Part of the Case Repair Manuals.
Every one of the 489 pages in this Case Compact Wheel Loader service manual (OEM #87734636C) covers the 21E, 121E, 221E, and 321E, so you're not hunting through a generic guide for your specific machine. Open it up and you get full hydraulic schematics for the variable-displacement piston pump and travel motor, complete wiring diagrams for fuses, relays, and bulb circuits, and a troubleshooting section that walks each axle, brake, and steering fault back to its cause. Set the main control valve relief at 230 ± 10 bar, and torque the fuel pump and fuel filter to 25 Nm each; this book even tells you loader arms drooping about 15 mm over 15 minutes is normal cylinder yield, not a leak to chase. That quick coupler jamming on you mid-job? Page 467 has the exact reset procedure. Download it, open it on your phone at the machine, and search any spec by keyword instead of flipping pages.
What's Inside This Case 21E, 121E, 221E, 321E Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 8-35 | Safety Instructions, Technical Specifications |
| Engine | 36-43 | Diesel Engine, Fuel System, Cold Start Device |
| Front Axles | 44-127 | Removal and Installation, Dimensions, Technical Specifications, Oil Change, Disassembly and Assembly, Troubleshooting, Special Tools |
| Rear Axles | 128-239 | Motor TB150, Motor TB138.5 "High Speed", Transmission Box TB150, Transmission TB138.5 "High Speed", Reduction Gear (21E), Reduction Unit (121E, 221E |
| Brake System | 240-259 | Brake System Diagram, Technical Specifications, Operation, Brake Pedal Valve, Brake Accumulator, Troubleshooting |
| Hydraulic System | 260-351 | Hydraulic Diagrams, Transmission, Variable-Displacement Piston Pump, Gear Pump, Travel Motor, Troubleshooting |
| Frame | 352-357 | Articulated Joint, Components, Disassembly and Assembly |
| Steering System | 358-393 | Operation, Power Steering, Steering Cylinder, Troubleshooting, Special Tools |
| Heating and Airconditioning System | 394-427 | Heating, Air Conditioning, Troubleshooting, Operation, System Overhaul |
| Electrical System | 428-459 | Electrical Diagrams, Fuses and Relays, Voltage and Continuity Check, Battery, Bulbs, Troubleshooting |
| Working Equipment | 460-489 | Hydraulic Diagram, Quick Tool Coupler, Bucket, Forks, Cylinders, Control Valve |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel pump tightening torque | 25 Nm (18.43 lbf·ft) | p. 25 |
| Fuel filter tightening torque | 25 Nm (18.43 lbf·ft) | p. 25 |
| High pressure relief valve (main control valve) setting | 230 ± 10 bar (3335 ± 145) | p. 486 |
| Lifting cylinders yield (droop) over 15 minutes | about 15 mm (0.59 in) | p. 487 |
| Engine weight | 300 kg (660 lb) | p. 24 |
| Total displacement | 3202 cm3 (195.36 in3) | p. 24 |
| External noise level LWA | 98 dB (A) | p. 24 |
| Internal noise level LpA | 75 dB (A) | p. 24 |
| Brake pedal valve - Allowable service pressure | 175 bar (2538 psi) | p. 26 |
| Steering system pressure | 175 bar (2537 psi) | p. 27 |
| Wheel nuts tightening torque | 550 Nm (405.65 lbf·ft) | p. 33 |
