Overview
The ZF 0730.062.718 RING is a precision-engineered retaining component designed for the WG180 series heavy-duty transmission. This OEM genuine part functions as a critical axial retention element, securing internal gear assemblies and shaft components within the transmission housing. Positioned directly against the planetary gear sets, the ring prevents unwanted lateral movement that could lead to misalignment under high-torque conditions. The SKU 0730.062.718 is manufactured to ZF’s exacting tolerances, ensuring a snug fit that maintains gear mesh integrity during continuous operation. When installed alongside the TRANSMISSION HOUSING, this ring forms a sealed boundary that protects internal components from contamination.
Symptoms of Failure
- Transmission oil leaks at the housing interface — A worn or deformed 0730.062.718 ring can cause pressurized fluid to escape past the seal, leading to visible drips near the bell housing or output flange.
- Intermittent gear slipping under load — When the ring loses its dimensional stability, axial play develops in the gear train, causing momentary disengagement during acceleration or hill climbs.
- Unusual metallic grinding noises — A fatigued ring allows gear teeth to contact the HOUSING surface, producing a distinct scraping sound that intensifies with RPM.
- Erratic shift timing — The ring’s failure to maintain proper clearances can confuse the shift logic, resulting in delayed or harsh gear changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0730.062.718 |
| Material | Nitrided steel (DIN 1.8519 equivalent) |
| Outer Diameter | 142.5 mm |
| Inner Diameter | 128.0 mm |
| Thickness | 3.2 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 0730.062.718 |
| Surface Hardness | HRC 58-62 |
Compatibility
This ring is primarily specified for the ZF WG180 series, including WG180, WG180C, and WG180E variants. It also fits select WG200 models where the planetary carrier assembly shares identical dimensions. The part is not compatible with WG120 or WG150 series due to different shaft diameters. Always verify fitment by cross-referencing the TYPE PLATE affixed to your transmission housing. For secure installation, use the GROOVED STUD to anchor the ring during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101080 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301333 | HOUSING | Secondary housing for valve body |
| 0730365125 | TYPE PLATE | Identification plate with model specs |
| 0631311009 | GROOVED STUD | Alignment pin for ring installation |
| 0636305019 | SCREW PLUG | Seals oil passages in housing |
| 4644301247 | THREADED BUSH | Reinforced insert for bolt threads |
| 0634303485 | O-RING | Hydraulic seal for pressure circuits |
| 4644106055 | SHIFT SYSTEM | Actuator assembly for gear selection |
| 4642306050 | COVER PLATE | Access cover for inspection port |
| 4644306464 | GASKET | Sealing layer between mating surfaces |
