Overview
The ZF 0730.063.145 RING is a precision-engineered OEM genuine component designed to maintain critical sealing and structural integrity within ZF heavy-duty transmission assemblies. This ring functions as a load-bearing and sealing interface, typically positioned between rotating shafts and stationary housings in the clutch or planetary gear sections. The SKU 0730.063.145 identifies a factory-specification part that prevents fluid bypass and ensures consistent hydraulic pressure across the transmission circuit. In construction machinery applications, this ring works in concert with the 4143101009 HOUSING and the 4143301025 HOUSING to create a sealed environment for high-torque power transfer.
Symptoms of Failure
- Hydraulic pressure loss during gear engagement — A worn 0730.063.145 ring allows pressurized oil to leak past its sealing surface, causing delayed or harsh shifting in ZF transmissions.
- External oil seepage near the housing joint — When the ring deforms or cracks, transmission fluid may weep from the seam between the 4143101009 HOUSING and adjacent components, leaving visible drips on the bell housing.
- Metallic debris in the oil pan — A fractured ring sheds fine metal particles into the lubrication system, often detected during routine oil analysis or filter inspection.
- Intermittent transmission overheating — Reduced sealing efficiency forces the hydraulic pump to work harder, generating excess heat that can trigger thermal warnings on construction equipment dashboards.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0730.063.145 |
| Type | Internal Sealing Ring |
| Outer Diameter | 63.5 mm |
| Inner Diameter | 55.0 mm |
| Thickness | 3.2 mm |
| Material | Nitril-Butadiene Rubber (NBR) with steel insert |
| Weight | 0.045 kg |
| OEM Reference | ZF 0730.063.145 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This ring is engineered for ZF powershift transmissions commonly found in wheel loaders, excavators, and telehandlers. It is a direct fit for the WG180, WG200, and WG210 series, as well as the 4WG-200 and 6WG-200 variants. The 0730.063.145 ring also appears in certain ZF Ergopower and ZF Ecomat models used in off-highway construction machinery. Always verify compatibility with your specific transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Encloses planetary gear set; provides mounting surface for sealing rings |
| 4143301025 | HOUSING | Rear transmission housing; supports output shaft bearings |
| 0634313603 | O-RING | Static seal for hydraulic passages between housing sections |
| 4475280018 | SCREW PLUG | Closes oil drain or pressure test ports in the transmission case |
| 0501342341 | SUPPORT RING | Backs up O-rings to prevent extrusion under high pressure |
| 4143298457 | SEAL KIT | Contains multiple seals and gaskets for transmission overhaul |
| 0634313591 | O-RING | Seals the clutch piston bore against fluid leakage |
| 0636101068 | CAP SCREW | Fastens housing halves together with precise torque rating |
| 4143221013 | THROTTLE VALVE | Modulates hydraulic flow for smooth clutch engagement |
| 0634304484 | O-RING | Seals the throttle valve bore in the valve body |
