Overview
The ZF 0501.314.827 COMPRESSION SPRING is an OEM genuine component engineered for precise force application within the valve body and clutch pack assemblies of ZF WG-series transmissions. This spring, identified by SKU 0501.314.827, provides the necessary return pressure to maintain proper hydraulic circuit timing and gear engagement. It sits directly within the piston housing, working in concert with the 0501209497: PISTON to regulate oil flow during shifts. Without this spring, the transmission cannot maintain consistent clamping force on clutch plates, leading to drivability issues.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn compression spring fails to return the piston quickly, causing a noticeable lag when shifting from Park to Drive or between forward gears.
- Intermittent clutch slip under load: When the spring loses its tension, the clutch pack cannot hold full torque, resulting in RPM flare during acceleration.
- Low hydraulic pressure codes: The ECM may log pressure-related fault codes (e.g., P0740, P0841) as the spring fails to maintain proper valve body backpressure.
- Transmission overheating: Slipping clutches generate excess heat; a fatigued spring is a common root cause in WG100 and WG130 units.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.314.827 |
| Material | Chrome-silicon alloy steel (DIN 17223) |
| Wire Diameter | 3.5 mm |
| Outer Diameter | 28.0 mm |
| Free Length | 45.0 mm |
| Spring Rate | 22.5 N/mm |
| Weight | 0.04 kg |
| OEM Reference | ZF 0501.314.827 |
Compatibility
This compression spring is specifically designed for the ZF WG100, WG130, and WG131 transmission series. It is also compatible with select variants of the WG180 and WG200 models where the valve body uses the same piston bore dimensions. Always verify the spring free length against your existing part before installation. The spring interfaces directly with the 4108101140: HOUSING and the 0501314793: COVER to form a sealed pressure chamber. For complete assembly, pair this spring with the 0501211694: MOTOR and the 0501314799: BUSH to ensure proper alignment and wear resistance.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101140 | HOUSING | Encloses the spring and piston assembly |
| 0501211694 | MOTOR | Hydraulic control motor for valve body actuation |
| 0501314793 | COVER | Seals the spring chamber against fluid loss |
| 0501314799 | BUSH | Guides the spring and reduces lateral wear |
| 0735370299 | TAPERED ROLLER BEARING | Supports rotating shafts within the gearset |
| 0501317874 | HOUSING | Secondary housing for clutch pack retention |
| 0501317875 | ROLLER | Reduces friction in the shift mechanism |
| 0501209497 | PISTON | Directly actuated by the compression spring |
| 0501317876 | COMPRESSION SPRING | Similar spring used in adjacent clutch packs |
| 0501314823 | BUSH | Wear sleeve for the spring guide bore |
