ZF 4646.231.042 OIL LEVEL TUBE for WG251 | OEM Genuine Part

Overview

The ZF 4646.231.042 OIL LEVEL TUBE is a precision-engineered component designed for the WG 251 transmission series. This genuine OEM part ensures accurate fluid level measurement within the transmission sump, preventing both overfilling and underfilling that can lead to premature wear. Installed directly into the TRANSMISSION HOUSING, the tube provides a clear, reliable path for dipstick insertion and oil return. The SKU 4646.231.042 is manufactured to ZF’s exacting tolerances, guaranteeing a leak-free seal and consistent performance in heavy-duty industrial applications.

Symptoms of Failure

• Oil leaks around the transmission housing: A cracked or warped oil level tube allows transmission fluid to escape, often pooling beneath the vehicle or equipment. This is a common indicator that the 4646.231.042 part requires replacement.
• Inaccurate fluid level readings: When the tube becomes blocked or deformed, dipstick readings become unreliable, leading to gear slipping or overheating due to incorrect oil volume.
• Contaminated transmission fluid: A damaged tube can allow dirt and moisture to enter the system through the dipstick port, accelerating wear on internal components like the HOUSING and clutch packs.
• Hard shifting or delayed engagement: Low fluid levels caused by a leaking tube reduce hydraulic pressure, resulting in sluggish gear changes and increased friction.

Technical Specifications

Compatibility

This oil level tube is specifically engineered for the ZF WG 251 series, but it also fits select models in the WG180, WG200, and WG210 families due to shared housing designs. Always verify fitment with your transmission’s serial number. The tube mounts directly to the COVER assembly and is secured using a CAP SCREW to prevent vibration loosening. For complete assembly, ensure the housing and cover are free of debris before installation.

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