ZF 5838.300.318 BREATHER | OEM Genuine Part

Overview

The ZF 5838.300.318 BREATHER is a critical ventilation component designed for heavy-duty construction machinery transmissions. This OEM genuine part equalizes internal pressure within the transmission housing, preventing contaminant ingress while allowing hot oil vapors to escape. Positioned on the upper casing of ZF drivelines, the breather ensures the hydraulic system remains free of moisture and debris. The SKU 5838.300.318 is engineered to maintain optimal air exchange, directly supporting the longevity of adjacent assemblies such as the 5838022003: REAR AXLE and the 5838109001: DIFFERENTIAL.

Symptoms of Failure

• Oil leaks around the transmission top cover: A clogged or cracked breather prevents pressure release, forcing lubricant past seals. This is a common “transmission breather leaking oil” issue.
• Milky or contaminated transmission fluid: When the breather fails, moisture and dirt are drawn into the housing, leading to “water in transmission oil” symptoms.
• Erratic gear engagement or whining noise: Pressure buildup from a blocked breather can cause cavitation in the hydraulic circuit, resulting in “transmission whining under load” complaints.
• Premature wear of differential components: Overpressure stresses seals and bearings, accelerating failure of parts like the 0750117075: TAPER ROLLER BEARING.

Technical Specifications

Compatibility

This breather is a direct replacement for ZF transmissions commonly found in wheel loaders, graders, and telehandlers. It is compatible with the following ZF models: WG180, WG200, WG210, and 4WG200 series. The part also integrates with the 5838300128: DIFFERENTIAL HOUSING to maintain proper ventilation in the final drive assembly. Always verify thread pitch and housing clearance before installation.

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