ZF 0730.063.389 RING | OEM Genuine Part

Overview

The ZF 0730.063.389 RING is an OEM genuine sealing component engineered for high-stress environments within ZF construction machinery transmissions. This precision-machined ring sits between the 4143101009 HOUSING and the 4143301025 HOUSING assembly, where it creates a critical static seal to prevent fluid migration between hydraulic circuits. The SKU 0730.063.389 is specifically designed to withstand the extreme pressure spikes and thermal cycling common in heavy-duty off-highway applications, ensuring consistent clutch pack lubrication and torque converter operation.

Symptoms of Failure

• External oil seepage at housing joint: When the 0730.063.389 ring loses its dimensional integrity, operators may notice fluid weeping from the seam between the two housing sections, often mistaken for a gasket failure.
• Erratic gear engagement under load: A worn ring allows cross-port leakage, causing delayed or harsh shifts when the transmission is working at maximum capacity in excavators or wheel loaders.
• Low hydraulic pressure warnings: Degradation of this seal directly reduces system pressure, triggering dashboard alerts and reducing torque transmission efficiency during demanding operations.
• Contaminated transmission fluid: A failing ring permits mixing of lubricating oil with hydraulic fluid, leading to accelerated wear of downstream components like the 0634313603 O-RING and valve bodies.

Technical Specifications

Compatibility

This ring is a direct fit for ZF’s WG series powershift transmissions commonly deployed in construction machinery. It is verified for use in WG180, WG200, and WG210 models, as well as select Ecomat 4HP variants used in telehandlers and graders. The 0730.063.389 ring is always replaced in conjunction with the 4475280018 SCREW PLUG during housing resealing procedures to ensure proper compression and alignment.

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