ZF 4661.138.005 FILTER for WG 90/WG 94 | OEM Genuine Part

Overview

The ZF 4661.138.005 FILTER is a critical hydraulic filtration component engineered specifically for the WG 90 and WG 94 series transmissions. Positioned within the valve body circuit, this genuine OEM part ensures that transmission fluid remains free of particulate contaminants, protecting sensitive internal components from abrasive wear. The SKU 4661.138.005 directly replaces the factory-installed filter, maintaining the precise flow rate and micron rating required for optimal clutch pack engagement and torque converter lock-up. When installed alongside the 4661101020: TRANSMISSION HOUSING and the 4661301046: HOUSING II, this filter forms the backbone of the transmission’s fluid management system.

Symptoms of Failure

• Erratic gear engagement or slipping: A clogged 4661.138.005 filter restricts hydraulic pressure, causing delayed or soft shifts between forward and reverse gears.
• Overheating transmission fluid: Restricted flow forces the pump to work harder, generating excess heat that can degrade seals and accelerate wear.
• Whining or humming noise from the pump: Cavitation occurs when the filter cannot supply adequate fluid volume, producing audible distress sounds during operation.
• Visible metallic debris in the oil pan: A failed filter allows particles to circulate, leading to scoring on the 0631306174: CYLINDRICAL PIN and other precision-machined surfaces.

Technical Specifications

Compatibility

This filter is engineered for the ZF WG 90 and WG 94 transmission families, which include the WG180, WG200, WG210, and WG250 models commonly found in off-highway trucks, wheel loaders, and agricultural tractors. It also fits select WG 92 variants. The 4661.138.005 interfaces directly with the 4661301093: TUBE that routes fluid to the cooler circuit. For complete assembly integrity, always inspect the sealing surfaces of the transmission housing and replace the filter during major service intervals.

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