Overview
This genuine OEM ZF coupling, part number 4657.173.029, serves as the critical torsional vibration damper and torque transfer interface within the WG 190, WG 210, and WG 230 series transmissions. It is positioned between the engine flywheel and the transmission input shaft, absorbing rotational irregularities to protect the gear train from shock loads. The coupling ensures smooth power delivery and reduces driveline noise. When paired with a robust TRANSMISSION HOUSING, this component maintains precise alignment and structural integrity under high-torque conditions.
Symptoms of Failure
- Torque fluctuation under load: Worn elastomeric elements cause surging or jerking during acceleration, often misdiagnosed as gear slipping.
- Metallic rattling at idle: Degraded damping material leads to audible chatter from the bell housing area, especially in neutral.
- Oil seepage near the bell housing: Cracks in the coupling hub can allow transmission fluid to migrate past the seal, leaving drips on the floor.
- Vibration through the chassis: Unbalanced rotation from a failing coupling transmits harshness into the cab or frame at highway speeds.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4657.173.029 |
| Outer Diameter | 280 mm (estimated) |
| Overall Length | 95 mm (estimated) |
| Material | High-tensile steel hub with elastomeric damping insert |
| Weight | 4.2 kg (estimated) |
| OEM Reference | ZF 4657.173.029 |
| Torque Capacity | Up to 1,200 Nm (estimated) |
Compatibility
This coupling is engineered for ZF WG series powershift transmissions, specifically the WG 180, WG 190, WG 200, WG 210, and WG 230 models. It is a direct replacement for the original factory-installed damper in these heavy-duty off-highway and industrial drivetrains. For a complete rebuild, ensure the HOUS.FRONT SECT and HOUSING REAR PART are inspected for wear, as misalignment here accelerates coupling failure. The HOUSING REAR SECTION also shares the same mounting interface on later production units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Encloses and supports the gear train and coupling assembly |
| 4657201166 | HOUS.FRONT SECT | Front section of the main housing, aligns input shaft |
| 4657201170 | HOUSING REAR PART | Rear housing segment, supports output shaft bearings |
| 4657298102 | HOUSING REAR SECTION | Alternate rear housing variant for specific WG models |
| 0631306816 | CYLINDRICAL PIN | Precision alignment pin for housing doweling |
| 0636100801 | CAP SCREW | M10 fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Locks coupling hub to the input shaft spline |
| 4657301032 | SCREEN SHEET | Fine mesh filter for transmission oil circuit |
| 4657301033 | SCREEN SHEET | Alternate micron rating filter screen |
| 0636100803 | CAP SCREW | M12 cap screw for heavy-duty housing joints |
Frequently Asked Questions
Q: Can I reuse the old coupling bolts when installing part 4657.173.029?
A: No. ZF specifies that all fasteners, including the CAP SCREW (0636100801), must be replaced to ensure proper clamping force and prevent loosening from vibration.
Q: How do I know if my WG 210 needs a new coupling versus a housing issue?
A: If you feel driveline shudder but see no oil leaks, the coupling is likely failing. If you find fluid pooling near the bell housing, inspect the HOUS.FRONT SECT for cracks or seal damage first.
Q: Is this coupling compatible with the WG 230 series with a rear PTO?
A: Yes, the 4657.173.029 fits all WG 230 variants. However, verify that the HOUSING REAR SECTION on your unit matches the PTO configuration before assembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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