Overview
The ZF 4661.125.003 INDUCTIVE SENSOR is a precision electronic component designed to monitor rotational speed and shaft position within the WG90, WG94, and WG98 series transmissions. This OEM genuine part transmits critical data to the transmission control unit, ensuring precise gear engagement and clutch modulation. Installed directly into the 4660101015 TRANSMISSION HOUSING, the sensor detects ferrous targets on rotating elements without physical contact. The SKU 4661.125.003 replaces worn or failed sensors to restore factory-level shift quality and prevent driveline damage. Its robust construction withstands high-temperature oil immersion and mechanical vibration common in heavy-duty industrial applications.
Symptoms of Failure
- Erratic gear engagement or delayed shifting – When the inductive sensor fails, the transmission control unit loses accurate speed data, causing harsh or hesitant shifts during acceleration.
- Transmission stuck in limp mode – A faulty 4661.125.003 often triggers diagnostic trouble codes, forcing the transmission into a reduced-power safety mode to prevent internal damage.
- Intermittent loss of torque converter lockup – Worn sensors produce erratic signals, leading to unexpected clutch slip and reduced fuel efficiency during highway operation.
- No start condition or false neutral – Complete sensor failure can prevent the transmission from recognizing gear selection, leaving the vehicle immobile despite engine running.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4661.125.003 |
| Sensor Type | Inductive (passive, two-wire) |
| Operating Voltage | 5–24 VDC |
| Output Signal | Variable reluctance (sine wave) |
| Housing Material | Stainless steel with PTFE seal |
| Thread Size | M12 x 1.5 |
| Overall Length | 55 mm |
| Weight | 0.045 kg |
| Temperature Range | -40°C to +150°C |
| Protection Rating | IP67 |
Compatibility
This inductive sensor is engineered for ZF WG series powershift transmissions, specifically the WG90, WG94, and WG98 models. It also fits the WG180, WG200, and WG210 variants used in construction and agricultural machinery. The sensor mounts into the 4660301054 HOUSING II and is secured with a 0631306174 CYLINDRICAL PIN to prevent rotation. Always verify the 0769123894 TYPE PLATE on your transmission to confirm exact model compatibility before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101015 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301054 | HOUSING II | Secondary housing for sensor mounting |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for sensor positioning |
| 0769123894 | TYPE PLATE | Identification plate with model data |
| 0750100022 | SCREW PLUG | Seals sensor bore in housing |
| 4660221029 | SUCTION TUBE | Oil pickup for lubrication system |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastens housing components |
| 0634306311 | O-RING | Seals cap screw interface |
| 4660321029 | FIXING PLATE | Retains sensor wiring harness |
