Overview
The ZF 4661.373.004 INNER DISK CARRIER is a precision-machined component designed specifically for the WG 94 series of heavy-duty transmissions. This OEM genuine part serves as the structural hub that houses and aligns the clutch disk packs within the planetary gearset. Positioned directly inside the transmission housing, the carrier ensures proper torque transfer and smooth engagement between rotating elements. The SKU 4661.373.004 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit and long service life in demanding industrial applications. When paired with a 6073003011 CONTROL UNIT, this carrier maintains optimal hydraulic pressure distribution across the clutch plates.
Symptoms of Failure
- Erratic gear engagement or slipping: A worn inner disk carrier allows excessive axial play, causing clutch packs to disengage unexpectedly under load.
- Metallic grinding noises from the transmission: When the carrier’s splines or bearing surfaces degrade, metal-on-metal contact produces audible grinding during shifts.
- Low transmission oil pressure warnings: Cracks or deformation in the carrier body can disrupt internal oil galleries, leading to pressure drops and potential overheating.
- Visible metal debris in the oil pan: Flaking or spalling from the carrier’s hardened surfaces contaminates the lubricant, accelerating wear on adjacent components like the 4656183200 LOOSE PARTS kit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4661.373.004 |
| Material | Case-hardened alloy steel (16MnCr5 equivalent) |
| Outer Diameter | 210 mm (8.27 in) |
| Inner Diameter | 145 mm (5.71 in) |
| Height | 48 mm (1.89 in) |
| Weight | 2.85 kg (6.28 lbs) |
| OEM Reference | ZF 4661.373.004 |
| Surface Finish | Ground and phosphated |
Compatibility
This inner disk carrier is engineered for the ZF WG 94 series, which includes models such as WG180, WG200, and WG250. It directly replaces the original carrier in WG94 transmissions used in municipal trucks, construction loaders, and agricultural tractors. The part also fits select WG 92 variants with identical clutch pack configurations. For complete assembly, this carrier must be installed with the 4661101033 HOUSING and the 4661301096 HOUSING to ensure proper alignment of the planetary gearset.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656183200 | LOOSE PARTS | Fasteners and seals for carrier installation |
| 6073003011 | CONTROL UNIT | Hydraulic valve body for clutch modulation |
| 4661101033 | HOUSING | Main transmission case section |
| 4661301096 | HOUSING | Rear housing for output shaft support |
| 0631306174 | CYLINDRICAL PIN | Alignment pin for carrier positioning |
| 0769123894 | TYPE PLATE | Identification plate for transmission model |
| 0750100022 | SCREW PLUG | Oil drain plug for housing |
| 4660201008 | SCREW PLUG | Pressure test port plug |
| 0636100117 | SCREW PLUG | Magnetic plug for debris collection |
| 0501211384 | VALVE | Pressure relief valve for clutch circuit |
