ZF 4657.199.018 LOOSE PARTS for WG190 | OEM Genuine Part

Overview

Within the ZF WG 190 Series transmission, the ZF 4657.199.018 LOOSE PARTS kit serves as a critical service assembly containing the internal fasteners, locating pins, and small hardware required to secure the main structural casings. This OEM genuine part, identified by SKU 4657.199.018, ensures that the TRANSMISSION HOUSING remains precisely aligned with the HOUS.FRONT SECT and the HOUSING REAR PART. Without this specific loose parts set, the transmission cannot maintain the structural integrity required for high-torque industrial applications.

Symptoms of Failure

When the components within the 4657.199.018 kit degrade or are lost during service, operators will encounter distinct operational issues. Look for these specific failure symptoms:

• Transmission case oil seepage: Worn or missing CYLINDRICAL PIN elements allow the housing flanges to shift, breaking the seal between the front and rear sections.
• Gear engagement hesitation: Loose fasteners cause micro-movement of the HOUS.FRONT SECT, leading to misalignment of the input shaft bearings.
• Abnormal vibration during load shifts: A compromised loose parts assembly fails to dampen torsional forces, transmitting vibration through the driveline.
• Difficulty maintaining hydraulic pressure: Distortion of the TRANSMISSION HOUSING due to uneven clamping force from degraded cap screws results in internal fluid bypass.

Technical Specifications

Compatibility

This LOOSE PARTS kit is engineered primarily for the WG 190 Series transmission family. Based on the part type and fastener geometry, it is also compatible with the WG180 and WG200 series models that share the same three-piece housing architecture. The kit directly interfaces with the TRANSMISSION HOUSING (part 4657101033) and the HOUS.FRONT SECT (part 4657201027). Always verify your transmission’s serial number before ordering, as revisions to the HOUSING REAR PART may require updated hardware.

Related Components

Frequently Asked Questions

Q: Can I reuse the old fasteners from my WG190 instead of buying this 4657.199.018 kit?
A: ZF strongly discourages reusing fasteners from the loose parts assembly. The CYLINDRICAL PIN and cap screws are torque-to-yield components that lose clamping force after initial installation, leading to the failure symptoms described above.

Q: Does this kit include the gaskets for the TRANSMISSION HOUSING and HOUS.FRONT SECT?
A: No. The 4657.199.018 LOOSE PARTS kit contains only metallic hardware (pins, screws, washers, plates). You must order the appropriate sealant or gasket separately for the HOUSING REAR PART interface.

Q: How do I verify this part fits my WG180 transmission?
A: Cross-reference your transmission’s serial number against the ZF parts catalog. The TRANSMISSION HOUSING casting number (4657101033) must match the bolt pattern of the HOUS.FRONT SECT (4657201027) for this kit to be compatible.