JCB Viscous Fan Sensor (Rotational Speed) - OEM
Viscous fan clutch speed sensor in OEM quality, designed for advanced cooling systems in JCB JS series tracked and wheeled excavators. This component plays a vital role in intelligent engine temperature management by transmitting precise fan RPM data to the Engine Control Unit (ECU). This allows the system to smoothly regulate the engagement level of the viscous clutch, resulting in optimal cooling, reduced noise, and measurable fuel savings.
Specifications and Technical Features:
- Application: Monitoring radiator fan rotational speed.
- Type: Hall effect / inductive sensor (compliant with JCB OEM specifications).
- Connector: Hermetic, resistant to vibration and high temperatures within the engine compartment.
- Function: Prevention of engine overheating through precise control of the viscous system operation.
Compatibility with JCB Machinery:
| Machine Category | Models and Variants |
|---|
| Tracked Excavators (JS Tracked) |
JS 115, JS 130, JS 145, JS 160, JS 180, JS 190, JS 200, JS 210, JS 220, JS 235, JS 240, JS 260 |
| Wheeled Excavators (JS Wheeled) |
JS 145, JS 160, JS 175, JS 20, JS 200 |
Technical Advice: Damage to the viscous sensor often manifests as "Fan Speed Error" fault codes or a sudden increase in engine temperature under heavy load, despite a functional water pump. Before replacing the sensor, it is worth checking the condition of the wiring harness leading to the fan clutch—in JS series machines, these wires are prone to chafing near the fan shrouds. A correctly functioning sensor prevents the fan from operating in "full power" (fail-safe) mode, which significantly reduces engine load and fuel consumption.
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