In the fields of heavy machinery, mining equipment, and backup power supply, Cummins QST30, QSK19, QSK38, QSK45, QSK50, QSK60 and other series of diesel engines are highly favored for their excellent performance. As the core component of its lubrication system, the pre-lubrication oil pump is the key to ensuring long engine life and low losses! Today, we will unveil the working principle and key usage points of Cummins pre-lubrication oil pump, helping you maintain equipment scientifically and extend engine life!
1, Pre lubrication oil pump: the lubrication guard before starting
Cummins pre-lubrication system ensures the formation of a stable oil film at the moment of engine start-up through periodic automatic lubrication or remote lubrication design, avoiding wear caused by dry friction. The core principle is as follows:
1. Working principle
Pre-lubrication before startup: Oil is extracted from the oil pan through an electric oil pump and delivered to the main oil passage and various friction surfaces through a one-way valve to ensure that the oil pressure quickly meets the standard during startup (such as QSK series, which requires a pressure of 28kPa or above).
Post shutdown protection: When the engine is shut down (speed drops to 90r/min), the pre-lubrication oil pump automatically starts, continuously supplying oil to cool the bearings and prevent high-temperature carbon deposition.
Gear pump structure: The active gear meshes with the driven gear to form a pressure difference, efficiently suction and discharge oil, and adjust the pressure through a pressure limiting valve to avoid overpressure damage.
2. System classification
Integral type：Integrated into the starter motor, suitable for compact models such as QSK19 and QST30, directly replacing traditional motors and shortening pre-lubrication time.
Remote type: independently installed on the engine bracket, connected to the oil pan through a hose, suitable for heavy-duty models such as QSK45 and QSK60, and flexibly adaptable to complex working conditions.
2, Usage precautions: Details determine lifespan
1. Installation specifications
The solenoid valve needs to be installed horizontally and at a 90° angle to the centerline of the crankshaft to avoid accidental triggering due to vibration; Stay away from high-temperature exhaust components to prevent component aging.
The length of the oil suction pipe should not exceed 1.5 meters, and the clamp should be reinforced to prevent resonance wear; The oil outlet pipe needs to be equipped with a one-way valve to prevent oil backflow.
2. Oil products and maintenance
Choose multi-stage lubricating oil, such as SAE 15W-40, which balances low-temperature fluidity and high-temperature viscosity to reduce cold start wear (recommended ambient temperature is shown in the table below).
Regularly check the oil pressure: The normal pre-lubrication pressure is 0.5-1.5 bar. If it is lower than 0.5 bar, check for stuck relief valves or clogged filter elements.
Cleaning and oil change: Change the oil filter every 500 hours to avoid metal shavings blocking the pipeline; Poor quality fuel will accelerate the wear of the fuel pump, so it is necessary to choose oil that meets the requirements.
3. Fault response
Low pressure alarm: Commonly seen in micro motion wear or spring failure of pressure relief valves, it is necessary to replace the improved valve core in a timely manner (cancel the plug-in structure, improve the reliability of reseating).
Winter start-up: It is strictly prohibited to use open flames to bake the oil pan! A preheating device should be used to heat the coolant to above 60 ℃, and low pour point engine oil (such as 5W series for -30℃ environment) should be selected.
3628757,3628965,3628997,3637969,4295505等.
3, Cummins Advantage: Technology Escort, Worry Free Throughout the Process
The Cummins pre-lubrication system adopts Holset turbocharging technology and precise control of electronic control modules, supporting 15 second quick start and load, meeting the requirements of harsh scenarios such as data centers. At the same time, the service provider provides original spare parts and professional maintenance to ensure efficient operation of the system, ensuring that your equipment's power never stops!
4, The list of part numbers for the pre lubrication oil pump is as follows:
3628757, 3628965, 3628997, 3637969, 4295505, etc.
