kubota F2690, Err 1 flags a water temperature sensor power circuit fault, Err 2 a fuel sensor power circuit fault, and Err 3 a meter panel memory reading fault. From there, check battery voltage or replace the meter panel.
What are the torque specs for Kubota F2690 mower blade bolts?
Kubota F2690 mower blade screws tighten to 98.1 to 117.7 N·m (10.0 to 12.0 kgf·m, 72.3 to 86.8 lbf·ft). Replace any blade screw that is worn or broken.
How do I reset the service reminder on a Kubota F3990?
On the Kubota F3990, a service code like "SEr 1" or "SEr 2" on the LCD means specific service work is due. "SEr 1" covers the initial 50 hours and every 200 hours after; "SEr 2" covers every 400 hours. The manual tells you to do the work but gives no procedure to manually reset the service light.
What format is this Kubota F2690E & variants manual in?
This is a 413-page searchable PDF, ready to download right away. It works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Am I able to print pages from this Kubota F2690E & variants manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Are electrical wiring diagrams included in this Kubota F2690E & variants manual?
Yes. Full electrical schematics are included, with wire colors, connector locations, and circuit descriptions.
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