CAT Fan Pully 1W-5039

CAT Hub-Fan Pulley | P/N 1W-5039

The CAT 1W-5039 Fan Pulley is a genuine-style hub fan pulley designed to drive the engine cooling fan via the belt system. Built for durability in harsh operating conditions, this pulley plays a critical role in maintaining correct fan speed and reliable engine cooling on Caterpillar equipment.

Key Features

• Heavy-duty hub-style fan pulley design

• Precision-machined for accurate belt alignment

• Designed to handle continuous load and vibration

• Maintains correct fan speed for effective cooling

• Suitable for mining, earthmoving, construction, and industrial applications

Common Applications (guide only)

This part is commonly used on Caterpillar engines and machines, including but not limited to:

• CAT engine cooling fan drive systems

• Equipment fitted with belt-driven fan hubs

• Frequently seen on older and mid-range CAT engines such as:

  • 3300-series engines (e.g. 3306)

  • 3400-series engines (e.g. 3406)

• Wheel loaders, dozers, graders, and industrial power units using compatible fan hub assemblies

Exact fitment depends on engine arrangement and serial number — always confirm before ordering.

Specifications

• Part Number: 1W-5039

• Type: Fan Pulley / Hub-Fan Pulley

• Make: Caterpillar (CAT-style replacement)

• Mounting: Hub-mounted

• Function: Drives engine cooling fan via belt system

• Material: Heavy-duty cast / machined steel (industrial grade)

Why Replace the Fan Pulley?

• Worn or damaged pulleys can cause:

  • Belt misalignment or premature belt failure

  • Reduced fan speed and overheating

  • Excess vibration in the fan drive system

• Replacing the pulley helps restore:

  • Correct belt tracking

  • Reliable airflow through the radiator

  • Long-term cooling system performance

Notes

• Check engine serial number and fan hub configuration before purchase

• Professional installation recommended

• Belts, hubs, and fan assemblies sold separately unless stated