CASE 845B / 865B / 885B AWD System Functional Manual PDF | Hydraulic Drive & Calibration Guide

The CASE Series B Motor Grader AWD Functional Manual delivers a complete overview of the hydraulic front-wheel-drive system used in CASE 845B, 865B, and 885B models.
It provides clear guidance on system design, operation modes, calibration via EST (Engineering Service Tool), and diagnostic sensor functions.

This manual is essential for technicians servicing or diagnosing AWD-equipped graders, detailing Linde Hydraulics HPV55-02 pump, HMV75-02 motors, and electro-hydraulic proportional solenoid controls.

Technical Highlights

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

• System type: AWD (All Wheel Drive) hydraulic assist system

• Manufacturer components:

  • Main Pump: Linde HPV55-02 axial piston pump (54.8 cc/rev)

  • Drive Motors: Linde HMV75-02 swash plate type (75.9 cc/rev)

  • Max Pressure: 420 bar (6091 PSI) continuous / 500 bar peak

• Operation Modes:

  • 4WD Mode (Rear drive only)

  • AWD Mode (Front + Rear drive)

  • Creep Mode (Front drive only for precision work)

• Control unit: AWD Controller + Switch Pad + Rotary Selector (16 LED levels)

• Calibration method: Automatic via CASE EST tool (for pump/motor solenoids)

• Diagnostic integration: CAN-Bus linked sensors (speed, pressure, solenoids)

• Oil specification: Ambra Hydrosystem 68 HV, purity standard ISO 4406: 18/16/13

• Key features:

  • Energy-efficient hydraulic flow control

  • Pressure sensors S88 (Forward) / S89 (Reverse)

  • Error codes and solenoid monitoring system

  • Creep mode proportional pedal logic with LED feedback

  • Automatic recall of saved drive preferences

Table of Content

• 1. AWD Applications Overview
   AWD, Creep, and 4WD use cases — slope work, ditch cutting, snow plowing

• 2. System Operation & Modes
   Description of drive modes, creep mode configuration, LED rotary selector functions

• 3. Hydraulic System Overview
   Flow diagram, pump-motor schematic, flow divider, and controllability logic

• 4. Key Components
   HPV55-02 Pump, HMV75-02 Motors, Solenoids, Flow Divider, Sensors

• 5. Control System & Calibration
   AWD keypad, automatic calibration via EST, memory save of aggressiveness levels

• 6. Diagnostics & Error Codes
   Speed sensor (S85), solenoid error list, pressure sensors S88/S89, calibration failure detection

• 7. Hydraulic Pressure & Flow Specifications
   Operating pressure limits, displacement ratio, and gear-speed relation

• 8. Hydraulic Oil & Filtration
   Oil purity class ISO 4406 (18/16/13), filter standards SAE AS4059

File Information

• Manufacturer: CASE Construction Equipment

• Applicable Models: 845B / 865B / 885B Series B

• System: AWD Hydraulic Drive System

• Language: English

• Slides: +40

• Format: PDF

• Category: Technical Training / Hydraulic System

Delivery

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