GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2002 🢒 Isuzu T-Series (Truck Line C) 🢒 Driveline/Axle 🢒 Rear Axle Controls 🢒 Differential Lock Control Valve Replacement

Removal Procedure

    Object Number: 199151 Size: MH
  1. Apply the parking brake.
  2. Block the wheels.
  3. Drain all of the air reservoirs. Refer to Draining Reservoirs in Air Brakes.

    4. Important: Tag the air lines for later installation.

  4. Remove the air lines at the differential lock control valve. Refer to Hose and Line Replacement - Nylon and Metal Compression in Air Brakes.
  5. Remove the differential lock control valve name plate screws (1).
  6. Remove the differential lock control valve name plate (2).
  7. Remove the differential lock control valve (3) from the instrument panel.
  8. Inspect the air lines for the following conditions:
    9. • Damage
    • Kinks
    • Wear
  9. Repair or replace the air lines as needed. Refer to Hose and Line Replacement - Nylon and Metal Compression in Air Brakes.

Installation Procedure

    Object Number: 199151 Size: MH
  1. Install the differential lock control valve (3) into the instrument panel.
  2. Install the differential lock control valve name plate (2).

    3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the differential lock control valve name plate screws (1).

    4. Tighten
    Tighten the differential lock control valve name plate screws (1) until fully seated. Do not strip the differential lock control valve name plate screws (1).

  4. Install the air lines at the differential lock control valve (3). Refer to Hose and Line Replacement - Nylon and Metal Compression in Air Brakes.
  5. Start the engine. Charge the system to the air compressor governor cutout point.
  6. Stop the engine.
  7. Inspect for air leaks using a soap solution.
  8. Verify proper operation of the differential lock.
  9. Remove the wheel blocks.