ZF 0501.338.176 OIL SIGHT GLASS | OEM Genuine Part

Overview

The ZF 0501.338.176 OIL SIGHT GLASS is a critical visual diagnostic component engineered for heavy-duty construction machinery transmissions. This OEM genuine part provides a clear, at-a-glance indication of transmission fluid level and condition, allowing operators to verify proper lubrication without disassembly. Positioned on the transmission housing or sump, the sight glass enables immediate detection of oil contamination, aeration, or low fluid levels. The SKU 0501.338.176 is precision-manufactured to ZF’s exacting standards, ensuring a leak-proof seal and optical clarity under extreme thermal and vibrational loads common in excavators, wheel loaders, and graders. When inspecting the driveline, always verify the condition of the 2099109016 DIFFERENTIAL and 0750117075 TAPER ROLLER BEARING for correlated wear patterns.

Symptoms of Failure

When the ZF 0501.338.176 oil sight glass deteriorates, operators will notice distinct performance issues. Transmission fluid leaking from the sight glass housing is the most common failure, often presenting as a slow drip around the glass perimeter. Cloudy or opaque viewing window prevents accurate fluid level checks, leading to potential overfilling or underfilling. Gear slipping or delayed engagement can occur if the sight glass failure allows air ingress, causing hydraulic cavitation. Contaminated oil visible through cracks in the glass indicates imminent catastrophic failure. For long-tail searches like “ZF transmission oil sight glass leaking symptoms” or “construction machinery gear slipping due to low fluid,” this part is the primary culprit.

Technical Specifications

Compatibility

This genuine ZF oil sight glass is designed for use in the following transmission models commonly found in construction machinery: WG180, WG200, WG210, and WG310 series. It also fits select Ecomat 4HP and 5HP series transmissions used in wheel loaders and dump trucks. Always cross-reference the 2093209094 DIFFERENTIAL and 2093309078 DIFF.HOUSING when servicing the entire drivetrain assembly.

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