Overview
The ZF 0501.221.326 LINED CLUTCH DISK is a critical friction component engineered for the WG100, WG130, and WG131 powershift transmissions. This OEM genuine part transfers torque from the engine to the gear train by engaging and disengaging the clutch pack under hydraulic pressure. Positioned within the clutch drum assembly, the lined disk ensures smooth power delivery during gear shifts and load changes. The SKU 0501.221.326 is precision-machined to ZF’s exacting tolerances, providing consistent friction characteristics and long service life in heavy-duty industrial applications.
Symptoms of Failure
- Transmission gear slipping under load: When the friction lining wears thin, the clutch disk fails to hold torque, causing the transmission to slip during acceleration or when climbing grades.
- Delayed or harsh shifting: A worn 0501.221.326 disk can cause erratic engagement, leading to jarring gear changes or hesitation between forward and reverse.
- Burnt clutch smell or dark transmission fluid: Excessive heat from friction material degradation produces a distinct burnt odor and discolors the hydraulic oil, indicating imminent disk failure.
- Reduced power transfer efficiency: Operators may notice a drop in machine performance, with the engine revving higher than normal for a given ground speed.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.221.326 |
| Type | Lined Clutch Disk (Friction Plate) |
| Outer Diameter | ~180 mm (estimated) |
| Inner Diameter | ~120 mm (estimated) |
| Thickness | ~3.5 mm (new) |
| Friction Material | High-carbon paper-based lining |
| Core Material | Steel with splined inner hub |
| Weight | ~0.45 kg |
| OEM Reference | ZF 0501.221.326 |
Compatibility
This lined clutch disk is designed for ZF WG series powershift transmissions, specifically the WG100, WG130, and WG131 models. It is also compatible with select variants of the WG180 and WG200 series when used in the same clutch pack configuration. Always verify the clutch pack stack height and spline count against your transmission’s service manual. The 0501.221.326 disk works in conjunction with the 2093109018 DIFFERENTIAL and the 0750117075 TAPER ROLLER BEARING to maintain driveline alignment. For complete rebuilds, pair this disk with the 2093209023 DIFFERENTIAL and the 5838300626 DIFFERENTIAL HOUSING to ensure optimal gear mesh and load distribution.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109018 | DIFFERENTIAL | Distributes torque between drive axles |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating shafts under axial/radial loads |
| 2093209023 | DIFFERENTIAL | Secondary differential for multi-axle drive |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Secures clutch pack components |
| 5838300811 | THRUST WASHER | Reduces axial friction in gear sets |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 5838300633 | AXLE | Connects differential to wheel ends |
| 5838300753 | THRUST WASHER | Controls end-play in planetary gears |
| 5838300818 | THRUST WASHER | Prevents metal-to-metal contact in clutch packs |
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