CASE Series B Grader Front Wheel Drive (FWD) Functional Scheme FG200 PDF | Hydraulic & Electronic Control Diagram

This CASE Grader Front Wheel Drive Functional Scheme FG200 PDF provides the complete electrical and hydraulic layout of the AWD/FWD system used in CASE Series B motor graders.
The document details signal inputs, outputs, and communication protocols between TCU (Transmission Control Unit), ECM (Engine Control Module), and Linde HPV55-02 / HMV75-02 hydraulic components.

Technical Highlights

• System type: FG200 Front Wheel Drive (AWD configuration)

• Date: 14 July 2009

• Primary modules:

  • TCU / ECM (EDC)

  • AWD control switchpad

  • Hydraulic pump (HPV 55-02)

  • Hydraulic motors (HMV 75-02 Left / Right)

• Control logic shown:

  • Motor Displacement Calculation (Task E 50 ms)

  • Pump Displacement Calculation (Task G 50 ms)

  • Motor Control (Task A 10 ms)

  • Pump Control (Task B 10 ms)

  • CAN Bus Data Exchange (Tasks C, I 100 ms)

• Inputs covered:

  • Accelerator, inching, brake pedals

  • Forward/neutral/reverse switches

  • AWD / Creep / Drive Behavior selector

  • Pressure sensors (u16PresFw, u16PresRv)

• Outputs:

  • Solenoid valve control (PWM signals)

  • Proportional displacement valves

  • Pressure dump and high-pressure cut-off

• Operating range:

  • Max pump displacement ±55 cc

  • Max motor torque 10 645 Nm @ 167 rpm

  • System pressure 420 bar (6091 psi) continuous / 500 bar peak

• Communication:

  • CAN J1939 @ 10 ms & 100 ms update rates

  • ECM–TCU integration with drive behavior logic

• Diagram features (page 1):

  • Inputs/Outputs legend (yellow/green blocks)

  • Hydraulic flow paths with charge pump, pilot valve, and main circuit

  • Cooling system sizing notes for max ambient temperature and heat dissipation

File Information

• Publisher: Neubert Engineering

• System: CASE Series B Grader FWD / AWD Hydraulic System FG200

• Pages: 1 (Full schematic)

• Language: English / Technical Symbols (IEC standard)

• Format: Vector PDF

• Category: Hydraulic and Electronic System Diagram

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