Overview
The ZF 4681.175.002 COUPLING is a critical torque-transfer component engineered specifically for the BP 210 and BP 230 series transmissions. This OEM genuine part serves as the mechanical link between the engine output and the transmission input shaft, ensuring smooth power delivery and dampening torsional vibrations. Positioned directly within the driveline assembly, the SKU 4681.175.002 works in concert with the 4681101002: TRANSMISSION HOUSING to maintain precise alignment and load distribution. When this coupling degrades, the entire drivetrain’s operational integrity is compromised, making it a vital component for heavy-duty industrial applications.
Symptoms of Failure
- Driveline shudder during acceleration: A pronounced vibration or shudder when engaging gears indicates the coupling’s elastomeric element has hardened or cracked, reducing its dampening capacity.
- Metallic clicking from the bell housing: Worn splines or a loose fit between the coupling and the 4681201007: HOUS.FRONT SECT produce audible clicking noises during load changes.
- Oil seepage at the front seal area: A failing coupling can cause shaft misalignment, leading to premature seal wear and visible oil leaks around the 4681201008: HOUSING REAR PART interface.
- Intermittent power loss under load: Slippage within the coupling assembly results in torque not being fully transmitted, causing hesitation or power fade during heavy operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4681.175.002 |
| Outer Diameter | 175 mm (estimated) |
| Inner Diameter | 50 mm (estimated) |
| Material | High-tensile steel hub with elastomeric insert |
| Weight | 2.8 kg (estimated) |
| OEM Reference | ZF 4681.175.002 |
| Torque Capacity | Up to 1,200 Nm (estimated) |
Compatibility
This coupling is designed for ZF BP 210 and BP 230 series transmissions, commonly found in medium-duty trucks, buses, and industrial machinery. It is also compatible with WG180, WG200, and WG210 gearbox variants that share the same input shaft geometry and bell housing pattern. The part integrates directly with the 4681298001: CASE assembly, ensuring a factory-spec fitment across multiple ZF model generations.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4681101002 | TRANSMISSION HOUSING | Encloses and supports internal gear train |
| 4681201007 | HOUS.FRONT SECT | Front section housing for input shaft bearings |
| 4681201008 | HOUSING REAR PART | Rear section housing for output shaft support |
| 4681298001 | CASE | Complete outer casing assembly |
| 0631306074 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 0636100801 | CAP SCREW | Fastener for coupling-to-hub attachment |
| 4681301015 | FIXING PLATE | Secures coupling to transmission input |
| 4681301016 | SCREEN SHEET | Filter screen for oil return circuit |
| 4681301017 | SCREEN SHEET | Secondary filter screen for debris protection |
| 0636100803 | CAP SCREW | High-torque fastener for housing assembly |
Frequently Asked Questions
Q: Can the 4681.175.002 coupling be replaced without removing the transmission?
A: In most BP 210 and BP 230 installations, the coupling is accessible after removing the bell housing cover. However, full transmission removal is recommended if the HOUS.FRONT SECT requires inspection for wear.
Q: What is the typical service life of this coupling in heavy-duty applications?
A: Under normal operating conditions, the OEM coupling lasts 80,000 to 120,000 km. Harsh environments or frequent start-stop cycles can reduce this interval significantly.
Q: Are there any special tools required for installation?
A: A torque wrench capable of 80-100 Nm and a spline alignment tool are necessary. The CYLINDRICAL PIN must be precisely seated to avoid misalignment with the CASE assembly.
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