Overview
The ZF 4616.305.071 RING is a precision-engineered internal component designed exclusively for the WG 65 series transmission. This OEM genuine part functions as a critical sealing and spacing element within the planetary gear set assembly, ensuring proper alignment and hydraulic pressure retention during high-torque operations. The SKU 4616.305.071 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn rings in heavy-duty industrial transmissions. When installed alongside a TRANSMISSION HOUSING, this ring prevents metal-to-metal contact and maintains the structural integrity of the rotating assembly.
Symptoms of Failure
- Hydraulic pressure loss and gear slipping – A worn 4616.305.071 ring allows pressurized fluid to bypass the clutch pack, causing delayed engagement or complete gear slip under load.
- Metallic debris in transmission oil – As the ring surface degrades, microscopic metal particles contaminate the fluid, often detected during routine oil analysis or filter inspection.
- Audible whining or grinding noises – Excessive clearance from a failed ring permits axial play in the gear train, producing a distinct high-pitched whine during acceleration or deceleration.
- Erratic shift timing – The ring’s failure disrupts the precise oil flow required for clutch modulation, resulting in harsh or delayed shifts that worsen over time.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4616.305.071 |
| Material | Case-hardened steel with phosphate coating |
| Outer Diameter | 305 mm (estimated) |
| Inner Diameter | 271 mm (estimated) |
| Thickness | 8.5 mm (estimated) |
| Weight | 0.95 kg (estimated) |
| OEM Reference | ZF 4616.305.071 |
| Torque Capacity | Up to 2,500 Nm (system dependent) |
Compatibility
This ring is specifically engineered for the ZF WG 65 series, which includes the WG65, WG180, WG200, and WG250 transmission models. It is also compatible with certain WG 65 variants used in off-highway vehicles, construction equipment, and agricultural machinery. For proper installation, this ring must be paired with HEXAGON SCREW fasteners (part 0636011038) and HEXAGON SCREW (part 0636011118) to secure the housing assembly. Additionally, the HEXAGON SCREW (0636016015) is required for mounting the ring to the planetary carrier. Always verify your transmission’s serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101089 | TRANSMISSION HOUSING | Encloses and supports the gear train assembly |
| 0636011038 | HEXAGON SCREW | Secures housing and ring components |
| 0636011118 | HEXAGON SCREW | Fastens planetary carrier assembly |
| 0636016015 | HEXAGON SCREW | Mounts ring to planetary carrier |
| 0631306085 | CYLINDRICAL PIN | Aligns housing and ring during assembly |
| 0634313118 | O-RING | Seals hydraulic passages |
| 0636304019 | SCREW PLUG | Closes oil ports and drain holes |
| 0634801152 | SEALING RING | Prevents external oil leaks |
| 0732611049 | FILTER INSERT | Traps contaminants in oil circuit |
| 0634303718 | O-RING | Seals filter housing connection |
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