Overview
The ZF 4646.152.438 COUPLING is a critical OEM genuine component engineered for the WG 250, WG 260, and WG 310 transmission series. This precision-machined coupling serves as the primary torque transfer interface between the engine output shaft and the transmission input assembly, ensuring smooth power delivery and driveline alignment. Identified by SKU 4646.152.438, this part is housed within the main transmission casing and works in concert with the TRANSMISSION HOUSING to maintain concentricity under heavy loads. Its robust construction minimizes vibration and compensates for minor misalignment, making it indispensable for maintaining operational efficiency in industrial and commercial vehicle applications.
Symptoms of Failure
- Torque transmission loss or gear slipping – When the coupling splines or elastomeric elements degrade, you may notice intermittent power loss during acceleration or under load, often misdiagnosed as clutch wear.
- Abnormal driveline vibration – Worn coupling components cause unbalanced rotation, leading to noticeable shuddering or humming at specific RPM ranges, especially in WG 250 series transmissions.
- Oil seepage near the bell housing – A failing coupling can compromise the seal interface, resulting in transmission fluid leaks around the HOUSING joint, often mistaken for a gasket failure.
- Metallic debris in transmission fluid – Advanced wear generates fine metal particles from the coupling hub, detectable during routine oil changes and indicating imminent component failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.152.438 |
| Material | High-tensile alloy steel with nitrided surface |
| Outer Diameter | 152 mm |
| Inner Bore Diameter | 38 mm |
| Overall Length | 85 mm |
| Weight | 1.45 kg |
| OEM Reference | ZF 4646.152.438 (Genuine) |
| Torque Capacity | 1,200 Nm (estimated) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This coupling is specifically designed for ZF WG series transmissions, including the WG 180, WG 200, WG 250, WG 260, and WG 310 models. It is a direct replacement for the original equipment coupling found in these gearboxes. When installing, ensure the COVER is properly aligned and secured using the correct HEXAGON SCREW fasteners to prevent preload issues. Always verify your transmission serial number against ZF application charts for exact fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101040 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4646301090 | HOUSING | Secondary casing for auxiliary gear sets |
| 4646301240 | COVER | Seals the coupling access port and retains lubrication |
| 0636015304 | HEXAGON SCREW | Fastens cover and housing with precise torque |
| 0636101828 | CAP SCREW | Secures coupling hub to shaft |
| 4646301102 | COVER SHEET | Thin protective plate over housing openings |
| 4646301098 | COVER SHEET | Alternate protective sheet for variant housings |
| 0730365067 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for precise assembly |
| 0636101193 | CAP SCREW | Fastener for coupling retention |
