Overview
The ZF 0501.334.444 SPEED SENSOR is a critical electronic component designed for precise rotational speed monitoring within the WG100, WG130, and WG131 transmission series. This OEM genuine part, identified by SKU 0501.334.444, mounts directly into the transmission housing to capture real-time data from the output shaft. It converts mechanical rotation into electrical signals, which the control unit uses to manage shift timing, torque converter lockup, and overall drivetrain efficiency. Without this sensor, the transmission cannot accurately determine vehicle speed, leading to erratic performance. When replacing this unit, it is common to inspect the 4699101113: HOUSING for cracks or debris that could affect sensor alignment.
Symptoms of Failure
- Erratic or no speedometer reading: A failing 0501.334.444 sensor often causes the speedometer to drop to zero or fluctuate wildly while driving.
- Harsh or delayed gear shifts: Without accurate speed data, the transmission control unit may shift too early or too late, causing jerky engagement.
- Transmission stuck in limp mode: The system may default to a single gear (usually 3rd) to protect internal components when the sensor signal is lost.
- Check engine or transmission warning light: Diagnostic trouble codes (DTCs) related to “output speed sensor circuit” frequently accompany this failure.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 0501.334.444 |
| Sensor Type | Hall Effect / Inductive (variable reluctance) |
| Housing Material | Glass-filled nylon with brass insert |
| Weight | Approx. 45 grams (0.1 lbs) |
| Connector Type | 2-pin Deutsch DT series |
| Operating Temperature | -40°C to +150°C |
| Output Signal | Square wave (frequency proportional to speed) |
Compatibility
This speed sensor is engineered specifically for ZF WG series transmissions, including the WG100, WG130, and WG131 models. It is also compatible with certain variants of the WG180 and WG200 series where the output shaft sensor port matches the M18x1.5 thread pattern. Always verify the sensor bore depth in your housing; the 4699102157: INPUT and 4699103114: OUTPUT shafts must be free of magnetic debris for accurate readings. For heavy-duty applications, pairing this sensor with a 4699025039: GP25 gear pump ensures consistent hydraulic pressure during speed signal processing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699025039 | GP25 | Gear pump for hydraulic pressure supply |
| 4699101113 | HOUSING | Main transmission housing casting |
| 4699102157 | INPUT | Input shaft assembly |
| 4699103114 | OUTPUT | Output shaft with speed sensor tone ring |
| 4699109068 | BRAKE PARTS | Internal brake components for PTO engagement |
| 4699301201 | HOUSING | Rear housing section |
| 4699309202 | HOUSING COVER | Sealing cover for control unit cavity |
| 0636101477 | CAP SCREW | M10x30 bolt for sensor retention |
| 0631302221 | CYLINDRICAL PIN | Alignment pin for sensor housing |
| 0501319149 | SCREW PLUG | Oil drain plug for sensor cavity |
