ZF 0501.217.910 OIL SIGHT GLASS

Overview

The ZF 0501.217.910 OIL SIGHT GLASS is a critical visual diagnostic component mounted directly on the transmission housing of heavy-duty construction machinery. This OEM genuine part allows operators and technicians to quickly verify fluid levels and oil condition without opening the system, preventing contamination and reducing downtime. The SKU 0501.217.910 is engineered to withstand high thermal cycling and vibration common in ZF drivelines, providing a clear, distortion-free view of the lubricant reservoir. It sits at a strategic low-pressure point on the transmission case, often near the sump, ensuring accurate readings even under extreme operating angles.

Symptoms of Failure

• Oil seepage around the sight glass perimeter: A worn or cracked 0501.217.910 seal leads to slow lubricant loss, leaving oily residue on the transmission housing.
• Cloudy or discolored viewing window: Internal degradation of the glass or polycarbonate lens obscures fluid level checks, making it impossible to assess oil clarity or contamination.
• Transmission overheating without visible cause: When the sight glass fails, low oil levels go undetected, causing increased friction and thermal stress on internal components like the 2095109019: DIFFERENTIAL.
• Intermittent gear engagement hesitation: Insufficient lubrication from undetected leaks accelerates wear on the 0750117075: TAPER ROLLER BEARING, leading to rough shifting.

Technical Specifications

Compatibility

This oil sight glass is designed for ZF powershift transmissions commonly used in wheel loaders, graders, and excavators. It fits the WG180, WG200, and WG210 series, as well as the 4WG-200 and 6WG-200 variants. The 0501.217.910 also applies to select ZF steering axles and transfer cases where a M22 port is present. For full driveline restoration, pair this part with the 2095209037: DIFFERENTIAL and the 2095309059: DIFF.HOUSING to ensure complete sealing and alignment.

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