3062867 | Genuine Cummins® Oil Pressure Switch

1. Compatible Cummins® Engine Platforms

• Cummins® 4BT 3.9 / 6BT 5.9 / 6BTA5.9M3: 3.9L and 5.9L mid-range diesel engines used in commercial, industrial, and marine applications.

• Cummins® N14 / NTA855: Heavy-duty 14-liter highway and industrial engines (Select, Select Plus, and Mechanical series).

• Cummins® K19 / K38 / K50: High-horsepower industrial, mining, generator, and marine diesel engines.

• Cummins® L10 / M11 / ISM11: Commercial heavy-duty diesel engines.

• Cummins® VT903 / V903: High-output military and commercial engine series.

2. Vehicle & Equipment Applications

• • Class 8 Commercial Highway Trucks: Heavy-duty trucks from Freightliner®, International® / Navistar®, Kenworth®, Peterbilt®, and Western Star® powered by Cummins® N14, L10, M11, or 6BT engines.

  • Marine & Auxiliary Power: Marine propulsion and auxiliary engine units (e.g., 6BTA5.9M3 series) utilizing Cummins® mechanical and electronic monitoring systems.

  • Heavy Off-Highway & Mining Equipment: Mining haul trucks, excavators, and loaders from Komatsu®, Terex®, and Hitachi®.

  • Power Generation & Industrial: Industrial generator sets (G-Drive / Gensets) and Onan power equipment incorporating Cummins® K-Series, N-Series, and B-Series engines.

1. What is it?

Part is a threshold-activated electromechanical pressure switch. Threaded directly into an oil, fuel, or air gallery, it continuously monitors system pressure and opens or closes an internal electrical circuit once fluid pressure crosses a predetermined set point.

2. Core Functions & Technical Features

• Binary Threshold Control: Functions as a discrete circuit trigger (Normally Open or Normally Closed) rather than a continuously variable sensor, providing clean on/off signals for monitoring systems.

• Engine Protection Interlock: Transmits immediate status updates to dashboard warning lights, gauges, or the Engine Control Module (ECM) to flag loss of pressure before catastrophic mechanical wear occurs.

• Heavy-Duty Construction: Built with a solid brass/metallic body designed to withstand high operational vibration, severe thermal cycling, and aggressive engine fluids.

• Standard Industrial Threading: Features a heavy-duty NPT male threaded fitting that provides a leak-free mechanical seal in high-pressure engine galleries.

1. Continuous Low-Pressure Warning Light or Alarm

• Symptom: The dashboard warning light or alarm horn remains continuously active during engine operation, despite physical fluid levels and mechanical oil/fuel pressure being at normal operating levels.

• Cause: Internal contacts are stuck or welded in the closed/grounded position due to spring breakdown or contact pitting.

2. Complete Failure of Low-Pressure Warning Circuit

• Symptom: The warning light fails to illuminate during the key-on engine-off bulb test, or fails to alert the operator during a genuine loss of pressure.

• Cause: Internal electrical open circuit caused by corroded contacts, broken wire connections inside the switch housing, or heavy fouling on the sensing diaphragm.

3. Engine Shutdown or Protection Interlock Faults

• Symptom: The engine or generator set unexpectedly cuts off or refuses to remain running after start-up, citing a low-pressure fault on the control panel.

• Cause: The switch fails to transition its electrical state once operational pressure is established, signaling a zero-pressure condition to the ECM or control module.

4. Fluid Leaking Around Terminal / Connector Body

• Symptom: Fluid (oil or fuel) seeps through the top terminal housing or electrical plug connection.

• Cause: Internal diaphragm fatigue or seal perforation allowing pressurized media to bypass the mechanical chamber and enter the electrical housing.