Overview
The ZF 4657.176.021 CLUTCH is a critical friction component engineered for the WG 190 and WG 210 series powershift transmissions. Positioned within the planetary gearset assembly, this OEM genuine part is responsible for engaging and disengaging specific gear ratios by transferring torque through hydraulic pressure. The SKU 4657.176.021 directly replaces the original factory clutch pack, ensuring precise shift timing and load-holding capability. When paired with a robust TRANSMISSION HOUSING, this clutch maintains the structural integrity required for heavy-duty industrial applications.
Symptoms of Failure
- Delayed or erratic gear engagement: Worn friction material causes hesitation when shifting from neutral to drive, often accompanied by a noticeable lag under load.
- Transmission overheating: Slipping clutches generate excessive heat, leading to burnt transmission fluid odor and elevated temperature warnings on the dashboard.
- Torque loss during uphill operation: The clutch fails to hold full engine torque, resulting in RPM flare without corresponding vehicle speed increase on inclines.
- Metallic grinding noises: Advanced wear exposes steel backing plates, producing a distinct grinding sound during gear changes in the WG 191 and WG 211 series.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.176.021 |
| Outer Diameter | 176 mm |
| Inner Diameter | 121 mm |
| Friction Plate Thickness | 2.5 mm (each plate) |
| Number of Friction Plates | 5 |
| Material | Sintered bronze on steel core |
| Weight | 1.8 kg (complete pack) |
| OEM Reference | ZF 4657.176.021 |
| Operating Pressure | 12–18 bar |
Compatibility
This clutch pack is designed for ZF WG 190 and WG 210 series transmissions, specifically fitting the WG 191 and WG 211 sub-variants. It is also compatible with WG 180 and WG 200 models that utilize the same 176 mm clutch drum diameter. The assembly integrates directly with the HOUS.FRONT SECT and the HOUSING REAR PART to form the complete clutch drum enclosure. Secure alignment is ensured by the CYLINDRICAL PIN, which prevents rotational misalignment during high-torque shifts.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Encloses and supports the entire gearset and clutch assembly |
| 4657301130 | HOUS.FRONT SECT | Front section of the clutch drum housing |
| 4657301131 | HOUSING REAR PART | Rear section of the clutch drum housing |
| 0631306816 | CYLINDRICAL PIN | Aligns housing sections and prevents rotation |
| 0636102489 | CAP SCREW | Secures housing sections together |
| 4656301148 | FIXING PLATE | Locks clutch pack in position within the drum |
| 0636102463 | CAP SCREW | Fastens fixing plate to the housing |
| 4657201133 | SCREEN SHEET | Filters debris from hydraulic fluid entering the clutch |
| 0636115287 | CAP SCREW | Mounts screen sheet to the valve body |
| 4657301065 | PLATE | Separates clutch packs within multi-speed transmissions |
Frequently Asked Questions
Q: Can the ZF 4657.176.021 clutch be used in a WG 180 transmission?
A: Yes, this clutch pack is compatible with WG 180 models that share the same 176 mm clutch drum diameter. Always verify the drum inner spline count matches your specific unit before installation.
Q: How do I know if my clutch pack is worn beyond service limits?
A: Measure the total stack height of all friction and steel plates. If the stack height is below 14.5 mm (new height is 15.0 mm), or if any friction plate shows glazing or uneven wear, replacement with the 4657.176.021 is recommended.
Q: What torque specification should I use for the cap screws when reassembling?
A: For the CAP SCREW fasteners, apply 45 Nm ± 3 Nm using a calibrated torque wrench. Overtightening can distort the housing sections and cause premature clutch failure.
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Phone: +86 158 2286 3467 |
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