ZF 4657.176.025 CLUTCH for WG 190/WG 210 | OEM Genuine Part

Overview

The ZF 4657.176.025 CLUTCH is a critical friction component engineered specifically for the WG 190 and WG 210 series transmissions. This OEM genuine part serves as the primary torque-transfer interface within the planetary gear set, engaging and disengaging power flow to specific gear ratios. Positioned directly on the clutch drum assembly, the 4657.176.025 clutch pack works in concert with hydraulic actuation systems to ensure smooth, precise shifting under heavy industrial loads. When paired with a properly functioning 4657120005: PRESSURE REGULATOR, this clutch maintains consistent clamping force, preventing premature wear and thermal degradation. The SKU 4657.176.025 is a direct replacement for original equipment, guaranteeing factory-specified clearances and material composition.

Symptoms of Failure

• Delayed or harsh gear engagement: When the 4657.176.025 clutch friction material wears thin, hydraulic pressure cannot fully lock the clutch pack, causing a noticeable lag or abrupt “clunk” when shifting from neutral to drive or reverse.
• Transmission overheating under load: A slipping clutch generates excessive heat due to constant friction. Operators may observe elevated transmission fluid temperatures, particularly during low-speed maneuvering or uphill hauling.
• Burnt transmission fluid odor: Worn clutch plates produce fine debris that contaminates the hydraulic fluid. A distinct burnt smell, often accompanied by dark, gritty fluid, indicates the 4657.176.025 clutch pack requires immediate replacement.
• Intermittent loss of forward or reverse: As the clutch pack loses its friction coefficient, the transmission may randomly fail to transmit power, especially when the fluid is cold or after extended operation.

Technical Specifications

Compatibility

This 4657.176.025 clutch is primarily designed for the ZF WG 211 Series, but it also fits the following transmission models based on shared clutch drum geometry: WG 180, WG 190, WG 200, and WG 210. It is compatible with both standard and heavy-duty variants of these series. For proper hydraulic timing, ensure the 0501211384: VALVE is inspected during installation, as worn valve bodies can cause uneven clutch application. Additionally, the 0630532183: INDENTED RING must be checked for groove wear, and the 4656306145: PISTON should be resealed to prevent fluid bypass. Always verify the clutch pack clearance using a feeler gauge; the factory specification is 0.5–0.8 mm for the 4657.176.025 assembly.

Related Components

Frequently Asked Questions

Q: Can I replace just the 4657.176.025 clutch plates without replacing the steel separator plates?
A: It is strongly recommended to replace both friction and steel plates as a set. The steel plates often develop heat spots and warpage that cannot be visually detected. Using old steel plates with new friction material will reduce clutch life by up to 40%.

Q: How do I know if the 4657.176.025 clutch is compatible with my WG 211 transmission?
A: Check the clutch drum spline count and overall stack height. The 4657.176.025 uses a 32-spline inner hub and requires a total pack thickness of 22.5 mm when compressed. If your drum has a different spline count, you may need the 4657.176.030 variant.

Q: What torque specification should I use for the piston retaining bolts when installing this clutch?
A: The piston retaining bolts (part 0631612064) must be torqued to 45 Nm ± 3 Nm using a thread-locking compound. Over-tightening can distort the piston bore and cause the 4656306145 piston to bind.