ZF 4646.201.019 COVER SHEET for WG251 | OEM Genuine Part

Overview

The ZF 4646.201.019 COVER SHEET is a critical sealing and protective component designed for the WG 251 series transmission. Positioned at the interface between the main casing and the torque converter housing, this OEM genuine part prevents fluid contamination and maintains hydraulic pressure integrity. The SKU 4646.201.019 ensures precise fitment within the clutch pack assembly, where it acts as a barrier against debris ingress while supporting the oil flow path. When paired with the 4646101072: TRANSMISSION HOUSING and the 4646301201: HOUSING, this cover sheet completes the sealed chamber necessary for consistent gear engagement in heavy-duty applications.

Symptoms of Failure

• Hydraulic pressure loss during acceleration: A worn 4646.201.019 cover sheet can cause internal bypass, leading to delayed shifts or gear slipping under load—a common issue in WG251 transmissions operating at high torque.
• External oil seepage near the bell housing: Cracks or deformation in the cover sheet allow transmission fluid to escape, often mistaken for a main seal failure. Look for drips around the joint where the 4646301166: COVER meets the housing.
• Contaminated fluid with metallic particles: When the cover sheet degrades, it fails to shield the clutch packs from wear debris, accelerating internal damage. This symptom often accompanies a failing 0636101051: CAP SCREW that cannot maintain clamping force.
• Audible whining or grinding from the converter area: Misalignment caused by a warped cover sheet creates abnormal contact between rotating elements, producing noise that worsens as fluid temperature rises.

Technical Specifications

Compatibility

This cover sheet is engineered for the ZF WG 251 series, but it also fits select models in the WG180, WG200, and WG210 families when used with the correct 0636101051: CAP SCREW kit. It is directly interchangeable with earlier revisions in the WG250 platform. Always verify the housing bore diameter against your transmission’s serial number—the 4646.201.019 is specifically designed for units produced after 2015 with the updated 4646301201: HOUSING casting. For retrofit applications, confirm that the 4646101072: TRANSMISSION HOUSING has the corresponding recess depth.

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