High-Quality 4BT3.9 & 6BT5.9 Engine Parts – V-Ribbed Belt Pulley Fan Belt (3939710, 3911584)
Precision-engineered for Cummins 4BT3.9 and 6BT5.9 engines, this OEM-grade V-ribbed belt pulley ensures optimal power transmission with zero slippage. Made from reinforced rubber and high-tensile fiber cord for extreme durability, it withstands heat, oil, and heavy-duty vibrations. CNC-machined aluminum pulley core guarantees perfect alignment, reducing wear on adjacent components. Direct replacement for part numbers 3939710 and 3911584, compatible with industrial machinery, construction equipment, and marine engines. Stocked in bulk for wholesale buyers – global shipping, unbeatable pricing. Upgrade your fleet’s reliability without downtime.