Overview
The ZF 4642.125.009 INDUCTIVE SENSOR is a critical electronic component designed specifically for the WG150 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, the sensor relays real-time data to the control unit, ensuring precise shift timing and clutch engagement. The SKU 4642.125.009 is engineered to withstand high temperatures and vibration, making it essential for reliable operation in heavy-duty commercial vehicles. When paired with a robust TRANSMISSION HOUSING, this sensor maintains signal integrity even under extreme loads.
Symptoms of Failure
- Erratic gear engagement or delayed shifting – A failing inductive sensor sends intermittent signals, causing the transmission to hesitate or slam into gears, especially during uphill climbs.
- Transmission slipping under load – When the sensor cannot detect shaft speed accurately, the control unit may disengage clutches prematurely, leading to power loss while hauling heavy loads.
- Check transmission light with speed sensor fault codes – Diagnostic trouble codes such as P0722 or P0723 often point directly to a worn 4642.125.009 sensor, requiring immediate replacement to avoid secondary damage.
- Intermittent loss of cruise control – Since the sensor feeds speed data to the engine management system, a degraded unit can cause cruise control to drop out unexpectedly on highways.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4642.125.009 |
| Sensor Type | Inductive (2-wire, normally open) |
| Operating Voltage | 10–30 VDC |
| Output Signal | Frequency proportional to speed (0–5 kHz) |
| Housing Material | Stainless steel with PTFE seal |
| Thread Size | M12 x 1.5 |
| Overall Length | 45 mm |
| Weight | 0.035 kg |
| OEM Reference | ZF 4642.125.009 |
Compatibility
This inductive sensor is primarily engineered for the ZF WG150 series transmission, but its mounting pattern and electrical characteristics also suit the WG180, WG200, and WG250 models. It replaces earlier variants in the 4642.125.xxx family. For proper installation, ensure the mating surface on the TRANSMISSION HOUSING is clean and free of debris. Always verify the TYPE PLATE on your unit to confirm the exact transmission revision, as later models may require a different sensor gap. The sensor is secured using a GROOVED STUD to prevent loosening from vibration.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4642301208 | TRANSMISSION HOUSING | Alternate housing variant for WG150 |
| 0730365125 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Fastener for sensor mounting |
| 4642301168 | SCREEN SHEET | Filter mesh for oil sump |
| 4642301169 | SCREEN SHEET | Alternative filter mesh variant |
| 0636100621 | HEXAGON SCREW | Bolt for housing fastening |
| 0630361029 | SEALING CAP | Protective cover for unused ports |
| 4642306254 | ADAPTER | Converter for sensor harness connection |
| 0634303340 | O-RING | Seal for sensor-to-housing interface |
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