Overview
The ZF 4616.303.160 RING is a precision-engineered internal retaining component designed specifically for the WG 65 series transmission. This OEM genuine part functions as a critical spacer and load-distribution element within the planetary gear set assembly, ensuring correct axial clearance between rotating components. The SKU 4616.303.160 sits directly between the transmission housing and the gear carrier, preventing metal-on-metal contact during high-torque operations. When installed alongside the TRANSMISSION HOUSING, this ring maintains the structural integrity of the entire gear train under heavy-duty industrial loads.
Symptoms of Failure
- Audible grinding noise during gear engagement: A worn 4616.303.160 ring allows excessive axial play, causing gear teeth to clash during shifting. This symptom often appears alongside “ZF transmission grinding when accelerating” searches.
- Metallic debris in transmission oil: As the ring surface degrades, fine steel particles contaminate the fluid. This is frequently reported as “metal shavings in WG65 oil pan” in service records.
- Intermittent gear slipping under load: Loss of proper ring thickness reduces clamping force on the clutch pack, leading to “ZF WG65 transmission slipping in 3rd gear” complaints.
- Oil seepage at housing joint: Distortion of the ring can compromise the seal between the TRANSMISSION HOUSING and the cover, creating “ZF transmission leak at bell housing” issues.
Technical Specifications
| Part Number | 4616.303.160 |
| Outer Diameter | 160 mm |
| Inner Diameter | 145 mm |
| Thickness | 3.2 mm |
| Material | Case-hardened steel (16MnCr5) |
| Weight | 0.18 kg |
| OEM Reference | 4616 303 160 |
| Surface Finish | Ground, Ra ≤ 0.8 µm |
Compatibility
This ring is engineered for the ZF WG65 series, which includes the WG65, WG80, WG120, WG150, WG180, and WG200 transmission models. It is also compatible with the WG65-5 and WG65-6 variants used in municipal trucks and construction equipment. The 4616.303.160 RING is a direct replacement for the original factory component and requires no modification for installation. For proper assembly, always pair this ring with new HEXAGON SCREW fasteners, specifically the HEXAGON SCREW (M10x35) and HEXAGON SCREW (M12x40) for secure mounting.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101089 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 0636011038 | HEXAGON SCREW | M8x25 bolt for housing fastening |
| 0636011118 | HEXAGON SCREW | M10x35 bolt for ring retention |
| 0636016015 | HEXAGON SCREW | M12x40 bolt for cover mounting |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing positioning |
| 0634313118 | O-RING | Static seal between housing and cover |
| 0636304019 | SCREW PLUG | Oil drain port closure |
| 0634801152 | SEALING RING | Copper washer for plug sealing |
| 0732611049 | FILTER INSERT | Oil filtration element |
| 0634303718 | O-RING | Internal pressure seal for valve body |
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