Overview
The ZF 4616.303.010 SPACER RING is a precision-engineered component designed for the WG65 series of heavy-duty transmissions. This OEM genuine part serves as a critical axial spacer, maintaining exact clearance between rotating assemblies and the transmission housing. Positioned within the gear train stack-up, the 4616.303.010 ensures proper preload on bearings and shafts, preventing metal-to-metal contact during high-torque operation. As a factory-specification component, this spacer ring directly supports the structural integrity of the entire WG65 gearbox assembly.
Symptoms of Failure
- Transmission housing oil seepage: A worn or deformed spacer ring can misalign seals, leading to fluid migration past the O-RING (0634313118) and causing visible drips at the bell housing.
- Abnormal gear whine under load: When the spacer ring loses its original thickness, axial play increases, allowing gear teeth to contact improperly and produce a high-pitched whining noise during acceleration.
- Intermittent gear engagement failure: Excessive clearance from a collapsed spacer ring can prevent shift forks from fully engaging clutches, resulting in delayed or missed shifts in the WG65.
- Bearing overheating: Insufficient axial preload due to a fatigued spacer ring forces bearings to operate outside their designed load zone, generating excess heat detectable through the SCREW PLUG (0636304019) inspection port.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.303.010 |
| Outer Diameter | 120 mm |
| Inner Diameter | 95 mm |
| Thickness | 3.5 mm |
| Material | Case-hardened steel (16MnCr5) |
| Surface Finish | Ground, Ra ≤ 0.8 µm |
| Weight | 0.085 kg |
| OEM Reference | 4616 303 010 |
| Hardness | 58-62 HRC |
Compatibility
This spacer ring is specifically validated for the ZF WG65 series, including the WG65, WG65C, and WG65E variants. It also fits select WG80 and WG90 models when used in conjunction with the TRANSMISSION HOUSING (4616101059). For proper installation, always pair this part with the correct fasteners: HEXAGON SCREW (0636011038), HEXAGON SCREW (0636011118), and HEXAGON SCREW (0636016015) to achieve the specified torque values. The 4616.303.010 is not interchangeable with spacer rings from the ZF Ecomat or AS Tronic series.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 0636011038 | HEXAGON SCREW | M10 x 30 fastener for housing joints |
| 0636011118 | HEXAGON SCREW | M12 x 35 fastener for bearing caps |
| 0636016015 | HEXAGON SCREW | M8 x 20 fastener for spacer retention |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0634313118 | O-RING | Static seal between housing and cover |
| 0636304019 | SCREW PLUG | M18 x 1.5 drain/fill port plug |
| 0634801152 | SEALING RING | Copper crush washer for plug sealing |
| 0732611049 | FILTER INSERT | Internal oil filtration element |
| 0634303718 | O-RING | Hydraulic circuit seal for valve body |
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