Overview
The ZF 4616.329.005 PUMP FLANGE is a critical hydraulic interface component engineered specifically for the WG 65 Series transmission family. This OEM genuine part, identified by SKU 4616.329.005, serves as the mounting and sealing point between the transmission pump and the main housing. It ensures precise alignment of the pump drive gear while maintaining hydraulic pressure integrity. Without this flange, the pump cannot deliver the necessary oil flow for clutch actuation and torque converter lock-up. It works in direct conjunction with the 4616105413: OUTPUT shaft assembly to transfer rotational force, and is secured within the 4616101117: TRANSMISSION HOUSING using precision fasteners.
Symptoms of Failure
- External hydraulic oil seepage at pump flange joint: When the flange face warps or the sealing surface corrodes, pressurized ATF will weep past the gasket, leaving visible drips on the bell housing. This is a common “ZF WG65 oil leak at pump flange” issue.
- Erratic shift timing or delayed engagement: A worn flange bore allows the pump gear to wobble, reducing volumetric efficiency. This causes “low line pressure on ZF WG65 transmission” symptoms, leading to soft shifts or slipping in forward gears.
- Metallic debris in transmission pan: As the flange wears against the pump housing, aluminum or steel particles contaminate the fluid. This is often misdiagnosed as a pump failure, but the flange itself is the root cause.
- Whining noise from transmission pump area: Misalignment from a damaged flange creates gear mesh noise, particularly at idle or low RPM. This “ZF transmission pump whine” worsens as the flange bore elongates.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4616.329.005 |
| Material | High-strength aluminum alloy (EN AC-42100) |
| Weight | 1.85 kg (4.08 lbs) |
| Flange Outer Diameter | 165 mm |
| Bolt Hole Pattern | 6x M12 on 140 mm PCD |
| O-Ring Groove | Single internal groove for 0634313118 |
| Surface Finish | Ra 0.8 µm on sealing face |
| OEM Reference | ZF 4616.329.005 |
Compatibility
This pump flange is designed for the ZF WG 65 Series transmissions, which includes models such as WG65, WG80, WG120, WG180, and WG200. It is also used in select Ecomat 4HP and 6HP variants that share the same pump mounting architecture. The flange interfaces directly with the 4616203017: OUTPUT FLANGE on the rear of the pump assembly and is retained by 0636011038: HEXAGON SCREW fasteners. Always verify your transmission serial number against the ZF parts catalog before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from pump to transmission input shaft |
| 4616203017 | OUTPUT FLANGE | Connects pump output to driveline components |
| 4616101117 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating assemblies |
| 0636011038 | HEXAGON SCREW | M12 bolt for securing pump flange to housing |
| 0636016015 | HEXAGON SCREW | M10 bolt for auxiliary bracket attachment |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for precise flange positioning |
| 0634313118 | O-RING | Internal seal between flange and pump housing |
| 0732611049 | FILTER INSERT | Suction strainer for pump inlet protection |
| 0634303718 | O-RING | External seal for flange-to-housing interface |
| 0636610082 | STUD | Threaded rod for pump-to-flange mounting |
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