ZF 5840.303.108 NIPPLE | OEM Genuine Part

Overview

The ZF 5840.303.108 NIPPLE is a precision-machined hydraulic fitting engineered for the lubrication and pressure circuits within ZF heavy-duty construction machinery transmissions. This OEM genuine part serves as a critical interface point, directing oil flow between the main transmission housing and external cooler lines or pressure sensors. The SKU 5840.303.108 is specifically designed to maintain consistent hydraulic pressure and prevent contamination ingress at the connection point. It is typically seated on the upper valve body or side cover of the transmission assembly, where it interfaces with the 2098117002: HOUSING to ensure a sealed, leak-free fluid path.

Symptoms of Failure

• Hydraulic fluid seepage at the nipple base: A worn or cracked 5840.303.108 nipple often produces a slow, steady oil leak around the threaded connection, leaving visible drips on the 2098301052: REAR AXLE HOUS. and surrounding components.
• Erratic transmission pressure readings: When the nipple’s sealing surface degrades, internal pressure drops cause inconsistent clutch engagement, leading to delayed shifts or gear hunting during operation.
• Air ingestion into the hydraulic system: A compromised nipple allows air to mix with transmission fluid, resulting in foamy oil, spongy pedal feel, and reduced torque converter efficiency.
• External contamination buildup: Dirt and debris accumulate around a failing nipple, accelerating wear on adjacent seals and the 0636103300: STUD fasteners that secure the assembly.

Technical Specifications

Compatibility

This nipple is a direct fit for ZF WG180, WG200, and WG210 series transmissions commonly used in wheel loaders, telehandlers, and excavators. It also applies to select ZF Ecolife and PowerShift models where the hydraulic control block uses M14 ports. Always verify the thread pitch and sealing surface condition against your specific transmission variant. The nipple works in conjunction with the 0637101164: HEXAGON NUT to secure hydraulic lines, and its failure often necessitates inspection of the adjacent brake housing assembly.

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