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Kubota GR2120 - User Manual

Kubota GR2120
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GR2020G
GR2120
GR2120AU
MODELS
OPERATOR'S MANUAL
1BDAHAOAP0580
Code No. K1270-7122-1
AS . D . 1 - 1 . - . AK
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PRINTED IN U.S.A.
©
KUBOTA Corporation 2014
READ AND SAVE THIS MANUAL

Table of Contents

Questions and Answers

  • D
    Deborah WardSep 8, 2025
    Why does my Kubota Lawn Mower belt keep slipping?
    • M
      Michael RomanSep 8, 2025
      If the belt on your Kubota Lawn Mower is slipping, the belt tension might be incorrect. Adjust the belt tension. Another cause could be a plugged mower deck, so clear the mower deck. Also, check for debris in the pulleys and clean them. Finally, a worn belt can cause slipping, so replace the belt if necessary.
  • N
    Nancy ElliottAug 23, 2025
    What to do if my Kubota GR2120 starter does not function?
    • D
      dana59Aug 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.
  • E
    Erin GomezAug 25, 2025
    What to do if my Kubota GR2120 Lawn Mower has insufficient engine power?
    • B
      Bianca RodriguezAug 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.
  • M
    Michael Parker Jr.Aug 26, 2025
    What to do if my Kubota GR2120 Lawn Mower blades are scalping grass?
    • M
      Mary WhiteAug 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).
  • T
    Tina PayneAug 27, 2025
    How to fix uneven cut with my Kubota Lawn Mower?
    • E
      elizabeth32Aug 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
    Jeremy HoodSep 22, 2025
    Why does my Kubota Lawn Mower have a larger turn radius?
    • C
      Carrie ReyesSep 22, 2025
      If your Kubota Lawn Mower has a larger turn radius or causes turf damage due to an inside rear axle issue, the glide steer system might not be correctly adjusted. Adjust the glide steer system.
  • A
    Andrea WongSep 16, 2025
    Why does my Kubota GR2120 Lawn Mower not move when running?
    • C
      cruzcherylSep 16, 2025
      If your Kubota Lawn Mower doesn't move while the engine is running, check if the parking brake is on. Release the parking brake. If that's not it, the transmission oil might be insufficient, so refill the transmission oil.
  • J
    Joseph HarrisSep 18, 2025
    Why does my Kubota GR2120 Lawn Mower move without pressing the speed control pedal?
    • A
      Aaron MorganSep 18, 2025
      If your Kubota Lawn Mower moves when the speed control pedal is not depressed, the hydrostatic neutral system might not be correctly adjusted. Adjust the hydrostatic neutral system.
  • J
    Jeffrey WalkerSep 7, 2025
    Why is my Kubota GR2120 overheating?
    • B
      Briana MaySep 7, 2025
      If your Kubota Lawn Mower (GR2120, GR2120AU) is overheating, it could be due to low coolant level. Refill coolant to the appropriate level. A loose or defective fan belt can also cause overheating; tighten or replace the fan belt. Another cause could be a corroded coolant flow route; repair or replace the corroded components. For GR2020G models, cooling fan trouble may be the cause; check and repair the cooling fan.
  • S
    Shane SilvaSep 4, 2025
    What causes my Kubota GR2120 Lawn Mower to load down?
    • L
      Linda MackSep 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.

Summary

ABBREVIATION LIST

UNIVERSAL SYMBOLS

FOREWORD

SAFE OPERATION

BEFORE OPERATING

Essential pre-operation checks and familiarization procedures.

STARTING AND WORKING SAFELY

Procedures for starting the engine and safe operating practices.

OPERATING ON SLOPES AND LOADS

Guidelines for safe operation on inclines and when pulling loads.

DO NOT OPERATE GUIDELINES

Critical prohibitions and actions to avoid during operation.

COMPONENT SAFETY PRECAUTIONS

Safety procedures for using PTO and lift link systems.

TRANSPORTING AND SERVICING SAFETY

Safety measures for moving and maintaining the machine.

DANGER, WARNING AND CAUTION LABELS

Identification and understanding of safety labels on the machine.

SERVICING OF LAWN AND GARDEN TRACTOR

SPECIFICATIONS

IMPLEMENT LIMITATIONS

BALLAST GUIDELINES

Recommendations for adding ballast for stability with attachments.

INSTRUMENT PANEL AND CONTROLS

MOWER MOUNTING

ATTACHING THE MOWER

Step-by-step guide for connecting the mower deck.

ADJUSTING THE MOWER DECK

Procedures for parallel linkage and side-to-side deck alignment.

MOWER LIFT STOPPER ADJUSTMENT

Adjusting the stoppers for proper mower deck leveling.

DISMOUNTING THE MOWER DECK

Steps for removing the mower deck from the tractor.

OPERATING THE ENGINE

STARTING THE ENGINE

Step-by-step guide for starting the engine safely.

STOPPING THE ENGINE

Procedures for safely shutting down the engine.

WARMING UP PROCEDURES

Recommended engine warm-up sequences based on temperature.

JUMP STARTING

Safe procedure for jump-starting a dead battery.

HIGH ALTITUDE OPERATION

Considerations for operating the engine at high altitudes.

OPERATING THE MACHINE

OPERATING A NEW MACHINE

Guidelines for breaking in a new machine for longevity.

STARTING PROCEDURES

Steps for preparing to operate the machine, including seat and controls.

DRIVING AND CONTROLS

Operation of speed control and cruise control systems.

STOPPING AND CHECKS

Procedures for stopping and critical checks during operation.

GAUGES AND FUEL MANAGEMENT

Understanding fuel gauge and hourmeter, proper refueling.

PARKING AND TRANSPORTING

Safe procedures for parking and transporting the machine.

GLIDE STEER OPERATION

How the Glide Steer system functions and its benefits.

PERIODIC SERVICE

DAILY CHECKS

Essential checks performed before each operation.

ROUTINE MAINTENANCE (25-100 HOURS)

Maintenance tasks required at 25, 50, and 100-hour intervals.

MAJOR SERVICE INTERVALS (150-400 HOURS)

Maintenance tasks required at 150, 200, and 400-hour intervals.

EXTENDED INTERVAL MAINTENANCE (1-2 YEARS)

Maintenance tasks performed annually or every two years.

SERVICE AS REQUIRED

Tasks performed based on condition rather than hours.

ADJUSTMENT

GENERAL TORQUE SPECIFICATION

Standard torque values for various fastener types.

TIGHTENING TORQUE CHART

Specific torque values for common fasteners.

STORAGE

TROUBLESHOOTING

ENGINE ISSUES

Common engine starting, running, and overheating problems.

BATTERY ISSUES

Troubleshooting common battery performance and charging problems.

MACHINE OPERATION PROBLEMS

Issues related to machine movement and control systems.

MOWER PERFORMANCE ISSUES

Troubleshooting problems related to mowing quality and deck operation.

INDEX

Kubota GR2120 Specifications

General IconGeneral
TransmissionHydrostatic
Cutting Width48 inches
Drive Type4WD
SteeringPower steering
BrakesWet disc
Deck MaterialSteel
TypeRiding Lawn Mower
Engine Type3-cylinder diesel
Engine Power21 HP
Cutting Height1-4 inches (2.5-10.2 cm)
Mower DeckFabricated

Videos

How to Replace the Fan Belt on a Kubota GR2120 Lawnmower

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