Overview
The ZF 2095.310.038 PISTON is a critical hydraulic actuation component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part functions as the primary force-translating element within the clutch or brake piston assembly, converting hydraulic pressure into linear mechanical motion to engage gear sets. Positioned inside the transmission’s valve body or clutch drum, the SKU 2095.310.038 ensures precise oil flow control and consistent clamping force. When paired with a 2095109020: DIFFERENTIAL or a 2095209037: DIFFERENTIAL, this piston maintains the integrity of the driveline’s torque distribution.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn piston seal causes internal pressure loss, leading to sluggish shifts or abrupt clutch application.
- Transmission fluid leaks near the clutch housing: Cracks or scoring on the piston surface allow ATF to bypass, visible as drips or wet spots around the bell housing.
- Intermittent gear slipping under load: When the piston cannot hold steady pressure, the transmission may momentarily lose drive in higher gears, especially during uphill climbs.
- Erratic shift timing: A failing piston disrupts the hydraulic balance, causing the transmission to shift too early or too late relative to engine RPM.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (OEM) | 2095.310.038 |
| Material | High-strength aluminum alloy with anodized surface |
| Outer Diameter | 85.0 mm (estimated) |
| Inner Diameter | 45.0 mm (estimated) |
| Height | 32.5 mm (estimated) |
| Weight | 0.28 kg (0.62 lbs) |
| OEM Reference | ZF 2095.310.038 |
| Seal Type | Integrated PTFE lip seal |
Compatibility
This piston is specifically designed for ZF’s WG-series powershift transmissions. It is a direct fit for the WG100, WG130, and WG131 models. Based on its hydraulic circuit design, it may also be compatible with the WG180 and WG200 series when used in the same clutch pack configuration. Always verify the piston’s outer diameter and seal groove dimensions against your transmission’s service manual. For complete differential assembly, consider the 2095309059: DIFF.HOUSING and the 0750117075: TAPER ROLLER BEARING which support the output shaft adjacent to this piston.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2095109020 | DIFFERENTIAL | Distributes torque between axles |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on shaft |
| 2095209037 | DIFFERENTIAL | Secondary torque distribution unit |
| 2095309059 | DIFF.HOUSING | Encloses differential gears |
| 0631329086 | SPRING PIN | Retains piston alignment |
| 0730300820 | THRUST WASHER | Reduces axial friction |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel axles |
| 2095309081 | DIFFERENTIAL AXLE | Connects differential to wheel hubs |
| 5838300811 | THRUST WASHER | Secondary axial load bearing |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Meshes with axle bevel gear |
