ZF 4657.183.398 LOOSE PARTS for WG190 | OEM Genuine Part

Overview

The ZF 4657.183.398 LOOSE PARTS kit is a critical service assembly designed specifically for the WG 190 series transmission. This genuine OEM part consolidates multiple small components—including seals, retainers, and positioning elements—that are essential for maintaining the structural integrity of the transmission’s rear housing section. When installed, this kit ensures that the TRANSMISSION HOUSING and its adjoining sections remain securely fastened, preventing internal fluid migration and component misalignment. The SKU 4657.183.398 is a direct replacement for the original loose parts bundle, guaranteeing a precise fit without the need for modifications.

Symptoms of Failure

When the ZF 4657.183.398 LOOSE PARTS begin to degrade, operators typically encounter three distinct failure modes. First, external oil seepage around the rear housing joint is common, as the included seals lose their elasticity and allow transmission fluid to escape. Second, you may notice intermittent gear engagement hesitation during low-speed maneuvers, caused by loosened retainers that allow the HOUS.FRONT SECT to shift slightly under load. Third, a persistent metallic rattling noise from the bell housing area often indicates that the fixing plates within this kit have fatigued, permitting unwanted axial play. Finally, erratic shift timing in the WG190 can occur when the loose parts fail to properly secure the valve body interface, leading to pressure loss.

Technical Specifications

Compatibility

This loose parts kit is engineered primarily for the ZF WG 190 series, but it also cross-fits several other ZF transmissions that share the same rear housing architecture. Compatible models include the WG 180, WG 200, and the WG 210 series, provided they utilize the same HOUSING REAR PART interface. For applications using the HOUSING REAR SECTION, this kit is also fully compatible. Always verify your transmission’s serial number against the ZF parts catalog to ensure correct fitment.

Related Components

Frequently Asked Questions

Q: Can I reuse the old seals from my WG190 if I only replace the metal parts in this kit?
A: No. The ZF 4657.183.398 LOOSE PARTS kit includes matched seals and retainers that are designed to work together. Reusing old seals will likely result in immediate fluid leaks and void any warranty on the installation.

Q: How do I know if my transmission needs this specific loose parts kit versus a full housing replacement?
A: If you observe oil weeping only at the mating surfaces between the HOUS.FRONT SECT and the rear section, this kit is the correct solution. If there is visible cracking or impact damage to the housing itself, you will need a full housing assembly.

Q: Is this kit compatible with the ZF WG180 if I also replace the rear housing?
A: Yes, provided you also install the correct HOUSING REAR SECTION for the WG180. The loose parts kit 4657.183.398 uses the same fastener pattern across the WG180, WG190, and WG200 series.