Overview
The ZF 4651.125.002 INDUCTIVE SENSOR is a critical electronic component engineered specifically for the WG 100 Series transmission family. This OEM genuine part monitors rotational speed and position of internal shafts by generating a magnetic field that detects ferrous targets without physical contact. Mounted directly into the transmission housing, the sensor sends real-time data to the control unit to ensure precise gear engagement and clutch modulation. The SKU 4651.125.002 is factory-calibrated for exact signal output, guaranteeing seamless integration with your ZF drivetrain. When replacing this sensor, always inspect the adjacent 4651101009: TRANSMISSION HOUSING for cracks or wear that could compromise sensor alignment.
Symptoms of Failure
- Erratic shifting or gear hunting: A failing inductive sensor sends intermittent or false speed signals, causing the transmission to shift unpredictably between gears, especially under load.
- No start or crank inhibit: The sensor failure can prevent the transmission control module from detecting output shaft rotation, leading to a “no start” condition or starter lockout.
- Check transmission warning light: The vehicle’s diagnostic system will log fault codes related to missing or implausible speed signals, illuminating the warning lamp on the dash.
- Harsh engagement or clutch slip: Without accurate shaft speed data, the transmission may apply clutches too aggressively or fail to hold pressure, resulting in jerky takeoffs or power loss.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4651.125.002 |
| Type | Inductive Proximity Sensor (2-wire) |
| Operating Voltage | 10–30 VDC |
| Output Signal | Frequency / Pulse Train |
| Housing Material | Stainless Steel (AISI 303) |
| Thread Size | M12 x 1.5 |
| Overall Length | 55 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 4651.125.002 |
| Sealing | IP67 Rated |
Compatibility
This inductive sensor is a direct fit for the ZF WG 100 Series transmissions, including models WG100, WG120, WG150, WG180, and WG200. It is also compatible with certain WG 80 variants used in medium-duty applications. The sensor mounts into a dedicated bore in the 4651301025: HOUSING or the 4651301031: HOUSING, depending on the specific transmission revision. Always verify the thread depth and O-ring groove condition; replace the 0634303928: O-RING during installation to prevent oil ingress.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101009 | TRANSMISSION HOUSING | Main structural casing that supports sensor mounting |
| 4651301025 | HOUSING | Intermediate housing for sensor bore alignment |
| 0634303928 | O-RING | Seals sensor-to-housing interface |
| 4651301031 | HOUSING | Alternate housing variant for WG100 |
| 4651203002 | SCREEN SHEET | Filter mesh for oil flow protection |
| 4651303005 | SCREEN SHEET | Secondary filter screen for valve body |
| 0636101032 | CAP SCREW | Fastener for housing assembly |
| 0630361028 | SEALING CAP | Protective cap for unused sensor ports |
| 4475280060 | SCREW PLUG | Threaded plug for oil passages |
| 0634303312 | O-RING | Seal for screw plug or cap |
