ZF 4681.174.002 COUPLING for BP 210/BP 230 | OEM Genuine Part

Overview

The ZF 4681.174.002 COUPLING is a critical driveline component engineered specifically for the BP 210 and BP 230 series transmissions. This OEM genuine part serves as the primary mechanical link between the transmission output shaft and the downstream drive assembly, ensuring precise torque transfer and rotational alignment. Located within the rear housing section, this coupling absorbs torsional vibrations and maintains concentricity under heavy load conditions. The SKU 4681.174.002 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit without modification. When paired with the 4681101002: TRANSMISSION HOUSING, it forms the backbone of the power transfer system in industrial machinery.

Symptoms of Failure

• Oil seepage at the coupling housing interface: Worn seals on the 4681.174.002 coupling allow transmission fluid to escape, leaving visible drips under the vehicle or machine. This is a common long-tail search query for “ZF BP 210 oil leak coupling.”
• Intermittent gear slipping under load: As the coupling splines wear, torque transmission becomes inconsistent, causing the transmission to momentarily lose drive power during acceleration or hill climbing.
• Metallic grinding noise from the rear housing: A failing coupling produces a distinct chatter or grinding sound, particularly when shifting between forward and reverse gears. This symptom often leads operators to search “ZF BP 230 grinding noise rear housing.”
• Excessive driveline vibration at cruising speed: Degraded elastomeric elements in the coupling fail to dampen harmonics, resulting in a noticeable shudder through the chassis at highway speeds.

Technical Specifications

Compatibility

This coupling is designed for the ZF BP 210 and BP 230 series transmissions, commonly found in medium-duty trucks, buses, and construction equipment. It is also compatible with the WG180 and WG200 series models that share the same output shaft architecture. The 4681.174.002 interfaces directly with the 4681201007: HOUS.FRONT SECT and the 4681201008: HOUSING REAR PART to form a sealed assembly. For complete rebuilds, the 4681298001: CASE is often replaced concurrently to ensure housing integrity.

Related Components

Frequently Asked Questions

Q: How do I know if the 4681.174.002 coupling needs replacement?
A: Inspect for visible spline wear, oil leaks at the rear housing joint, or a clunking noise when engaging the drivetrain. If the coupling shows more than 0.5 mm of play on the output shaft, replacement is required.

Q: Can this coupling be used in a ZF WG200 transmission?
A: Yes, the 4681.174.002 is compatible with WG200 models that share the same output shaft spline pattern as the BP 210/230 series. Always verify the spline count matches your unit.

Q: What torque specification should I use when installing this coupling?
A: Tighten the retaining cap screws (part 0636100801) to 85 Nm using a calibrated torque wrench. Apply thread locker to prevent loosening under vibration.