Overview
The ZF 4661.371.001 INNER DISK CARRIER is a precision-machined core component designed for the clutch pack assembly within ZF WG90 and WG94 series transmissions. This OEM genuine part functions as the rotating hub that houses and aligns the inner friction disks, ensuring consistent torque transfer during gear shifts. Located within the main gearset, the carrier interfaces directly with the TRANSMISSION HOUSING to maintain proper clutch stack clearance. The SKU 4661.371.001 is manufactured to ZF’s original tolerances, making it a direct replacement for worn units in heavy-duty industrial drivelines.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the inner disk carrier splines wear, friction disks lose their grip, causing the transmission to slip during acceleration or hill climbs.
- Metallic grinding noise from the clutch housing: A worn carrier allows excessive radial play, leading to metal-on-metal contact between the disks and the HOUSING.
- Oil contamination with bronze or steel particles: Degraded carrier surfaces shed material into the hydraulic circuit, often clogging the NOZZLE (4661301029) and reducing lubrication flow.
- Delayed shift response in cold conditions: A warped carrier distorts clutch pack clearances, causing sluggish engagement until the transmission reaches operating temperature.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4661.371.001 |
| Material | High-strength nodular cast iron (GGG-40) |
| Outer Diameter | 185 mm (7.28 in) |
| Inner Diameter | 120 mm (4.72 in) |
| Overall Height | 42 mm (1.65 in) |
| Weight | 1.85 kg (4.08 lbs) |
| Spline Count | 28 internal splines |
| OEM Reference | ZF 4661.371.001 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This inner disk carrier is engineered for ZF’s WG series powershift transmissions. It is a direct fit for the WG90 and WG94 series, commonly found in mobile cranes, forklifts, and construction equipment. The part also serves as a service replacement for earlier WG180 and WG200 variants when used with the correct CYLINDRICAL PIN (0631306174) for alignment. Always verify your transmission’s serial number against the OEM parts catalog before installation. The carrier works in conjunction with the TUBE (4661301093) for oil routing to the clutch pack.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101001 | TRANSMISSION HOUSING | Encloses the gearset and supports the carrier assembly |
| 4661301007 | HOUSING | Outer clutch housing that mates with the carrier |
| 4661301093 | TUBE | Oil feed tube for clutch pack lubrication |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for carrier-to-housing positioning |
| 0769123894 | TYPE PLATE | Identification plate for transmission model |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports on the housing |
| 0636302602 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0634100633 | O-RING | Seals the carrier-to-housing interface |
| 4661301029 | NOZZLE | Spray nozzle for clutch cooling oil |
| 4661301027 | NOZZLE | Secondary spray nozzle for disk lubrication |
