ZF 4661.138.002 FILTER for WG 90/WG 94 | OEM Genuine Part

Overview

The ZF 4661.138.002 FILTER is a critical hydraulic filtration component engineered for the WG 90 and WG 94 series transmissions. Positioned within the valve body assembly, this OEM genuine part ensures that transmission fluid remains free of particulate contaminants, safeguarding internal clearances and maintaining consistent clutch engagement pressure. The SKU 4661.138.002 is specifically designed to integrate with the main 4661101015: TRANSMISSION HOUSING, where it filters fluid before it reaches the torque converter and planetary gear sets. Without this filter, debris can bypass the system and accelerate wear on the 4661301024: HOUSING and its internal bores.

Symptoms of Failure

• Erratic shifting or gear slippage – A clogged filter restricts fluid flow, causing delayed or harsh shifts under load.
• Transmission overheating – Reduced oil circulation leads to elevated operating temperatures, often accompanied by a burnt smell.
• Whining or humming noise from the pump – Starvation of the hydraulic pump due to a blocked filter creates cavitation noise.
• Visible metal particles in the oil pan – When the filter media degrades, fine metallic debris bypasses the element and settles in the sump.

Technical Specifications

Compatibility

This filter is a direct replacement for the WG 90 and WG 94 series transmissions. It also fits the following ZF models when used with the correct 0631306174: CYLINDRICAL PIN for alignment: WG 120, WG 150, WG 180, and WG 200. Always verify the 0769123894: TYPE PLATE on your transmission to confirm the exact series before installation.

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