Overview
The ZF 4657.172.030 CLUTCH is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 series transmissions. This OEM genuine part sits within the planetary gear set assembly, where it engages and disengages power flow between rotating shafts. As a friction-based coupling element, the clutch modulates hydraulic pressure to lock or release gear sets, enabling smooth shifting under heavy load conditions. The SKU 4657.172.030 is manufactured to ZF’s exacting tolerances, ensuring consistent clamping force and thermal stability in demanding industrial applications. When paired with a properly functioning 4657120005: PRESSURE REGULATOR, this clutch maintains precise oil flow control, directly influencing shift quality and transmission longevity.
Symptoms of Failure
- Delayed or harsh gear engagement: When the clutch disc wears thin or glazes over, you may experience a noticeable lag between shifting and actual gear engagement, often accompanied by a jarring thud. This is a classic sign of reduced friction material thickness.
- Transmission slipping under load: A failing 4657.172.030 clutch cannot hold torque during acceleration or uphill driving, causing the engine to rev without corresponding vehicle speed increase. This symptom worsens as the clutch pack loses clamping force.
- Dark, burnt-smelling transmission fluid: Overheated clutch plates shed friction material into the oil, giving it a dark brown or black color and a distinct burnt odor. This indicates the clutch is slipping excessively and generating extreme heat.
- Oil leaks near the clutch housing: Worn piston seals or damaged clutch drum surfaces allow pressurized fluid to escape, leaving visible drips around the bell housing area. This often coincides with low fluid levels and erratic shifting.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4657.172.030 |
| OEM Reference | ZF 4657.172.030 |
| Material | Sintered bronze friction lining on steel core |
| Outer Diameter | 172 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Thickness (assembled) | 4.5 mm (estimated) |
| Weight | 0.85 kg (1.87 lbs) |
| Operating Pressure Range | 8–16 bar |
| Max Torque Capacity | 650 Nm (estimated) |
Compatibility
This clutch is designed for ZF WG series transmissions, specifically the WG 190 and WG 210 models. It also fits the WG 191 Series, where it functions as the primary forward clutch. Compatible transmission variants include the WG180, WG200, and WG211, provided they share the same clutch drum and piston geometry. For proper installation, ensure the 0501211384: VALVE and 0630532183: INDENTED RING are inspected simultaneously, as these components directly affect clutch piston travel and hydraulic sealing. Additionally, the 4656306145: PISTON must be free of scoring to prevent uneven clutch wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Controls hydraulic pressure to the clutch pack |
| 0501211384 | VALVE | Directs oil flow for clutch engagement timing |
| 0630532183 | INDENTED RING | Retains clutch pack and absorbs axial play |
| 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 tolerances |
| 4657101049 | TRANSMISSION HOUSING | Encloses the entire clutch assembly |
| 4657301130 | HOUS.FRONT SECT | Front section of the clutch drum housing |
| 4657301131 | HOUSING REAR PART | Rear section supporting the clutch output shaft |
Frequently Asked Questions
Q: Can I reuse the old piston seals when installing a new 4657.172.030 clutch?
A: No. Always replace the piston seals and the 0630532183: INDENTED RING during clutch replacement. Old seals may have hardened, causing fluid bypass and premature clutch failure.
Q: How do I know if the clutch pack needs adjustment after installation?
A: Measure the free play between the clutch plates using a feeler gauge. If clearance exceeds 0.5 mm, you may need to replace the 0732042767: COMPRESSION SPRING or adjust with the appropriate set screws.
Q: Is the 4657.172.030 clutch interchangeable with the WG 180 series?
A: Yes, it is physically compatible with WG 180, WG 190, and WG 210 transmissions, but always verify the clutch drum spline count and piston bore diameter before installation.
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