Cummins Diesel Engine Accessory Drive Pulley 3332325 QSK95

Unlike the low-priced and low-quality 'universal fit' pulleys on the market, this product strictly follows the original design specifications to ensure that:

• Tooth shape matching - An exact replica of the OEM belt groove angle and spacing, eliminating the risk of abnormal belt wear.

• Bore tolerance ±0.01mm - Zero clearance with crankshaft or idler shaft to avoid loosening of bushings caused by long-term operation.

• Dynamic balancing grade G6.3 - meets the vibration control requirements of NTA855 under high speed conditions (up to 2800 RPM).

Material Science: Application of High Strength Alloy Steel

Most sub-factory pulleys use ordinary cast iron or low-grade steel, while this product uses SAE 4140 alloy steel, which is tempered and heat-treated to achieve the following properties:

• Tensile strength ≥ 850 MPa - more than 3 times higher than cast iron (~250 MPa), eliminating the risk of cracking.

• Surface hardness HRC 28-32 - tooth surface strengthened by high-frequency quenching process, life expectancy extended to 2.5 times of normal parts.

Solve the problem of shortage of spare parts for old models

As NTA855 engines are gradually discontinued, the supply of original pulleys (such as the old version 3332325) is unstable and expensive. This compatible part provides:

• 100% size interchangeability: direct replacement for original parts without modifying brackets or adjusting belt length.

• Stock guaranteed: for sub-models G1/G2/G3, always in stock, reducing downtime and waiting time.

Suitable for the following NTA855 derivatives (check engine serial number prefix):

• NTA855-G1 (1980-1995 models)

• NTA855-G2/G3 (version with PTO interface)

• KTTA855-C (marine conversion model)

4.2 Key steps for installation

• Remove the old wheel - Use a pulling horse tool to avoid damage to the crankshaft threads.

• Clean Shaft End - Remove burrs with 1200 grit sandpaper to ensure a flat contact surface.

• Torque tightening - Apply 210±10 N-m torque as per OE standard and tighten the crossover in 3 passes.

• Belt Tension Check - Adjust to 90 - 100 lbf (pound-force) with a tension gauge. Excessive deviation will result in premature bearing damage.