ZF 4651.338.004 COVER for WG 100/WG 110 | OEM Genuine Part

Overview

The ZF 4651.338.004 COVER is a precision-engineered OEM genuine component designed for the WG 100 and WG 110 transmission series. This cover serves as the primary sealing interface for the transmission housing, protecting internal gear sets and hydraulic circuits from contamination while maintaining critical oil pressure. Positioned on the rear or side of the main assembly, it integrates directly with the TRANSMISSION HOUSING (4651101006) to form a leak-proof enclosure. The SKU 4651.338.004 is manufactured to ZF’s exacting tolerances, ensuring a precise fit that prevents fluid migration and structural fatigue under high-torque loads.

Symptoms of Failure

• External oil seepage around the cover perimeter: A worn or warped 4651.338.004 cover often leads to visible transmission fluid leaks, particularly after prolonged operation or thermal cycling.
• Contaminated transmission fluid: Cracks or corrosion in the cover allow dirt and moisture ingress, resulting in sludge buildup and reduced hydraulic efficiency.
• Abnormal gear engagement noise: When the cover loses structural integrity, internal pressure drops can cause delayed or harsh shifting in WG 100 series transmissions.
• Visible vibration or cover movement: Loose mounting points due to material fatigue indicate the cover is no longer securely mating with the HOUSING (4651301034).

Technical Specifications

Compatibility

This cover is specifically engineered for ZF WG 100 and WG 110 transmissions, commonly found in industrial material handling equipment, forklifts, and medium-duty powertrains. While primarily designed for these models, the 4651.338.004 may also be compatible with select WG 180 and WG 200 variants when used in conjunction with the correct O-RING (0634303928) and HOUSING (4651301013). Always verify fitment against your transmission’s serial number before installation.

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