Eaton Viscous Fan Drive Check (Noise Emission Control)

sb mm 20.04.001

Caution: If the fan drive assembly is damaged, replace the unit as soon as possible. Operating a seized or otherwise damaged clutch reduces fuel economy, and could cause serious engine damage.

See General Information, Cooling System Troubleshooting of the Shuttle Bus Chassis Workshop Manual for replacement instructions, or take the vehicle to an authorized Freightliner dealer.

  1. With the engine shut down, rotate the fan at least one full turn by hand. It should have a smooth, steady drag. If it does not, replace the fan clutch. 2.
  2. Check for physical damage to the fan or fan shroud.
  3. At the fan clutch mounting:
    1. Check for correct drive belt alignment and tension. For specifications, see General Information, Air Intake Heater, Cummins ISB Engine of the Shuttle Bus Chassis Workshop Manual, or take the vehicle to an authorized Freightliner dealer.
    2. Check for wear of the fan clutch bearings. There should be no side-to-side or in-and-out movement of the fan clutch.
    3. Do all of the checks in General Information, Cooling System Troubleshooting of the Shuttle Bus Chassis Workshop Manual, or take the vehicle to an authorized Freightliner dealer.
Note:
Parent topic: Engine Cooling/Radiator
Document Number: 0000120053
Manual Publication Date: 2025-01-08
Topic Publication Date: 2025-01-08