Overview
The ZF 4644.107.005 SPEEDOMETER is a precision-engineered OEM genuine component designed specifically for the WG180 and WG200 transmission series. This critical sensor assembly monitors output shaft rotation, converting mechanical motion into an electrical signal for the vehicle’s dashboard instrumentation. Positioned within the rear housing section of the transmission, the speedometer interfaces directly with the 4644101080: TRANSMISSION HOUSING to ensure accurate speed data is relayed to the operator. The SKU 4644.107.005 is manufactured to ZF’s exacting tolerances, guaranteeing seamless integration and long-term reliability in heavy-duty industrial applications.
Symptoms of Failure
- Erratic or fluctuating speed readings: When the 4644.107.005 speedometer gear or internal magnet wears, the signal becomes inconsistent, causing the speedometer needle to jump or drop unexpectedly during operation.
- Complete loss of speed display: A failed speedometer unit often results in a blank or zero-speed reading on the dashboard, even when the vehicle is moving at normal operating speeds.
- Transmission shift hesitation or harsh engagement: Since the transmission control unit relies on speed data for shift timing, a faulty speedometer can cause delayed or abrupt gear changes, particularly in WG180 and WG200 series units.
- Oil seepage around the sensor mounting point: Deterioration of the internal O-ring seal (often paired with 0634303485: O-RING) allows transmission fluid to leak past the speedometer housing, leaving visible residue on the 4644301333: HOUSING.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.107.005 |
| Product Type | Speedometer (Magnetic Pulse Generator) |
| Material | Hardened Steel / Aluminum Alloy Housing |
| Weight | 0.35 kg (0.77 lbs) |
| OEM Reference | ZF 4644.107.005 |
| Output Signal | Pulse (Hall Effect / Variable Reluctance) |
| Mounting Torque | 25 Nm (18.4 ft-lbs) |
| Operating Temperature | -40°C to +120°C (-40°F to +248°F) |
Compatibility
This OEM genuine speedometer is engineered for direct fitment in the ZF WG180 and WG200 transmission series. It is commonly found in medium-to-heavy-duty commercial vehicles, including construction loaders, dump trucks, and agricultural tractors. The 4644.107.005 replaces the older mechanical cable-driven units and is compatible with electronic dash clusters. For proper installation, ensure the 0730365125: TYPE PLATE is verified against your transmission model, and secure the unit using the 0631311009: GROOVED STUD provided in the assembly kit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101080 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4644301333 | HOUSING | Secondary housing for speedometer and sensor mounting |
| 0730365125 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Fastener for securing speedometer to housing |
| 0636305019 | SCREW PLUG | Sealing plug for oil passages in housing |
| 4644301247 | THREADED BUSH | Threaded insert for mounting bolts |
| 0634303485 | O-RING | Seal preventing oil leaks around speedometer |
| 4644106231 | SHIFT SYSTEM | Hydraulic shift control assembly |
| 4644306470 | GASKET | Housing interface seal for fluid containment |
| 4644306194 | COVER PLATE | Protective cover for speedometer access port |
