Overview
The ZF 0501.326.725 涡轮轴活塞环 is a critical sealing component engineered for the high-pressure hydraulic circuits within ZF heavy-duty powershift transmissions. This genuine OEM part, identified by SKU 0501.326.725, sits directly on the turbine shaft assembly, functioning as a dynamic seal between the rotating shaft and the stationary housing. Its primary role is to direct pressurized oil flow to the torque converter and clutch packs, ensuring precise engagement and disengagement. Without this ring, the transmission cannot maintain the necessary hydraulic pressure for power transfer, making it a vital element in construction machinery drivetrains.
Symptoms of Failure
When the ZF 0501.326.725 涡轮轴活塞环 wears or cracks, it directly compromises hydraulic integrity. Watch for these specific failure indicators:
- Erratic gear engagement or slipping: A worn ring allows oil to bypass the turbine shaft, causing delayed or incomplete clutch pack engagement under load.
- Torque converter shudder: Loss of sealing pressure leads to inconsistent converter lock-up, resulting in vibration during acceleration or uphill operation.
- External oil seepage near the bell housing: Pressurized fluid escaping past the damaged ring often pools at the transmission-to-engine interface, leaving visible drips.
- Overheating transmission fluid: Reduced hydraulic efficiency forces the system to work harder, generating excess heat that degrades oil quality and accelerates wear.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 0501.326.725 |
| Component Type | Turbine Shaft Piston Ring |
| Material | High-Carbon Steel with Phosphate Coating |
| Outer Diameter (Approx.) | 72.5 mm |
| Cross-Section Width | 3.2 mm |
| Weight | 18 grams |
| OEM Reference | ZF 0501.326.725 (Genuine) |
| Hardness Rating | HRC 45-50 |
Compatibility
This genuine ZF 0501.326.725 涡轮轴活塞环 is designed for integration into specific ZF powershift transmission models commonly found in wheel loaders, graders, and dozers. Based on its turbine shaft application, it is compatible with the following series:
- ZF WG180 – All variants (WG180, WG180/II)
- ZF WG200 – Including WG200/II and WG200/III
- ZF 4WG-200 – 4-speed versions
- ZF 6WG-200 – 6-speed heavy-duty models
- ZF Ergopower – Select models using turbine shaft piston ring design
Always verify your transmission serial number against the OEM parts catalog before installation. This ring is not interchangeable with standard oil rings; it is specifically machined for the turbine shaft groove.
