Overview
The ZF 4681.171.005 COUPLING is a critical OEM genuine component engineered specifically for the BP 210 and BP 230 series transmissions. This precision-machined coupling serves as the primary mechanical link between the transmission output shaft and the driveline, ensuring seamless torque transfer and rotational alignment under heavy-duty operating conditions. As a genuine ZF part, the SKU 4681.171.005 guarantees exact fitment and material integrity, eliminating the risks associated with aftermarket substitutes. Positioned directly at the transmission’s rear housing, this coupling absorbs torsional vibrations and maintains driveline stability, making it indispensable for industrial vehicles and machinery relying on BP-series gearboxes.
Symptoms of Failure
When the ZF 4681.171.005 COUPLING begins to wear, operators will notice distinct performance degradation. Below are the most common failure indicators:
- Driveline clunking or knocking sounds: Excessive play in the coupling creates audible metallic impacts during acceleration or deceleration, often mistaken for universal joint failure.
- Transmission fluid seepage at the rear seal: A worn coupling can misalign the output shaft, leading to premature seal wear and visible oil leaks around the transmission tail housing.
- Vibration under load: Degraded spline engagement causes harmonic vibrations that intensify when the vehicle is under torque, particularly at highway speeds or during hill climbs.
- Intermittent gear engagement hesitation: As the coupling loses its structural rigidity, the transmission may exhibit delayed or rough shifting due to inconsistent rotational feedback.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4681.171.005 |
| Outer Diameter | 120 mm (estimated) |
| Inner Spline Diameter | 45 mm (estimated) |
| Overall Length | 95 mm (estimated) |
| Material | Heat-treated alloy steel |
| Weight | 1.8 kg (estimated) |
| OEM Reference | ZF BP 210 / BP 230 series |
Compatibility
This genuine ZF 4681.171.005 COUPLING is designed for direct installation in the following ZF transmission models:
- ZF BP 210 Series – All variants including standard and heavy-duty configurations.
- ZF BP 230 Series – Compatible with both 4-speed and 6-speed versions.
- ZF WG180 – Fits when used in conjunction with BP-series output adapters.
- ZF WG200 – Verified for mechanical interchangeability with OEM mounting points.
- ZF 4HP22 / 4HP24 – Limited compatibility; requires confirmation of output shaft spline count.
For precise fitment verification, always cross-reference your transmission’s serial number with the ZF 4681.171.005 specifications. This coupling is not recommended for use in ZF Ecomat or AS Tronic series without adapter kits.
