Overview
The ZF 4644.324.018 PUMP FLANGE is a critical OEM genuine component engineered for the WG 201 Series transmission family. This precision-machined flange serves as the mounting interface between the hydraulic pump and the transmission housing, ensuring correct oil flow and pressure regulation within the drivetrain. As an integral part of the pump assembly, the SKU 4644.324.018 directly supports torque converter lockup and clutch engagement functions. When installed alongside the 4644101203: TRANSMISSION HOUSING or the 4644301382: TRANSMISSION HOUSING, this flange creates a sealed, vibration-resistant connection that withstands high hydraulic pressures during heavy-duty operation.
Symptoms of Failure
When the ZF 4644.324.018 pump flange deteriorates, operators may notice specific performance issues. Hydraulic fluid seepage around the pump mounting area is a primary indicator, often appearing as dark streaks on the transmission exterior. Erratic gear engagement or delayed shifting can occur when the flange loses its sealing integrity, causing pressure drops in the clutch circuits. Unusual whining or cavitation noises from the pump suggest the flange is no longer providing proper alignment, leading to premature pump wear. Additionally, intermittent loss of forward or reverse drive under load may signal that the flange’s mating surface has warped or corroded, compromising oil delivery to the valve body.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4644.324.018 |
| OEM Reference | ZF WG 201 Series |
| Material | High-strength cast aluminum alloy |
| Weight | 1.45 kg (3.2 lbs) |
| Outer Diameter | 165 mm |
| Bolt Hole Pattern | 6 x M10 on 130 mm PCD |
| Surface Finish | Anodized corrosion protection |
| Sealing Groove | Integrated O-ring channel (accepts 0634306198: O-RING) |
Compatibility
This pump flange is specifically designed for ZF WG 201 Series transmissions, including the WG180, WG200, and WG210 variants. It also fits select WG 150 models produced after 2015 with the updated pump interface. The flange directly mounts to the 4644301189: THREADED BUSH and is secured using the 0636302005: SCREW PLUG for oil gallery sealing. For complete assembly, pair this flange with the 0634801098: SEALING RING and 0730365067: TYPE PLATE for identification. The 0631311009: GROOVED STUD and 4644301161: COVER PLATE are also commonly replaced during pump flange service, along with 0636100621: HEXAGON SCREW fasteners.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101203 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301382 | TRANSMISSION HOUSING | Alternate housing variant for WG201 |
| 4644301189 | THREADED BUSH | Alignment guide for pump flange bolts |
| 0636302005 | SCREW PLUG | Seals oil passage in flange bore |
| 0634306198 | O-RING | Hydraulic seal between flange and housing |
| 0634801098 | SEALING RING | Secondary leak prevention at bolt holes |
| 0730365067 | TYPE PLATE | Identification tag for transmission series |
| 0631311009 | GROOVED STUD | Locating pin for flange alignment |
| 4644301161 | COVER PLATE | Protects pump cavity from debris |
| 0636100621 | HEXAGON SCREW | Fastener for flange mounting |
