Mechanical Fan Drive Gearbox Oil Change

rv mm 20.04.000
  1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires.
  2. Place a drain pan under the fan drive gearbox.

    3. Important: Label the plugs as they are removed. The breather/fill plug must always be installed in the top of the gearbox, opposite the drain plug.

  3. Remove the drain plug and breather/fill plug, shown in Fig., to begin draining the oil.

    1. Pinion Shaft

    2. Breather/Fill Plug

    3. Oil Level Plug

    4. Drain Plug

    5. Cross-Shaft

    Fig. 1, Mechanical Fan Drive Gearbox

  4. Remove the oil level plug. See Fig..
  5. Flush the fan drive gearbox with an approved nonflammalbe, nontoxic solvent such as:

    • Lubriplate Syn Flush

    • Lubriplate Pure Flush

    • Whitmore's Flushing Oil

    • Medallion™ Flushing Oil Kosher

  6. Using degreaser, clean the thread on the drain hole and drain plug.
  7. Install the drain plug.
  8. Fill the fan drive gearbox with Mobil® Delvac 75W–90 lubricant until the lubricant starts to come out of the oil level plug hole.
  9. Using degreaser, clean the thread on the oil level and fill holes and both plugs.
  10. Install the plugs, making certain that the breather/fill plug is used in the fill plug hole.
Note:
Parent topic: Engine Cooling/Radiator
Document Number: 0000120277
Manual Publication Date: 2024-05-23
Topic Publication Date: 2024-11-13