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Cummins  |  SKU: 3908803

3908803 | Genuine Cummins® Engine Cooling Fan Strut Support

$59900
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Description:
A Fan Support 3908803 is a structural component that holds and supports the engine cooling fan assembly and keeps it properly aligned with the radiator and drive system.

Part Number: 3908803
Condition: New
Manufacture/Brand: Cummins

Fits 3908803 For Cummins Engines 4B, 4BT, 4BTA, 6B, 6BT, 6BTA, 4B3.9, 6B5.9, 6C8.3, B3.9 CM2620 B171C, B4.5, B4.5 CM2350 B146C, B5.6 CM2670 B152B, B5.9 CM2880 B192G, B5.9 G, B5.9 GAS PLUS CM556, B5.9 LPG PLUS CM556, B6.7 CM2350 B121B, B6.7 CM2350 B136C, B6.7 CM2450 B155B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 CM2670 B173B, B6.7 CM2670 B188B, B6.7 CM2880 B191G, B6.7 G CMOH6.0 B125, B6.7N CM2380 B150B, B6.7S, B7 CM2670 B165C, G5.9, G5.9 CM558, ISB (Chrysler), ISB CM2150, ISB CM2150 E, ISB CM550, ISB CM850, ISB/ISD4.5 CM2150 B119, ISB/ISD4.5 CM2150 SN, ISB/ISD6.7 CM2150 SN, ISB/ISD6.7 CM2880 B126, ISB4.5 CM2150, ISB5.9 CM2880 B110, ISB5.9 CM2880 B140, ISB5.9 CM800, ISB5.9G CM2180, ISB6.7 CM2250, ISB6.7 CM2350 B101, ISB6.7 G CM2180 B118, ISBE CM2150, ISBE CM800, ISBE4 CM850, ISC CM2150, ISC8.3 CM2250, ISL CM554, ISL CM850, NH/NT 855, QSB (Komatsu), QSB3.3 CM2150, QSB3.9 30 CM550, QSB4.5 30 CM550, QSB4.5 CM2150 B108, QSB4.5 CM2250 EC, QSB4.5 CM2350 B106, QSB4.5 CM2350 B122, QSB4.5 CM2350 B174C, QSB4.5 CM850(CM2850), QSB5.9 30 CM550, QSB5.9 44 CM550, QSB5.9 CM550, QSB5.9G, QSB6.7 CM2250, QSB6.7 CM2250 EC, QSB6.7 CM2350 B105, QSB6.7 CM2350 B112, QSB6.7 CM2350 B130, QSB6.7 CM2670 B170C, QSB6.7 CM2670 B185C, QSB6.7 CM2880 B116, QSB6.7 CM850(CM2850), QSB7 CM2880 B117

Hyundai Forklift: 110/130/160D-7A, 110/130/160D-9
Hyundai Dozer: H70/LGP, H80/LGP
Hyundai Wheel Loader: HL730-7A, HL730-9A, HL730-9S, HL730TM-7A, HL730TM-9A, HL740-F, HL740-7A, HL740-7S, HL740-9A, HL740-9B, HL740-9S, HL740TM-7A, HL740TM-F, HL740TM-9A, HL757-F, HL757TM-F, HL757-7A, HL757-9A, HL757TM7A, HL757TM-9A, HL760-F, HL760-7, HL760-7A, HL760-9A, HL940, HL940TM, HL955, HL955TM, HL960
Hyundai Excavator: HW140, HW210, HX220 L, HX220 NL, HX235 LCR, HX260 L, HX300 L, R140W-9A, R160W-9A, R180W-9A, R210W-9A, R210W9AMH, R220LC-9A, R220NLC-9A, R235LCR-9, R235LCR-9A, R250LC-7, R260LC-9A, R300LC-9A

Purpose of using 3908803:

1. Support the Cooling Fan

The fan support:

  • Holds the fan hub and shaft

  • Keeps the fan centered

  • Prevents wobbling during rotation

This is critical because engine cooling fans are large and heavy, especially on diesel trucks.

2. Maintain Proper Alignment

It keeps the fan aligned with:

  • The radiator

  • The fan shroud

  • The drive belt or gear system

Proper alignment prevents:

  • Belt wear

  • Bearing damage

  • Vibration

3. Support the Fan Clutch (If Equipped)

On many heavy-duty vehicles (such as those from Freightliner Trucks or Volvo Trucks), the fan support also holds the fan clutch assembly.

The fan clutch mounts directly to the fan support shaft.

4. Reduce Engine Vibration Stress

The fan support contains bearings that:

  • Allow smooth rotation

  • Absorb rotational forces

  • Reduce stress on engine components

5. Ensure Proper Engine Cooling

Without a stable fan support:

  • The fan may not pull air correctly

  • Cooling efficiency drops

  • The engine may overheat


Sings of Bad Engine Cooling Fan Strut Support 3908803:

1. Fan Wobbling

  • Cooling fan visibly shakes while spinning

  • Fan blades look uneven

  • Movement side-to-side when engine is running

This usually means worn internal bearings.

2. Grinding or Growling Noise

  • Noise coming from front of engine

  • Gets louder with RPM

  • Sounds like a bad wheel bearing

Worn fan support bearings commonly cause this.

3. Squealing or Chirping Noise

  • High-pitched noise

  • May change with engine speed

Can indicate:

  • Failing bearings

  • Misalignment affecting the drive belt

4. Excessive Vibration

  • Front of engine vibrating

  • Shaking felt in cab (heavy trucks especially)

A loose or worn shaft can cause imbalance.

5. Overheating Engine

If the fan support is failing:

  • Fan may not spin properly

  • Airflow through radiator decreases

  • Engine temperature rises

6. Belt Wear or Throwing Belts

On belt-driven systems:

  • Belt frays quickly

  • Belt squeals

  • Belt jumps off pulley

Misalignment from worn fan support causes this.

7. Play in the Fan Shaft (Manual Check)

With engine OFF:

  • Grab the fan

  • Try to move it forward/backward or side-to-side

If there is noticeable movement, bearings may be worn.

8. Oil or Grease Leakage

Some fan supports are grease-lubricated:

  • Visible grease leaking

  • Dry or rusty bearing housing

 

About the Manufacturer – Cummins:

Cummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.

The brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.

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