Overview
The ZF 4143.352.023 PISTON is a critical hydraulic actuation component engineered for the HL 100 and HL 270 series transmissions. This OEM genuine part converts hydraulic pressure into mechanical force to engage clutch packs and shift gears. Positioned within the valve body assembly, the piston slides inside a precision-bored 4143101016: HOUSING to direct oil flow. The SKU 4143.352.023 is manufactured to ZF’s exacting tolerances, ensuring consistent sealing and pressure response in heavy-duty industrial applications.
Symptoms of Failure
- Delayed gear engagement — A worn piston causes sluggish shifts, especially when cold, as hydraulic pressure bleeds past the sealing surface.
- Intermittent clutch slip — When the piston cannot maintain full stroke, clutches fail to lock, leading to power loss under load.
- External oil seepage — Cracks or scoring on the piston face allow transmission fluid to escape past the 0501318136: GASKET and 0636101084: CAP SCREW mounting points.
- Erratic shift quality — Hard or flared shifts occur when the piston sticks in its bore due to debris or corrosion.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4143.352.023 |
| Material | Hardened alloy steel with phosphate coating |
| Outer Diameter | 52.0 mm |
| Inner Diameter | 28.5 mm |
| Height | 34.2 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 4143.352.023 |
| Seal Type | Integral PTFE lip seal |
| Operating Pressure | 12–18 bar |
Compatibility
This piston is designed for ZF HL 100 and HL 270 series transmissions, commonly found in forklifts, telehandlers, and construction loaders. It also fits select WG180 and WG200 models when used with the correct 4143301039: HOUSING adapter. Always verify your transmission serial number before ordering. The 4143.352.023 piston is not backward-compatible with earlier HL 75 series units without a full valve body upgrade.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101016 | HOUSING | Bore housing for piston assembly |
| 4143301039 | HOUSING | Secondary housing for valve body |
| 0501318136 | GASKET | Seals piston housing interface |
| 0636101084 | CAP SCREW | Fastens piston retaining plate |
| 0750108044 | PLUG | Closes hydraulic test port |
| 0636302014 | SCREW PLUG | Seals drain passage |
| 0634801057 | SEALING RING | Prevents fluid bypass at plug |
| 0730365092 | TYPE PLATE | Identification label for assembly |
| 4143201019 | VALVE INSERT | Regulates pilot pressure to piston |
| 0634306198 | O-RING | Seals valve insert bore |
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