ZF 4644.238.003 TUBE for WG201 | OEM Genuine Part

Overview

The ZF 4644.238.003 TUBE is a precision-engineered hydraulic fluid conduit designed specifically for the WG 201 series powershift transmission. This OEM genuine part serves as a critical pressure line within the valve body assembly, directing ATF to the clutch packs and torque converter lock-up circuit. Manufactured to ZF’s exacting tolerances, the 4644.238.003 tube ensures consistent oil flow and pressure integrity during high-torque operations. It interfaces directly with the TRANSMISSION HOUSING (4644101172) and the TRANSMISSION HOUSING (4644301390), forming a sealed circuit that prevents cross-contamination between lubrication and actuation galleries.

Symptoms of Failure

• External ATF seepage at tube-housing junction – A worn or corroded 4644.238.003 tube often causes visible oil drips near the bellhousing, especially after cold starts.
• Erratic shift timing and clutch slip – When the tube develops micro-cracks, hydraulic pressure drops, leading to delayed engagement or soft shifts under load.
• Torque converter shudder at low RPM – A compromised tube disrupts lock-up pressure, producing a vibration felt through the driveline during 2nd-to-3rd gear transitions.
• Transmission overheating – Reduced flow through a deformed tube forces the pump to work harder, raising sump temperatures above 120°C.

Technical Specifications

Compatibility

This tube is engineered for the ZF WG 201 series, which includes the WG180, WG200, and WG210 models commonly found in mobile cranes, forklifts, and mining loaders. It also fits select WG 211 variants with the same valve body architecture. Always verify the TYPE PLATE (0730365067) on your transmission to confirm series compatibility. The 4644.238.003 tube works in conjunction with the THREADED BUSH (4644301189) and SCREW PLUG (0636302005) to secure the hydraulic circuit.

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