Oil Pump 4939587 High Performance Lubrication Pump for Cummins 6bt5.9 Engine. Reliable Oil Pressure Supply Ensures stable engine oil circulation and maintains proper lubrication pressure for Cummins 6BT5.9 diesel engines. OEM Standard Compatibility Manufactured according to original Cummins specifications, fully compatible with OE number 4939587. Improved Engine Protection Reduces friction and wear between engine components, helping extend engine service life. High Strength Material Construction Built with durable alloy materials for excellent resistance to high temperature and heavy load conditions. Precision Machining Process CNC-machined components ensure accurate fitting, smooth operation, and reduced internal leakage. Stable Performance Output Delivers consistent oil flow even under continuous heavy-duty operation and long-distance driving. Low Noise and Vibration Optimized internal gear design helps reduce noise and improve overall engine working comfort. Easy Direct Replacement Designed for plug-and-play installation with no modification required, saving maintenance time and cost.