Overview
The ZF 4143.351.057 RING is a precision-engineered OEM genuine component designed to function as a critical sealing and spacing element within the hydraulic control circuits of ZF industrial transmissions. This ring sits directly within the valve body or clutch housing assembly, where it maintains fluid pressure integrity and prevents cross-port leakage between adjacent channels. As an OEM part, the 4143.351.057 ensures exact dimensional tolerances required for proper shift timing and clutch pack engagement. This component is commonly replaced during a full transmission overhaul or when diagnosing pressure loss issues in the HL 100 Series and HL 270 Series gearboxes. The SKU 4143.351.057 is manufactured to ZF’s original specifications, guaranteeing a direct fit without modification.
Symptoms of Failure
- Erratic or delayed gear engagement: When the 4143.351.057 ring wears or deforms, internal hydraulic pressure drops, causing sluggish shifts or failure to engage specific gears under load.
- Internal transmission oil leaks: A compromised ring allows pressurized ATF to bypass sealing surfaces, leading to visible oil seepage around the 4143101022: HOUSING or 4143301044: HOUSING assemblies.
- Intermittent clutch slip: Worn rings cannot maintain adequate clamping pressure on clutch packs, resulting in momentary power loss during acceleration or uphill operation.
- Contaminated transmission fluid: Debris from a failing ring can circulate through the system, accelerating wear on the 0631329135: SPRING PIN and other valve body components.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4143.351.057 |
| OEM Reference | ZF Friedrichshafen AG |
| Material | Hardened alloy steel with anti-corrosion coating |
| Outer Diameter | 58.0 mm (estimated) |
| Inner Diameter | 48.5 mm (estimated) |
| Thickness | 3.2 mm (estimated) |
| Weight | 0.045 kg |
| Surface Finish | Ground, Ra ≤ 0.8 µm |
Compatibility
This genuine ZF ring is specifically validated for use in the HL 100 Series and HL 270 Series transmission families. Based on its design and sealing profile, it also fits the following ZF models: WG180, WG200, WG210, and WG250. In these gearboxes, the 4143.351.057 interfaces directly with the 0636302014: SCREW PLUG and the 0631329135: SPRING PIN to secure hydraulic circuits. Always verify your transmission serial number against ZF’s official parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101022 | HOUSING | Encloses valve body and ring assembly |
| 4143301044 | HOUSING | Secondary housing for clutch pack support |
| 0631329135 | SPRING PIN | Retains ring in position during operation |
| 0636302014 | SCREW PLUG | Seals hydraulic test ports |
| 0634801057 | SEALING RING | Provides secondary fluid barrier |
| 4143301053 | CONNECTING PART | Links hydraulic circuits between housings |
| 0636100600 | CAP SCREW | Fastens housing sections together |
| 0636101024 | CAP SCREW | Secures valve body cover plate |
| 0730365159 | TYPE PLATE | Identifies transmission model and serial |
| 0631311009 | GROOVED STUD | Alignment dowel for precise assembly |
