Overview
The ZF 4657.171.024 COUPLING is a critical driveline component engineered specifically for the WG 190 and WG 210 series transmissions. This OEM genuine part, identified by SKU 4657.171.024, serves as the mechanical link between the torque converter and the transmission input shaft, ensuring precise torque transfer and dampening torsional vibrations. Positioned within the bell housing assembly, this coupling directly influences shift quality and overall powertrain durability. When paired with a properly functioning 4657120005: PRESSURE REGULATOR, the coupling maintains consistent hydraulic pressure for smooth engagement cycles.
Symptoms of Failure
- Torque converter shudder at low speeds: A worn coupling causes noticeable vibration during takeoff or low-RPM operation, often described as a “chattering” sensation.
- Delayed or harsh gear engagement: When the coupling loses its damping capacity, operators experience a pronounced lag or clunk when shifting from neutral to drive or reverse.
- Transmission fluid contamination: Degraded coupling material sheds metallic particles into the oil, visible as glitter in fluid samples or on the dipstick.
- Intermittent loss of power transfer: Under heavy load, the coupling may slip momentarily, causing a temporary RPM flare without corresponding vehicle acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.171.024 |
| Outer Diameter | 210 mm |
| Inner Diameter (Spline) | 38 mm |
| Overall Length | 85 mm |
| Material | Hardened alloy steel with rubber damping insert |
| Weight | 2.4 kg (5.3 lbs) |
| Operating Temperature Range | -40°C to +120°C |
| Torque Capacity | 1,200 Nm peak |
Compatibility
This coupling is designed for ZF WG series transmissions, specifically the WG 191 series and its variants. It directly fits the WG 190 and WG 210 models used in medium-duty trucks, buses, and off-highway equipment. The part is also compatible with WG 180 and WG 200 transmissions when used with the correct adapter hub. For complete assembly integrity, always inspect the 0501211384: VALVE and 0630532183: INDENTED RING during installation, as these components work in tandem with the coupling to regulate fluid flow and maintain axial alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Controls main line pressure for clutch application |
| 0501211384 | VALVE | Directs hydraulic flow to shift elements |
| 0630532183 | INDENTED RING | Secures coupling hub to shaft splines |
| 4656306145 | PISTON | Applies clamping force to clutch packs |
| 0732042767 | COMPRESSION SPRING | Returns valve spools to neutral position |
| 0631612064 | SET SCREW | Locks adjustment sleeves in valve body |
| 0631610026 | SET SCREW | Secures pressure regulator spring seat |
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657301130 | HOUS.FRONT SECT | Front section enclosing torque converter |
| 4657301131 | HOUSING REAR PART | Rear section supporting output shaft |
Frequently Asked Questions
Q: Can I reuse the old indented ring when installing this coupling?
A: No. The 0630532183: INDENTED RING is a single-use component that deforms during installation. Always replace it with a new part to prevent coupling walkout.
Q: Does this coupling require special tools for installation?
A: Yes. A coupling puller and a spline alignment tool are recommended. Additionally, the 4656306145: PISTON must be compressed using a dedicated fixture to avoid damaging the rubber damping element.
Q: How often should this coupling be inspected?
A: During every major transmission overhaul (typically every 300,000 km or 5,000 operating hours). If you notice torque converter shudder, inspect the coupling immediately along with the 4657120005: PRESSURE REGULATOR for signs of wear.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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