Downshifting

SD DM 13.00.04
  1. Downshift from 8th overdrive to 8th direct without moving the shift lever. Flip the splitter-control button to the direct (rearward) position, then immediately release the accelerator, and disengage the clutch. Engage the clutch, and accelerate the engine only after the transmission has shifted.
  2. Start the downshift from 8th direct to 7th overdrive by flipping the splitter-control button to the overdrive (forward) position; then, immediately double-clutch through neutral, moving the shift lever from 8th to 7th gear.
  3. Shift downward through each of the high range gears, alternating the procedures in steps 1 and 2, above, until reaching 5th direct.
  4. While in 5th direct and ready for the downshift to 4th (13-speed transmissions) or 4th overdrive (18-speed transmissions), push the range-preselection lever down. Then, double-clutch through neutral and move the shift lever to the 4th gear position. On 18-speed transmissions, move the splitter-control button to the overdrive (forward) position before engaging the clutch. Do not move the control button while the shift lever is in neutral.

    5. Important: Never use the clutch brake when downshifting, or as a brake to slow the vehicle.

  5. Continue downshifting from 4th to 1st as follows: For 13-speed transmissions: Downshift through the low range gears as conditions require. For 18-speed transmissions: Continue downshifting from 4th overdrive to 4th direct, then 4th direct to 3rd overdrive, 3rd overdrive to 3rd direct, etc. Single-clutch when split shifting (direct to overdrive, overdrive to direct). Double-clutch when making lever shifts (4th to 3rd, 3rd to 2nd, etc.).
Note:
Parent topic: Eaton Fuller 13-Speed and 18-Speed Splitter and Range-Shift Transmissions
Document Number: 0000123382
Manual Publication Date: 2025-01-23
Topic Publication Date: 2025-01-23