CASE 885B All Wheel Drive Grader Training & Hydraulic Control Manual PDF | AWD System Operation and Calibration Guide

This CASE 885B AWD Grader Functional and Training Manual details every aspect of the All Wheel Drive hydraulic and control system used in Series B motor graders.
It explains the AWD software logic, operation modes, calibration sequence, and sensor mapping, with extensive hydraulic and electronic schematics.

Developed by the CASE Engineering Division (Belo Horizonte Plant), the manual is a step-by-step reference for technicians, calibrators, and field trainers, integrating both the Funk transmission interface and Linde hydraulic components (HPV-55-02 pump / HMV-02 motors).

Technical Highlights

• Applicable Machine: CASE 885B AWD Motor Grader

• Powertrain integration: FUNK DF-254 Direct Drive Transmission with AWD hydraulic interface

• Hydraulic components:

  • HPV-55-02 axial piston pump (55 cc/rev)

  • HMV-02 variable displacement motors (left & right)

  • Internal gear charge pump 22.5 cc/rev @ 32 bar

• Control features:

  • 4-WD / AWD / Creep Mode logic with automatic memory recall

  • Rotary selector with 16 stages of aggressivity

  • Power Mode activation through EHC integration

  • EST-based calibration (~3.5 min cycle @ 1 500 RPM)

• Diagnostics & Error Codes (page 45):

  • EV-MS Open/Short circuit at pilot dump valve

  • EV-MY Forward valve current faults

  • EV-MZ Reverse valve open/short to ground/power

• System pressures: 420 bar nominal / 500 bar peak

• Modes Explained (pages 3–6):

  • 4-WD Mode → rear drive only

  • AWD Mode → rear + front drive, adjustable traction ratio

  • Creep Mode → front hydrostatic drive only (≤ 5 kph)

• Hydraulic Circuit (pages 41-47):

  • Proportional valves MY/MZ with PWM control

  • Charge pump / pilot dump / flow divider integration

• Sensors & Actuators:

  • Dual RPM sensors (left/right motors)

  • Pressure sensors forward/reverse

  • Speed, gear stage & pedal position inputs

Table of Content

• Overview & System Purpose – AWD software architecture, operating modes

• Hardware Layout – Pump, motors, flow divider, controller assembly

• Operating Modes – 4-WD, AWD, Creep Mode operation logic

• Calibration Procedure – Automatic EOL/EST routine (3.5 min cycle @ 1 500 RPM)

• Hydraulic Flow Diagrams – Pressure paths, charge pump schematic

• AWD Controller I/O List – Inputs, PWM outputs, CAN signals

• Troubleshooting Codes – AWD valve and sensor error descriptions

• Hydraulic Motor & Pump Specifications – Torque maps and RPM limits

• Diagnostic Functions & Safety Modes – “Come Home” operation

• AWD Hydraulic and Electrical Schematics – Functional diagram of 885B

File Information

• Manufacturer: CASE Construction Equipment

• Machine Model: CASE 885B Motor Grader (AWD)

• Language: English

• Slides: +100

• Format: PDF (Searchable + Color Schematics + Component Photos)

• Category: Technical Training / Hydraulic Operation Manual

Delivery

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