Introduction
This manual provides comprehensive service, repair, and overhaul instructions for the Case W18, W20, and W20B Wheel Loaders. It is designed to assist technicians and owners in performing maintenance, troubleshooting, and repair procedures effectively and accurately. Adherence to the procedures outlined in this manual is crucial for maintaining equipment performance and safety.
Figure 1: Front cover of the AgPubs Service Manual for Case W18, W20, W20B Wheel Loaders, presented in a durable binder.
Understanding Manual Types
Different types of manuals serve distinct purposes. This section clarifies the primary functions of common equipment manuals:
- Service Manual: Focuses on repair, overhaul, and troubleshooting procedures. This manual falls into this category.
- Operators Manual: Provides information on basic maintenance, operational guidelines, fluid types, quantities, and adjustments.
- Parts Catalog: Contains exploded views, part names, and original equipment manufacturer (OEM) part numbers for identification and ordering.
Manual Structure and Content Overview
This service manual is organized into several series and sections, each addressing specific components or systems of the Case W18, W20, and W20B Wheel Loaders. Key sections include:
Figure 2: Excerpt from the manual's table of contents, detailing sections on General Information, Engines, Fuel System, Electrical, and Steering.
- Series 10 - General: Covers general engine specifications, decals, detailed engine specifications, maintenance and lubrication, torque charts, and noise control.
- Series 20 - Engines: Includes engine diagnostics, tune-up procedures, cylinder head, valve train, camshaft, cylinder block, sleeves, pistons, rods, crankshaft, main bearings, flywheel, oil seals, lubrication system, engine removal, installation, radiator removal, installation, air cleaner, ether injection, cooling system, turbocharger, reconditioning engine cylinder block, and turbocharger failure analysis.
- Series 30 - Fuel System: Details fuel system and filters, Roosa Master fuel injectors, engine controls, fuel lines, and electric fuel pump.
- Series 40 - Electrical: Provides electrical system specifications, troubleshooting, wiring diagrams, instrument cluster, batteries, starter, and alternators.
- Series 50 - Steering: Covers hydraulic diagram, troubleshooting, pressure check, steering control valve, flow control valve, steering cylinders, center pivot, and auxiliary steering.
Figure 3: Further sections of the manual's table of contents, including Power Train, Brakes, Hydraulics, and Mounted Equipment.
- Series 60 - Power Train: Covers Allison Powershift Transmission, maintenance, removal, installation, and troubleshooting, transmission controls, drive shafts, center bearing, universal joints, rear axle, differentials, planetaries (GKN axle for W20B, Rockwell axle for W18 and W20), and wheels and tires.
- Series 70 - Brakes: Includes general air system information, air compressor, governor, reservoir, brake valve, brake actuator, pressure reducing valve, pressure protection valve, air horn, air horn valve, alcohol evaporator, double check valve, stoplight switch, disc brakes (W20B), drum brakes (W18 and W20), and parking brake.
- Series 80 - Hydraulics: Provides general hydraulic system information, hydraulic pump, loader control valve, and cylinders.
- Series 90 - Mounted Equipment: Details air conditioning troubleshooting, system checks, air conditioning system, loader, and ROPS cab and ROPS canopy.
Setup and Navigation
This manual is provided in a binder format, allowing for easy page turning and reference during repair work. Sections are typically tabbed for quick navigation. To effectively use this manual:
- Identify the specific system or component requiring attention.
- Locate the corresponding series and section using the table of contents or section tabs.
- Refer to the detailed instructions, diagrams, and specifications within that section.
Operating and Repair Procedures
Each section provides step-by-step instructions for various tasks, often accompanied by illustrations and diagrams to clarify complex procedures. Examples include:
- Fuel System Maintenance: Instructions for cleaning fuel line screens and filters.
- Engine Component Removal/Installation: Detailed steps for tasks such as flywheel removal and installation.
- System Diagrams: Comprehensive diagrams for systems like engine lubrication and coolant, aiding in understanding flow and component placement.
- Troubleshooting Guides: Visual aids and descriptions for diagnosing issues, such as compressor damage.
- Electrical Schematics: Detailed wiring diagrams for electrical system diagnosis and repair.
- Transmission Assembly: Illustrated guides for assembling and disassembling complex components.
Figure 4: Example page illustrating fuel system cleaning procedures, including diagrams and step-by-step instructions.
Figure 5: Example page detailing the process for flywheel removal and installation, with accompanying illustrations.
Figure 6: Example page displaying detailed diagrams of the engine lubricating oil and coolant systems, indicating flow paths and components.
Figure 7: Example page providing visual examples of various types of compressor damage, useful for diagnostic purposes.
Figure 8: Example page featuring a detailed wiring diagram, essential for electrical system troubleshooting and repair.
Figure 9: Example page illustrating steps for transmission assembly, including component placement and fastening details.
Maintenance and Troubleshooting
This service manual is an indispensable tool for both routine maintenance and complex troubleshooting. It provides:
- Scheduled Maintenance: Guidelines for regular service intervals and procedures to ensure optimal performance and longevity of the wheel loader.
- Diagnostic Charts: Flowcharts and tables to help identify the root cause of operational issues.
- Repair Procedures: Detailed instructions for disassembling, inspecting, repairing, and reassembling components.
- Adjustment Specifications: Critical values for settings and tolerances to ensure components operate within manufacturer specifications.
Specifications
Technical specifications for various components and systems of the Case W18, W20, and W20B Wheel Loaders are integrated throughout the relevant sections of this manual. These specifications include, but are not limited to:
- Engine performance data and dimensions.
- Fluid capacities and types.
- Torque values for fasteners.
- Electrical system parameters.
- Component clearances and tolerances.
Always refer to the specific section pertaining to the component in question for accurate and up-to-date specifications.
Warranty and Support
This AgPubs service manual is a reproduction of the original factory-authored manual, designed for durability and clarity. For questions regarding the content or specific procedures, it is recommended to consult with a certified Case equipment technician or refer to official Case documentation. Information regarding any warranty for the manual itself would typically be provided by the retailer at the time of purchase.