Eaton Fuller Transmission Fluid Change, and Magnetic Plug Cleaning

122SD mm 26.01.01

    Notice: Operating a transmission with the fluid level higher or lower than recommended can result in transmission damage. Do not overfill the transmission. Overfilling will force fluid out of the case through the main shaft openings.

    Do not mix types and brands of fluid, because of possible incompatibility. Do not use fluid additives, friction modifiers, extreme-pressure gear fluids, or multiviscosity lubricants.

    Note: Fluid change intervals are extended to 500,000 miles (800 000 km) on any vehicles filled with synthetic transmission fluid.

  1. If the transmission fluid is not at normal operating temperature, run the engine until the fluid reaches operating temperature.
  2. Park the vehicle on level ground, apply the parking brakes, shift the transmission to neutral (N), shut down the engine, and chock the tires.
  3. Place a large drain pan under the transmission.
  4. Clean the area around the fill plug, and remove it from the side of the gear case. Remove each drain plug from the bottom of the case.
  5. Clean the fill and drain plugs. For magnetic plugs, use a piece of key stock or any other convenient steel slug to short the two magnetic poles and divert the magnetic field. Install and tighten each drain plug 50 lbf·ft (68 N·m).

    6. Note: The optional transmission fluid filter is a remote-mount, spin-on type, and is located between the transmission and the fluid cooler. The filter bracket is attached to the frame rail or some other nearby location. The filter is mounted in a vertical position, and should be filled with fluid before installation to assure the proper fluid level. For optimum transmission performance, change the filter each time that the fluid is changed.

  6. For a transmission equipped with a transmission fluid filter(s), replace the fluid filter(s) as follows.
    1. Place a drain pan under the transmission fluid filter.

      2. Caution: To prevent skin burns from hot transmission fluid, wear protective gloves when removing the filter.

    2. Place a strap or chain wrench around the filter canister, and rotate it in a counterclockwise motion to separate the filter from the mounting. Carefully spin the filter off the mount and remove it from the vehicle.
    3. Apply a light coat of transmission fluid to the O-ring gasket on the new filter. Fill the filter with specified transmission fluid, and spin the filter onto the mount.

      4. Note: The filter fills slowly, so be patient to ensure the proper fluid level has been reached.

    4. Once the filter makes contact with the mount, use a strap wrench to rotate the canister an additional 180 to 270 degrees to firmly tighten the filter. Wipe the filter clean of any fluid after it is tightened.
  7. Add fluid until it is level with the lower edge of the fill opening. See Fig.. If the transmission has two fill openings, add fluid to the level of both openings. See Table. for approved transmission lubricants. See Table. for Eaton Fuller transmission lubricant capacities.

    • Full

    • Low

    Fig. 1, Checking Transmission Fluid Level

    Table 1, Eaton Approved Manual and Automated Transmission Lubricants

    Eaton Approved Manual and Automated Transmission Lubricants

    Lubricant Type1

    Temperature

    SAE Viscosity

    Synthetic transmission lubricant meeting Eaton PS-386 lubricant specification

    All

    —
    1. Do not mix types or brands of lubricant.

    Table 1, Eaton Approved Manual and Automated Transmission Lubricants

    Table 2, Eaton Fuller Transmission Lubricant Capacities

    Eaton Fuller Transmission Lubricant Capacities

    Transmission Model1

    Refill Capacity: qt (L)2

     9-Speed Series 
    1. For models not listed in this table see the Eaton Fuller website, www.roadranger.com
    2. Quantities listed are approximate. Fill transmission until lubricant is level with bottom of fill hole with vehicle in normal operating position.

    Table 2, Eaton Fuller Transmission Lubricant Capacities

    All Models

    14 (13)

     10-Speed Manual (except deep reduction) 

      Table 2, Eaton Fuller Transmission Lubricant Capacities

      FR and FRO Series

      11.75 (11)

       10-Speed Deep Reduction 

      RTO–14908LL

      14.0 (13)

      RTO–16908LL

       10-Speed Automatic 

        Table 2, Eaton Fuller Transmission Lubricant Capacities

        RTO-16910C-AS Autoshift

        RTO-14910C-AS Autoshift

        RTO-16910B-DM2 Ultrashift

        14 (13)

        RTO-18910B-AS Autoshift

        RTO-16910B-AS Autoshift

        13 (12)

        13-Speed Series 

          Table 2, Eaton Fuller Transmission Lubricant Capacities

          RTLO and RTLOM Series

          14 (13)

           15-Speed Series 

            Table 2, Eaton Fuller Transmission Lubricant Capacities

            RT and RTO Series

            14 (13)

             18-Speed Series 

              Table 2, Eaton Fuller Transmission Lubricant Capacities

              RTLO Series

              14 (13)

              18-Speed Autoshift AS

                Table 2, Eaton Fuller Transmission Lubricant Capacities

                1. Note: In all cases, the correct fluid level is established by checking at the fill opening.

              1. Operate the engine for five minutes after filling the transmission, then check the fluid level again.
              2. Clean the fill plug, then install it in the transmission. Tighten the plug as follows:
                1. 25 to 35 lbf·ft (34 to 48 N·m) for Eaton Fuller transmissions with 3/4-inch pipe threads.
                2. 60 to 75 lbf·ft (81 to 102 N·m) for Eaton Fuller transmissions with 1-1/4-inch pipe threads.
              3. Operate the vehicle to check for correct operation.
              Note:
              Parent topic: Transmission
              Document Number: 0000125511
              Manual Publication Date: 2025-02-11
              Topic Publication Date: 2024-06-21