Overview
The ZF 0501.323.210 SPRING CUP is a precision-engineered retention component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part functions as a critical load-bearing seat for the clutch return spring assembly, ensuring consistent spring alignment and preload within the hydraulic actuation system. Positioned directly inside the 4663101001: HOUSING, the spring cup prevents axial movement of the spring pack during gear shifts, maintaining proper clutch pack clearance. The SKU 0501.323.210 is manufactured to ZF’s original tolerances, guaranteeing a secure fit that eliminates vibration-induced wear over extended service intervals.
Symptoms of Failure
- Delayed or erratic gear engagement: A worn spring cup allows the return spring to shift off-center, causing inconsistent clutch release timing and harsh shifting.
- Audible clicking or rattling from transmission housing: When the cup loses its structural integrity, the spring can oscillate against the 4663301025: COVER, producing metallic noise during idle or low-speed operation.
- Reduced clutch pack clamping force: Cracks in the spring cup reduce preload, leading to clutch slippage under load and eventual overheating of the friction discs.
- Oil contamination from metal debris: Fractured spring cup fragments circulate through the hydraulic system, damaging seals and the 0631306816: CYLINDRICAL PIN guide surfaces.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.323.210 |
| Material | Case-hardened steel (DIN 1.7131) |
| Outer Diameter | 38.0 mm |
| Inner Diameter | 28.5 mm |
| Height | 12.7 mm |
| Wall Thickness | 4.75 mm |
| Weight | 0.045 kg |
| Surface Treatment | Zinc-phosphate coated |
| OEM Reference | ZF 0501.323.210 |
| Hardness | HRC 45-50 |
Compatibility
This spring cup is engineered specifically for ZF WG-series transmissions with hydraulic clutch actuation. Verified compatible models include WG100, WG130, and WG131. It also fits select variants of the WG180 and WG200 series when used with the corresponding 0636100817: CAP SCREW kit. Always verify the spring cup’s inner diameter against your existing spring coil diameter before installation. For heavy-duty applications, pairing this part with a new 4656301148: FIXING PLATE is recommended to distribute clamping forces evenly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4663101001 | HOUSING | Encloses the clutch spring assembly and aligns the spring cup |
| 4663301025 | COVER | Seals the housing and provides a bearing surface for the spring cup |
| 0631306816 | CYLINDRICAL PIN | Guides the spring cup during axial compression |
| 0636100817 | CAP SCREW | Secures the cover to the housing |
| 4656301148 | FIXING PLATE | Distributes spring load across the cup surface |
| 0636611009 | STUD | Positions the fixing plate relative to the housing |
| 0634303928 | O-RING | Seals the cover-to-housing interface |
| 4475280099 | SCREW PLUG | Closes hydraulic test ports in the housing |
| 0634303266 | O-RING | Seals the screw plug |
| 4475280018 | SCREW PLUG | Alternate port plug for WG131 variants |
