CASE B-Series Motor Grader Hydraulic System Technical Training Manual (845B / 865B / 885B)

Official CASE Construction training manual explaining the complete hydraulic system of the B-Series graders (models 845B, 865B, and 885B). It covers system operation, component functions, pressure circuits, and flow distribution logic for both implement and steering hydraulics. Detailed circuit schematics and adjustment guidelines ensure correct diagnosis, calibration, and testing during service procedures.

Technical Highlights

• Applicable Models: CASE 845B / 865B / 885B Motor Graders

• Hydraulic Pump: Load-sensing axial piston type (Linde HPV-02)

• Pump Capacity: 120 L/min @ 2200 RPM

• System Pressure:

  • Steering circuit: 152 bar (2200 psi)

  • Implement circuit: 210 bar (3045 psi)

• Relief Valves:

  • Main relief valve: 210 ± 10 bar

  • Steering relief valve: 152 ± 10 bar

• Hydraulic Oil Type: ISO VG 46 (CASE Hy-Tran Ultra)

• Filtration: 10 μm nominal; 25 μm absolute

• Control Type: Load-sensing with priority-valve flow management

• Implement Functions Controlled:

  • Blade lift, tilt, articulation

  • Circle rotation

  • Moldboard slide

  • Front-wheel lean

• Hydraulic Reservoir Capacity: 72 L (19 gal)

• Temperature Range: -20°C to +90°C operating range

• Safety Devices: Integrated pressure limiting, neutral centering valves, accumulator safety check

Table of Content

• Hydraulic System Overview

• Hydraulic Circuit Schematic

• Pump and Reservoir Specifications

• Priority Valve and Flow Divider Description

• Implement Control Valves (Lift, Tilt, Circle, Lean)

• Steering Hydraulic Circuit Interaction

• Pressure Testing and Adjustments

• Hydraulic Oil Flow Diagrams

• Safety and Maintenance Procedures

• Troubleshooting and Diagnosis

File Information

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