Part of the Case Repair Manuals.
This is the complete factory repair manual for the Case 621B and 721B wheel loaders. It is organized into the standard Case service groups and covers the machine from the turbocharged diesel engines, the 6T-590 in the 621B and the 6T-830 in the 721B, with their specification details, cylinder head and valve train, cylinder block, lubrication and cooling systems, and turbocharger, through the fuel and electrical systems, the steering, the power train with the transmission and axles, the brakes, and the loader hydraulics, plus the chassis. It carries standard torque specifications, fluids and lubricants, stall tests, pressure checks, troubleshooting, and step-by-step removal and installation, with the engine and many other sections split by model so the procedures match your machine.
What's Inside This Case 621B, 721B Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General | Standard Torque Specifications, Fluids and Lubricants, Loctite Product Chart | |
| Engines | Engine and Radiator Removal and Installation per Model, Stall Tests, 6T-590 (621B) and 6T-830 (721B) Specification Details, Cylinder Head and Valve Train, Cylinder Block, Lubrication System, Cooling System, Turbocharger | |
| Fuel System | Fuel System and Filters, Injection Pump, Fuel Injectors, Fuel Tank | |
| Electrical | Electrical Specifications and Troubleshooting, Batteries, Starter, Alternator, Instrument Cluster, Wiring | |
| Steering | Steering Specifications Pressure Checks and Troubleshooting, Steering Control Valve, Steering Cylinders, Priority Valve, Center Pivot | |
| Power Train | Transmission Specifications Pressure Checks and Troubleshooting, Transmission, Front and Rear Axles, Drive Shafts, Wheels and Tires, Transmission Control Valve | |
| Brakes | Brake Specifications and Troubleshooting, Brake Components, Accumulators, Parking Brake | |
| Hydraulics | Hydraulic Specifications Troubleshooting and Pressure Checks, Cleaning the Hydraulic System, Hydraulic Pump, Loader Control Valve, Cylinders, Pilot and Ride Control | |
| Chassis | Loader, ROPS Cab, Air Conditioning, Operator Platform, Mounted Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 621B | ||
| Engine (621B) | 6T-590 turbocharged diesel | |
| 721B | ||
| Engine (721B) | 6T-830 turbocharged diesel | |
| 621B, 721B | ||
| Transmission | Powershift with transmission control valve | |
| Steering | Center-pivot articulated with priority valve | |
| Specifications and Pressure Checks | Engine, transmission, steering, and hydraulic specifications with pressure checks per group | |
