Overview
The ZF 4642.354.003 PUMP FLANGE is a critical OEM genuine component engineered for the WG 150 Series transmission. 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 a factory-spec part, SKU 4642.354.003 guarantees exact fitment and durability, directly supporting the pump’s alignment to prevent vibration and fluid loss. It integrates seamlessly with the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING to form a sealed assembly that withstands high torque and thermal cycling.
Symptoms of Failure
- Hydraulic oil seepage around the pump mount: A worn or warped pump flange often leads to visible oil weeping at the joint, especially under load, indicating seal breakdown.
- Intermittent gear slipping or delayed engagement: When the flange loses dimensional stability, pump pressure drops, causing erratic clutch pack behavior and sluggish shifts.
- Abnormal whining or cavitation noise: Misalignment from a degraded flange can introduce air into the hydraulic circuit, producing a high-pitched sound during operation.
- Reduced transmission fluid level without external leaks: Internal leakage past the flange face can allow fluid to bypass into the bell housing, mimicking a slow leak while the sump level drops.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4642.354.003 |
| OEM Reference | ZF WG150 Series |
| Material | High-grade cast iron with corrosion-resistant coating |
| Overall Diameter | 185 mm (approx.) |
| Bolt Hole Pattern | 6-hole, 120° spacing |
| Weight | 1.8 kg (3.97 lbs) |
| Surface Finish | Ground mating face, Ra 0.8 µm |
| Sealing Groove | Integrated O-ring channel |
Compatibility
This pump flange is primarily designed for the ZF WG 150 transmission, but its mounting geometry also suits the WG 180 and WG 200 series when used with the correct pump adapter. It is not interchangeable with older WG 120 models without modification. Always verify the bolt pattern against your existing flange; the 4642.354.003 uses a standardized 6-bolt configuration common to mid-range ZF off-highway and marine transmissions. For complete assembly, pair it with the 0730365125: TYPE PLATE for identification and the 0631311009: GROOVED STUD for secure fastening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG150 |
| 0730365125 | TYPE PLATE | Identification tag for serial numbers |
| 0631311009 | GROOVED STUD | Fastener for pump flange mounting |
| 4642301168 | SCREEN SHEET | Fine mesh filter for oil intake |
| 4642301169 | SCREEN SHEET | Alternative mesh filter element |
| 0636100621 | HEXAGON SCREW | Bolt for housing attachment |
| 4642301186 | SCREEN SHEET | High-flow screen for heavy duty |
| 4644106300 | SHIFT SYSTEM | Hydraulic valve assembly for gear changes |
| 4644306500 | COVER PLATE | Access cover for shift mechanism |
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