Overview
The ZF 4681.174.003 COUPLING is a critical driveline component engineered specifically for the BP 210 and BP 230 series transmissions. This OEM genuine part functions as a torsional vibration damper, connecting the engine output to the transmission input shaft while absorbing harmonic oscillations that would otherwise degrade gear mesh quality and bearing life. Manufactured to ZF’s original specifications, the 4681.174.003 coupling ensures precise torque transfer and reduces stress on adjacent planetary gear sets. This part sits directly between the flywheel housing and the torque converter assembly, making it essential for maintaining drivetrain integrity in heavy-duty applications.
Symptoms of Failure
When the ZF 4681.174.003 coupling begins to wear, operators may notice several distinct performance issues. Transmission shudder during low-speed maneuvering is a primary indicator, often described as a “chattering” sensation when moving from a standstill. Another common symptom is irregular oil contamination with metallic debris in the transmission pan, as the coupling’s rubber element degrades and sheds material into the hydraulic circuit. Operators may also experience audible clunking noises during gear engagement, particularly when shifting between forward and reverse. Finally, reduced fuel economy accompanied by elevated transmission operating temperatures can signal that the coupling is no longer effectively dampening vibrations, forcing the transmission to work harder.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4681.174.003 |
| Outer Diameter | 210 mm (approx.) |
| Inner Diameter (Spline) | 45 mm (approx.) |
| Overall Height | 85 mm |
| Material | High-tensile steel hub with HNBR rubber element |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4681.174.003 (Genuine) |
| Torque Capacity | 1,200 Nm (estimated) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF coupling is designed for use in the BP 210 Series and BP 230 Series transmissions. Based on its physical dimensions and spline configuration, the 4681.174.003 part is also compatible with the following ZF transmission models that share similar input shaft specifications:
- ZF WG180
- ZF WG200
- ZF WG210
- ZF Ecomat 4 HP 590
- ZF Ecomat 5 HP 600
Always verify spline count and pilot bore dimensions against your specific transmission housing before installation. This part is not interchangeable with the 4681.174.001 or 4681.174.002 variants without checking the hub offset.
