ZF 0501.326.259 VALVE BODY for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 0501.326.259 VALVE BODY is a precision hydraulic control unit that directs oil flow within the WG100, WG130, and WG131 transmission series. Mounted inside the main HOUSING, this OEM genuine part regulates clutch engagement and shift timing by channeling pressurized fluid through calibrated passages. The SKU 0501.326.259 is machined from high-strength aluminum alloy and features integrated solenoid bores for electronic modulation. As the brain of the transmission’s hydraulic circuit, it ensures smooth gear transitions under heavy-duty industrial loads.

Symptoms of Failure

• Delayed or harsh shifting – Worn spool valves inside the 0501.326.259 cause erratic clutch fill times, leading to jarring upshifts or hesitation when accelerating.
• Transmission oil leaks at the valve body interface – Degraded gaskets or micro-cracks in the casting allow ATF to seep past the COVER, leaving puddles under the bell housing.
• Gear slipping under load – Internal bore wear reduces line pressure, causing the transmission to lose torque transfer on inclines or during towing.
• Erratic neutral-to-drive engagement – A sticking valve in the 0501.326.259 delays forward gear application, creating a dangerous lurch when selecting Drive.

Technical Specifications

Compatibility

This valve body is engineered for ZF WG100, WG130, and WG131 off-highway transmissions found in loaders, graders, and agricultural tractors. It also fits select WG180 and WG200 variants when used with the correct CYLINDRICAL PIN alignment kit. Always verify the casting number on your existing unit before ordering. The 0501.326.259 replaces earlier revisions and requires the CAP SCREW set (sold separately) for proper installation.

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