ZF 4699.300.172 INNER DISK CARRIER | OEM Genuine Part

Overview

The ZF 4699.300.172 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 structural hub that houses and aligns the friction and steel disks, ensuring precise torque transfer during gear engagement. Positioned directly on the transmission input shaft, the carrier must withstand high axial loads and thermal stress. The SKU 4699.300.172 is precision-machined to maintain exacting tolerances, preventing disk misalignment that can lead to premature clutch failure. When paired with a robust 4699101152 HOUSING and a secure 4699309059 HOUSING COVER, this carrier forms the core of the clutch drum assembly.

Symptoms of Failure

• Erratic gear engagement and slipping under load: Worn splines or distorted carrier pockets cause the clutch disks to lose proper clamping force, resulting in delayed or incomplete gear shifts, especially during heavy excavation or grading operations.
• Metallic grinding noise during transmission operation: As the carrier’s internal splines wear, the disk tabs can contact the carrier wall, producing a distinct grinding sound that intensifies with higher RPMs.
• Contaminated transmission fluid with metallic debris: Friction between a failing carrier and the disks generates fine steel particles, which circulate through the hydraulic system and accelerate wear on pumps and valves.
• Oil leaks from the clutch housing area: A warped or cracked carrier can compromise the seal between the 0636101411 CAP SCREW mounting points, allowing pressurized oil to escape past the 0631302212 CYLINDRICAL PIN alignment holes.

Technical Specifications

Compatibility

This inner disk carrier is engineered for ZF WG-series powershift transmissions commonly used in construction machinery. It is a direct fit for the WG180 and WG200 transmission models, which are found in wheel loaders, dozers, and telehandlers from manufacturers such as Liebherr, Caterpillar, and Volvo. The carrier also serves the WG150 and WG210 variants where clutch pack configurations match the 85mm spline diameter. Always verify the spline count (typically 28-tooth) against your existing assembly before installation.

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