Overview
This OEM genuine ZF 4681.171.002 COUPLING is a critical driveline component engineered specifically for the BP 210 and BP 230 series transmissions. Positioned between the torque converter and the main gearset, this coupling transfers rotational force while dampening torsional vibrations to protect downstream planetary gears. The SKU 4681.171.002 is manufactured to ZF’s exacting tolerances, ensuring a precise fit within the transmission housing assembly. When paired with a properly sealed 4681101002: TRANSMISSION HOUSING, this part maintains optimal hydraulic pressure and alignment for heavy-duty industrial applications.
Symptoms of Failure
- Oil leaks near the bell housing: A worn 4681.171.002 coupling can cause seal degradation, leading to visible fluid drips under the transmission. This is a common long-tail search query for “ZF BP 210 oil leak coupling.”
- Gear slipping under load: When the coupling loses its dampening capacity, torque spikes cause intermittent clutch pack slippage, especially during low-speed maneuvering or uphill operation.
- Abnormal vibration at 1200-1800 RPM: A fatigued coupling transmits excessive harmonics through the drivetrain, producing a distinct shudder that intensifies with engine load.
- Metallic debris in transmission fluid: As the coupling wears, small particles contaminate the oil, often accompanied by a burnt smell from overheating friction surfaces.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4681.171.002 |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter | 85 mm (estimated) |
| Thickness | 45 mm (estimated) |
| Material | High-strength alloy steel with nitrided surface |
| Weight | 2.8 kg (estimated) |
| OEM Reference | ZF 4681.171.002 |
| Torque Capacity | 1200 Nm (estimated) |
Compatibility
This coupling is designed for ZF BP 210 and BP 230 series transmissions, which are commonly found in medium-duty trucks, buses, and off-highway equipment. It also fits select WG180 and WG200 models that share the same bell housing pattern. For proper installation, ensure the 4681201007: HOUS.FRONT SECT and 4681201008: HOUSING REAR PART are free of cracks or warping. The coupling also interfaces directly with the 4681298001: CASE to maintain concentric alignment during high-speed rotation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4681101002 | TRANSMISSION HOUSING | Encloses and supports all internal components |
| 4681201007 | HOUS.FRONT SECT | Front section housing for input shaft and bearings |
| 4681201008 | HOUSING REAR PART | Rear section housing for output shaft and seals |
| 4681298001 | CASE | Main structural casing for gear train alignment |
| 0631306074 | CYLINDRICAL PIN | Locates and aligns housing sections during assembly |
| 0636100801 | CAP SCREW | Secures coupling to the input shaft flange |
| 4681301015 | FIXING PLATE | Locks coupling in position to prevent axial movement |
| 4681301016 | SCREEN SHEET | Filters debris from oil flow near the coupling |
| 4681301017 | SCREEN SHEET | Secondary filtration for high-pressure oil circuits |
| 0636100803 | CAP SCREW | Fastens the fixing plate to the housing |
Frequently Asked Questions
Q: How do I know if the 4681.171.002 coupling is failing?
A: Look for oil leaks at the bell housing, a shudder between 1200-1800 RPM, or metallic particles in the transmission fluid. These symptoms indicate the coupling has lost its dampening properties and requires immediate replacement.
Q: Can this coupling be reused after a transmission rebuild?
A: No. ZF recommends always installing a new OEM 4681.171.002 coupling during any major overhaul. The nitrided surface wears microscopically, and reuse can lead to premature failure of the HOUS.FRONT SECT due to misalignment.
Q: Does this part fit both BP 210 and BP 230 models?
A: Yes. The 4681.171.002 is a shared component across both series. However, always verify the CASE part number matches your transmission tag to confirm compatibility with your specific build.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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