ZF 4657.173.044 CLUTCH for WG 190/WG 210 | OEM Genuine Part

Overview

The ZF 4657.173.044 CLUTCH is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 transmission series. This OEM genuine part sits within the planetary gear set assembly, where it engages and disengages power flow between the input shaft and the intermediate shaft. As a friction-disc clutch pack, it modulates hydraulic pressure to enable smooth gear shifts under heavy load conditions. The SKU 4657.173.044 is manufactured to ZF’s original tolerances, ensuring precise fitment within the TRANSMISSION HOUSING and adjacent HOUS.FRONT SECT. Without this clutch, the transmission cannot achieve forward or reverse gear engagement, making it a non-negotiable element for driveline integrity.

Symptoms of Failure

• Delayed or harsh gear engagement: When the 4657.173.044 clutch pack wears, hydraulic pressure bleeds past the seals, causing a noticeable lag when shifting from neutral to drive or reverse. This often manifests as a “clunk” or jarring sensation.
• Transmission slipping under load: A worn clutch disc set loses friction coefficient, resulting in RPM flare without corresponding vehicle acceleration. This is especially evident during uphill climbs or when towing heavy loads.
• Burnt transmission fluid odor: Excessive heat from clutch slippage degrades the ATF, producing a distinct acrid smell. Dark, gritty fluid on the dipstick confirms internal clutch material contamination.
• Intermittent loss of drive in specific gears: If the clutch piston seal fails, hydraulic pressure cannot hold the pack closed, leading to sudden loss of power in the affected gear range. This symptom often worsens as transmission temperature rises.

Technical Specifications

Compatibility

This ZF 4657.173.044 clutch is designed for the WG 191 Series, but its application extends to multiple ZF industrial transmissions. Verified compatible models include: WG 180, WG 190, WG 200, WG 210, and WG 211. It also fits select variants of the Ecomat 4HP and 5HP series where the clutch pack diameter matches 173 mm. Always cross-reference the HOUSING REAR PART and CYLINDRICAL PIN alignment bores to confirm fitment for your specific transmission serial number.

Related Components

Frequently Asked Questions

Q: Can the ZF 4657.173.044 clutch be rebuilt with new friction discs?
A: Yes, this clutch pack is serviceable. However, due to the precision spline wear and seal degradation common in high-mileage units, ZF recommends replacing the entire 4657.173.044 assembly rather than individual discs to ensure consistent clamping force and hydraulic sealing.

Q: What torque specification should I use when installing this clutch?
A: The retaining bolts for the clutch pack (typically 0636102489 CAP SCREW) require 45 Nm (33 ft-lbs) with thread locker applied. Always consult the ZF service manual for your specific WG model, as housing variants like the HOUS.FRONT SECT may have different bolt lengths.

Q: Will this part fit a ZF WG 180 transmission built before 2005?
A: The 4657.173.044 clutch is backward-compatible with WG 180 units that use the 173 mm clutch drum. However, pre-2005 models may require replacing the CYLINDRICAL PIN and PLATE due to different alignment tolerances. Verify your housing casting number before ordering.