Overview
The ZF 2095.353.013 PISTON is a critical hydraulic actuation component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part converts hydraulic pressure into mechanical force to engage clutch packs and shift gears within the planetary gearset. Positioned inside the clutch drum assembly, the piston creates a sealed chamber that, when pressurized, applies clamping force to the friction discs. The SKU 2095.353.013 is precision-machined to OEM tolerances to ensure consistent shift timing and prevent internal cross-leakage. For optimal drivetrain performance, this piston works in concert with the 5838109021 DIFFERENTIAL to distribute torque smoothly across the output shafts.
Symptoms of Failure
- Delayed or harsh shifting: A worn piston seal allows hydraulic fluid to bypass, causing sluggish engagement or abrupt gear changes, especially under load.
- Internal transmission oil leaks: Cracks or scoring on the piston bore lead to fluid migration into the clutch housing, visible as low oil levels or puddling under the bell housing.
- Slipping in forward or reverse gears: Insufficient clamping force from a degraded piston results in clutch pack slippage, often accompanied by a burning smell from overheated friction material.
- Erratic neutral-to-drive engagement: Air entrapment from a failing piston causes a noticeable lag or “flare” when shifting from park to drive.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2095.353.013 |
| Material | Hard-anodized aluminum alloy (6061-T6) |
| Outer Diameter | 152.4 mm (6.00 in) |
| Inner Diameter | 88.9 mm (3.50 in) |
| Height | 34.5 mm (1.36 in) |
| Weight | 0.42 kg (0.93 lb) |
| OEM Reference | ZF 2095.353.013 |
| Seal Type | PTFE lip seal (pre-installed) |
Compatibility
This piston is designed for ZF WG-series powershift transmissions used in off-highway and industrial equipment. Confirmed compatible models include WG100, WG130, and WG131. It may also fit earlier variants of the WG180 and WG200 series when used with the correct clutch drum assembly. Always verify piston bore diameter and snap ring groove position against your transmission’s service manual. For differential-side support, pair this piston with the 2095209019 DIFFERENTIAL and the 0750117075 TAPER ROLLER BEARING to maintain axial alignment. Secure the assembly using the 0631329086 SPRING PIN for positive retention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109021 | DIFFERENTIAL | Distributes torque between output shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on shaft |
| 2095209019 | DIFFERENTIAL | Secondary torque distribution unit |
| 0631329086 | SPRING PIN | Locks piston to clutch drum hub |
| 5838300817 | THRUST WASHER | Reduces axial friction in gear train |
| 5838300682 | DIFFERENTIAL AXLE | Carries differential spider gears |
| 5838300811 | THRUST WASHER | Spacer for planetary gearset |
| 5841302064 | THRUST WASHER | High-load axial bearing surface |
| 5838300812 | SEALING RING | Prevents fluid bypass at piston bore |
| 5838300137 | OUTER CLUTCH DISK | Friction surface for clutch engagement |
