Overview
The ZF 4646.125.001 INDUCTIVE SENSOR is a precision electronic component engineered for the WG250 transmission series. This OEM genuine part monitors rotational speed and position within the gearbox, converting mechanical motion into electrical signals for the transmission control unit. Positioned near the output shaft or clutch assembly, the sensor ensures accurate shift timing and torque management. The SKU 4646.125.001 is a direct replacement for factory-installed units, guaranteeing seamless integration with your existing ZF drivetrain. When paired with a robust TRANSMISSION HOUSING, this sensor maintains signal integrity under high-vibration conditions.
Symptoms of Failure
- Erratic gear engagement or slipping: A failing inductive sensor sends intermittent signals, causing the transmission to hesitate or slip between gears, especially under load.
- Incorrect speedometer or tachometer readings: When the sensor degrades, the ECU receives false RPM data, leading to erratic dashboard readings and potential limp-home mode activation.
- Harsh or delayed shifting: Worn sensors disrupt shift-point calculations, resulting in jarring gear changes or delayed upshifts during acceleration.
- Check transmission warning light: The control module detects signal loss from the 4646.125.001 and triggers a diagnostic trouble code, often accompanied by reduced performance.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4646.125.001 |
| Type | Inductive Proximity Sensor (2-wire) |
| Operating Voltage | 10–30 VDC |
| Output Signal | Frequency (pulse train) |
| Housing Material | Stainless steel with PBT plastic |
| Thread Size | M12 x 1.0 |
| Overall Length | 55 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 4646.125.001 |
Compatibility
This inductive sensor is specifically designed for the ZF WG250 series, but it also fits other WG-family transmissions including WG180, WG200, and WG240 models. The sensor is commonly used in off-highway vehicles, agricultural tractors, and construction equipment where the WG250 gearbox is installed. For proper fitment, verify that your transmission housing accommodates the M12 sensor port. The sensor works in conjunction with the HOUSING and COVER assemblies to seal the internal components. Secure installation requires a HEXAGON SCREW to lock the sensor in place.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Encloses gear train and sensor mounting point |
| 4646301095 | HOUSING | Secondary housing for clutch or valve body |
| 4646301087 | COVER | Seals the sensor cavity from debris |
| 0636015304 | HEXAGON SCREW | Fastens sensor to housing |
| 0636101828 | CAP SCREW | Secures cover plate |
| 4646301102 | COVER SHEET | Protects internal wiring harness |
| 4646301098 | COVER SHEET | Additional shielding for sensor connector |
| 0730365125 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for housing assembly |
| 0636101193 | CAP SCREW | Mounting bolt for valve body |
