Overview
The ZF 0501.325.293 SPRING CUP is a precision-engineered component designed for the clutch pack assembly within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part provides the critical preload tension necessary for proper clutch engagement and disengagement. Positioned directly within the piston housing, the spring cup ensures consistent force distribution across the return springs. The SKU 0501.325.293 is manufactured to ZF’s exacting tolerances, guaranteeing a secure fit against the 4663101001: HOUSING and the 4663301025: COVER assembly. Without this cup, the spring pack cannot maintain correct axial alignment, leading to premature wear of adjacent components.
Symptoms of Failure
- Delayed or harsh gear engagement: When the spring cup fatigues, clutch pack preload drops, causing noticeable hesitation or jarring shifts, especially in WG130 units.
- Intermittent oil pressure loss: A deformed cup can allow the return springs to shift, obstructing oil flow passages and triggering low-pressure warnings on the transmission control module.
- Metallic rattling from the bell housing: A broken or cracked spring cup permits spring movement against the 0631306816: CYLINDRICAL PIN, producing a distinct rattle during idle or coasting.
- Gradual clutch slippage under load: Worn cups reduce clamping force, causing the clutch pack to slip during acceleration, often misdiagnosed as a solenoid issue.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.325.293 |
| Material | Spring steel (C67S) with phosphate coating |
| Outer Diameter | 38.5 mm |
| Inner Diameter | 28.0 mm |
| Height | 12.2 mm |
| Weight | 18 grams |
| OEM Reference | ZF 0501.325.293 |
| Hardness | HRC 44-48 |
Compatibility
This spring cup is specifically engineered for ZF WG100, WG130, and WG131 series transmissions. It is also compatible with select WG180 and WG200 variants that share the same clutch pack architecture. Always verify the 0636100817: CAP SCREW torque specifications when reinstalling the cover. For complete assembly integrity, pair this cup with the 4656301148: FIXING PLATE and 0636611009: STUD to ensure proper retention. The cup also seals against the 0634303928: O-RING to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4663101001 | HOUSING | Encloses clutch pack and spring assembly |
| 4663301025 | COVER | Seals the housing and retains spring cup |
| 0631306816 | CYLINDRICAL PIN | Aligns spring cup and prevents rotation |
| 0636100817 | CAP SCREW | Secures cover to housing |
| 4656301148 | FIXING PLATE | Locks spring cup in position |
| 0636611009 | STUD | Provides threaded mounting for cover |
| 0634303928 | O-RING | Seals between housing and cover |
| 4475280099 | SCREW PLUG | Closes oil passage ports |
| 0634303266 | O-RING | Seals screw plug |
| 4475280018 | SCREW PLUG | Alternate port plug for WG131 |
