Overview
This ZF 2093.352.086 PISTON is a critical hydraulic actuation component engineered for the WG100, WG130, and WG131 transmission series. As an OEM genuine part, it converts hydraulic pressure into mechanical force to engage clutch packs and shift gears within the planetary gearset. The piston sits inside the transmission valve body and drum assembly, where its precise sealing and movement directly control oil flow to the friction plates. When paired with a properly functioning DIFFERENTIAL HOUSING, this piston ensures consistent torque delivery and smooth ratio changes. The SKU 2093.352.086 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit without modification.
Symptoms of Failure
- Delayed or harsh gear engagement — When the piston seal degrades, hydraulic pressure drops, causing a noticeable lag when shifting from Neutral to Drive or Reverse.
- Transmission fluid leaks from the bell housing — A cracked or worn piston allows ATF to bypass the seal, often pooling under the vehicle after extended operation.
- Slipping during acceleration under load — Insufficient piston stroke reduces clutch pack clamping force, leading to RPM flare without corresponding vehicle speed increase.
- Erratic shift patterns or gear hunting — Internal piston scoring disrupts oil metering, causing the transmission to randomly upshift or downshift on inclines.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2093.352.086 |
| Material | Hardened aluminum alloy with nitrile seal |
| Outer Diameter | 86 mm |
| Inner Diameter | 52 mm |
| Height | 28 mm |
| Weight | 0.34 kg |
| OEM Reference | ZF 2093.352.086 |
| Seal Type | Single-lip PTFE energized |
Compatibility
This piston is specifically designed for ZF WG-series powershift transmissions used in industrial and agricultural machinery. Verified compatible models include WG100, WG130, and WG131. It may also fit WG150 and WG160 variants where the clutch drum dimensions match. For differential-side components, always verify fitment with the DIFFERENTIAL assembly (part 5838109012) and the DIFFERENTIAL unit (part 2093209023). The piston works in conjunction with the TAPER ROLLER BEARING to manage axial loads during clutch engagement.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial shaft loads |
| 2093209023 | DIFFERENTIAL | Secondary torque split unit |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Retains piston return spring |
| 5838300811 | THRUST WASHER | Reduces axial friction in gear stack |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Drives wheel hubs |
| 5838300753 | THRUST WASHER | Controls end-play in planetary carrier |
| 5838300818 | THRUST WASHER | Separates rotating clutch drums |
Frequently Asked Questions
Q: Can I install this piston without replacing the seal ring?
A: No. The piston seal is integral to the part and cannot be serviced separately. Always install the complete 2093.352.086 unit to ensure proper hydraulic sealing.
Q: Will this piston work in a ZF WG180 transmission?
A: The WG180 uses a larger diameter piston (92 mm). This 2093.352.086 is designed for WG100/WG130/WG131 only. Check your transmission model tag before ordering.
Q: How do I verify the piston is seated correctly during rebuild?
A: After installation, manually rotate the clutch drum while applying low-pressure air (20 psi) to the piston feed port. A smooth, quiet rotation confirms proper seating.
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Phone: +86 158 2286 3467 |
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