Flushing

m2+ m 25.02.000

Replace the clutch hydraulic fluid every two years to ensure clutch function is reliable and correct. Use the procedures below. Fluid replacement must be done at an authorized Freightliner service facility.

  1. Shut down the engine.
  2. Apply the parking brakes, chock the front and rear tires, and raise the hood.

    3. Warning: Clutch hydraulic fluid (DOT 4 brake fluid) is hazardous. It may be a skin irritant and can cause blindness if it gets in your eyes. Always wear safety glasses when handling clutch hydraulic fluid or bleeding hydraulic lines. If you get clutch hydraulic fluid on your skin, wash it off as soon as possible.

  3. Prepare the pressure bleeding equipment according to the manufacturer's instructions. Use DOT 4 brake fluid. Pressurize the bleed adaptor to 15 psi (103 kPa).

    4. Caution: Do not spill clutch hydraulic fluid (DOT 4 brake fluid) on the cab paint. Clean it off immediately if any is spilled. DOT 4 brake fluid can damage paint.

  4. Remove the reservoir lid and install the pressure bleed adaptor on the reservoir.
  5. Pressurize the reservoir, filling the system. Open the bleed valve on the bleed tank of the adaptor.

    6. Note: A pressure bleeder hose (J-29532) and a bleed adaptor (J-35798) for the fluid reservoir are available through SPX Kent-Moore Tools and may be used to complete the following procedure. To order these parts, call Kent-Moore at 1-800-328-6657.

  6. Flush the hydraulic system. See Fig..

    1. Clamp-Mounting Bolt, 1/4–20

    2. Plated Steel Washer

    3. Locknut, 1/4–20

    4. Bell Housing Standoff Bracket

    5. Secondary Cylinder Standoff Bracket

    6. Hydraulic Hose

    7. Secondary Cylinder

    8. Bleed Valve

    9. Bell Housing

    10. Secondary Cylinder Mounting Capscrew, M8

    Fig. 1, Clutch Secondary Cylinder

    1. Open the bleed screw on the secondary cylinder.
    2. Using a drain pan or other suitable container, collect the fluid that drains from the secondary cylinder bleed valve, at least 0.5 quarts (0.5 liters).
    3. When all the old fluid has passed through the system and only new, clean fluid is coming out, close the bleed screw.
  7. Check the fluid level in the reservoir and bleed the system according to the procedures under the heading "Bleeding the Clutch." See Fig..

    1. M8 Capscrew and Washer

    2. Pedal Unit Mounting Plate

    3. Reservoir

    4. Pedal Unit

    5. Main Cylinder

    6. Hydraulic Hose

    7. Cup Bracket

    8. Standoff Bracket

    9. Mounting Bolt, M10

    Fig. 2, Clutch Main Cylinder

Note:
Parent topic: Clutch Hydraulic Fluid Changing
Document Number: 0000121936
Manual Publication Date: 2025-02-11
Topic Publication Date: 2024-11-06