Overview
The ZF 4657.173.015 COUPLING is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 series transmissions. Positioned between the turbine shaft and the gearset, this OEM genuine coupling ensures precise rotational alignment and dampens torsional vibrations during load shifts. The SKU 4657.173.015 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in the WG 191 Series category. Without this coupling, the transmission cannot maintain consistent power flow, leading to driveline instability and premature wear on adjacent assemblies.
Symptoms of Failure
When the ZF 4657.173.015 coupling begins to fail, operators often notice intermittent gear engagement hesitation during acceleration, a symptom frequently searched as “ZF WG190 coupling slipping.” Another common failure sign is low-frequency driveline shudder at highway speeds, which indicates the coupling’s elastomeric core has degraded. You may also detect metallic debris in the transmission fluid during routine oil changes, a clear indicator that the coupling’s splines are wearing against the mating shaft. Finally, unusual clunking noises when shifting between forward and reverse gears suggest the coupling has lost its dampening capacity.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4657.173.015 |
| Outer Diameter | 195 mm |
| Inner Spline Diameter | 42 mm |
| Overall Length | 85 mm |
| Material | Heat-treated alloy steel with elastomeric dampener |
| Weight | 2.8 kg |
| Operating Torque Range | 1,200 – 1,800 Nm |
| OEM Reference | ZF WG 191 Series |
Compatibility
This coupling is designed for ZF WG 190 and WG 210 transmissions, including the WG 191 Series variants. It also fits select WG 180 and WG 200 models where the spline count and dampener stiffness match the original factory configuration. Always verify your transmission’s serial number against the 4657.173.015 specifications before installation. For transmissions requiring additional hydraulic control, pair this coupling with the 4657120005: PRESSURE REGULATOR to maintain consistent clutch apply pressure. The 0501211384: VALVE and 0630532183: INDENTED RING are also commonly replaced during the same service interval to prevent oil bypass. Additionally, the 4656306145: PISTON should be inspected for scoring when the coupling is removed.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Maintains hydraulic pressure for clutch engagement |
| 0501211384 | VALVE | Directs oil flow to shift actuators |
| 0630532183 | INDENTED RING | Secures coupling axial position on shaft |
| 4656306145 | PISTON | Applies force to clutch packs |
| 0732042767 | COMPRESSION SPRING | Returns piston to neutral position |
| 0631612064 | SET SCREW | Locks valve body adjustments |
| 0631610026 | SET SCREW | Secures housing alignment dowels |
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gearset |
| 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 the 4657.173.015 coupling?
A: No. The 0630532183: INDENTED RING should always be replaced with the coupling, as the ring’s locking tabs deform permanently during removal.
Q: Does this coupling fit the ZF WG 200 transmission?
A: Yes, the 4657.173.015 is compatible with WG 200 models that use the 42 mm spline shaft. Verify your transmission’s part number against the OEM reference before ordering.
Q: What torque specification should I use for the set screws?
A: Use 45 Nm for the 0631612064: SET SCREW and 38 Nm for the 0631610026: SET SCREW to prevent housing distortion.
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Phone: +86 158 2286 3467 |
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