ZF 4660.221.029 SUCTION TUBE for WG92/WG98 | OEM Genuine Part

Overview

The ZF 4660.221.029 SUCTION TUBE is a critical hydraulic component engineered specifically for the WG92 and WG98 transmission series. This genuine OEM part channels low-pressure transmission fluid from the sump to the pump inlet, ensuring consistent lubrication and cooling within the gear train. The SKU 4660.221.029 is precision-machined to maintain optimal fluid flow, preventing cavitation that can damage internal assemblies. It sits directly within the 4660101017: TRANSMISSION HOUSING, where it interfaces with the pump pickup point. Without this tube, the transmission cannot draw oil, leading to immediate system failure.

Symptoms of Failure

• Intermittent gear slipping under load: A cracked or blocked suction tube restricts fluid volume, causing the clutch packs to lose hydraulic pressure during heavy operation.
• Low transmission fluid pressure warnings: Worn seals or a fractured tube allow air ingestion, triggering pressure drop alerts on the dash or diagnostic system.
• Visible oil leaks near the pump housing: Degraded O-rings or a loose tube connection at the 4660301054: HOUSING II interface will weep fluid, leaving puddles under the vehicle.
• Whining or cavitation noise from the transmission: A collapsed suction tube creates turbulence and air bubbles, producing a distinct high-pitched whine during acceleration.

Technical Specifications

Compatibility

This suction tube is designed for ZF WG92 and WG98 series transmissions, commonly found in heavy-duty trucks and off-highway equipment. It is also compatible with the WG180 and WG200 models when used with the appropriate 0631306174: CYLINDRICAL PIN for alignment. Always verify the mounting flange matches your specific housing variant. The part is not backward-compatible with older WG80 series units without modifying the 0769123894: TYPE PLATE assembly.

Related Components