Lubrication of the U-Joint

rv mm 41.02.000
  1. Wipe all old grease and dirt from each U-joint grease fitting.
  2. Use a hand-type grease gun, or a high-pressure gun with a low-pressure adaptor, to lubricate the U-joints. See Fig..

    • After grease appears, cover the pressure-relief hole while continuing to lubricate.

    1. Slip-Joint Grease Fitting (with grease gun attached)

    2. Yoke Plug

    3. Grease

    4. Half-Round Yoke

    5. Yoke Plug Pressure-Relief-Hole

    6. Slip-Joint Seal

    7. Full-Round Yoke

    8. U-Joint Grease Fitting

    Fig. 1, Slip-Joint and U-Joint Lubricating

    3. Note: If a low-pressure adaptor is not used with the high-pressure gun, the U-joints may not receive enough lubricant.

  3. Using lithium 12-hydroxy stearate grease (NLGI grade 1 or 2, with EP additives), lubricate until new grease can be seen at all four U-joint seals.

    4. Notice: Fresh lubricant must be seen escaping from all four of the bearing cup seals of each U-joint. If not, the U-joint may fail prematurely.

  4. If the bearing will not take grease, replace the U-joint assembly. For instructions, see of the vehicle Workshop Manual, or take the vehicle to an authorized Freightliner dealer.
  5. Check the old grease. If it appears rusty, gritty, or burned, replace the U-joint assembly. For instructions, see of the vehicle Workshop Manual, or take the vehicle to an authorized Freightliner dealer.
  6. Wipe any excess grease from the seals and grease fittings.
Note:
Parent topic: Inspection and Lubrication of the Driveline
Document Number: 0000120638
Manual Publication Date: 2024-05-23
Topic Publication Date: 2024-11-13