Part of the Case Repair Manuals.
Swing bearing loose, travel motor dragging, or a pilot circuit that will not hold: the 771-page Case CX50B service manual PDF, shop manual 6-77470NA, answers those jobs on the hydraulic excavator itself. Wiring diagrams trace circuits from the key switch through the solenoids, and hydraulic schematics show pump-to-valve-to-cylinder routing across the machine. Troubleshooting runs a substantial block of the book, splitting hydraulic, electrical, and engine faults into charts you follow from symptom to the test that proves it. Set piston pump P1 and P2 working pressure at 23.0 MPa (3340 psi), check the 2-speed shift signal at 3.5 MPa (507 psi), and fill the 3TNV82A with 3.6 L. Text-searchable, it prints clean, so the pages you need can live on the bench and take some grease.
What's Inside This Case CX50B Manual
| System | Pages | Key Topics |
|---|---|---|
| Standard Specifications and Maintenance | 4-105 | Specifications (Components Name, Machine Dimensions, Performance) |
| Hydraulic, Electrical, and Component Systems | 106-259 | Hydraulic System Summary, Electrical System, Hydraulic Components, Electrical Equipment, Circuit Operation |
| General Disassembly and Assembly | 260-495 | General Disassembly, Attachments, Upper Slewing Structure, Travel System, Disassembly Procedures |
| Troubleshooting | 496-543 | Hydraulic System Troubleshooting, Electrical System Troubleshooting, Engine Troubleshooting, Diagnostic Procedures |
| Engine | 544-767 | Engine Nomenclature, Periodic Maintenance, Inspection and Adjustment, Disassembly and Reassembly, Lubrication System, Cooling System, Fuel Injection Pump, Turbocharger |
| Electrical and Hydraulic Schematics | 768-771 | Electrical Schematic, Hydraulic Schematic, Piping Diagrams, Component Identification |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Working pressure (Piston pump P1 + P2) | 23.0 MPa (3340 psi) | p. 212 |
| Working pressure (Gear pump P3) | 20.0 MPa (2900 psi) | p. 174 |
| Rated operating pressure | 23.0 MPa (3340 psi) | p. 212 |
| 2-Speed shifting pressure | 3.5 MPa (507 psi) | p. 212 |
| Engine Oil Capacity (3TNV82A Total) | 3.6 L | p. 569 |
| Coolant Water Capacity (3TNV82A) | 1.8 L | p. 569 |
| Main Relief Valve Setting (P1, P2) | 23.0 +0.5 MPa (3340 +72 psi) | p. 89 |
| Travel Motor Mounting Bolt Torque | 181 Nm (133 lb ft) | p. 455 |
| Sprocket Mounting Bolt Torque | 181 Nm (133 lb ft) | p. 454 |
| Cylinder Head Bolt Torque (TNV82A First Step) | 30.0-34.0 Nm (3.1-3.5 kgf-m) | p. 642 |
| Cylinder Head Bolt Torque (TNV82A Second Step) | 61.7-65.7 Nm (6.3-6.7 kgf-m) | p. 642 |
| Connecting Rod Bolt Torque (3TNV82A) | 37.2-41.2 Nm (3.8-4.2 kgf-m) | p. 659 |
