Overview
The ZF 4644.324.027 PUMP FLANGE is a precision-machined component engineered for the hydraulic pump interface within the WG150 and WG200 transmission series. This OEM genuine part, identified by SKU 4644.324.027, serves as the critical mounting and sealing point between the transmission housing and the hydraulic pump assembly. It ensures proper alignment of the pump drive gear while maintaining oil pressure integrity within the lubrication circuit. As a load-bearing flange, it directly influences the transmission’s ability to maintain consistent hydraulic flow for clutch engagement and gear shifts. The flange is designed to withstand high torsional loads and thermal cycling inherent in heavy-duty industrial applications.
Symptoms of Failure
When the ZF 4644.324.027 pump flange deteriorates, operators may notice specific performance degradation. External oil seepage around the pump mounting area is a primary indicator, often presenting as wetness or drips near the flange-to-housing joint. Intermittent gear slipping under load occurs when the flange warps, disrupting pump alignment and reducing hydraulic pressure. Abnormal whining or cavitation noise from the pump suggests the flange’s mating surface has worn, allowing air ingress into the hydraulic system. Gradual loss of transmission fluid without visible external leaks can indicate internal bypass through a compromised flange seal, leading to delayed engagement and overheating.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.324.027 |
| Material | High-grade cast iron with corrosion-resistant coating |
| Overall Diameter | 180 mm (approx.) |
| Mounting Bolt Pattern | 6-hole, 130 mm BCD |
| Flange Thickness | 22 mm (critical sealing surface) |
| Weight | 1.8 kg (4.0 lbs) |
| OEM Reference | ZF 4644.324.027 (genuine) |
| Surface Finish | Ra 0.8 µm on sealing face |
Compatibility
This pump flange is specifically validated for the ZF WG150 and WG200 series transmissions. It directly interfaces with the 4642101047 TRANSMISSION HOUSING and the 4642301207 TRANSMISSION HOUSING variants. The flange also mates with the 0730365067 TYPE PLATE for identification purposes and is secured using the 0631311009 GROOVED STUD. While primarily designed for WG150 and WG200 models, it may also be compatible with certain WG180 configurations that share the same pump mounting geometry. Always verify the housing casting number before installation to ensure proper fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301207 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification and specification label |
| 0631311009 | GROOVED STUD | Flange mounting fastener |
| 4642301168 | SCREEN SHEET | Hydraulic fluid filtration element |
| 4642301169 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 0636100621 | HEXAGON SCREW | Housing bolt for flange retention |
| 4642301186 | SCREEN SHEET | Secondary oil strainer component |
| 4644106300 | SHIFT SYSTEM | Gear selection and actuation assembly |
| 4644306500 | COVER PLATE | Access cover for pump inspection |
