High-Volume Lubrication Engineered for Severe-Duty Industrial Operations High-displacement heavy machinery engines like the Caterpillar 3406 and 3406B series are subject to immense mechanical loads and prolonged operating hours. Optimal oil circulation is vital to dissipate friction heat and prevent metal-on-metal wear on crankshaft journals and cam lobes. Our Premium Aftermarket 4N0733 Oil Pump is engineered using premium high-density cast iron …