Case Wheel Loader 521E TIER 3 Service Manual PDF

This workshop service manual covers the Case 521E Tier 3 wheel loader. It provides technical specifications, troubleshooting guidance, and step-by-step procedures for component removal, installation, servicing, and repair. Electrical and hydraulic schematics support diagnostics and fault tracing.

The procedures are intended for qualified service personnel. Follow the manufacturer's instructions and use the specified tools and safety precautions.

Service and Repair Coverage

The manual includes general specifications, torque settings, recommended fluids and lubricants, engine and radiator removal, stall tests, and aftercooler servicing. Detailed engine and fuel system repairs are covered by a separate engine service manual.

The electrical section covers starter and alternator replacement, batteries, instrument cluster, and electrical troubleshooting. Steering topics include pressure checks, steering cylinders, center pivot, auxiliary steering motor and pump, and joystick steering.

Power train coverage includes the transmission, front and rear axles, drive shafts, universal joints, wheels and tires, and transmission control valve. The brake section addresses hydraulic brake troubleshooting, brake pump, accumulators, and parking brake.

The hydraulic section covers system cleaning, pressure checks, troubleshooting, hydraulic schematics, loader control valve, cylinders, coupler locking valve, and ride control components.

Additional topics include mounted equipment, air conditioning and heater servicing, loader components, ROPS, cab structural frame, cab glass installation, and electrical and hydraulic schematic foldouts.

521E Wheel Loader
Service Manual
84243970 (Replaces 87728450)

Table of Contents

General Tab 1
Section Index - General 
Standard Torque Specifications 
Fluids and Lubricants 
Metric Conversion Chart 
Engines Tab 2
Section Index - Engines 
Engine and Radiator Removal and Installation 
Stall Tests 
After Cooler 
For Engine Repair, See the Engine Service Manual 
Fuel System Tab 3
Section Index - Fuel System
For Fuel System Repair, See the Engine Service Manual 
Electrical Tab 4
Section Index - Electrical 
Removal and Installation of Starter and Alternator 
Electrical Specifications and Troubleshooting 
Batteries 
Instrument Cluster 
Steering Tab 5
Section Index - Steering 
Removal and Installation of Steering Components 
Steering Specifications, Pressure Checks, and Troubleshooting 
Steering Cylinders 
Center Pivot 5006 
Auxiliary Steering Motor and Pump 
Joystick Steering
Power Train Tab 6
Section Index - Power Train 
Removal and Installation of Power Train Components
Transmission Specifications, Pressure Checks, and Troubleshooting 
Transmission 
Front Axle 
Rear Axle 
Replaces 
Drive Shafts, Center Bearing, and Universal Joints 
Wheels and Tires 
Transmission Control Valve 
Brakes Tab 7
Section Index - Brakes 
Removal and Installation of Brake Components 
Hydraulic Brake Troubleshooting 
Brake Pump 
Brake Accumulators 
Parking Brake 
Hydraulics Tab 8
Section Index - Hydraulics 
How to Read Hydraulic Schematics 
Removal and Installation of Hydraulic Components 
Hydraulic Specifications, Troubleshooting, and Pressure Checks 
Cleaning the Hydraulic System 
Loader Control Valve 
Cylinders 
Coupler Solenoid Locking Valve 
Ride Control Accumulator 
Ride Control Valve
Mounted Equipment Tab 9
Section Index - Mounted Equipment 
Air Conditioning Troubleshooting and System Checks 
Air Conditioner System Service 
Removal And Installation Of Air Conditioning And Heater Components 
Loader 
Roll Over Protective Structure (ROPS), Cab Structural Frame (CSF) 
Cab Glass Installation 
Electrical Schematic Foldouts and Hydraulic Schematic Foldout

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Printing and Customer Support

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