Overview
The ZF 4681.171.004 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 torque converter and the input shaft, ensuring seamless power transfer and torsional vibration dampening within the drivetrain. As a factory-original part, the SKU 4681.171.004 guarantees exact fitment and material integrity, eliminating the risks associated with aftermarket substitutes. Designed to withstand high cyclic loads and thermal stress, this coupling maintains optimal gear engagement and driveline stability under demanding industrial applications.
Symptoms of Failure
When the ZF 4681.171.004 COUPLING begins to wear, operators will notice distinct performance degradation. Common failure indicators include:
- Transmission oil leaks near the bell housing: Worn coupling seals allow hydraulic fluid to escape, often visible as drips or wet spots around the joint area.
- Gear slipping under load: A fatigued coupling loses its ability to maintain positive engagement, causing intermittent power loss during acceleration or uphill operation.
- Abnormal driveline vibration: Excessive play in the coupling generates low-frequency shuddering, particularly noticeable at specific RPM ranges (typically 1200-1800 RPM).
- Delayed or harsh shifting: Compromised torsional dampening leads to irregular clutch pack engagement, resulting in jarring gear changes or hesitation between ratios.
Technical Specifications
| Part Number (SKU) | 4681.171.004 |
| Outer Diameter | 210 mm (8.27 in) |
| Inner Diameter | 65 mm (2.56 in) |
| Overall Length | 95 mm (3.74 in) |
| Material | High-tensile alloy steel with nitrided surface |
| Weight | 2.85 kg (6.28 lbs) |
| OEM Reference | ZF 4681.171.004 (Genuine) |
| Torque Capacity | 1,450 Nm (1,069 lb-ft) |
Compatibility
This OEM coupling is designed for direct replacement in the following ZF transmission series:
- BP 210 Series (all variants including BP 210, BP 210R, BP 210E)
- BP 230 Series (all variants including BP 230, BP 230R, BP 230E)
- WG 180 Series (selected models with BP-style torque converter interface)
- WG 200 Series (selected models with BP-style torque converter interface)
- WG 210 Series (selected models with BP-style torque converter interface)
Always verify your transmission’s serial number against the ZF parts catalog before installation. This part is not compatible with HP or Ecomat series transmissions.
