Overview
The ZF 4657.173.034 COUPLING is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 series transmissions. This OEM genuine part sits between the transmission housing and the front section assembly, acting as a precision-machined interface that absorbs torsional vibrations and ensures smooth power delivery from the engine to the gearbox. The SKU 4657.173.034 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit without modification. When paired with a properly sealed TRANSMISSION HOUSING, this coupling maintains the structural integrity of the drivetrain under heavy industrial loads.
Symptoms of Failure
- Transmission oil leaks at the bell housing joint – Worn coupling seals allow hydraulic fluid to escape, often visible as drips near the WG 210 mounting flange.
- Gear slipping under load – A degraded coupling loses its clamping force, causing intermittent power loss during acceleration or hill climbs.
- Abnormal vibration during gear shifts – Excessive play in the coupling produces a low-frequency shudder, particularly noticeable when shifting between 2nd and 3rd gear.
- Metallic rattling from the transmission bell area – Loose coupling components create a distinct chatter at idle, worsening as the part wears further.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.173.034 |
| Outer Diameter | 210 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Thickness | 35 mm (estimated) |
| Material | High-grade alloy steel with nitrided surface |
| Weight | 2.8 kg (estimated) |
| OEM Reference | ZF 4657.173.034 |
| Torque Capacity | Up to 1,200 Nm (estimated) |
Compatibility
This coupling is designed for ZF WG 190 and WG 210 series transmissions, commonly found in medium-duty trucks, construction loaders, and agricultural tractors. It also fits select WG 180 and WG 200 models produced after 2005. The part interfaces directly with the HOUS.FRONT SECT and the HOUSING REAR PART, forming a sealed assembly that prevents contamination. For WG 230 variants, verify the spline count matches your unit; the 4657.173.034 uses a 14-tooth internal spline. Always inspect the HOUSING REAR SECTION for cracks when replacing this coupling, as misalignment accelerates wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4657201170 | HOUSING REAR PART | Rear section housing for output shaft alignment |
| 4657298102 | HOUSING REAR SECTION | Complete rear housing assembly with bearing seats |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing-to-coupling positioning |
| 0636100801 | CAP SCREW | M12 fastening bolt for coupling retention |
| 4656301148 | FIXING PLATE | Locking plate to prevent screw loosening |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for suction line |
| 0636100803 | CAP SCREW | M10 fastening bolt for accessory mounting |
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