ZF 5838.300.239 LUBRICATING NIPPLE | OEM Genuine Part

Overview

The ZF 5838.300.239 LUBRICATING NIPPLE is a precision-engineered OEM genuine part designed to deliver a controlled flow of lubricant to critical bearing surfaces within ZF heavy-duty transmissions. Positioned directly on the transmission housing or axle assembly, this nipple serves as the primary entry point for grease or oil, ensuring that internal gears and shafts maintain proper lubrication under extreme loads. The SKU 5838.300.239 is manufactured to exact ZF tolerances, preventing contamination ingress while allowing maintenance technicians to service the unit efficiently. This component is often replaced during a full transmission overhaul alongside the 2098117002: HOUSING and the 2098301052: REAR AXLE HOUS. to restore complete sealing integrity.

Symptoms of Failure

• Lubricant starvation and gear whining: A clogged or deformed nipple restricts grease flow, causing high-pitched noise from the transmission during operation.
• External oil seepage around the fitting: Cracks in the nipple body or a damaged sealing seat lead to slow oil leaks, often visible as wet spots on the 0636103300: STUD or adjacent housing.
• Difficulty during routine greasing: If the nipple fails to accept a grease gun coupler or allows backflow, the lubrication system cannot pressurize, leading to premature bearing wear.
• Contaminated lubricant entering the system: A missing or broken dust cap on the nipple permits dirt and moisture to bypass the seal, accelerating internal component degradation.

Technical Specifications

Compatibility

This lubricating nipple is a standard service part across multiple ZF transmission families, particularly the WG180, WG200, and WG250 series used in construction machinery. It also fits select models of the ZF Ecomat and Ecolife transmissions where a threaded grease point is specified. When replacing this nipple, always inspect the mating threads on the 0637101164: HEXAGON NUT and the corresponding housing bore for galling or cross-threading to ensure a leak-free seal.

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