Overview
The ZF 4661.125.006 INDUCTIVE SENSOR is a critical electronic component designed for precise rotational speed monitoring within the WG90, WG92, WG94, and WG98 transmission series. Mounted directly into the TRANSMISSION HOUSING, this OEM genuine part detects gear rotation and sends real-time data to the transmission control unit. The SKU 4661.125.006 ensures accurate shift timing and clutch engagement, making it essential for maintaining optimal performance in heavy-duty industrial applications. Without this sensor, the transmission cannot properly regulate hydraulic pressure or adapt to load changes.
Symptoms of Failure
- Erratic shifting or gear slipping: A failing 4661.125.006 sensor often sends intermittent signals, causing the transmission to hunt for gears or slip under load, especially during uphill operation.
- Check transmission warning light: The ECU detects missing or implausible speed data, triggering a dashboard warning and often locking the transmission in a limp-home mode.
- Delayed engagement or harsh shifts: Worn inductive sensors produce weak magnetic fields, leading to delayed clutch pack engagement and jarring gear changes that worsen over time.
- Incorrect speedometer readings: When the sensor fails, output shaft speed data becomes erratic, causing the vehicle speed display to fluctuate or drop to zero while driving.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4661.125.006 |
| Type | Inductive Proximity Sensor (2-wire) |
| Operating Voltage | 10–30 VDC |
| Output Signal | Frequency pulse (square wave) |
| Housing Material | Nickel-plated brass |
| Thread Size | M12 x 1.0 |
| Overall Length | 55 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 4661.125.006 |
| Sealing | IP67 rated |
Compatibility
This inductive sensor is engineered for ZF WG series powershift transmissions, specifically the WG180, WG200, WG210, and WG250 models. It is a direct replacement for units in the WG90, WG92, WG94, and WG98 series, which are commonly found in construction equipment, mining trucks, and agricultural machinery. The sensor interfaces with the HOUSING II and is secured using a CYLINDRICAL PIN to prevent rotation during vibration. Always verify the TYPE PLATE on your transmission to confirm compatibility before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4660301054 | HOUSING II | Secondary housing for clutch pack support |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for sensor mounting |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 0750100022 | SCREW PLUG | Seals oil passages in the housing |
| 4660221029 | SUCTION TUBE | Oil pickup from transmission pan |
| 0634100317 | O-RING | Seals sensor bore against oil leakage |
| 0636103273 | CAP SCREW | Fastener for housing cover |
| 0634306311 | O-RING | Seals plug and tube connections |
| 4660321029 | FIXING PLATE | Retains sensor wiring harness |
