Kubota R420A R520A R420S R520S Minor Change Version Workshop Manual Wheel Loader manuals in PDF


Factory Workshop Manual for Kubota R420A, R520A, R420S, R520S Tractors. Illustrations, instructions, diagrams for step by step remove and install, assembly and disassembly, service, inspection, repair, troubleshooting, tune-ups.

Photo 9 - Kubota R420A R520A R420S R520S Minor Change Version Workshop Manual Wheel Loader
Kubota R420A R520A R420S R520S Minor Change Version Workshop Manual Wheel Loader $19.95
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Kubota R420A R520A R420S R520S Minor Change Version Workshop Manual Wheel Loader

The Kubota R420A R520A R420S R520S Minor Change Version Workshop Manual Wheel Loader is an essential guide for anyone involved in the maintenance and repair of Kubota wheel loaders. This comprehensive factory workshop manual, formatted in PDF, spans 820 pages and is meticulously structured to facilitate a clear understanding of each component and procedure. It includes detailed illustrations, step-by-step instructions, and diagrams for the removal, installation, assembly, disassembly, service, inspection, repair, troubleshooting, and tune-ups of these models. Written in English, the manual is fully searchable and equipped with bookmarks for easy navigation, along with detailed wiring and hydraulic diagrams.

Models Covered

  • Kubota Wheel Loader Minor Change Version
    • R420A
    • R520A
    • R420S
    • R520S

Contents Overview


  • Body and Engine Identification Marks: Provides clear identification marks for the body and engine, essential for accurate servicing.
  • Safety Precautions: Outlines important safety precautions for servicing, disassembly, and reassembly to ensure safe operations.
  • Inspection Items: Highlights critical inspection items to be checked post-reassembly.
  • Service Fundamentals: Covers the basic principles and fundamentals of servicing wheel loaders.

Machine Body

  • Machine Specifications: Detailed specifications for each model, ensuring that users have all the necessary technical data.
  • Development Concept of Model Change: Explains the development and concept behind the minor changes in the models.
  • Quality Specifications: Detailed quality specifications for R420S and R520S models.
  • Front Attachment and Frame Articulation: Covers the front attachment, frame articulation, and center pin details.

Machine Body & Front Attachment-Service

  • Installing Frame-Related Parts: Step-by-step instructions for installing frame-related parts, including the front and rear frames and center pins.
  • Control Levers: Detailed assembly drawings and installation instructions for control levers.
  • Accelerator and Brake Systems: Assembly drawings and installation instructions for accelerator and brake systems, including the brake and inching-related parts.


  • Engine Specifications: Detailed specifications and performance curves for the engines.
  • Emissions Control Engines: Information on new emissions control engines, boost compensators, and governors.
  • Engine Assembly Dismounting: Instructions for dismounting and servicing engine assemblies and accessories, including turbochargers.

Hydraulic System

  • Circuit Diagram & Components: Comprehensive circuit diagrams and detailed descriptions of hydraulic system components.
  • Testing and Servicing: Detailed procedures for testing and servicing the hydraulic system.
  • Troubleshooting: Extensive troubleshooting guides to diagnose and fix hydraulic system issues.

Brake System and Power Train

  • Parking and Service Brakes: Detailed information on parking brakes and service brakes, including axle brakes for various versions.
  • Negative Brake Releasing Method: Instructions for the negative brake releasing method.
  • Power Train Components: Detailed descriptions and servicing instructions for power train components.

Electrical System

  • Testing and Troubleshooting: Detailed testing and troubleshooting procedures for the electrical system.
  • Wire Harness Installation: Instructions for installing wire harnesses and specifications for electrical components.


  • Oil Flow Chart and Hydraulic Circuit Diagram: Detailed diagrams for the backhoe oil flow and hydraulic circuits.
  • Operation and Maintenance: Instructions for the operation, maintenance, testing, adjustment, and reassembly of backhoe components.


  • Fundamentals of Wheel Loader: An introduction to the fundamentals of wheel loaders, including the Lst and steering systems.
  • Circuit Functions: Detailed descriptions of various electrical circuit functions, including winker and hazard priority circuits.

This workshop manual is an invaluable resource for technicians, mechanics, and owners of Kubota R420A, R520A, R420S, and R520S wheel loaders. It provides all the necessary information and instructions to ensure proper maintenance, efficient repairs, and optimal performance of these versatile machines. With its comprehensive coverage and detailed instructions, this manual is designed to make servicing and repairing your Kubota wheel loader a straightforward and effective process.


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