Overview
The ZF 4657.175.020 CLUTCH is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 series transmissions. Positioned within the planetary gear set assembly, this OEM genuine part engages and disengages power flow between rotating shafts, enabling smooth gear shifts under heavy load conditions. The SKU 4657.175.020 is precision-machined to ZF’s original tolerances, ensuring direct interchangeability with factory-installed units. When paired with the 4657120005: PRESSURE REGULATOR, this clutch maintains consistent hydraulic clamping force, while the 0501211384: VALVE modulates fluid flow to prevent engagement delay.
Symptoms of Failure
- Delayed or harsh gear engagement – When the clutch friction material wears, you may notice a pronounced lag or jarring shift when moving from neutral to drive or reverse.
- Torque converter shudder at low RPM – A worn 4657.175.020 clutch can cause vibration during acceleration from a stop, often misdiagnosed as a converter issue.
- Transmission fluid contamination – Shedding friction particles from the clutch pack will produce dark, metallic debris in the oil pan, visible during routine service.
- Intermittent gear slip under load – The transmission may momentarily lose power delivery when climbing grades or towing, indicating the clutch can no longer hold full torque.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.175.020 |
| OEM Reference | ZF 4657.175.020 |
| Material | Sintered bronze friction lining on steel core |
| Outer Diameter | 175 mm |
| Inner Diameter | 120 mm |
| Thickness (new) | 3.2 mm |
| Weight | 0.85 kg |
| Operating Pressure | 12–18 bar |
| Temperature Range | -20°C to +120°C |
Compatibility
This clutch is a direct fit for the ZF WG 191 Series, including models WG 190 and WG 210. It is also compatible with earlier WG 180 and WG 200 transmissions when used with the correct 0630532183: INDENTED RING and 4656306145: PISTON assembly. For WG 220 and WG 230 variants, verify the spline count and stack height before installation. The 4657.175.020 clutch is not used in ZF 6HP or 8HP passenger car transmissions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Controls hydraulic pressure to the clutch pack |
| 0501211384 | VALVE | Modulates fluid flow for clutch engagement timing |
| 0630532183 | INDENTED RING | Retains clutch pack alignment within the drum |
| 4656306145 | PISTON | Applies clamping force to the clutch plates |
| 0732042767 | COMPRESSION SPRING | Returns piston to disengaged position |
| 0631612064 | SET SCREW | Secures valve body components |
| 0631610026 | SET SCREW | Adjusts clutch clearance |
| 4657101049 | TRANSMISSION HOUSING | Encloses the clutch and gear assembly |
| 4657301130 | HOUS.FRONT SECT | Front section of the transmission casing |
| 4657301131 | HOUSING REAR PART | Rear section of the transmission casing |
Frequently Asked Questions
Q: Can I replace the 4657.175.020 clutch without removing the transmission?
A: No. This clutch is located inside the main drum assembly and requires transmission removal and disassembly of the gear train for access. Always replace the 0630532183: INDENTED RING and 4656306145: PISTON seals simultaneously.
Q: How do I verify this clutch is the correct thickness for my WG 210?
A: Measure the stack height of the existing clutch pack. The 4657.175.020 has a nominal thickness of 3.2 mm. If your pack uses multiple plates, total stack height should not exceed 28.5 mm. Use a 0631610026: SET SCREW to adjust end play.
Q: What causes premature failure of this clutch?
A: The most common cause is low hydraulic pressure from a failing 4657120005: PRESSURE REGULATOR. Contaminated fluid or a stuck 0501211384: VALVE can also cause the clutch to slip and overheat.
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Phone: +86 158 2286 3467 |
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