ZF 4644.231.123 SUCTION TUBE for WG200/WG201 | OEM Genuine Part

Overview

The ZF 4644.231.123 SUCTION TUBE is a critical hydraulic component designed for the WG200 and WG201 transmission series. This OEM genuine part ensures a consistent, uninterrupted flow of transmission fluid from the sump to the pump, preventing cavitation and maintaining proper lubrication pressure. Positioned within the lower valve body area, the suction tube (SKU: 4644.231.123) directly influences gear engagement smoothness and overall transmission longevity. When this tube is compromised, the entire hydraulic circuit loses efficiency, leading to performance degradation.

Symptoms of Failure

• Transmission fluid leaks at the sump gasket: A cracked or warped suction tube often causes visible oil drips near the pan rail, especially after the vehicle has been parked.
• Delayed or harsh gear engagement: Insufficient fluid supply due to a blocked or fractured tube results in sluggish shifting, particularly from Neutral to Drive or Reverse.
• Whining or cavitation noise from the pump: Air ingestion through a damaged suction tube creates a high-pitched whine under load, indicating the pump is starving for fluid.
• Intermittent gear slipping under acceleration: A failing tube can cause pressure drops that lead to momentary clutch pack slippage, often felt as a loss of power during uphill climbs.

Technical Specifications

Compatibility

This suction tube is engineered for ZF WG series transmissions, specifically the WG180, WG200, and WG201 models. It is also compatible with select WG160 variants that share the same hydraulic architecture. The part directly interfaces with the 4644105424 DISCONNECTION assembly and the 4644303538 OUTPUT FLANGE within the drivetrain. During installation, ensure the 0636021036 HEXAGON SCREW is torqued to specification to avoid leaks. The tube mounts directly to the 4644101224 TRANSMISSION HOUSING, making it a key element in the oil circuit.

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