ZF 4642.324.020 PUMP FLANGE for WG180/WG200 | OEM Genuine Part

Overview

The ZF 4642.324.020 PUMP FLANGE is a critical mounting interface within the WG180 and WG200 transmission series. This OEM genuine part, identified by SKU 4642.324.020, connects the hydraulic pump directly to the transmission housing, ensuring precise alignment and oil flow regulation. It sits between the main transmission casing and the pump assembly, acting as a rigid adapter that absorbs torsional loads. Without this flange, the pump cannot maintain proper hydraulic pressure, leading to system inefficiency. It is also compatible with select WG 65 Series configurations where pump mounting geometry matches.

Symptoms of Failure

• Hydraulic fluid seepage around the pump mounting point: A worn or cracked 4642.324.020 flange often causes oil to weep from the mating surface, leaving visible stains on the transmission housing.
• Intermittent gear slipping under load: When the pump flange distorts, hydraulic pressure drops, causing the transmission to hesitate or slip during heavy acceleration.
• Abnormal pump noise or vibration: A loose or fatigued flange allows the pump to misalign, producing a whining or grinding sound that intensifies with RPM.
• Difficulty engaging forward or reverse gears: Insufficient pump pressure due to a failing flange leads to delayed or harsh gear engagement, especially in cold conditions.

Technical Specifications

Compatibility

This pump flange is engineered for the ZF WG180 and WG200 series transmissions used in heavy-duty trucks and construction equipment. It also fits the WG 65 Series when the pump mounting interface matches the 4642.324.020 bolt pattern. For proper installation, ensure the TRANSMISSION HOUSING is free of cracks and the HEXAGON SCREW fasteners are torqued to factory specifications. The flange seals against the HOUSING and the HOUSING assembly, requiring a new O-ring during replacement.

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