Overview
The ZF 4651.125.004 INDUCTIVE SENSOR is a critical electronic component engineered specifically for the WG 100 series transmission. 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, it sends precise signals to the control unit to regulate gear engagement and clutch modulation. The SKU 4651.125.004 ensures exact fitment and reliable performance, replacing worn or failed sensors to restore factory-level shift quality. This sensor integrates seamlessly with the 4651101007: TRANSMISSION HOUSING and the 4651301029: HOUSING, forming a sealed assembly that withstands high-pressure oil environments.
Symptoms of Failure
- Erratic shifting or gear slipping — When the inductive sensor degrades, the transmission control module receives intermittent or false speed data, causing harsh shifts or unexpected neutral conditions during acceleration.
- Transmission warning light activation — A failing 4651.125.004 often triggers diagnostic trouble codes (DTCs) related to input/output speed sensor circuits, illuminating the dash warning lamp.
- No start or delayed engagement — If the sensor fails completely, the control unit cannot detect shaft rotation, preventing the transmission from engaging drive or reverse until the part is replaced.
- Incorrect torque converter lockup — A worn sensor may cause the torque converter clutch to lock or unlock at wrong speeds, leading to shuddering or reduced fuel economy.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4651.125.004 |
| Type | Inductive Proximity Sensor |
| Operating Voltage | 10–30 V DC |
| Output Signal | Digital (Frequency/ Pulse) |
| Housing Material | Stainless Steel / Thermoplastic |
| Thread Size | M12 x 1.5 |
| Weight | Approx. 45 g |
| OEM Reference | ZF 4651.125.004 |
| Sealing | IP67 Rated |
Compatibility
This sensor is primarily designed for the ZF WG 100 series transmissions, including models such as WG100, WG120, WG150, WG180, and WG200. It is also used in select off-highway and industrial drivelines where ZF’s modular transmission architecture is employed. For proper installation, ensure the 0634303928: O-RING is replaced simultaneously to maintain oil-tight sealing around the sensor bore. Additionally, the 4651301024: HOUSING must be inspected for cracks or wear when servicing the sensor.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4651301029 | HOUSING | Secondary housing for sensor mounting |
| 0634303928 | O-RING | Seals sensor-to-housing interface |
| 4651301024 | HOUSING | Alternate housing variant for WG series |
| 4651203002 | SCREEN SHEET | Filters debris from oil flow |
| 4651303005 | SCREEN SHEET | Secondary filtration element |
| 0636101032 | CAP SCREW | Fastens housing components |
| 0630361028 | SEALING CAP | Protects unused sensor ports |
| 4475280060 | SCREW PLUG | Closes oil passages |
| 0634303312 | O-RING | Seals screw plug or cap |
