Part of the Case Repair Manuals.
This is the complete factory service manual for the Case 621D wheel loader. It is organized into major service groups and covers the machine from the engine and radiator, through the fuel and electrical systems, the steering with its priority and control valves, the power train with the transmission and front and rear axles, the brakes with accumulators, and the loader hydraulics with the loader control valve, ride control, and quick coupler. It carries torque specifications, transmission, steering, and hydraulic specifications with pressure checks, troubleshooting, and electrical and hydraulic schematic foldouts. Many sections are split by PIN (serial number) so the procedures match exactly what is fitted to your machine.
What's Inside This Case 621D Manual
| System | Pages | Key Topics |
|---|---|---|
| General | Standard Torque Specifications, Fluids and Lubricants, Metric Conversion Chart | |
| Engines | Engine and Radiator Removal and Installation, Stall Tests | |
| Fuel System | Fuel System Service and Filters | |
| Electrical | Removal and Installation of Starter and Alternator, Electrical Specifications and Troubleshooting, Batteries, Information and Diagnostic Center, Alternator (45 and 65 Ampere) | |
| Steering | Removal and Installation of Steering Components, Steering Specifications Pressure Checks and Troubleshooting, Steering Control Valve, Steering Priority Valve, Steering Cylinders, Center Pivot, Auxiliary Steering Motor and Pump | |
| Power Train | Removal and Installation of Power Train Components, Transmission Specifications Pressure Checks and Troubleshooting, Transmission, Front and Rear Axle, Drive Shafts Center Bearing and Universal Joints, Wheels and Tires, Transmission Control Valve | |
| Brakes | Removal and Installation of Brake Components, Hydraulic Brake Troubleshooting, Brake Accumulators, Parking Brake | |
| Hydraulics | Removal and Installation of Hydraulic Components, Hydraulic Specifications Troubleshooting and Pressure Checks, Cleaning the Hydraulic System, Loader Control Valve, Cylinders, Coupler Solenoid Locking Valve, Pilot Pressure and Ride Control Accumulator, Ride Control Valve | |
| Mounted Equipment | Pedals and Levers, Refrigerant and HFC-134a, Air Conditioner System Service, Loader, ROPS Cab and Canopy, Cab Glass Installation | |
| Schematic Foldouts | Electrical Schematic Foldouts, Hydraulic Schematic Foldout (with PIN-specific Variants) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Machine | Wheel loader with center pivot articulated steering | |
| Transmission | Powershift with transmission control valve | |
| Loader Hydraulics | Loader control valve with ride control and quick coupler | |
| Specifications and Pressure Checks | Transmission, steering, and hydraulic specifications with pressure checks in each group |
