Overview
The ZF 2095.268.012 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 valve body and clutch drum assembly, the piston creates a sealed chamber that, when pressurized, moves to compress friction discs. The SKU 2095.268.012 is precision-machined to ZF’s exacting tolerances, ensuring consistent shift quality and preventing internal cross-leakage. When paired with a properly functioning DIFFERENTIAL HOUSING, this piston maintains the hydraulic integrity required for smooth power delivery.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn piston seal allows hydraulic fluid to bypass, causing a noticeable lag when shifting from Neutral to Drive or Reverse.
- Internal transmission oil leaks: Cracks in the piston body or degraded sealing rings lead to low line pressure, often visible as fluid pooling inside the bell housing.
- Slipping clutches under load: Insufficient piston stroke prevents full clutch pack compression, resulting in RPM flare during acceleration.
- Erratic shift patterns: A sticking piston can cause intermittent pressure loss, making the transmission hunt for gears or skip shifts entirely.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 2095.268.012 |
| Material | Hardened Aluminum Alloy with Nitrile Seal |
| Outer Diameter | 68.5 mm |
| Inner Diameter | 42.0 mm |
| Height | 22.3 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 2095.268.012 |
| Operating Pressure | 8–15 bar |
Compatibility
This piston is specifically designed for the ZF WG100, WG130, and WG131 off-highway transmissions. It is also compatible with certain variants of the WG180 and WG200 series that share the same clutch drum geometry. Always verify the piston bore diameter against your transmission’s valve body. For a complete rebuild, consider replacing the DIFFERENTIAL and TAPER ROLLER BEARING to eliminate play in the output shaft. The DIFFERENTIAL unit in the rear axle also benefits from a fresh piston to maintain balanced hydraulic flow.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on shafts |
| 2093209023 | DIFFERENTIAL | Secondary torque distribution unit |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and protects differential gears |
| 0631329088 | SPRING PIN | Secures piston return spring alignment |
| 5838300811 | THRUST WASHER | Reduces axial friction between rotating parts |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to the axle shaft |
| 5838300633 | AXLE | Transmits rotational force to wheels |
| 5838300753 | THRUST WASHER | Controls end-play in gear sets |
| 5838300818 | THRUST WASHER | Additional axial load distribution |
Frequently Asked Questions
Q: Can the 2095.268.012 piston be reused after a rebuild?
A: ZF recommends replacing this piston during any major overhaul because the sealing lip deforms permanently under pressure. Reuse often leads to premature internal leakage.
Q: What tools are needed to install this piston?
A: A piston seal installer tool and a torque wrench calibrated to 25 Nm are required. The piston must be lubricated with ATF before insertion to avoid seal damage.
Q: Does this piston fit the ZF WG180 transmission?
A: Yes, but only in WG180 units with the updated clutch drum (serial numbers after 2015). Earlier models use a different piston diameter. Always cross-reference your drum bore.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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