ZF 4646.201.018 COVER SHEET for WG251 | OEM Genuine Part

Overview

The ZF 4646.201.018 COVER SHEET is a critical sealing and protective component designed for the WG 251 series of heavy-duty automatic transmissions. This OEM genuine part sits on the exterior of the transmission housing, serving as a barrier against contaminants while maintaining internal oil pressure. Specifically, it encloses the valve body or clutch pack access area, ensuring that hydraulic fluid remains contained and debris does not enter the precision-machined assembly. The SKU 4646.201.018 is precision-engineered to ZF’s exacting tolerances, making it essential for maintaining the integrity of the transmission’s hydraulic circuit. When paired with the 4646101072: TRANSMISSION HOUSING and the 4646301201: HOUSING, this cover sheet creates a sealed environment that prevents fluid migration and structural fatigue.

Symptoms of Failure

When the ZF 4646.201.018 COVER SHEET begins to degrade, operators often notice distinct warning signs. Oil leaks around the WG251 transmission bell housing are the most common symptom, as the gasket surface wears or the metal sheet corrodes. Another frequent issue is erratic gear engagement or delayed shifting, caused by a loss of hydraulic pressure when the cover sheet no longer seals properly. You may also detect contaminated transmission fluid with metallic particles, indicating that the cover sheet has allowed external grit to enter the system. Finally, vibration or noise from the transmission side cover area can occur if the sheet becomes loose or warped, often due to overtightened 0636101051: CAP SCREW fasteners.

Technical Specifications

Compatibility

This COVER SHEET is specifically engineered for the ZF WG 251 series, but it also fits several other ZF transmission models due to shared housing designs. It is compatible with the WG180, WG200, and WG250 series, as well as the WG300 in certain configurations. The part interfaces directly with the 4646301166: COVER and the transmission housing assembly. Always verify your transmission’s serial number against the ZF parts catalog, as variations exist between early and late production runs. For a complete seal, ensure the 4646101072: TRANSMISSION HOUSING is free of burrs before installation.

Related Components