Part of the Case Repair Manuals.
This is the complete Case factory service manual for the 621C and 721C wheel loaders. It is organized into the standard Case service groups, General, Engines, Electrical, Steering, Power Train, Brakes, Hydraulics, and Mounted Equipment, and it includes the electrical schematics and wiring coverage. Each group carries specifications, pressure checks, troubleshooting, and step-by-step removal, disassembly, inspection, assembly, and installation procedures, including the air conditioning system, the ride-control hydraulics, and the Information and Diagnostics Center, for both the 621C and 721C.
Other editions of this manual
What's Inside This Case 621C, 721C, 621C/721C Manual
| System | Pages | Key Topics |
|---|---|---|
| General | Standard Torque Specifications, Fluids and Lubricants | |
| Engines | Engine and Radiator Removal and Installation, Stall Tests | |
| Electrical | Removal and Installation of Starter and Alternator, Electrical Specifications, Troubleshooting, And Schematics, Battery(S), Starter and Starter Solenoid, Information and Diagnostics Center, Alternator | |
| Steering | Removal and Installation of Steering Components, Steering Specifications, Pressure Checks, And Troubleshooting, Steering Control Valve, Steering Priority Valve, Steering Cylinder, Center Pivot | |
| Power Train | Transmission Specifications, Pressure Check, And Troubleshooting, Transmission, Drive Shaft, Center Bearing, And Universal Joints, Wheels and Tires, Transmission Control Valve | |
| Brakes | Removal and Installation of Brake Components, Hydraulic Brake Troubleshooting, Brake Accumulators, Brake Actuator Valve, Brake Accumulator Valve, Parking Brake | |
| Hydraulics | Removal and Installation of Hydraulic Components, Hydraulic Specifications, Troubleshooting, And Pressure Checks, Cleaning the Hydraulic System, Hydraulic Pump, Loader Control Valve, Cylinders, Coupler Lock Valve, Remote Control Valves, Combination Valve, Accumulator for Ride Control, Solenoid Valve and Accumulator Valve for Ride Control | |
| Mounted Equipment | Pedals and Levers, Air Conditioning Troubleshooting and System Checks, For Systems Wi, Air Conditioner System Service, Removal and Installation of Air Conditioning Components, For Syste, Air Conditioning Compressor and Clutch, Loader, ROPS Cab and ROPS Canopy, Cab Glass Installation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Low brake pressure warning switch actuation pressure | 110 to 124 bar (1600 to 1800 psi) | p. 505 |
| Engine oil pressure warning actuation threshold | below 100 kPa (14.5 PSI) | p. 221 |
| Standard Torque, Grade 8 Bolts, 1/4 inch | 144 to 180 pound-inches | p. 8 |
| Batteries Cold Cranking Capacity at 0°F | 800 amperes | p. 75 |
| Alternator Output | 28 volts at 65 amperes | p. 234 |
| Steering Relief Valve Pressure Setting | 184 to 193 bar (2665 to 2800 psi) | p. 256 |
| Transmission Main Pressure and Clutch Pressure | 16 to 18 bar (230 to 265 psi) | p. 297 |
| Ride Control Accumulator Dry Nitrogen Pressure | 31 ±1.7 bar (450 ±25 psi) | p. 699 |
| Air Conditioning System Refrigerant Capacity | 1.6 kg (3.5 lbs) | p. 748 |
| 621C/721C | ||
| Number of Teeth on Flywheel | 127 | p. 51 |
| 621C/921C | ||
| Brake Pump Output | 27.4 L/min at 172 bar | p. 505 |
