ZF 4661.221.001 SUCTION TUBE for WG90/WG94 | OEM Genuine Part

Overview

The ZF 4661.221.001 SUCTION TUBE is a critical fluid delivery component engineered for the WG 90 and WG 94 series transmissions. This OEM genuine part, identified by SKU 4661.221.001, is positioned within the transmission’s oil sump and pump circuit, where it draws hydraulic fluid from the pan and directs it to the pump inlet. By maintaining a consistent, unrestricted flow of oil, this tube ensures proper lubrication and cooling of internal assemblies such as the 4661101001: TRANSMISSION HOUSING and the 4661301007: HOUSING. Without a fully functional suction tube, the transmission risks oil starvation, leading to accelerated wear and potential failure.

Symptoms of Failure

When the ZF 4661.221.001 SUCTION TUBE degrades or becomes damaged, operators may notice several distinct failure indicators. Common symptoms include:

• Oil leaks at the pump inlet: Cracks or loose fittings in the tube allow hydraulic fluid to escape, often visible as drips under the transmission.
• Erratic gear engagement or slipping: Insufficient oil flow due to a blocked or collapsed tube reduces hydraulic pressure, causing delayed or rough shifting.
• Whining or cavitation noise: Air entering the system through a damaged suction tube creates a high-pitched sound from the pump, indicating low fluid volume.
• Overheating transmission: Reduced oil circulation leads to inadequate cooling, triggering temperature warnings or thermal shutdowns.

Technical Specifications

Compatibility

This suction tube is specifically designed for the ZF WG 90 and WG 94 series transmissions. Based on its design and port configuration, it is also compatible with the following ZF models: WG180, WG200, WG210, and WG250. It integrates directly with the 4661301093: TUBE and is secured using a 0631306174: CYLINDRICAL PIN to prevent rotation during operation. Always verify your transmission model and serial number before installation.

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