Overview
The ZF 4646.152.020 COUPLING is a critical torque-transfer component engineered specifically for the WG 251 Series and compatible heavy-duty WG 250, WG 260, and WG 310 transmission assemblies. This OEM genuine part serves as the mechanical link between the transmission output shaft and the driveline, ensuring smooth power delivery and vibration dampening under extreme load conditions. The SKU 4646.152.020 is precision-machined to ZF’s exacting tolerances, making it a direct replacement for worn or damaged couplings in industrial and commercial vehicle applications. When installed alongside the 4646101072 TRANSMISSION HOUSING, this coupling maintains proper alignment and reduces stress on adjacent drivetrain components.
Symptoms of Failure
- Excessive driveline vibration at highway speeds – A worn 4646.152.020 coupling often produces noticeable shaking or shuddering, particularly during acceleration or deceleration, indicating degraded torsional dampening.
- Intermittent gear engagement hesitation – When the coupling loses its structural integrity, operators may experience delayed or rough shifting, as torque transmission becomes inconsistent between the transmission and output shaft.
- Metallic clunking or knocking noises – Audible sounds from the transmission bell housing area, especially when changing direction or under load, frequently point to a failing coupling that has developed excessive play.
- Visible oil seepage near the output flange – A compromised coupling can allow transmission fluid to migrate past seals, leaving wet spots on the housing or under the vehicle, often mistaken for a simple seal failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.152.020 |
| Outer Diameter | 152 mm |
| Inner Bore Diameter | 20 mm |
| Overall Length | 85 mm |
| Material | High-tensile alloy steel with nitrided surface |
| Weight | 1.45 kg |
| OEM Reference | ZF 4646.152.020 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This coupling is primarily designed for the ZF WG 251 Series transmissions, but it also fits the WG 180, WG 200, WG 250, WG 260, and WG 310 models when used with the correct 4646301201 HOUSING and 4646301166 COVER. It is commonly found in municipal trucks, construction equipment, and agricultural machinery where ZF powershift transmissions are deployed. For proper installation, ensure the mating 0636101051 CAP SCREW is torqued to factory specifications to prevent premature wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Encloses and supports internal gear sets |
| 4646301201 | HOUSING | Provides mounting surface for coupling assembly |
| 4646301166 | COVER | Seals and protects internal coupling components |
| 0636101051 | CAP SCREW | Secures coupling to output flange |
| 4646201018 | COVER SHEET | Thin protective layer for housing interface |
| 4646301277 | SCREEN SHEET | Filters debris from transmission fluid |
| 4646201019 | COVER SHEET | Secondary sealing gasket for cover assembly |
| 0730365125 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for precise coupling positioning |
| 0636010216 | HEXAGON SCREW | Fastener for housing attachment |
