Overview
The ZF 4656.173.071 COUPLING is a critical torque-transfer component engineered for the WG 130 and WG 160 transmission series. This OEM genuine part sits directly between the engine flywheel and the transmission input shaft, acting as a flexible mechanical link that absorbs torsional vibrations and ensures smooth power delivery. The SKU 4656.173.071 is precision-machined to ZF’s exacting tolerances, making it an essential element in the drivetrain assembly. When installed alongside the 4656101072: TRANSMISSION HOUSING, this coupling maintains proper alignment and reduces stress on adjacent components.
Symptoms of Failure
- Abnormal driveline vibration during acceleration: A worn 4656.173.071 coupling loses its damping capacity, causing noticeable shuddering or shaking when the vehicle is under load.
- Metallic clicking or clunking from the bell housing: As the coupling’s elastomeric element degrades, loose metal components produce audible knocking sounds, especially during gear changes.
- Oil seepage around the transmission input area: A failing coupling can distort the seal surface, leading to fluid migration. This often requires replacing the 0634313514: O-RING during service.
- Intermittent loss of torque transmission: In severe cases, the coupling may partially separate, causing momentary power loss or “slipping” sensations during highway cruising.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.173.071 |
| Outer Diameter | 210 mm (estimated) |
| Inner Diameter | 45 mm (estimated) |
| Thickness | 38 mm (estimated) |
| Material | High-tensile steel with elastomeric damping insert |
| Weight | 2.8 kg (estimated) |
| Torque Capacity | 1,200 Nm (estimated) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This coupling is primarily designed for ZF WG 130 and WG 160 series transmissions. It also fits select WG 171, WG 180, and WG 200 variants where the input shaft configuration matches. The part is commonly used in municipal buses, fire trucks, and heavy construction equipment. For proper installation, ensure the 4656301168: HOUS.FRONT SECT is free of debris and the 4656201015: SCREEN SHEET is correctly positioned to prevent contamination. Always verify fitment with your specific transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101072 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4656301168 | HOUS.FRONT SECT | Front section housing the input shaft |
| 4656201015 | SCREEN SHEET | Debris filter protecting internal oil flow |
| 4656301037 | TUBE | Oil delivery conduit for lubrication |
| 0634313514 | O-RING | Seal preventing fluid leaks at joints |
| 0636100803 | CAP SCREW | Fastener for housing attachment |
| 4656301169 | HOUSING REAR PART | Rear section enclosing output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise assembly |
| 0636100801 | CAP SCREW | Bolt for securing the coupling hub |
| 0636100160 | CAP SCREW | Fastener for oil pan attachment |
Frequently Asked Questions
Q: Can the 4656.173.071 coupling be reused after removal?
A: No. This is a wear-and-tear component that should always be replaced with a new OEM part during any transmission overhaul. Reuse risks sudden failure and damage to the 4656301037: TUBE assembly.
Q: What torque specification is required for the coupling bolts?
A: ZF recommends 85 Nm for the cap screws securing this coupling. Always use new 0636100801: CAP SCREW fasteners to ensure proper clamping force.
Q: How often should this coupling be inspected?
A: For heavy-duty applications, inspect the coupling every 100,000 km or 2,000 operating hours. Replace immediately if any cracks or rubber deterioration are visible on the damping element.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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