Overview
The ZF 4616.303.008 OIL FEEDING RING is a precision-engineered component designed for the WG 65 series transmission. This genuine OEM part functions as a critical fluid distribution hub, directing pressurized transmission oil to the planetary gear sets and clutch packs within the main housing. Located between the pump housing and the valve body, the oil feeding ring ensures consistent lubrication and hydraulic pressure across all rotating assemblies. The SKU 4616.303.008 is manufactured to ZF’s exacting tolerances, featuring hardened steel construction to withstand high thermal loads and continuous oil flow. When paired with a properly sealed TRANSMISSION HOUSING, this ring prevents cross-contamination between lubrication circuits and maintains optimal gearbox efficiency.
Symptoms of Failure
- Low transmission oil pressure warnings – A worn or cracked feeding ring allows oil to bypass the intended channels, triggering dashboard alerts and reducing clutch engagement force.
- Gear slipping under load – Insufficient oil delivery to the planetary gears causes momentary loss of torque transfer, particularly during uphill climbs or heavy hauling.
- External oil seepage at the housing joint – Deterioration of the ring’s sealing surfaces leads to visible drips around the transmission case, often mistaken for a gasket failure.
- Erratic shift timing – Inconsistent hydraulic pressure from a damaged ring results in delayed or harsh gear changes, especially in automatic mode.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.303.008 |
| Material | Hardened alloy steel (DIN 1.7131) |
| Outer Diameter | 112.5 mm |
| Inner Diameter | 68.3 mm |
| Thickness | 14.2 mm |
| Weight | 0.34 kg |
| OEM Reference | ZF 4616.303.008 |
| Surface Finish | Ground, nitrided |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This oil feeding ring is specifically engineered for the ZF WG 65 series transmissions, including models WG65, WG65-2, and WG65-3. It also fits select variants of the WG180 and WG200 series where the oil distribution geometry matches. For proper installation, secure the ring using HEXAGON SCREW (0636011038) and HEXAGON SCREW (0636011118) for the main housing bolts. The HEXAGON SCREW (0636016015) is required for securing the oil pump cover. Always verify compatibility by cross-referencing your transmission’s serial number with ZF’s technical documentation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Encloses the gear train and oil circuits |
| 0636011038 | HEXAGON SCREW | Secures housing to bell housing |
| 0636011118 | HEXAGON SCREW | Fastens oil pan to housing |
| 0636016015 | HEXAGON SCREW | Mounts oil pump cover |
| 0631306085 | CYLINDRICAL PIN | Aligns feeding ring during assembly |
| 0634313118 | O-RING | Seals feeding ring to housing bore |
| 0636304019 | SCREW PLUG | Closes oil gallery access ports |
| 0634801152 | SEALING RING | Prevents oil leaks at plug threads |
| 0732611049 | FILTER INSERT | Traps debris before oil enters ring |
| 0634303718 | O-RING | Seals filter housing to ring |
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