CASE 845B 865B 885B Motor Grader Service & Parking Brake Training Manual PDF | Hydraulic Wet Disc Brake System & Accumulator Adjustment

This official CASE Motor Grader Series B Technical Training Manual explains in detail the hydraulically actuated, multiple sealed wet-disc service and parking brake system used on the 845B, 865B and 885B models. It includes system schematics, hydraulic flow paths, valve settings, and accumulator charging parameters.
The manual illustrates the latest axle design introduced after March 2008, featuring outboard brake discs (5 per wheel on 845B/865B, 6 on 885B) and integrated pressure testing points for safe diagnostics.

Clear photographs and diagrams explain the pump configuration, pressure control screws, and accumulator recharge range for precision adjustment and maintenance training.

Technical Highlights

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

• System Type: Hydraulic wet disc service and parking brakes

• Service Brake: Foot-operated, hydraulically actuated, maintenance-free multiple sealed discs with accumulator assist to all four wheels

• Brake Configuration:

  • 845B & 865B – 5 discs per brake

  • 885B – 6 discs per brake

• Pump Type: Gear pump, capacity 9.9 GPM (37.3 L/min) @ 2 200 RPM

• Operating Pressures:

  • Steering Valve – 235 bar (3 410 psi)

  • Brake Valve – 172 bar (2 500 psi)

  • Priority Valve – 151 bar (2 200 psi)

• Accumulator Adjustments:

  • Minimum Pressure – 81-87 bar (1 175-1 261 psi)

  • Maximum Pressure – 120-126 bar (1 740-1 827 psi)

• Brake Piston Pressure Adjustment: 39-45 bar (566-652 psi)

• Residual Pressure: 1 bar (14.5 psi)

• Components Highlighted: Brake valve assembly with low-pressure sensor and brake light sensor (see page 5 diagram).

• Training Images: Accumulator adjustment fittings, pump layout, and service brake pressure testing ports (see pages 4-8).

Table of Content

• Introduction – System Overview & Hydraulic Operation

• Service Brake Function – Pump and Valve Operation

• Parking Brake – Integration and Control

• Hydraulic Schematics – Service & Differential Lock Circuits

• Brake Valve and Sensors – Low Pressure and Light Switch

• Accumulator Pressure Adjustment Procedures

• Brake Piston Pressure Setting Guidelines

• Test Fittings and Residual Pressure Check

• Maintenance and Troubleshooting Notes

File Information

• Manufacturer: CASE Construction Equipment

• Machine Models: 845B / 865B / 885B Series B Graders

• System Type: Hydraulic Brake & Parking System

• Language: English

• Slides: 15

• Format: PDF (Searchable + Diagrams + Photos)

• Category: Technical Training / Brake System Manual

Delivery

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