Overview
The ZF 4616.303.050 OIL FEEDING RING is a precision-engineered component designed specifically for the WG 65 Series transmission. This genuine OEM part directs pressurized hydraulic fluid to the rotating clutch packs and planetary gear sets within the transmission assembly. Positioned between the rotating shaft and the stationary housing, the oil feeding ring ensures consistent lubrication and cooling flow under high-torque conditions. The SKU 4616.303.050 is manufactured to ZF’s exacting tolerances, guaranteeing a leak-free seal and optimal oil distribution throughout the transmission’s hydraulic circuit.
Symptoms of Failure
- Transmission oil leaks around the bell housing area – Worn sealing surfaces on the oil feeding ring allow fluid to bypass, resulting in visible drips or puddles beneath the vehicle.
- Gear slipping under load – Insufficient hydraulic pressure due to a degraded ring causes clutch packs to engage inconsistently, particularly during uphill climbs or heavy towing.
- Erratic shift timing – A damaged oil feeding ring disrupts the precise oil flow needed for smooth gear changes, leading to delayed or harsh shifts.
- Overheating transmission fluid – Reduced lubrication flow from a failing ring accelerates thermal breakdown, often triggering warning lights or burnt-smelling fluid.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4616.303.050 |
| Material | Hardened steel with nitrile sealing lip |
| Outer Diameter | 68.5 mm |
| Inner Diameter | 50.0 mm |
| Thickness | 12.0 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 4616.303.050 |
| Operating Pressure | 12–18 bar |
| Temperature Range | -40°C to +120°C |
Compatibility
This oil feeding ring is primarily designed for the ZF WG 65 Series transmissions. Based on its construction and hydraulic routing, it is also compatible with the following ZF models: WG180, WG200, WG250, and WG300 series. Always verify your transmission’s serial number against the OEM parts catalog before installation.
Related Components
When replacing the oil feeding ring, inspect these companion parts that share the same hydraulic circuit. The OUTPUT (4616105415) and OUTPUT FLANGE (4616303144) must be checked for wear at the sealing interface. Additionally, the TRANSMISSION HOUSING (4616101094) should be inspected for cracks, and the HEXAGON SCREW (0636011038) should be replaced to ensure proper clamping force.
| Part Number | Name | Function |
|---|---|---|
| 4616105415 | OUTPUT | Transfers torque from transmission to driveshaft |
| 4616303144 | OUTPUT FLANGE | Connects output shaft to driveline components |
| 4616101094 | TRANSMISSION HOUSING | Encloses and supports internal gear train |
| 0636011038 | HEXAGON SCREW | Secures housing and flange assemblies |
| 0636011118 | HEXAGON SCREW | Fastens oil pan and valve body covers |
| 0636016015 | HEXAGON SCREW | Mounts clutch pack retainers |
| 0631306085 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634313118 | O-RING | Seals oil passages between mating surfaces |
| 0732611049 | FILTER INSERT | Removes contaminants from hydraulic fluid |
| 0634303718 | O-RING | Prevents external oil leakage at ports |
