Kubota GR2120AU User Manual (English)

Questions and Answers:

T
Tina LawrenceAug 21, 2025
Why is my Kubota GR2120AU engine difficult to start?
- D
  Dr. Leslie ParksAug 22, 2025
  Your Kubota Lawn Mower engine might be hard to start due to several reasons. It could be that the fuel tank or fuel filter is clogged with dirt, or there's air or water in the fuel system. In winter, increased oil viscosity can slow down the engine. Another possibility is a discharged battery, which may need recharging or replacement. Check the fuel system and use oil suitable for winter conditions.
M
Michael BlankenshipAug 23, 2025
What to do if my Kubota GR2120AU starter does not function?
- J
  Jeremy FullerAug 23, 2025
  If the starter on your Kubota Lawn Mower isn't working, the battery might be discharged. Recharge the battery. Another possibility is a poor terminal connection, so improve the terminal connections. The battery life may also have expired, so replace the battery if necessary.
D
Destiny WilliamsAug 25, 2025
What to do if my Kubota GR2120AU Lawn Mower has insufficient engine power?
- R
  Rachel MorganAug 25, 2025
  If your Kubota Lawn Mower has insufficient engine power, it could be due to a clogged air cleaner element. Try replacing or cleaning the air cleaner element. Another cause might be insufficient fuel flow or poor fuel quality, so check the fuel supply and quality.
E
Elizabeth SpencerAug 26, 2025
What to do if my Kubota GR2120AU blades are scalping grass?
- J
  Jessica LyonsAug 26, 2025
  If your Kubota Lawn Mower blades are scalping the grass, consider these potential causes: the cutting height might be too low, so increase it. The blade speed could be too fast, so reduce it. Ridges or rough terrain can also cause scalping, so address those issues. Other possible factors include bent blades (replace them), low tire inflation (check and adjust), or anti-scalp rollers that aren't correctly adjusted (adjust them).
E
ejamesAug 27, 2025
How to fix uneven cut with my Kubota Lawn Mower?
- R
  Randy CarpenterAug 27, 2025
  To fix an uneven cut with your Kubota Lawn Mower, consider these factors: the mower deck might not be level, so level it. If you are moving too fast, reduce your ground speed. Dull blades can also cause an uneven cut, so sharpen or replace them. Other potential causes include improper tire inflation (check and adjust the pressure) or mower rollers that aren't adjusted correctly (adjust them).
J
josephlarsonAug 29, 2025
Why is my Kubota Lawn Mower discharge chute plugged?
- C
  Christopher RobertsAug 29, 2025
  A plugged discharge chute on your Kubota Lawn Mower can occur for several reasons: the grass may be too wet, too long, or you may be cutting too low. The engine rpm might be too low, or the ground speed might be too fast. Check for restricted airflow. Wait for grass to dry, mow at a higher height first, adjust the cutting height, increase engine rpm, reduce ground speed, and clear any obstructions affecting airflow.
T
Tracy AlvarezAug 30, 2025
How to troubleshoot excessive vibration in Kubota Lawn Mower?
- J
  jacob36Aug 30, 2025
  Excessive vibration in your Kubota Lawn Mower could be caused by debris on the mower deck or in the pulleys. Clean the mower deck and pulleys. Other potential causes include a damaged mower belt (replace it), damaged pulleys (replace them), pulleys out of alignment (realign them), or blades out of balance (balance them).
A
anna18Sep 1, 2025
Why is my Kubota GR2120AU emitting bluish white smoke?
- T
  Tanya BrewerSep 1, 2025
  If bluish white smoke is coming from the muffler of your Kubota Lawn Mower, there may be too much engine oil. Drain the excess engine oil.
N
Norman PowellSep 2, 2025
What causes streaking of uncut grass with Kubota Lawn Mower?
- L
  Lisa HarperSep 2, 2025
  Streaking of uncut grass with your Kubota Lawn Mower can be caused by several factors: ground speed may be too fast, so reduce it. Engine rpm might be too low, so increase it. The grass could be too long, so mow it at a higher height first. Dull or damaged blades can also cause streaking, so sharpen or replace them. Finally, debris in the mower deck can be a culprit, so clean the mower deck.
J
Jason RussoSep 4, 2025
What causes my Kubota Lawn Mower to load down?
- A
  alicia29Sep 4, 2025
  If your Kubota Lawn Mower is loading down the machine, it could be due to a few reasons: the engine rpm might be too low, so increase it. The ground speed could be too fast, so reduce it. Also, check for debris wrapped around the mower spindles and remove it.

Kubota GR2120AU Specifications

General

Brand	Kubota
Model	GR2120AU
Category	Lawn Mower
Language	English

Summary

ABBREVIATION LIST

UNIVERSAL SYMBOLS

KUBOTA Corporation

FOREWORD

SAFETY FIRST

DANGER

Imminent hazard, death or serious injury.

WARNING

Potential hazard, death or serious injury.

CAUTION

Potential hazard, minor or moderate injury.

IMPORTANT

Indicates equipment or property damage if instructions not followed.

NOTE

Gives helpful information.

SAFE OPERATION

BEFORE OPERATING

Instructions and checks before starting machine operation.

OPERATING

Guidelines for starting and working with the machine.

SAFE OPERATION

Pulling loads

Precautions and safety guidelines for pulling loads.

Operation on slopes

Safety measures and techniques for operating on slopes.

SAFE OPERATION

DO NOT

Prohibitions and warnings regarding machine operation.

Children

Safety precautions related to children.

Operators, age 60 years and above

Considerations for older operators.

Stopping

Steps to safely stop the machine.

USING THE PTO

USING THE LIFT LINK

TRANSPORTING

SERVICING

SAFE OPERATION

STORAGE

Procedures and precautions for storing the machine.

Waste products

Guidelines for proper disposal of waste products.

SAFE OPERATION

DANGER, WARNING AND CAUTION LABELS

Identification and explanation of safety labels on the machine.

SAFE OPERATION

WARNING Labels

Specific warning labels and their meanings.

SAFE OPERATION

Battery Safety Labels

Safety information related to battery handling and hazards.

SAFE OPERATION

Hot Surface Warnings

Warnings about hot engine components and surfaces.

SAFE OPERATION

Fuel Labels

Labels related to fuel types and safety precautions.

CARE OF DANGER, WARNING AND CAUTION LABELS

Instructions for maintaining safety labels on the machine.

SERVICING OF LAWN AND GARDEN TRACTOR

Machine Identification

Section to record machine, engine, and mower serial numbers.

Warranty

Information regarding the limited express warranty.

Scrapping the machine and its procedure

Guidelines for decommissioning and disposing of the machine.

SPECIFICATIONS

Engine Specifications

Details on engine model, displacement, power, and fuel.

SPECIFICATIONS

Machine Dimensions and Mower Specifications

Technical data on machine size, mower deck, and dimensions.

IMPLEMENT LIMITATIONS

Maximum Axle Loading Weight

Specifies maximum weight limits for front and rear axles and total vehicle weight.

IMPLEMENT LIMITATIONS

Ballast

Guidance on adding ballast for stability with specific attachments.

INSTRUMENT PANEL AND CONTROLS

Control Identification

Identifies various controls and indicators on the instrument panel.

MOWER MOUNTING

ATTACHING THE MOWER

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

MOWER MOUNTING

Front Linkage Attachment

Details on connecting the front links to the tractor and mower.

MOWER MOUNTING

ADJUSTING THE PARALLEL LINKAGE

Procedure for adjusting the parallel linkage of the mower deck.

ADJUSTING THE MOWER DECK (SIDE TO SIDE)

Instructions for adjusting the mower deck for side-to-side leveling.

MOWER MOUNTING

ADJUSTING THE MOWER LIFT STOPPERS

How to adjust the lift stoppers to balance the mower deck.

DISMOUNTING THE MOWER DECK

Steps for removing the mower deck from the tractor.

OPERATING THE ENGINE

STARTING THE ENGINE

Procedures for starting the tractor's engine.

OPERATING THE ENGINE

Key Switch Operation

Details on using the key switch for starting and stopping the engine.

OPERATING THE ENGINE

Preheating and Throttle/Choke Operation

Operation of preheating, throttle, and choke for engine starting.

OPERATING THE ENGINE

Cold Weather Starting and Block Heater

Procedures for starting in cold weather and using a block heater.

STOPPING THE ENGINE

Steps to safely shut down the engine.

OPERATING THE ENGINE

Engine Stop and Warm-up Procedures

Manual engine stop and recommended warm-up procedures.

Low Temperature Oil Warm-up

Specific warm-up for transmission oil in cold temperatures.

OPERATING THE ENGINE

JUMP STARTING

Step-by-step guide for jump starting the tractor battery.

HIGH ALTITUDE OPERATION

Considerations for operating the engine at high altitudes.

OPERATING THE MACHINE

OPERATING NEW MACHINE

Guidelines for operating a new machine to ensure longevity.

Initial Oil Change and Break-in

Recommended procedures for first oil change and machine break-in.

OPERATING THE MACHINE

Operator Position and Light Adjustment

Adjusting seat position, suspension, and light switch.

OPERATING THE MACHINE

Implement Control and Acceleration

Using the hydraulic lift lever and throttle for operation.

Parking Brake Release

How to release the parking brake.

OPERATING THE MACHINE

Speed Control and Cruise Control

Operating the speed control pedal and engaging cruise control.

OPERATING THE MACHINE

STOPPING AND DRIVING CHECKS

Procedures for stopping the machine and checks during operation.

Easy Checker System and Overheating

Understanding dashboard indicators and overheating precautions.

OPERATING THE MACHINE

Fuel and Hour Meters

Information on fuel gauge and hourmeter functions.

OPERATING THE MACHINE

Parking and Transporting Precautions

Guidelines for parking and transporting the machine safely.

Power Steering Operation

How to use and limitations of the power steering system.

OPERATING THE MACHINE

Glide Steer System

Explanation of the Glide Steer system and its function.

OPERATING THE MOWER

Mowing Techniques and Height Adjustment

Tips for effective mowing and adjusting cutting height.

OPERATING THE MOWER

Cutting Height and Roller Adjustment

Detailed steps for setting cutting height and anti-scalp rollers.

OPERATING THE MOWER

KRA System Normal Operation

How to operate the mower in the normal KRA system mode.

OPERATING THE MOWER

PTO Lever and KRA Override

Using the PTO lever and engaging the KRA system override.

OPERATING THE MOWER

KRA System Override Mode Details

Further details and warnings on the KRA system override mode.

CLEANING

Cleaning Methods

Instructions for cleaning the machine with water and the mowing system.

CLEANING

Mowing System Cleaning Notes

Additional notes for cleaning the mowing system, especially under difficult conditions.

EVERY 25 HOURS

Air Cleaner Precleaner and Paper Element Cleaning

Steps for cleaning the air cleaner precleaner and paper element.

EVERY 50 HOURS

Engine Start System Checks

Verifying the safety interlock functions of the engine start system.

EVERY 50 HOURS

OPC and PTO Control System Checks

Verifying the operation of Operator Presence Control and PTO control systems.

EVERY 50 HOURS

Air Cleaner Element Cleaning and Evacuator Valve

Detailed steps for cleaning the air cleaner element and checking the evacuator valve.

EVERY 50 HOURS

Carbon Canister Air Filter Check

How to check and clean the carbon canister air filter.

EVERY 50 HOURS

Gear Box Oil Level Check and Greasing Points

Checking gearbox oil level and identifying greasing locations.

EVERY 50 HOURS

Oiling Locations

Specific points requiring oiling for smooth operation.

EVERY 50 HOURS

Oiling Critical Linkages

Oiling points for various control linkages and pivots.

EVERY 50 HOURS

Throttle Cable Oiling

Instructions for oiling the throttle cables.

EVERY 50 HOURS

Battery Condition Check

How to check the battery's voltage and condition.

EVERY 100 HOURS

Air Cleaner Paper Element Replacement

Procedure for replacing the air cleaner paper element.

EVERY 100 HOURS

Fuel System Checks

Inspecting fuel lines, vapor lines, and fuel filter for wear and damage.

EVERY 100 HOURS

Fuel System Maintenance Details

Specific notes on fuel system maintenance and fuel recommendations.

PERIODIC SERVICE

Radiator and Screen Cleaning

How to clean the radiator and screen to prevent overheating.

Tire Pressure Check

Importance and procedure for checking tire inflation pressure.

PERIODIC SERVICE

Tire Inflation Pressure Specifications

Recommended tire inflation pressures for different tire types.

PERIODIC SERVICE

Transmission Fluid and Coolant Level Checks

Procedures for checking transmission fluid and coolant levels.

PERIODIC SERVICE

Grease Fitting Lubrication

Locations and procedure for lubricating all grease fittings.

PERIODIC SERVICE

Air Cleaner Element Cleaning

Detailed instructions for cleaning the air cleaner element and its components.

PERIODIC SERVICE

Engine Start System Safety Checks

Verifying the safety interlock functions of the engine start system.

PERIODIC SERVICE

OPC and PTO Control System Safety Tests

Performing safety tests for OPC and PTO control systems.

PERIODIC SERVICE

Carbon Canister Air Filter Check

How to check and clean the carbon canister air filter.

PERIODIC SERVICE

Transmission Fluid Change

Procedure for changing the transmission fluid and filter.

PERIODIC SERVICE

Transmission Strainer Cleaning and Front Axle Oil Change

Cleaning the transmission strainer and changing front axle case oil.

PERIODIC SERVICE

Cooling System Flush and Coolant Change

Steps for flushing the cooling system and changing the coolant.

PERIODIC SERVICE

Anti-freeze Usage and Safety

Guidelines for using anti-freeze and related safety warnings.

PERIODIC SERVICE

Replacing Hoses and Lines

Procedures for replacing hydraulic hoses, fuel lines, and other hoses.

Replacing Fuses

How to replace blown fuses in the machine's electrical system.

PERIODIC SERVICE

Replacing Bulbs and Checking Blades

Instructions for replacing light bulbs and checking mower blade condition.

PERIODIC SERVICE

Blade Replacement and Sharpening

Detailed steps for removing, sharpening, balancing, and installing mower blades.

PERIODIC SERVICE

Mower Belt Replacement

Procedure for replacing the mower deck belt.

Bleeding Fuel System

Steps to bleed air from the fuel system after filter or line replacement.

ADJUSTMENT

GENERAL TORQUE SPECIFICATION

Torque specifications for standard cap screws based on grade and size.

ADJUSTMENT

TIGHTENING TORQUE CHART

Detailed torque values for various bolt sizes and grades.

STORAGE

Long-Term Storage Preparation

Procedures for preparing the machine for storage over 2 months.

STORAGE

Removing from Storage

Steps to take when taking the machine out of storage.

TROUBLESHOOTING

Engine Troubleshooting Guide

Common engine problems and their probable causes.

Battery Troubleshooting Guide

Common battery issues and their probable causes.

TROUBLESHOOTING

Machine Operation Troubleshooting

Common problems with machine operation and their causes.

TROUBLESHOOTING

Mower Performance Troubleshooting

Troubleshooting common issues related to mower performance and cut quality.

Related product manuals

Kubota GR2120AU User Manual

Table of Contents

Questions and Answers:

Kubota GR2120AU Specifications

Summary

ABBREVIATION LIST

UNIVERSAL SYMBOLS

KUBOTA Corporation

FOREWORD

SAFETY FIRST

DANGER

WARNING

CAUTION

IMPORTANT

NOTE

SAFE OPERATION

BEFORE OPERATING

OPERATING

SAFE OPERATION

Pulling loads

Operation on slopes

SAFE OPERATION

DO NOT

Children

Operators, age 60 years and above

Stopping

USING THE PTO

USING THE LIFT LINK

TRANSPORTING

SERVICING

SAFE OPERATION

STORAGE

Waste products

SAFE OPERATION

DANGER, WARNING AND CAUTION LABELS

SAFE OPERATION

WARNING Labels

SAFE OPERATION

Battery Safety Labels

SAFE OPERATION

Hot Surface Warnings

SAFE OPERATION

Fuel Labels

CARE OF DANGER, WARNING AND CAUTION LABELS

SERVICING OF LAWN AND GARDEN TRACTOR

Machine Identification

Warranty

Scrapping the machine and its procedure

SPECIFICATIONS

Engine Specifications

SPECIFICATIONS

Machine Dimensions and Mower Specifications

IMPLEMENT LIMITATIONS

Maximum Axle Loading Weight

IMPLEMENT LIMITATIONS

Ballast

INSTRUMENT PANEL AND CONTROLS

Control Identification

MOWER MOUNTING

ATTACHING THE MOWER

MOWER MOUNTING

Front Linkage Attachment

MOWER MOUNTING

ADJUSTING THE PARALLEL LINKAGE

ADJUSTING THE MOWER DECK (SIDE TO SIDE)

MOWER MOUNTING

ADJUSTING THE MOWER LIFT STOPPERS

DISMOUNTING THE MOWER DECK

OPERATING THE ENGINE

STARTING THE ENGINE

OPERATING THE ENGINE

Key Switch Operation

OPERATING THE ENGINE

Preheating and Throttle/Choke Operation

OPERATING THE ENGINE

Cold Weather Starting and Block Heater

STOPPING THE ENGINE

OPERATING THE ENGINE

Engine Stop and Warm-up Procedures

Low Temperature Oil Warm-up