Overview
The ZF 0730.063.029 RING is an OEM genuine sealing component engineered for high-stress environments within ZF construction machinery transmissions. This precision-machined ring sits between the rotating shaft and the stationary housing, forming a critical barrier that maintains hydraulic pressure and prevents fluid migration. As a factory-specified part, the SKU 0730.063.029 ensures exact dimensional tolerances required for reliable clutch pack engagement and torque converter operation. When installed correctly, this ring works in concert with the 4143101009: HOUSING and the 4143301025: HOUSING to create a sealed pressure cavity essential for smooth gear shifts.
Symptoms of Failure
When the ZF 0730.063.029 RING wears beyond service limits, operators will notice distinct performance degradation. Hydraulic pressure loss during cold starts is a primary indicator, as the worn ring cannot maintain seal integrity until the transmission fluid warms and thickens. Intermittent gear slippage under load occurs when the ring fails to hold pressure in the clutch apply circuit, particularly when climbing grades or carrying heavy payloads. External oil seepage around the housing joint becomes visible as the compromised ring allows pressurized fluid to bypass the 0634313603: O-RING and escape through the 4475280018: SCREW PLUG interface. Erratic shift timing often accompanies these symptoms, as the transmission control module compensates for inconsistent hydraulic feedback.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0730.063.029 |
| Material | Nitrile rubber (NBR) with steel reinforcement |
| Inner Diameter | 63.0 mm |
| Outer Diameter | 73.0 mm |
| Cross-Section Thickness | 5.0 mm |
| Weight | 0.018 kg |
| OEM Reference | ZF 0730.063.029 |
| Operating Temperature Range | -40°C to +120°C |
| Hardness (Shore A) | 70 ± 5 |
Compatibility
This sealing ring is designed for ZF power shift transmissions commonly used in construction machinery. It is a direct replacement part for the WG180, WG200, and WG210 series transmissions. These models are found in wheel loaders, telehandlers, and excavators from manufacturers such as Liebherr, Caterpillar, and Volvo. The ring also fits select ZF 4WG-200 and ZF 6WG-200 variants where the hydraulic control valve body interfaces with the main housing. Always verify the part number against your transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Encloses the valve body and directs hydraulic flow |
| 4143301025 | HOUSING | Supports the clutch pack and torque converter assembly |
| 0634313603 | O-RING | Seals the housing-to-cover interface |
| 4475280018 | SCREW PLUG | Closes hydraulic test ports and drain passages |
| 0501342341 | SUPPORT RING | Prevents extrusion of the O-ring under high pressure |
| 4143298457 | SEAL KIT | Complete set of seals for transmission overhaul |
| 0634313591 | O-RING | Seals the piston bore in the clutch housing |
| 0636101068 | CAP SCREW | Fastens the valve body to the transmission case |
| 4143221013 | THROTTLE VALVE | Modulates hydraulic pressure for shift quality |
| 0634304484 | O-RING | Seals the throttle valve bore in the control housing |
