Overview
The ZF 4644.125.001 INDUCTIVE SENSOR is a precision electronic component engineered for the WG150 and WG180 series transmissions. This OEM genuine part monitors rotational speed and position of internal shafts, sending critical data to the transmission control unit for precise shift timing and clutch engagement. Installed directly into the transmission housing, the sensor ensures that the gearbox operates within optimal parameters. The SKU 4644.125.001 is a direct replacement for the factory-installed unit, guaranteeing exact fitment and performance. When paired with a robust TRANSMISSION HOUSING, this sensor maintains the integrity of the entire assembly.
Symptoms of Failure
- Erratic gear shifting or slipping: A failing inductive sensor sends inconsistent signals, causing the transmission to shift harshly or slip between gears, especially under load.
- Incorrect speedometer or tachometer readings: When the sensor degrades, the dashboard may display fluctuating or zero speed readings, a common sign of sensor malfunction.
- Transmission stuck in limp mode: The control unit often defaults to a safe mode when it detects a faulty sensor, limiting the vehicle to a single gear and reduced power.
- Delayed engagement when shifting from Park to Drive: A worn sensor can cause a noticeable lag before the transmission engages, accompanied by a brief loss of hydraulic pressure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.125.001 |
| Type | Inductive Proximity Sensor |
| Operating Voltage | 10-30 V DC |
| Output Signal | Frequency / Pulse Width Modulation |
| Housing Material | Stainless Steel / Thermoplastic |
| Thread Size | M12 x 1.5 |
| Weight | Approx. 35 g |
| OEM Reference | ZF 4644.125.001 |
| Operating Temperature | -40°C to +125°C |
Compatibility
This inductive sensor is specifically designed for ZF WG150 and WG180 series transmissions. It is also compatible with the WG200 series in certain configurations, provided the mounting boss and wiring harness match. The sensor interfaces directly with the transmission control module and is secured within the TRANSMISSION HOUSING. For proper identification, always verify the TYPE PLATE on your unit, which lists the exact model and serial number. Additionally, the sensor is often installed near the GROOVED STUD that anchors the shift mechanism.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG180 |
| 0730365125 | TYPE PLATE | Identification plate with model and serial |
| 0631311009 | GROOVED STUD | Mounting stud for shift linkage |
| 4642301168 | SCREEN SHEET | Filter screen for oil sump |
| 4642301169 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 4642301186 | SCREEN SHEET | Secondary oil strainer |
| 4644106085 | SHIFT SYSTEM | Complete shift actuator assembly |
| 4642306050 | COVER PLATE | Sealing plate for sensor access port |
