Overview
The ZF 4616.328.016 PUMP FLANGE is a critical hydraulic interface component engineered for the WG 65 Series transmission. This OEM genuine part serves as the mounting point and fluid coupling between the transmission’s hydraulic pump and the main gearbox housing. By securing the pump assembly and ensuring precise alignment, the flange maintains optimal oil flow and pressure for clutch engagement and gear shifts. The SKU 4616.328.016 is precision-machined to ZF’s exacting tolerances, making it essential for any rebuild or repair of the WG65 drivetrain. When replacing this flange, technicians often also inspect the 4616105413: OUTPUT and the 4616203017: OUTPUT FLANGE to ensure complete sealing integrity.
Symptoms of Failure
- Hydraulic oil seepage at the pump interface: A worn or cracked pump flange often causes visible oil leaks around the pump mounting area, leading to low fluid levels and erratic shifting.
- Transmission slipping under load: When the flange loses its seal, hydraulic pressure drops, resulting in gear slippage during acceleration or hill climbing.
- Unusual whining or cavitation noise: A misaligned or damaged flange allows air to enter the pump circuit, producing a high-pitched whine from the transmission pump.
- Delayed engagement from Park to Drive/Reverse: Insufficient pump pressure due to flange wear can cause a noticeable lag when selecting gears, a common long-tail search query for WG65 owners.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4616.328.016 |
| Material | High-strength aluminum alloy (die-cast) |
| Weight | 0.85 kg (1.87 lbs) |
| Flange Outer Diameter | 120 mm |
| Bolt Hole Pattern | 4-hole, 90 mm PCD |
| OEM Reference | ZF 4616.328.016 |
| Surface Treatment | Anodized for corrosion resistance |
Compatibility
This pump flange is specifically designed for the ZF WG 65 Series transmission family. Based on its part number structure and hydraulic interface, it is compatible with the following ZF models: WG65, WG80, WG120, WG150, WG180, and WG200. It is also used in certain off-highway and industrial drivetrains that share the WG65 pump mounting pattern. Always verify the flange’s bolt pattern against your existing 4616101117: TRANSMISSION HOUSING before installation. Use a new 0636011038: HEXAGON SCREW set to secure the flange to the housing for proper torque retention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | Output | Transfers torque from the transmission to the driveshaft |
| 4616203017 | Output Flange | Connects the output shaft to the driveline yoke |
| 4616101117 | Transmission Housing | Main structural casing that encloses all internal gears and shafts |
| 0636011038 | Hexagon Screw | Fastener for securing the pump flange to the housing |
| 0636016015 | Hexagon Screw | Alternate fastener for flange mounting points |
| 0631306085 | Cylindrical Pin | Alignment dowel for precise flange positioning |
| 0634313118 | O-Ring | Seals the flange-to-pump interface against oil leaks |
| 0732611049 | Filter Insert | Hydraulic oil filtration element for the pump circuit |
| 0634303718 | O-Ring | Secondary seal for the flange-to-housing joint |
| 0636610082 | Stud | Threaded rod for mounting auxiliary components to the flange |
