ZF 4699.303.188 SHIM RING | OEM Genuine Part

Overview

The ZF 4699.303.188 SHIM RING (SKU: 4699.303.188) is a precision-engineered OEM genuine component designed for critical axial clearance adjustment within heavy-duty ZF construction machinery transmissions. This hardened steel shim ring sits between the planetary gear set and the adjacent 4699101046 HOUSING, ensuring correct preload and alignment of rotating assemblies. By maintaining precise end-play tolerances, this shim ring prevents excessive gear wear and reduces vibration during high-torque operations. As a factory-specified part, it guarantees exact thickness and surface finish required for optimal transmission longevity.

Symptoms of Failure

• Transmission gear slipping under load: When the shim ring wears or compresses beyond specification, axial play increases, causing planetary gears to lose proper mesh engagement.
• Abnormal whining or grinding noise from the transmission housing: Worn shim rings allow metal-on-metal contact between the gear set and the 4699301109 HOUSING, generating distinct audible distress signals.
• Oil leaks at the bearing cover interface: Incorrect shim ring thickness distorts the seal surface of the 4699301017 BEARING COVER, leading to fluid migration past the O-ring.
• Premature bearing failure: Excessive axial clearance from a collapsed shim ring places uneven loads on thrust bearings, often requiring replacement of the 4699301085 COVER assembly.

Technical Specifications

Compatibility

This shim ring is primarily used in ZF WG180, WG200, and WG211 series powershift transmissions found in wheel loaders, dozers, and excavators. It also applies to select ZF Ecomat 5HP and 6HP automatic transmissions used in heavy construction vehicles. Always verify the exact thickness requirement using the service manual for your specific transmission model, as multiple shim thicknesses are available for fine-tuning end-play.

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