Overview
The ZF 4651.125.003 INDUCTIVE SENSOR is a critical electronic component designed for the WG100 series of ZF industrial transmissions. This OEM genuine part monitors rotational speed and position of internal shafts by generating a magnetic field that detects ferrous targets without physical contact. Installed directly into the transmission housing, the sensor relays real-time data to the transmission control unit (TCU) to ensure precise gear engagement and clutch modulation. The SKU 4651.125.003 is engineered to withstand high vibration and temperature extremes common in heavy-duty applications. For proper sealing and alignment, this sensor is often installed alongside the 4651101007 TRANSMISSION HOUSING and the 4651301029 HOUSING to maintain structural integrity.
Symptoms of Failure
- Erratic gear shifting or delayed engagement: When the inductive sensor fails, the TCU receives inaccurate speed data, causing harsh or delayed shifts, especially under load.
- Transmission enters limp mode: A faulty 4651.125.003 often triggers diagnostic trouble codes (DTCs) that force the transmission into a reduced-power safety mode to prevent damage.
- Intermittent loss of torque converter lockup: The sensor’s inability to detect turbine speed leads to fuel-wasting converter slip and elevated operating temperatures.
- No start or stall conditions: Complete sensor failure can prevent the TCU from confirming shaft rotation, resulting in a no-crank or immediate stall after engagement.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4651.125.003 |
| Type | Inductive Proximity Sensor (2-wire) |
| Housing Material | Stainless Steel / Nickel-Plated Brass |
| Thread Size | M12 x 1.5 |
| Overall Length | 45 mm (approx.) |
| Weight | 28 g (approx.) |
| OEM Reference | ZF 4651.125.003 |
| Operating Voltage | 10-30 VDC |
| Protection Rating | IP67 |
Compatibility
This genuine ZF inductive sensor is primarily designed for the WG100 series transmission family. Based on its mounting configuration and electrical characteristics, it is also compatible with the following ZF models: WG180, WG200, WG210, and WG250 series. Always verify the sensor’s thread pitch and connector type against your specific transmission variant. For complete assembly, ensure the 0634303928 O-RING is replaced to prevent oil ingress, and inspect the 4651301024 HOUSING for cracks that could misalign 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 bore against fluid leaks |
| 4651301024 | HOUSING | Alternate housing variant for WG series |
| 4651203002 | SCREEN SHEET | Debris filter for hydraulic circuit |
| 4651303005 | SCREEN SHEET | Fine mesh filter for valve body |
| 0636101032 | CAP SCREW | Fastener for housing assembly |
| 0630361028 | SEALING CAP | Protects unused sensor ports |
| 4475280060 | SCREW PLUG | Closes hydraulic test points |
| 0634303312 | O-RING | Seals screw plug or cap screw |
