Overview
The ZF 0501.326.667 CUP SPRING is a precision-engineered component designed for the internal clutch and brake assemblies of ZF WG100, WG130, and WG131 powershift transmissions. This OEM genuine part, identified by SKU 0501.326.667, provides the critical preload force required to maintain consistent pressure on piston return mechanisms and clutch pack clearances. Positioned within the rotating drum assembly, it ensures that the 2095109016 DIFFERENTIAL and related planetary gear sets operate with minimal axial play, directly influencing shift quality and torque transfer stability.
Symptoms of Failure
- Delayed or erratic gear engagement: A worn cup spring loses its calibrated tension, causing sluggish shifts or unexpected neutral conditions during operation.
- Low clutch pack pressure: If the spring fatigues, the clutch piston may not fully release, leading to dragging clutches and elevated transmission oil temperatures.
- Metallic rattling noise from the bell housing: A broken or collapsed cup spring allows loose components to vibrate, producing a distinct rattle that worsens under load.
- Oil contamination from debris: Fractured spring fragments can circulate through the hydraulic system, damaging the 0750117075 TAPER ROLLER BEARING and other precision surfaces.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.326.667 |
| Material | Spring steel (DIN 17222), oil-tempered |
| Outer Diameter | 68.5 mm |
| Inner Diameter | 42.0 mm |
| Free Height | 12.8 mm |
| Load at Working Height | 1,850 N ± 5% |
| Weight | 0.045 kg |
| OEM Reference | ZF 0501.326.667 |
Compatibility
This cup spring is engineered specifically for ZF WG-series powershift transmissions. It is a direct fit for the WG100, WG130, and WG131 models, commonly found in agricultural tractors and construction loaders. The part also supports the 2095209037 DIFFERENTIAL assembly in WG180 and WG200 variants when used as a preload element in the clutch drum. Always verify your transmission serial number against the OEM parts catalog before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2095109016 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on shafts |
| 2095209037 | DIFFERENTIAL | Rear differential assembly for WG130 |
| 2095309059 | DIFF.HOUSING | Encloses differential gear set |
| 0631329086 | SPRING PIN | Retains cup spring in clutch drum |
| 0730300820 | THRUST WASHER | Reduces axial friction between rotating parts |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 2095309081 | DIFFERENTIAL AXLE | Connects differential to wheel hubs |
| 5838300811 | THRUST WASHER | Controls end-play in planetary gears |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Primary gear in differential carrier |
