Overview
The ZF 0501.228.272 Inner Clutch Disk is a critical friction component engineered for the WG90 and WG94 series transmissions. This OEM genuine part resides within the clutch pack assembly, where it transmits torque between rotating elements during gear engagement. Its primary function is to provide smooth, reliable power transfer while withstanding high thermal loads and hydraulic pressure. The SKU 0501.228.272 is precision-machined to ZF’s exacting tolerances, ensuring consistent clamping force and minimal drag in the oil bath. When installed alongside the 4661101001: TRANSMISSION HOUSING, this disk forms the core of the shifting mechanism, directly influencing shift quality and overall drivetrain efficiency.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn inner clutch disk causes hesitation when shifting from neutral to drive or reverse, often accompanied by a noticeable jolt.
- Transmission slipping under load: As friction material degrades, the disk fails to hold torque, resulting in engine RPM spikes without corresponding acceleration—especially on inclines.
- Burning smell or dark transmission fluid: Excessive heat from slipping generates a burnt odor, and the fluid may appear discolored or contain metallic particles from the worn disk.
- Intermittent loss of drive in specific gears: The 0501.228.272 failure can cause partial or complete torque loss in forward or reverse, often misdiagnosed as a valve body issue.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.228.272 |
| Type | Inner Clutch Disk (Friction Plate) |
| Outer Diameter | 228 mm (estimated) |
| Inner Diameter | 172 mm (estimated) |
| Thickness | 2.5 mm (new, nominal) |
| Material | Steel core with sintered bronze friction lining |
| Weight | 0.45 kg (approx.) |
| OEM Reference | ZF 0501.228.272 |
| Application | Oil-cooled clutch pack |
Compatibility
This genuine ZF inner clutch disk is designed primarily for the WG90 and WG94 transmission series. It also fits select variants within the WG180 and WG200 families where the clutch pack diameter and spline count match. Always verify the spline profile and stack height before installation. The disk works in conjunction with the 4661301007: HOUSING and the 4661301093: TUBE to maintain proper oil flow and alignment. Additionally, the 0631306174: CYLINDRICAL PIN is used to secure the clutch pack assembly, preventing rotation of the disks during operation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101001 | TRANSMISSION HOUSING | Encloses and supports the clutch pack assembly |
| 4661301007 | HOUSING | Provides mounting surface for clutch components |
| 4661301093 | TUBE | Directs hydraulic fluid to the clutch piston |
| 0631306174 | CYLINDRICAL PIN | Aligns and secures clutch pack elements |
| 0769123894 | TYPE PLATE | Identifies transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic passages in the housing |
| 0636302602 | SCREW PLUG | Closes oil drain or test ports |
| 0634100633 | O-RING | Prevents fluid leaks between mating surfaces |
| 4661301029 | NOZZLE | Sprays cooling oil onto clutch disks |
| 4661301027 | NOZZLE | Provides targeted lubrication to clutch pack |
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