ZF 4699.303.230 INNER DISK CARRIER | OEM Genuine Part

Overview

The ZF 4699.303.230 INNER DISK CARRIER is a critical rotating component within the clutch pack assembly of heavy-duty ZF powershift transmissions. This OEM genuine part functions as the central hub that houses and drives the friction and steel disks, transferring torque from the input shaft to the planetary gear sets. Precision-machined from high-strength alloy steel, the carrier ensures even load distribution across the clutch disks, preventing premature wear. The SKU 4699.303.230 is specifically designed to withstand the extreme axial loads and thermal cycling common in construction machinery applications such as wheel loaders, graders, and dozers.

Symptoms of Failure

• Erratic gear engagement or slipping under load: When the inner disk carrier splines or disk retention lugs wear, the clutch pack fails to lock up properly, causing the transmission to slip during acceleration or under heavy digging loads.
• Metallic grinding noise from the transmission housing: A worn carrier can allow the disk stack to wobble, creating intermittent metal-on-metal contact with the HOUSING (4699101159) or the HOUSING (4699301254), producing a distinct grinding sound during gear shifts.
• Contaminated transmission fluid with metallic particles: As the carrier surface degrades, fine steel shavings enter the hydraulic circuit, often visible during oil changes as a “glitter” in the fluid. This accelerates wear on the SEALING RING (0634801038) and other internal seals.
• Intermittent loss of forward or reverse drive: A cracked or warped carrier prevents the clutch pack from fully compressing, leading to intermittent drive loss that worsens as transmission oil temperature rises.

Technical Specifications

Compatibility

This inner disk carrier is engineered for ZF WG-series powershift transmissions commonly found in construction and mining equipment. Based on its dimensional profile and spline count, the 4699.303.230 is compatible with the following ZF transmission models: WG180, WG200, WG210, and select variants of the WG160 series. It is frequently used in clutch packs C2 and C3 (forward/reverse clutches). Always verify the spline tooth count and carrier thickness against your existing part before installation. For complete clutch pack rebuilds, consider pairing this carrier with the HOUSING KIT (4699298049) and the HOUSING COVER (4699309123) to ensure proper axial clearance.

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