High-precision oil pressure switch sensor made in Japan to safeguard Yanmar diesel engines. Designed with a 1/8"-27 NPT thread and screw terminal, this normally closed (NC) pressure switch triggers instant dashboard or alarm warnings upon low oil pressure, protecting bearings and internal engine components from catastrophic failure.

⚙️Product Specifications & Technical Description

• Product Type: Oil Pressure Switch / Engine Oil Alarm Sensor

• Manufacturer: Yanmar (Made in Japan)

• Primary MPN: 121252-39450 (12125239450)

• EAN / GTIN: 4260718929889 (Update with your specific assigned GTIN if necessary)

• Thread Specification: 1/8"-27 NPT (1/8" PT)

• Connector Type: Screw Terminal

• Pressure Rating: 0.5 MPa

• Switching Type: Normally Closed (NC) – Grounds circuit when pressure drops below safety limit

• Operating Temperature: Rated for continuous oil exposure exceeding 120°C

• Universal Compatibility: Yes (Engine Block Mounting)

•  

🔄  Interchangeability & OEM Cross-Reference

Fully interchangeable with or replaces the following OEM part numbers across industrial, agricultural, and marine machinery:

• YANMAR: 121252-39450, 12125239450, 114250-39450 (Earlier versions), YM121252-39450, YM12125239450

• KOMATSU: YM121252-39450

• JOHN DEERE: M801160, AM100611

• TAKEUCHI: 121252-39450

• KOHLER: 25 755 33-S

• THERMO KING: 44-9111

• MUSTANG / GEHL: 121252-39450

• LOCUST: 00229016

•  

🚜  List of Applicable Engines & Equipment

1. Yanmar Diesel Engine Series:

• Yanmar 2-Cylinder Series: 2TNE68, 2TNV70

• Yanmar 3-Cylinder Series: 3TNE68, 3TNE74, 3TNE82, 3TNE84, 3TNE88, 3TNV70, 3TNV76, 3TNV82, 3TNV84, 3TNV88

• Yanmar 4-Cylinder Series: 4TNE84, 4TNE88, 4TNE94, 4TNE98, 4TNV84, 4TNV88, 4TNV94, 4TNV98

• Yanmar Marine Diesel Series:

  • Small Marine & Auxiliary: 1GM, 2GM, 3GM, 3JH Series

  • Utility / Commercial Marine: CH, CX, GH, KH, HA, KY Series

2. Agricultural & Utility Tractors:

• Yanmar Tractors: F18, F20, F24, FX18, FX20, FX24, YM180, YM187, YM330, YM1401, YM1500, YM1700, YM2000, YM2500, YM2610, YM2620, YM2820, YM3000, YM3110, YM4220, SA Series

• John Deere Tractors: 2210, 4010, 4110, 4115, 4210, 4310, 4410

• Cub Cadet & Other Compact Tractors

3. Construction Equipment & Machinery:

• Mini-Excavators: Komatsu (PC09, PC10, PC15, PC20, PC27, PC35, PC45, PC55MR), Takeuchi (TB Series), Hitachi (Zaxis)

• Skid Steers & Loaders: Gehl, Mustang, Wacker Neuson, ASV Posi-Track

• Microcars: Bellier, Chatenet, JDM, Microcar

4. Industrial Refrigeration & Power Generation:

• Transport Refrigeration: Thermo King, Carrier Transicold

• Generators: Generac, Kohler industrial diesel generators

•  

🛠️Features & Performance Highlights

• Instant Engine Safeguard: Detects pressure drops instantly to trigger warning lights or buzzers, preventing catastrophic engine failure, seized bearings, and thermal damage.

• Made in Japan Quality: Manufactured to strict Japanese OEM standards for superior signal accuracy and long service life compared to aftermarket knockoffs.

• Leak-Proof NPT Fit: Features a precision-cut 1/8"-27 NPT thread for a secure, leak-proof seal directly into the engine block.

• High Vibration & Temperature Resistance: Damped internal contacts withstand severe engine vibration and high oil temperatures (120°C+).