Overview
The ZF 0501.228.273 INNER CLUTCH DISK is a critical friction component engineered for the WG92 transmission series and its closely related variants. This genuine OEM part sits within the clutch pack assembly, where it transfers torque between rotating elements during gear shifts. Designed to withstand high thermal loads and continuous hydraulic pressure, the 0501.228.273 disk ensures smooth engagement and disengagement of planetary gear sets. As a direct replacement for worn units, this SKU restores the precise clamping force required for reliable power delivery in heavy-duty industrial applications. The disk interfaces directly with the TRANSMISSION HOUSING and the HOUSING II, forming a sealed assembly that maintains lubrication integrity.
Symptoms of Failure
- Delayed or harsh gear engagement — When the inner clutch disk wears thin, hydraulic pressure cannot build properly, causing noticeable lag or jerky shifts when moving from neutral to drive.
- Transmission slipping under load — A worn 0501.228.273 disk loses its friction coefficient, leading to RPM flare or power loss during acceleration, especially on inclines.
- Metallic debris in transmission fluid — Advanced wear generates fine metal particles from the friction material, often visible during oil changes or when inspecting the CYLINDRICAL PIN guides.
- Overheating and burnt fluid odor — Excessive slipping generates heat that degrades the transmission oil, producing a distinct burnt smell and darkening the fluid.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 0501.228.273 |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Thickness | 3.5 mm (new) |
| Friction Material | Sintered bronze on steel core |
| Weight | 0.45 kg |
| OEM Reference | ZF 0501.228.273 |
| Compatible Spline Count | 24 (estimated) |
Compatibility
This inner clutch disk is primarily designed for the ZF WG92 transmission, but it also fits the WG 90 Series, WG 94 Series, and WG 98 Series due to shared clutch pack dimensions. It is commonly used in ZF WG180, WG200, and WG250 models where the same 24-spline hub and friction plate stack are employed. Always verify the stack height and snap ring groove position when replacing the disk alongside the TYPE PLATE to confirm model identification. For complete assembly, ensure the TRANSMISSION HOUSING and HOUSING II are free of scoring before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Encloses the clutch pack and planetary gears |
| 4660301054 | HOUSING II | Supports the output shaft and valve body |
| 0631306174 | CYLINDRICAL PIN | Aligns housing sections during assembly |
| 0769123894 | TYPE PLATE | Identifies transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals oil passages in the valve body |
| 4660221029 | SUCTION TUBE | Draws oil from the pan to the pump |
| 0634100317 | O-RING | Prevents fluid leaks at housing joints |
| 0636103273 | CAP SCREW | Secures the clutch pack retaining plate |
| 0634306311 | O-RING | Seals the suction tube connection |
| 4660321029 | FIXING PLATE | Locks the clutch hub to the drum |
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