Kubota F3990 User Manual

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F2890

F3690

MODELS

OPERATOR'S MANUAL

1BDAIAZAP0010

English (AUS)

Code No. K3603-6291-1

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PRINTED IN JAPAN

©

KUBOTA Corporation 2013

READ AND SAVE THIS MANUAL

Table of Contents

Questions and Answers:

J
James PriceAug 13, 2025
Why is my Kubota Lawn Mower engine difficult to start?
- R
  Robert GilmoreAug 13, 2025
  If your Kubota Lawn Mower engine is hard to start or won't start, here's what to check: * **Fuel:** Make sure you have enough fuel. Check the fuel tank and fuel filter, replacing the filter if needed. * **Fuel System:** If air or water is in the fuel system, tighten the fuel line coupler bolt and nut. Bleed the fuel system. * **Oil Viscosity:** In winter, use oils of different viscosities depending on the temperature. Consider using an engine block heater. * **Battery:** Clean the battery cables and terminals. Charge the battery. In cold weather, remove the battery, charge it, and store it indoors, installing it only when you're ready to use the machine.
S
Scott MooreAug 16, 2025
Why from beginning starter does not function, and lights soon become dim on Kubota F3990 Lawn Mower?
- S
  Susan PadillaAug 16, 2025
  If the starter doesn't function from the beginning and the lights soon become dim on your Kubota Lawn Mower, it indicates insufficient charging. Charge the battery sufficiently.
L
Lisa MonroeAug 20, 2025
Why is my Kubota Lawn Mower engine overheating?
- B
  Barbara MartinezAug 20, 2025
  If your Kubota Lawn Mower engine overheats, consider these potential causes and solutions: * **Engine Overload:** Shift to a lower gear or reduce the load. * **Low Coolant:** Fill the cooling system to the correct level and inspect the radiator and hoses for leaks. * **Fan Belt:** Adjust or replace the fan belt if it's loose or defective. * **Dirty Screen:** Remove any trash from the radiator or bonnet screen. * **Coolant Flow:** Flush the cooling system if the coolant flow route is corroded.
C
Cathy MorrisonAug 25, 2025
Why are the exhaust fumes colored on my Kubota Lawn Mower?
- F
  frederickandersonAug 25, 2025
  If the exhaust fumes from your Kubota Lawn Mower are colored, it could be due to several reasons: * **Fuel Quality:** Poor fuel quality can cause this. Change the fuel and fuel filter. * **Oil Level:** Too much oil can also be a factor. Check the proper amount of oil. * **Air Cleaner:** A clogged air cleaner might be the problem. Clean or replace the element. * **Other issues:** If the inside of the exhaust muffler is filled with fuel, heat the muffler by applying a load to the engine. Problems with the injection nozzle or poor fuel quality can also contribute. Check the injection nozzle and change the fuel and fuel filter.
L
Lisa KennedyAug 28, 2025
What to do if Kubota F3990 Lawn Mower does not move while engine is running?
- C
  Courtney LuceroAug 28, 2025
  If your Kubota Lawn Mower doesn't move while the engine is running, check if the parking brake is on and release it. Also, verify the transmission fluid level and replenish oil if it's insufficient.
D
David ThompsonSep 1, 2025
Why are Kubota F3990 Lawn Mower terminals severely corroded and heat up?
- R
  Robert FrankSep 1, 2025
  If the terminals of your Kubota Lawn Mower are severely corroded and heat up, it's likely due to a poor terminal connection. Clean the terminal and tighten it securely.
B
Bryan WarnerSep 4, 2025
Why when viewed from top, the top of plates looks whitish on Kubota Lawn Mower?
- H
  hwongSep 4, 2025
  If the top of the plates looks whitish when viewed from the top on your Kubota Lawn Mower, it could be because the battery was used with an insufficient amount of electrolyte or used too much without recharging. Add distilled water and charge the battery, or charge the battery sufficiently.
R
rachelmillsSep 8, 2025
Why battery electrolyte level drops rapidly on Kubota Lawn Mower?
- R
  Robert MitchellSep 8, 2025
  If the battery electrolyte level drops rapidly in your Kubota Lawn Mower, it suggests there's a crack or pinholes in the electrolytic cells. Replace the battery.

Kubota F3990 Specifications

General

Transmission	Hydrostatic
Drive System	4WD
Engine Type	Diesel, liquid-cooled
Cutting Width	72 inches
Displacement	111.4 cu in (1.8 L)
Speed Range	0-10.5 mph (0-17 km/h)

Summary

MOWER MOUNTING

Mounting the Mower Deck

Step-by-step instructions for attaching the mower deck to the machine.

PRE-OPERATION CHECK

Daily Checks

Routine checks to perform before operating the machine daily.

OPERATING THE ENGINE

Starting the Engine

Procedure and safety checks for starting the engine.

Stopping the Engine

Correct procedure for shutting down the engine safely.

SAFE OPERATION

Before Operating

Essential checks and precautions before starting machine operation.

Operation on Slopes

Specific precautions and techniques for operating on inclines to prevent accidents.

INSTRUMENT PANEL AND CONTROLS

Hand Controls and Switches

Identification and location of various levers, switches, and indicators.

Instrument Panel Display

Explanation of the liquid crystal display and its various indicators.

PERIODIC SERVICE

Daily Check

Performing essential checks before operating the machine.

Checking Seat Belt and ROPS

Ensuring the safety belt and Roll-Over Protective Structure are secure.

Checking Engine Oil Level

Procedure for checking and maintaining the engine oil level.

EVERY 50 HOURS

Checking Engine Start System

Periodic tests to ensure the engine start system functions correctly.

Checking OPC System

Testing the Operator Presence Control system for safety.

EVERY 100 HOURS

Checking Battery Condition

Battery Charging

Checking Fuel Lines and Fuel Filter

Periodic Fuel System Checks

Checking and Adjusting Brake Pedal

Brake Pedal Adjustment

EVERY 200 HOURS

Changing Engine Oil

EVERY 400 HOURS

Changing Transmission Fluid

EVERY 2 YEARS

Flush Cooling System and Changing Coolant

Anti-freeze Precautions

SERVICE AS REQUIRED

Replacing Fuses

Bleeding Fuel System

Fuel System Bleeding Procedure

STORAGE

Preparing for Storage

TROUBLESHOOTING

Engine Troubleshooting

Diagnosing and resolving common engine problems.

Power Train Troubleshooting

Troubleshooting issues related to the power train and error codes.

BATTERY TROUBLESHOOTING

Starter Not Functioning

Recharging Issues

MACHINE TROUBLESHOOTING

Smooth Operation Issues

Movement Issues

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