Overview
The ZF 4644.107.003 SPEEDOMETER is a critical output speed sensor designed specifically for the WG180 and WG200 transmission series. This OEM genuine part, identified by SKU 4644.107.003, mounts directly into the transmission housing to monitor rotational speed of the output shaft. It converts mechanical rotation into an electronic signal for the vehicle’s dashboard and ECU, ensuring accurate speed readings and proper shift timing. Without this component, the transmission cannot relay speed data, which is essential for load management and gear selection. This speedometer interfaces seamlessly with the 4644101043: TRANSMISSION HOUSING and the 4644301194: TRANSMISSION HOUSING to maintain structural integrity and signal accuracy.
Symptoms of Failure
When the ZF 4644.107.003 speedometer begins to fail, operators often notice erratic speedometer needle behavior, such as sudden drops to zero or wild fluctuations while driving at steady speeds. Another common symptom is the transmission entering limp mode or failing to upshift, as the control unit loses critical speed input. You may also observe a persistent check engine light or transmission warning lamp on the dashboard, often accompanied by diagnostic trouble codes related to output speed sensor circuits. In severe cases, the vehicle may experience harsh or delayed gear engagements, mimicking internal mechanical wear. These issues are frequently misdiagnosed, so verifying the speedometer signal is a smart first step before inspecting the 0730365067: TYPE PLATE for correct model identification.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.107.003 |
| OEM Reference | ZF 4644.107.003 |
| Material | Reinforced thermoset plastic with brass insert |
| Weight | 0.12 kg (0.26 lbs) |
| Overall Length | 68 mm |
| Thread Size | M18 x 1.5 |
| Output Signal | Hall effect, 3-wire (VCC, GND, Signal) |
| Operating Voltage | 12V DC (nominal) |
| Operating Temperature | -40°C to +125°C |
| Sealing Type | O-ring integrated |
Compatibility
This speedometer is engineered for the ZF WG180 and WG200 series transmissions, which are heavy-duty powershift units used in construction and agricultural machinery. It is a direct fit for all WG180 variants (including WG180/181/182) and WG200 models (WG200/201/202). The sensor mounts in the rear housing section, adjacent to the output flange. When replacing this part, always verify the 0631311009: GROOVED STUD is properly torqued to prevent vibration damage to the sensor body. This part is not compatible with older ZF Ecomat or AS Tronic series without adapter harness modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101043 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301194 | TRANSMISSION HOUSING | Rear housing section for output assembly |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Fastener for housing alignment |
| 4644303060 | COVER PLATE | Access cover for speedometer cavity |
| 4644303061 | COVER PLATE | Alternate cover plate variant |
| 0634801098 | SEALING RING | O-ring for sensor port seal |
| 0634801250 | SEALING RING | Larger O-ring for housing joint |
| 0636305026 | SCREW PLUG | Drain/fill plug for housing |
| 0636305019 | SCREW PLUG | Magnetic plug for debris collection |
