Overview
The ZF 4642.311.204 PUMP FLANGE is a critical OEM genuine component engineered specifically for the WG 150 Series transmission. This precision-machined flange serves as the primary interface between the hydraulic pump and the transmission housing, ensuring a sealed, vibration-resistant connection that maintains optimal oil flow and pressure. Positioned at the rear of the transmission assembly, the SKU 4642.311.204 directly supports the pump drive system, making it essential for consistent torque converter and clutch operation. Without this flange, the hydraulic circuit cannot maintain the integrity required for heavy-duty industrial applications.
Symptoms of Failure
- Hydraulic fluid seepage around the pump mounting area: A worn or cracked 4642.311.204 flange often leads to visible oil leaks at the pump-to-housing joint, causing gradual fluid loss and potential transmission overheating.
- Intermittent gear engagement or slipping under load: When the pump flange loses its sealing integrity, hydraulic pressure drops, resulting in delayed or erratic gear shifts, particularly during high-torque operations.
- Unusual whining or cavitation noise from the pump: A misaligned or damaged flange can introduce air into the hydraulic system, producing a distinct high-pitched sound as the pump struggles to maintain prime.
- Increased transmission operating temperature: Reduced fluid circulation due to flange failure forces the system to work harder, leading to elevated thermal stress and accelerated wear on internal components.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4642.311.204 |
| Material | High-grade cast aluminum alloy (GG-AlSi9Cu3) |
| Weight | 1.85 kg (4.08 lbs) |
| Outer Diameter | 185 mm |
| Bolt Hole Pattern | 6 x M12 on 150 mm PCD |
| Surface Finish | Anodized corrosion-resistant coating |
| OEM Reference | ZF 4642.311.204 |
| Torque Specification | 85 Nm ±5 Nm |
Compatibility
This pump flange is primarily designed for the ZF WG 150 Series, but it also fits select models in the WG 180 and WG 200 families due to shared pump mounting interfaces. It is directly compatible with transmissions featuring the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING. For proper identification, always cross-reference the 0730365125: TYPE PLATE on your unit. Additionally, the flange mounts using the 0631311009: GROOVED STUD to ensure precise alignment. Applications include off-highway trucks, wheel loaders, and industrial power take-off systems where the WG150 is standard.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301205 | TRANSMISSION HOUSING | Alternative housing variant for WG series |
| 0730365125 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment fastener for pump flange |
| 4642301168 | SCREEN SHEET | Oil filtration mesh for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Fine filtration screen for debris protection |
| 0636100621 | HEXAGON SCREW | Mounting bolt for flange assembly |
| 4642301186 | SCREEN SHEET | High-flow filter for heavy-duty use |
| 4644106085 | SHIFT SYSTEM | Hydraulic valve body for gear selection |
| 4642306050 | COVER PLATE | Protective cover for pump access port |
