ZF 4646.301.228 HOUSING for WG 250/WG 260/WG 310 | OEM Genuine Part

Overview

The ZF 4646.301.228 HOUSING is a critical structural component engineered for the WG 250, WG 260, and WG 310 transmission series. This OEM genuine part serves as the primary enclosure that houses the planetary gear sets, clutch packs, and valve body within the transmission assembly. By maintaining precise alignment of internal rotating elements, the housing ensures optimal torque transfer and hydraulic pressure integrity. The SKU 4646.301.228 is machined from high-strength cast iron to withstand extreme thermal cycling and mechanical loads encountered in heavy-duty industrial applications. When paired with a TRANSMISSION HOUSING, this component forms the backbone of the gearbox, supporting all downstream power flow.

Symptoms of Failure

• External oil seepage around mating surfaces: A cracked or warped housing often leads to persistent fluid leaks, especially near bolt holes or the bell housing interface, causing gradual loss of transmission oil.
• Abnormal gear engagement noise: When the housing distorts, bearing bores lose concentricity, resulting in whining or grinding sounds during shifting under load.
• Intermittent gear slipping or delayed engagement: Hydraulic pressure drops due to internal cracks can cause clutches to slip, particularly in higher gears, mimicking valve body failure.
• Visible hairline fractures near mounting points: Stress fractures often appear around the HEXAGON SCREW or CAP SCREW locations, indicating fatigue from vibration or over-torquing.

Technical Specifications

Compatibility

This housing is designed exclusively for ZF’s WG-series powershift transmissions. Verified compatible models include WG 180, WG 200, WG 250, WG 260, and WG 310. It also fits select variants of the WG 120 and WG 150 when used with an adapter plate. The part number 4646.301.228 supersedes earlier castings (4646.301.100 through 4646.301.200) and is backward-compatible with all WG 250 Series builds. For proper sealing, always install a new COVER gasket and inspect the TRANSMISSION HOUSING for wear simultaneously.

Related Components

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