Overview
The ZF 4661.376.003 INNER DISK CARRIER is a critical rotating assembly component engineered specifically for the WG 94 Series transmissions. This OEM genuine part functions as the central hub that houses and aligns the clutch disk packs, transmitting torque from the input shaft to the planetary gear sets. Positioned within the main transmission housing, the inner disk carrier must maintain precise axial clearance and concentricity to ensure proper clutch engagement. The SKU 4661.376.003 is manufactured to ZF’s original tolerances, making it a direct replacement for worn units in heavy-duty commercial vehicle drivelines.
Symptoms of Failure
- Delayed or harsh gear engagement: When the inner disk carrier wears at its spline interfaces or bearing journals, clutch packs cannot seat properly, causing noticeable shift lag or abrupt engagement during acceleration.
- Metallic grinding noise from transmission: A worn carrier allows excessive radial play, leading to contact between the disk carrier and the surrounding TRANSMISSION HOUSING, producing a distinct grinding sound under load.
- Transmission fluid contamination with metallic debris: Fatigue cracks or surface spalling on the carrier’s splines shed fine metal particles into the oil, often visible during routine drain intervals.
- Intermittent power loss under torque: A compromised carrier cannot maintain proper clutch pack compression, resulting in momentary slippage when climbing grades or hauling heavy loads.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4661.376.003 |
| OEM Reference | ZF 4661 376 003 |
| Material | High-strength alloy steel, induction-hardened |
| Outer Diameter | ~210 mm (estimated) |
| Inner Diameter (spline) | ~45 mm (estimated) |
| Overall Length | ~95 mm (estimated) |
| Weight | ~3.8 kg (estimated) |
| Mounting Holes | 6x M10 threaded (estimated) |
| Compatible Clutch Packs | WG94 series multi-disc |
Compatibility
This inner disk carrier is designed for the ZF WG 94 Series transmission family, which includes models such as the WG180, WG200, and WG210. It is also compatible with certain variants of the WG120 and WG150 when used in conjunction with the correct HOUSING assembly. The part interfaces directly with the CYLINDRICAL PIN that aligns the carrier to the transmission case, and the TYPE PLATE should be verified for exact model identification before installation. Always cross-reference your transmission’s serial number against ZF’s application charts to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101013 | TRANSMISSION HOUSING | Encloses and supports all rotating assemblies |
| 4661301022 | HOUSING | Intermediate casing for clutch and valve body |
| 0631306174 | CYLINDRICAL PIN | Precise alignment dowel for carrier positioning |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 0750100022 | SCREW PLUG | Seals oil passages in the housing |
| 4660201008 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0636100117 | SCREW PLUG | Pressure test port plug |
| 0501211384 | VALVE | Modulates hydraulic flow to clutch packs |
| 0732042156 | COMPRESSION SPRING | Provides return force for valve spools |
| 0636100820 | SCREW PLUG | Seals accumulator circuit access |
