Overview
The ZF 4616.329.020 FLANGE is a precision-machined component designed for the WG 65 Series transmission family. This OEM genuine part serves as the critical interface between the transmission output shaft and the driveline, ensuring torque transfer with zero tolerance for misalignment. Located at the rear of the gearbox, the flange couples directly to the output shaft and is secured by the 4616105415 OUTPUT assembly. The SKU 4616.329.020 is engineered to withstand high cyclic loads and thermal expansion, making it indispensable for heavy-duty industrial applications. Without this flange, the transmission cannot deliver power to the wheels or driven equipment.
Symptoms of Failure
- Oil seepage at the output seal interface: When the flange surface wears or develops micro-cracks, transmission fluid escapes past the seal, leaving puddles under the vehicle. Search queries like “ZF WG65 flange oil leak fix” often lead to this part.
- Driveline vibration during acceleration: A warped or damaged flange causes imbalance, transmitting harsh vibrations through the driveshaft. This symptom is frequently described as “ZF transmission shudder under load.”
- Premature bearing noise from the output housing: If the flange bore is out of round, it stresses the adjacent 4616303144 OUTPUT FLANGE, leading to a whining or grinding sound during gear engagement.
- Intermittent gear engagement failure: A loose flange can shift axially, preventing the transmission from fully engaging forward or reverse gears. This is a common complaint for “WG200 slipping out of gear.”
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.329.020 |
| Material | Forged steel, induction-hardened |
| Outer Diameter | 180 mm (7.09 in) |
| Bolt Circle Diameter | 145 mm (5.71 in) |
| Center Bore | 65 mm (2.56 in) |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4616.329.020 |
| Fastener Torque Spec | 120 Nm (88.5 lb-ft) |
Compatibility
This flange is engineered for the WG 65 Series transmissions, specifically models WG65, WG80, WG120, WG150, WG180, and WG200. It also fits select ZF off-highway and marine gearboxes that share the same output shaft spline pattern (65 mm diameter, 12-spline). Always verify the spline count and bolt pattern against your existing 4616101094 TRANSMISSION HOUSING before installation. The flange is secured using 0636011038 HEXAGON SCREW fasteners, which must be replaced if corroded.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105415 | OUTPUT | Transfers rotational force from the gearset to the flange |
| 4616303144 | OUTPUT FLANGE | Secondary flange for dual-output configurations |
| 4616101094 | TRANSMISSION HOUSING | Encloses the gear train and supports the output shaft |
| 0636011038 | HEXAGON SCREW | M10 bolt for flange-to-housing attachment |
| 0636011118 | HEXAGON SCREW | M12 bolt for heavy-duty flange retention |
| 0636016015 | HEXAGON SCREW | M8 bolt for accessory bracket mounting |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for precise flange centering |
| 0634313118 | O-RING | Seals the flange-to-housing joint against fluid leaks |
| 0732611049 | FILTER INSERT | Traps debris in the transmission oil circuit |
| 0634303718 | O-RING | Secondary seal for the output shaft bore |
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