Kubota G21LD / G21HD User Manual

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G21LD,G21HD

WORKSHOP MANUAL

KiSC issued 08, 2007 A

Table of Contents

Questions and Answers:

X
xmooreAug 17, 2025
Why won't my Kubota Tractor engine start?
- K
  Kevin RayAug 18, 2025
  Your Kubota Tractor engine might fail to start due to several reasons. It could be due to no fuel, in which case you should replenish the fuel. Alternatively, there might be air or water in the fuel system, requiring you to bleed or change the fuel system, respectively. A clogged fuel pipe or filter could also be the culprit, so clean the pipe or replace the filter. Other potential causes include excessively high fuel or engine oil viscosity, low cetane fuel, a fuel leak, incorrect injection timing, a worn fuel camshaft, a clogged injection nozzle, a malfunctioning injection pump, seizure of engine components, compression leak, improper valve timing, or worn piston rings and cylinder, or excessive valve clearance.
J
Jesse WalkerAug 20, 2025
What to do if my Kubota G21LD / G21HD engine is overheating?
- L
  Lori KramerAug 20, 2025
  If your Kubota Tractor's engine is overheating, it could be due to several reasons. Check if the engine oil or cooling water levels are insufficient and replenish if needed. The fan belt might be broken or improperly tensioned, requiring replacement or adjustment. The radiator net and fin could be clogged with dust, so clean them. The inside of the radiator or the cooling water flow route might be corroded, necessitating cleaning or replacement. A defective radiator cap, overload running, a defective head gasket, incorrect injection timing, or unsuitable fuel could also be the cause.
P
Paul GonzalezAug 23, 2025
What causes black or dark gray exhaust gas from Kubota G21LD / G21HD Tractor?
- R
  Rachel CooperAug 23, 2025
  Black or dark gray exhaust gas from your Kubota Tractor could be caused by an overload (lessen the load), use of low-grade fuel (use specified fuel), a clogged fuel filter (replace it), a clogged air cleaner (clean or replace the element), or deficient nozzle injection (repair or replace the nozzle).
J
Jesse BrownAug 26, 2025
What to do if my Kubota G21LD / G21HD engine does not start and the starter does not run?
- S
  Spencer EvansAug 26, 2025
  If your Kubota Tractor engine doesn't start and the starter motor isn't running, the issue could stem from a discharged battery (charge it), a malfunctioning starter (repair or replace it), or a blown slow blow fuse (replace it). Other potential causes include a malfunctioning main switch (repair or replace), a defective PTO, brake, or seat switch (replace each), or a disconnected wiring harness (connect it).
Q
qmendozaAug 27, 2025
What causes white or blue exhaust gas from Kubota G21LD / G21HD Tractor?
- D
  Diana TaylorAug 27, 2025
  White or blue exhaust gas from your Kubota Tractor might be due to excessive engine oil (reduce to the specified level), worn or stuck piston rings and cylinders (repair piston ring and bore oversize piston), incorrect injection timing (adjust injection timing), or deficient compression (adjust top clearance).
A
Andres FosterAug 30, 2025
What causes low oil pressure in my Kubota Tractor?
- C
  Cheryl Campos MDAug 30, 2025
  Low oil pressure in your Kubota Tractor can occur due to several reasons. The engine oil might be insufficient, so replenish it. The oil strainer or engine oil filter cartridge could be clogged, requiring cleaning or replacement, respectively. A relief valve stuck with dirt, or a weakened/broken relief valve spring should be replaced. Excessive oil clearance in the crankshaft or crankpin bearing requires replacement of main or crankpin bearings. Excessive oil clearance of rocker arm, a clogged oil passage, using a different type of oil, or a defective oil pump can also cause low oil pressure.
J
Jeremy RyanSep 2, 2025
Why is my Kubota G21LD / G21HD Tractor engine revolution not smooth?
- R
  Randall WardSep 2, 2025
  An unsmooth engine revolution in your Kubota Tractor could stem from a clogged or dirty fuel filter (replace it), a clogged air cleaner (clean or replace the element), a fuel leak due to a loose injection pipe retaining nut (tighten the nut), a malfunctioning injection pump (repair or replace it), incorrect nozzle injection pressure (adjust it), a stuck or clogged injection nozzle (repair or replace it), or a malfunctioning governor (repair it).
T
Todd ParrishSep 4, 2025
What causes deficient output in Kubota Tractor?
- K
  Karen ShepherdSep 4, 2025
  Deficient output in your Kubota Tractor can be attributed to incorrect injection timing (adjust it), seized engine moving parts (repair or replace them), uneven fuel injection (repair or replace the injection pump), deficient nozzle injection (repair or replace the nozzle), or a compression leak from the cylinder (replace the head gasket, and tighten the cylinder head screws, glow plugs, and nozzle holders).
R
Robert JohnstonSep 7, 2025
What causes high oil pressure in Kubota G21LD / G21HD Tractor?
- J
  jerryarnoldSep 7, 2025
  High oil pressure in your Kubota Tractor may be caused by using a different type of oil (use the specified type) or a defective relief valve (replace it).
S
sarah02Sep 9, 2025
What causes excessive lubricant oil consumption in Kubota G21LD / G21HD?
- F
  Frederick HowellSep 9, 2025
  Excessive lubricant oil consumption in your Kubota Tractor may occur if the piston ring gap is facing the same direction (shift the ring gap direction), the oil ring is worn or stuck (replace the oil ring), the piston ring groove is worn (replace the piston), the valve stem and valve guide are worn (replace them), or if there's oil leaking due to defective seals or packing (replace them).

Kubota G21LD / G21HD Specifications

General

Brand	Kubota
Model	G21LD / G21HD
Category	Tractor
Language	English

Summary

To the Reader

General Information

Introduction to manual structure, safety, and general information about the machine.

Mechanism

Explanation of the machine's construction and how its systems function.

Servicing

Detailed procedures for maintenance, repair, and technical specifications.

Safety Instructions

Safety First

General safety warnings and precautions to prevent personal injury.

Safety Starting

Procedures and precautions for safely starting the engine.

Safety Working

Guidelines for safe practices while working on the machine.

Avoid Fires

Precautions to prevent fire hazards, including fuel handling.

Ventilate Work Area

Importance of ventilation to prevent carbon monoxide exposure.

Prevent Acid Burns

Safety measures for handling battery electrolyte.

Dispose of Fluids Properly

Environmental guidelines for responsible fluid disposal.

Safety Decals

Specifications

Dimensions

General

Identification

Locating serial numbers and hour meter on the machine.

General Precautions

Essential guidelines for safe disassembly and parts handling.

Lubricants, Fuel and Coolant

Specifications for fluids and lubricants required for maintenance.

Tightening Torques

Specified torque values for critical fasteners.

Maintenance Check List

Schedule of regular maintenance tasks based on operating hours.

Check and Maintenance

Procedures for routine checks and maintenance tasks.

Servicing (Engine)

Troubleshooting (Engine)

Diagnostic guide for common engine problems, causes, and solutions.

Servicing Specifications (Engine)

Technical data and allowable limits for engine components.

Tightening Torques (Engine)

Specified torque values for engine assembly fasteners.

Checking, Disassembling and Servicing (Engine)

Procedures for engine inspection, disassembly, and servicing.

Transmission and Rear Axle

Mechanism (Transmission)

Explanation of the construction and function of transmission components.

Servicing (Transmission)

Procedures for troubleshooting, specifications, and maintenance of the transmission.

Brakes

Servicing (Brakes)

Procedures for troubleshooting, specifications, and maintenance of the brake system.

Front Axle

Servicing (Front Axle)

Procedures for troubleshooting, specifications, and maintenance of the front axle.

Steering

Mechanism (Steering)

Explanation of the electric power steering system's configuration and components.

Servicing (Steering)

Procedures for troubleshooting, specifications, and servicing the steering system.

Hydraulic System

Mechanism (Hydraulic)

Explanation of hydraulic circuits and component functions.

Servicing (Hydraulic System)

Procedures for troubleshooting, specifications, and maintenance of hydraulic systems.

Mower

Servicing (Mower)

Procedures for troubleshooting, specifications, and maintenance of the mower deck.

Electrical System

Mechanism (Electrical)

Wiring diagrams and electrical circuit explanations.

Servicing (Electrical System)

Procedures for troubleshooting, specifications, and maintenance of electrical components.

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