CUMMINS 3910739 OEM FAN HUB BEARING – RAM 5.9L/6.7L (1989–2018)

Keep the engine-driven cooling fan on your Dodge Ram 5.9L or 6.7L Cummins smooth, quiet, and safe with the genuine Cummins 3910739 fan hub bearing. This OE ball bearing is engineered for the fan clutch bracket/hub and uses factory-correct dimensions (35 mm ID × 64 mm OD × 37 mm width) for a precise press fit and long service life.

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Why Choose Genuine Cummins 3910739

• OE Cummins ball bearing for the fan hub assembly – not a generic “will-fit” piece.
• Direct-fit for 1989–2018 Ram 2500/3500 5.9L and 6.7L Cummins fan hub applications (verify by ESN/VIN).
• Correct 35×64×37 mm dimensions for proper press fit and alignment.
• Helps eliminate fan wobble, squeal, and vibration that can damage the fan clutch and belt drive.
• Ideal preventive maintenance whenever the fan hub is noisy, loose, or being rebuilt.

Quick Specs

• Brand: Cummins (Genuine OEM)
• Part Number: 3910739
• Type: Ball bearing for engine cooling fan hub / fan drive
• Core Dimensions: ~35 mm ID × 64 mm OD × 37 mm width
• Applications: Ram 2500/3500 5.9L & 6.7L Cummins, plus various ISB/4B/6B industrial fan drives (verify ESN)
• Quantity Required: 1 bearing per fan hub (sold individually)

Verified Ram Fitment

Fits the fan hub bearing pocket on the following Dodge/Ram Cummins trucks (verify by VIN/ESN and hub style):

• 1989–1993 Ram 2500/3500 – 5.9L 12-valve 6BT
• 1994–1998 Ram 2500/3500 – 5.9L 12-valve 6BT
• 1998.5–2002 Ram 2500/3500 – 5.9L 24-valve ISB (VP44)
• 2003–2007 Ram 2500/3500 – 5.9L ISB (common-rail)
• 2007.5–2018 Ram 2500/3500 – 6.7L ISB (common-rail)

Note: The same bearing size is also used on many Cummins 4BT/6BT/ISB industrial and off-highway fan hubs. Always confirm by engine serial number (ESN) and hub casting.

Cross-Reference Numbers

This genuine Cummins bearing cross-references several common OEM and aftermarket numbers:

• Cummins: 3910739 (primary), 4942086 (related OE reference)
• Dodge/Chrysler: 4429639
• PAI: 180935
• NTN / NSK / Industry: DF0766LUA, BD35-12DU8A (bearing construction equivalent)

Often Paired With

Customers frequently pair the 3910739 fan hub bearing with other bottom-end and rotating assembly hardware during a refresh:

• CUMMINS 3908522 OEM FLEX PLATE BOLT – RAM 5.9L/6.7L (1989–2018)
• CUMMINS 4955853 OEM MAIN BEARING SET (STANDARD) – RAM 5.9L/6.7L (1989–2018)
• CUMMINS 4955856 OEM MAIN BEARING SET (.010) – 5.9L/6.7L (1989–2018)
• CUMMINS 4955858 OEM MAIN BEARING SET (.030) – RAM 5.9L/6.7L (1989–2018)
• CUMMINS 4938948 OEM CRANKSHAFT THRUST BEARING – 5.9L/6.7L (1989–2018)

What’s In The Box

• (1) Genuine Cummins fan hub ball bearing – PN 3910739
• Fan hub/bracket, fan clutch, and fan blade sold separately

Install Tips

• Use a press with the correct adapters; never drive the bearing through the rolling elements.
• Support the hub fully and press the bearing squarely into the bore.
• Verify pulley and belt alignment before startup to avoid belt walk and premature wear.
• If the old bearing seized, inspect the fan clutch, fan blades, and serpentine belt for damage.

FAQ

In most cases, yes. This bearing is listed for 1989–2018 Ram 2500/3500 trucks with 5.9L or 6.7L Cummins engines that use the OE fan hub design. Always confirm fitment by VIN/ESN and compare your existing bearing dimensions (35 mm ID × 64 mm OD × 37 mm width).

The typical dimensions are approximately 35 mm inner diameter, 64 mm outer diameter, and 37 mm width. This matches the OE Cummins hub bearing spec used on Ram 5.9L/6.7L fan drive assemblies.

Common symptoms include squealing or growling noises from the front of the engine, noticeable fan wobble, and visible belt misalignment. If the hub locks up, you may also see belt smoke or thrown belts. Replace the bearing promptly to prevent damage to the fan clutch, shroud, radiator, or belt drive.

This listing is for a genuine Cummins 3910739 ball bearing supplied through CPP Diesel. Aftermarket bearings may reference the same dimensions or cross-reference numbers, but OE Cummins parts are built to the original engineering spec and quality control standards.

A shop press and appropriately sized drifts or bearing drivers are strongly recommended. Avoid hammering on the bearing or applying force through the balls/rollers. If you are not equipped with a press, most machine shops or repair shops can press the bearing into your hub for a small fee.

Specifications for cummins 3910739