Overview
The ZF 0501.212.880 SET OF SPRINGS is a precision-engineered component designed for the internal valve body and clutch pack assemblies within the WG100, WG130, and WG131 transmission series. This OEM genuine part provides the necessary preload and damping force to ensure smooth gear engagement and consistent hydraulic pressure regulation. The SKU 0501.212.880 is critical for maintaining the correct spring tension that controls shift timing and torque converter lockup. When rebuilding or servicing these heavy-duty transmissions, this spring set works in conjunction with the 4143101022 HOUSING and the 4143301044 HOUSING to create a sealed, pressurized environment for clutch actuation.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn springs cause inconsistent clutch pack clamping force, leading to a noticeable lag when shifting from neutral to drive or reverse.
- Transmission slipping under load: Reduced spring tension allows clutch plates to slip during acceleration, particularly in higher gears, resulting in RPM flare without corresponding speed increase.
- Erratic shift timing: Fatigue in the spring set disrupts hydraulic valve timing, causing early or late shifts that feel unpredictable or “hunting” between gears.
- Internal rattling or clicking noises: Broken or weakened springs can produce metallic sounds from the valve body area, especially at idle or low RPM.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.212.880 |
| Material | High-tensile spring steel (DIN 17223) |
| Wire Diameter | 3.2 mm |
| Outer Diameter | 28.5 mm |
| Free Length | 42.0 mm |
| Number of Springs per Set | 6 |
| Weight (set) | 0.12 kg |
| OEM Reference | ZF 0501.212.880 |
| Surface Treatment | Phosphate coated |
Compatibility
This spring set is engineered exclusively for ZF WG-series transmissions. It is a direct fit for the WG100, WG130, and WG131 models. While primarily designed for these three variants, it may also be compatible with the WG180 and WG200 series when used in specific valve body configurations. Always verify the spring pocket dimensions in your transmission before installation. The set is often replaced alongside the 0631329135 SPRING PIN and the 0636302014 SCREW PLUG during a full valve body overhaul.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101022 | HOUSING | Encloses clutch pack assembly |
| 4143301044 | HOUSING | Supports valve body alignment |
| 0631329135 | SPRING PIN | Secures spring set in bore |
| 0636302014 | SCREW PLUG | Seals hydraulic passages |
| 0634801057 | SEALING RING | Prevents fluid leakage |
| 4143301053 | CONNECTING PART | Links housing sections |
| 0636100600 | CAP SCREW | Fastens valve body covers |
| 0636101024 | CAP SCREW | Mounts transmission components |
| 0730365159 | TYPE PLATE | Identifies transmission model |
| 0631311009 | GROOVED STUD | Positions valve body parts |
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