Overview
The ZF 4644.152.540 COUPLING is a critical driveline component engineered specifically for the WG 180 and WG 200 transmission series. This OEM genuine part serves as the primary mechanical link between the engine output and the transmission input shaft, ensuring precise torque transfer and dampening torsional vibrations. Located within the bell housing assembly, the coupling interfaces directly with the TRANSMISSION HOUSING (4644101172) to maintain concentric alignment. The SKU 4644.152.540 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty industrial applications.
Symptoms of Failure
When the ZF 4644.152.540 coupling begins to degrade, operators typically notice these specific failure indicators:
- Transmission gear slipping under load — A worn coupling loses its ability to maintain positive engagement, causing intermittent power loss during acceleration or uphill operation.
- Metallic rattling or clunking from the bell housing — Excessive clearance in the coupling splines produces audible noise, particularly when shifting between forward and reverse.
- Oil contamination near the transmission input seal — A failing coupling can cause misalignment, leading to premature wear of the SCREW PLUG (0636302005) and adjacent sealing surfaces, resulting in fluid leaks.
- Vibration through the chassis at specific RPM ranges — Deteriorated rubber or elastomeric elements within the coupling fail to dampen harmonics, transmitting harshness to the driveline.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (OEM) | 4644.152.540 |
| Outer Diameter | 152 mm |
| Inner Bore Diameter | 54 mm (spline-fit) |
| Overall Length | 85 mm |
| Material | High-tensile steel with nitrile rubber dampener |
| Weight | 1.85 kg |
| OEM Reference | ZF 4644.152.540 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This coupling is designed for the ZF WG 180 and ZF WG 200 transmission families, which are widely used in municipal trucks, construction loaders, and industrial material handlers. It also fits the WG 201 Series (current category) and select variants of the WG 160 range. The part is not interchangeable with earlier WG 100-series models without adapter modifications. For proper installation, ensure the TRANSMISSION HOUSING (4644301390) is inspected for wear, and the THREADED BUSH (4644301189) is replaced if damaged.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101172 | TRANSMISSION HOUSING | Encloses and supports the coupling assembly |
| 4644301390 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 series |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for coupling retention |
| 0636302005 | SCREW PLUG | Seals the housing access port |
| 0634306198 | O-RING | Prevents fluid leakage at housing joints |
| 0634801098 | SEALING RING | Creates a static seal between mating surfaces |
| 0730365067 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for housing positioning |
| 4644301161 | COVER PLATE | Protects the coupling from debris ingress |
| 0636100621 | HEXAGON SCREW | Fastener for securing the cover plate |
