Overview
The ZF 0730.103.773 WASHER is a precision-engineered OEM genuine component specifically designed for the WG 100 series transmission. This hardened steel washer functions as a critical load-spreading and axial positioning element within the gear train assembly, ensuring correct clearance between rotating shafts and stationary housings. Installed directly against the TRANSMISSION HOUSING, it prevents metal-on-metal contact and maintains proper preload on bearing assemblies. The SKU 0730.103.773 is manufactured to ZF’s exacting tolerances, guaranteeing a service life that matches the transmission’s overhaul interval. Without this washer, internal clearances shift, leading to accelerated wear on adjacent components such as the HOUSING and planetary gear sets.
Symptoms of Failure
- Transmission oil seepage at the housing joint – A worn 0730.103.773 washer allows the O-RING seal to lose compression, causing fluid to weep from the mating surface between the housing and cover.
- Abnormal gear whine or rumbling noise – When the washer thickness degrades, axial play increases in the shaft, producing a low-frequency growl during acceleration or deceleration.
- Intermittent gear engagement difficulty – Loss of washer integrity shifts the HOUSING alignment, causing clutch packs to drag and making shifts feel hesitant or harsh.
- Metallic debris in transmission fluid – A fractured washer sheds fine steel particles that contaminate the oil, often visible during routine drain intervals.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0730.103.773 |
| Material | Hardened carbon steel (C45E, induction-tempered) |
| Outer Diameter | 42.0 mm |
| Inner Diameter | 28.5 mm |
| Thickness | 2.5 mm |
| Weight | 12 grams |
| Surface Finish | Zinc-phosphate coated (corrosion resistant) |
| OEM Reference | ZF 0730.103.773 (genuine) |
Compatibility
This washer is a direct fit for the ZF WG 100 series transmission family. Based on its dimensional profile and application in the output shaft stack, it is also compatible with the WG 120, WG 150, and WG 180 models that share the same housing architecture. The part interfaces directly with the TRANSMISSION HOUSING and the HOUSING assembly. For WG 200 and WG 250 variants, verify the shaft diameter before installation, as these models may use a thicker variant. Always pair this washer with a fresh O-RING to ensure a leak-free seal against the HOUSING.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101006 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4651301034 | HOUSING | Intermediate housing for planetary gear retention |
| 0634303928 | O-RING | Static seal between housing and cover |
| 4651301013 | HOUSING | Rear housing component for output shaft |
| 4651301015 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4651301035 | SCREEN SHEET | Coarse mesh pre-filter for pump intake |
| 0630361028 | SEALING CAP | Plugs unused hydraulic ports |
| 4475280060 | SCREW PLUG | Seals threaded oil gallery access holes |
| 0634303312 | O-RING | Seals screw plug against pressure loss |
| 0630361063 | SEALING CAP | Protects unused sensor ports from debris |
