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

Official CASE Construction technical training manual dedicated to the hydraulic steering system of the B-Series graders (845 – 865 – 885).
This guide details the operation of the SAE J53 / J1511 hydraulic-orbital steering, the load-sensing circuit, and the priority-valve integration for precise front-wheel control and safe hydraulic distribution.

Technical Highlights

• Steering Type: Hydraulic orbital (SAE J53 & J1511)

• Steering Wheel Turns: 4.75 (lock-to-lock)

• Pump Type: Gear pump – 9.9 GPM (37.3 L/min @ 2200 RPM)

• Pressure Relief Valve: 2200 psi (152 bar) with priority valve

• Main Relief Valve: 172 bar (2500 psi)

• Cylinders: 2 × (2″ × 11.85″ / 50.8 mm × 301 mm)

• Rod Diameter: 1″ (25.4 mm)

• Pressure Test: 152 bar (2200 psi)

• Applicable Models: 845, 845 DHP, 865, 865 VHP, 885

Table of Content

• Front Wheels Steering Specifications

• Steering and Brake Pump Configuration

• Steering Circuit and Hydraulic Diagram

• Priority Valve and Main Relief Valve Operation

• Flow Divider Spool and Metering Edges

• Load-Sensing Steering Unit (Cylinder Relief Valves)

• Component Disassembly and Identification

• Check Valves and Anti-Cavitation Valves

• Dynamic Signal – Open Center Pump Schematic

• Pressure Testing and Adjustment Procedure

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