Overview
The ZF 4642.355.005 PUMP FLANGE is a critical hydraulic interface component engineered specifically for the WG 150 transmission series. This OEM genuine part serves as the mounting and sealing point between the transmission pump and the main gearcase, ensuring precise oil flow and pressure regulation during torque conversion. The SKU 4642.355.005 is machined to exact factory tolerances to prevent fluid bypass and maintain system integrity. When installed correctly, this flange stabilizes the pump assembly against vibration and thermal expansion, directly influencing shift quality and clutch pack engagement. It is often replaced in conjunction with the 4642101047: TRANSMISSION HOUSING to restore full hydraulic circuit sealing.
Symptoms of Failure
- Hydraulic fluid seepage at pump mounting interface: A worn or warped pump flange allows transmission fluid to escape around the pump housing, leaving visible wet spots on the bell housing or under the vehicle.
- Erratic or delayed gear engagement: Loss of pump pressure due to flange distortion causes inconsistent clutch pack fill times, resulting in harsh shifts or hesitation when moving from Neutral to Drive.
- Whining or cavitation noise from the transmission pump: Air ingestion through a compromised flange seal creates a high-pitched whine that changes with engine RPM, indicating inadequate lubrication and potential pump damage.
- Overheating transmission fluid: Reduced pump efficiency from a leaking flange forces the system to work harder, elevating sump temperatures beyond normal operating ranges.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4642.355.005 |
| Material | High-strength cast aluminum alloy |
| Surface Treatment | Anodized corrosion protection |
| Overall Diameter | 185 mm (approx.) |
| Bolt Hole Circle | 160 mm (approx.) |
| Thickness | 22 mm (approx.) |
| Weight | 0.85 kg (approx.) |
| OEM Reference | ZF 4642.355.005 |
| Sealing Groove | Integrated O-ring channel |
Compatibility
This pump flange is primarily designed for the ZF WG 150 series, but it also fits select variants within the WG 180 and WG 200 families due to shared pump mounting patterns. It is commonly used in off-highway vehicles, material handlers, and medium-duty trucks equipped with ZF automatic transmissions. Always verify the pump housing casting number before ordering. The flange works in tandem with the 4642301207: TRANSMISSION HOUSING to create a sealed pump cavity. For identification purposes, the 0730365067: TYPE PLATE should be consulted to confirm transmission model and build date. Additionally, the 0631311009: GROOVED STUD is required for proper flange alignment during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Main structural case enclosing gear sets |
| 4642301207 | TRANSMISSION HOUSING | Alternate housing variant for specific models |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Alignment stud for pump flange positioning |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4642301169 | SCREEN SHEET | Secondary filter screen for debris protection |
| 0636100621 | HEXAGON SCREW | Fastener for flange and housing assembly |
| 4642301186 | SCREEN SHEET | High-flow filter screen for heavy-duty use |
| 4644106300 | SHIFT SYSTEM | Hydraulic control unit for gear selection |
| 4644306500 | COVER PLATE | Access cover for pump inspection |
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