Overview
The ZF 4657.173.052 COUPLING is a precision-engineered component designed for the WG 190 and WG 210 transmission series. This OEM genuine part serves as the critical torque transfer interface within the hydraulic circuit, connecting the pump impeller to the turbine shaft. Positioned directly in the driveline, the 4657.173.052 ensures smooth power delivery and dampens torsional vibrations during gear shifts. As a factory-spec replacement, this coupling restores original performance levels and prevents premature wear on adjacent assemblies.
Symptoms of Failure
- Transmission shudder during acceleration: A worn 4657.173.052 coupling causes intermittent grabbing or slipping, especially under load, leading to a noticeable vibration in the driveline.
- Delayed engagement from Neutral to Drive: When the coupling loses its hydraulic seal, operators experience a 2-3 second lag before the transmission engages, often accompanied by a low hum.
- Fluid contamination with metallic particles: Degraded coupling surfaces shed fine metal shavings into the oil, which can be detected during routine filter inspections or oil changes.
- Erratic shift quality under moderate torque: The coupling’s inability to maintain consistent pressure results in harsh or unpredictable upshifts, particularly in the 2-3 gear range.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.173.052 |
| Material | High-strength alloy steel with nitrided surface |
| Outer Diameter | 210 mm (8.27 in) |
| Inner Diameter | 85 mm (3.35 in) |
| Weight | 2.8 kg (6.17 lbs) |
| Torque Capacity | 1,450 Nm (1,069 lb-ft) |
| Operating Temperature Range | -40°C to +120°C |
| Sealing Type | Integrated O-ring groove |
Compatibility
This coupling is engineered for the ZF WG 210 series and its predecessor, the WG 190. It is directly compatible with WG 180, WG 200, and WG 210 transmissions used in off-highway vehicles, agricultural tractors, and industrial material handlers. The 4657.173.052 also fits select WG 211 variants where the hydraulic coupling housing shares the same bolt pattern. Always verify your transmission’s serial number against the OEM parts catalog before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Secures the coupling to the turbine shaft flange |
| 0634313603 | O-RING | Provides hydraulic seal between coupling and housing |
| 0631306816 | CYLINDRICAL PIN | Aligns coupling during assembly to prevent rotational misalignment |
| 0636100801 | CAP SCREW | Fastens the coupling cover plate with precise torque retention |
| 4681301015 | FIXING PLATE | Locks the coupling in position against axial movement |
| 4681301016 | SCREEN SHEET | Filters debris from oil entering the coupling chamber |
| 4681301017 | SCREEN SHEET | Secondary filtration for high-flow oil passages |
| 0636100803 | CAP SCREW | Mounts the coupling to the pump drive hub |
| 0750100162 | OIL FEED.HOUSG. | Directs pressurized oil into the coupling for lock-up |
| 4656301023 | GASKET | Seals the coupling-to-housing interface against external leaks |
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