Eaton Fuller Transmission Fluid Change and Magnetic Plug Cleaning

P4 MM 26.04, 5th Generation Cascadia MM
    Important: Drain the transmission when the fluid is warm. If not already warm, run the engine until the transmission fluid reaches operating temperature. Shift the transmission to neutral (N) and shut down the engine.

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

    Note: Information in this MOP applies to Eaton Fuller manual and automated transmissions. Fluid change intervals are extended to 500,000 miles (800 000 km) on any vehicles filled with synthetic transmission fluid.
  1. Apply the parking brakes, and chock the rear tires. Place a large drain pan under the transmission.
  2. 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.
  3. 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.
  4. Install each drain plug and tighten them 50 lbf·ft (68 N·m).
    5. Note: For an Eaton Fuller transmission, 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.
  5. For an Eaton Fuller 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 set.
    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.
  6. 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, and Table for transmission lubricant capacities.

    • Full

    • Low

    Fig. 1, Checking Transmission Fluid Level

    For more information and a complete listing of Eaton approved lubricants, refer to the Eaton website.

    Table 1, Approved Manual Transmission Lubricants

    Transmission Model

    Lubricant Type 1

    Temp. Range

    SAE Viscosity

    All Eaton Fuller

    MobilTrans SHC 50 (RN 2952 E-5)

    All

    50W

    Synthetic transmission lubricant approved by Eaton

    All

    50W
    1. Do not mix types or brands of fluid. Multi-weight and extreme-pressure gear fluids are not recommended.

    Table 1, Approved Manual Transmission Lubricants

    Table 2, Eaton Fuller Transmission Lubricant Capacities

    Transmission Type

    Transmission Model

    Refill Capacity: qt (L)

    7-Speed T Series

    All Models

    18.0 (17.0)

    All 9-Speed Series

    All Models

    13.5 (12.8)

    All 10-Speed Manual (except deep reduction)

    FR and FRO Series

    11.75 (11.0)

    RT and RTX Series

    13.0 (12.3)

    RTLO Series

    14.0 (13.2)

    10-Speed Deep Reduction

    RTO–14908LL

    14.0 (13.2)

    RTO–16908LL

    10-Speed Advantage

    FA Series

    8.0 (7.5)

    10-Speed Automated

    Lightning Top 2 (all)

    13.5 (12.8)

    10-Speed Autoshift AS2 (all)

    13.0 (12.3)

    13-Speed RTLO Series

    All Models

    14.0 (13.2)

    15-Speed RTO Series

    All Models

    14.0 (13.2)

    All 18-Speed Series

    RTLO Series

    14.0 (13.2)

    18-Speed Autoshift AS2 (all)

    UltraShift PLUS

    LAS

    13.0 (12.0)

    MHP and MXP

    14.0 (13.0)

      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. Install the fill plug and 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:

      • For an Eaton Fuller transmission with a plug with 3/4-inch pipe threads, tighten the plug 25 to 35 lbf·ft (34 to 48 N·m).

      • For an Eaton Fuller transmission with a plug with 1-1/4-inch pipe threads, tighten the plug 60 to 75 lbf·ft (81 to 102 N·m).

    Note:
    Parent topic: Transmission
    Document Number: 0000102688
    Manual Publication Date: 2024-05-15
    Topic Publication Date: 2026-05-06