This is the operator's manual for the Kubota L3301 and L3901 compact diesel tractors, both built around the D1803-CR-E4 engine. It is the factory book Kubota supplies with the machine, covering day-to-day operation, the controls and instrument panel, the DPF exhaust aftertreatment system, and the routine service that keeps these tractors running.Inside you get the full specification tables, implement limitations, safe operating procedures, and step-by-step maintenance with the intervals and capacities Kubota calls for. It also lays out the 3-point hitch, PTO, hydraulic unit, and tire and ballast setup.Use it to run the tractor correctly, service it on schedule, torque the wheels to spec, and work through the troubleshooting and error-code charts before you call a dealer. Delivered as a downloadable, printable PDF.
What's Inside This Kubota L3301, L3901 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safe Operation | 11-22 | General Precautions, Precautions for Cab and ROPS, Precautions for Operating the Tractor on Slopes, Precautions for Driving the Tractor on the Road |
| Servicing of the Tractor | 23-24 | Dealer Service, Warranty of the Tractor, Scrapping the Tractor and Its Procedure |
| Specifications | 25-29 | Specification Table, Traveling Speeds Table, Engine Specifications, Hydraulic Unit Specifications, PTO Specifications, Dimensions and Weight |
| Implement Limitations | 30-33 | Implement Limitation Tables, Implement Weight List, Lower Link End Max. Lifting Weight, Max. Drawbar Load, Trailer Loading Weight |
| Instrument Panel and Controls | 34-46 | Instrument Panel, Switches, And Hand Controls (Head Light Switch, Turn Signal Light Switch, Hazard Light Switch, Key Switch, Easy Checker™ Lamps) |
| Pre-Operation Check | 47 | Walk-Around Inspection, Checking the Fuel Tank and Refueling, Checking the Engine Oil Level, Checking the Transmission Fluid Level, Checking the Coolant Level |
| Operating the Engine | 48-61 | Precautions for Operating the Engine, Exhaust Aftertreatment Devices, DPF Regeneration Process, Starting the Engine, Stopping the Engine, Warming Up of the Engine |
| Operating the Tractor | 62-77 | Operation of New Tractor, Operation of the Foldable ROPS (Folding the ROPS, Raising the ROPS to Upright Position), Starting the Tractor [Manual Transmission Type] |
| Power Take-Off (PTO) | 78-79 | PTO Operation, PTO Gear Shift Lever, Stationary PTO, PTO Shaft Cover and Cap |
| Point Hitch and Drawbar | 80-82 | Overview of the 3-Point Hitch and Drawbar, 3-Point Hitch (Preparations for Attaching the 3-Point Hitch Implement, Attaching Methods of 3-Point Hitch Implement), Drawbar (Length) |
| Hydraulic Unit | 83-85 | 3-Point Hitch Control System, Position Control, Float Control, Auxiliary Hydraulics |
| Tires, Wheels, and Ballast | 86-90 | Tires (Inflation Pressure of Tires, Rear Wheels), Ballast (Front Ballast, Rear Ballast, Liquid Ballast in Rear Tires, Dual Tires), Wheel Adjustment (Front Wheels) |
| Maintenance | 91-97 | Engine Oil, Engine Oil Filter, Fuel Filter, Transmission Fluid, DPF Muffler, Battery Condition |
| Periodic Service | 98-129 | Waste Disposal, Hood and Engine Side Cover |
| Storage of the Tractor | 130-131 | Bolts and Nuts, Grease, Tires Pressure, Engine Oil, Clutch, Battery |
| Troubleshooting | 132-133 | Engine Troubleshooting, Engine Error Code, Power Train Trouble Shooting |
| Options | 134 | Engine Block Heater, Front End Weights, Rear Wheel Weights, Cruise Control, Double Acting Remote Hydraulic Control Valve, Stabilizer Kit (for Lower Link) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Front wheel bolt tightening torque | 137 N⋅m (14 kgf⋅m) [100 ft⋅lbs] | p. 87 |
| Rear wheel bolt tightening torque | 215 N⋅m (22 kgf⋅m) [160 ft⋅lbs] | p. 88 |
| Air cleaner element cleaning compressed air pressure | 205 kPa (2.1 kgf/cm2) [30 psi] | p. 109 |
| Air cleaner element cleaning interval | every 100 Hr | p. 91 |
| Fuel filter replacement interval | every 400 Hr | p. 91 |
| Fuel filter tightening | tighten by hand an additional 1/2 turn only | p. 117 |
| Engine crankcase (with filter) capacity | 6.7 L (7.1 U.S.qts.) | p. 90 |
| Engine oil type | CJ-4 (DPF type engine) | p. 90 |
| Transmission case capacity [Manual transmission 2WD] | 28.0 L (7.4 U.S. gals.) | p. 90 |
| Transmission case capacity [Manual transmission 4WD] | 28.5 L (7.5 U.S. gals.) | p. 90 |
| Engine coolant capacity | 6.0 L (6.3 U.S.qts.) | p. 90 |
| Coolant type | Fresh clean soft water with antifreeze | p. 90 |
Kubota L3301, L3901 Common Problems This Manual Covers
DPF regen failure and power derate
Owners commonly report the engine losing power or entering a regeneration-related limp mode from soot loading or DPF faults. The manual explains the DPF regeneration process and how the auto and parked regen modes are meant to run.
Manual Section: Operating the Engine p. 48No-crank after clutch or transmission work
These tractors sometimes fail to crank after clutch or transmission service, usually a safety interlock or start-circuit issue. The troubleshooting charts cover engine and power train faults to help narrow it down.
Manual Section: Troubleshooting p. 132Shutdown when PTO is engaged
Intermittent shutdown when the PTO is engaged is often a safety-switch or control-linkage problem. The PTO section shows correct engagement and the gear shift lever operation so you can check for a misadjustment.
Manual Section: Power Take-Off (PTO) p. 78Overheating under load
Overheating on the L3301 and L3901 usually traces to low coolant, a clogged radiator screen, or dirty cooling fins. The maintenance section covers coolant service and the cooling components that restrict airflow when neglected.
Manual Section: Maintenance p. 91Slow or weak hydraulics
Hydraulics that move slowly or erratically point to low or contaminated fluid or air in the system. The hydraulic unit section explains the 3-point hitch control system, position and float control, and the auxiliary hydraulics.
Manual Section: Hydraulic Unit p. 83Loose or over-torqued wheel bolts
Wheel bolts that back off or are torqued unevenly cause vibration and safety concerns. The tires and wheels section gives the correct front and rear wheel bolt torque values and inflation pressures.
Manual Section: Tires, Wheels, and Ballast p. 86Frequently Asked Questions
Which tractors does this manual cover?
It covers the Kubota L3301 and L3901 compact tractors, both powered by the D1803-CR-E4 diesel engine. The specifications section lists the separate gross power ratings, 24.6 kW for the L3301 and 28.0 kW for the L3901. p. 25
What are the wheel bolt torque specs?
The tires and wheels section gives 137 N.m for the front wheel bolts and 215 N.m for the rear wheel bolts. Correct inflation pressures and ballast options are listed in the same section. p. 86
Does it explain DPF regeneration?
Yes. The Operating the Engine section walks through the exhaust aftertreatment devices and the DPF regeneration process, including auto regeneration and the inhibit mode, plus starting, stopping, and warming up the engine. p. 48
Are the maintenance intervals and capacities included?
Yes. The maintenance section lists the service tasks with intervals, such as the 400-hour engine oil and filter change, along with the oil, coolant, and fuel capacities you need for each job. p. 91
What format is this manual in?
A 139-page searchable PDF downloads the moment you check out. Open it on a laptop, tablet, or phone and take it straight to the shop floor.
Can I print this manual?
Yes. The PDF carries no DRM, so print any page or section you need. It works with any standard printer.
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