ZF 4642.306.109 SCREW PLUG for WG181 | OEM Genuine Part

Overview

The ZF 4642.306.109 SCREW PLUG is a precision-engineered sealing component designed for the WG 181 series transmission. This OEM genuine part functions as a critical closure element within the hydraulic control system, preventing fluid loss and maintaining system pressure. Positioned in the lower valve body or sump area of the transmission, the SKU 4642.306.109 ensures that lubricating oil remains contained during high-torque operations. When installed alongside the TRANSMISSION HOUSING, this screw plug provides a leak-proof interface that supports the overall durability of the drivetrain assembly.

Symptoms of Failure

• Persistent oil seepage around the drain port — A worn or stripped 4642.306.109 screw plug often causes slow, progressive fluid loss, leading to low transmission oil levels and potential overheating.
• Gear engagement hesitation or slipping — When the plug fails to seal properly, hydraulic pressure drops, resulting in delayed clutch pack engagement and erratic shifting behavior.
• Visible thread damage or cross-threading — Repeated removal and reinstallation can deform the plug threads, making it difficult to achieve a tight seal and causing contamination ingress.
• Increased operating noise from the gear train — Insufficient oil retention due to a faulty screw plug leads to inadequate lubrication, producing whining or grinding sounds during acceleration.

Technical Specifications

Compatibility

This screw plug is engineered for the ZF WG 181 series, but it also fits select models in the WG 180, WG 200, and WG 210 families due to shared sump and housing designs. It directly interfaces with the HOUSING component and works in conjunction with the THREADED BUSH to create a secure mounting point. For proper identification, always verify the TYPE PLATE on your transmission to confirm model compatibility before installation.

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