ZF 0730.063.204 RING | OEM Genuine Part

Overview

The ZF 0730.063.204 RING is an OEM genuine sealing component engineered for high-stress environments within ZF construction machinery transmissions. This precision-machined ring sits at critical interface points, typically between rotating shafts and stationary housings, to maintain hydraulic pressure and prevent fluid migration. The SKU 0730.063.204 is specifically designed to withstand extreme thermal cycling and particulate contamination common in heavy equipment applications. When installed correctly, this ring ensures consistent lubrication flow and protects adjacent components like the 4143101009 HOUSING from premature wear.

Symptoms of Failure

• Hydraulic pressure loss during load cycles – A worn 0730.063.204 ring allows internal bypass, causing sluggish transmission response under heavy loads.
• External oil seepage at housing joints – Visible fluid trails near the 4143301025 HOUSING indicate the ring has lost its sealing integrity.
• Erratic gear engagement in cold starts – Thickened oil cannot compensate for a degraded ring, leading to delayed clutch pack activation.
• Increased operating temperature – Fluid friction from a failed ring generates excess heat, often triggering thermal warning indicators.

Technical Specifications

Compatibility

This ring is a direct fit for ZF WG180, WG200, and WG250 series transmissions commonly used in wheel loaders, excavators, and telehandlers. It also applies to select ZF 4WG-310 and 6WG-350 models. Always verify the 0634313603 O-RING condition during replacement, as both components share sealing surfaces. For installations requiring a threaded closure, pair this ring with the 4475280018 SCREW PLUG to ensure proper torque retention.

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