ZF 0501.220.084 FILTER SCREW for WG100/WG130/WG131

Overview

The ZF 0501.220.084 FILTER SCREW is a precision-engineered OEM genuine component designed for the lubrication circuit within ZF WG series transmissions. This part, identified by SKU 0501.220.084, functions as a critical retention and sealing element for the main oil filter assembly, ensuring that pressurized transmission fluid is properly directed through the filter media before reaching the valve body and torque converter. Positioned directly within the filter housing bore, the screw secures the filter element in place while maintaining a leak-proof seal under high hydraulic pressure. For complete filter housing integrity, this screw is often replaced alongside the 4663101001: HOUSING and the 4663301025: COVER during a full transmission overhaul.

Symptoms of Failure

When the ZF 0501.220.084 filter screw wears or becomes damaged, several distinct operational issues arise. Look for these specific failure symptoms to identify a failing part:

• Transmission fluid leaks at the filter housing: A compromised filter screw thread or sealing face allows pressurized oil to weep past the housing joint, often visible as drips near the transmission pan rail.
• Erratic gear engagement or delayed shifting: If the screw loosens, the filter element can shift, causing intermittent oil starvation to the valve body, resulting in harsh or delayed clutch application.
• Low transmission line pressure warnings: A loose or stripped filter screw permits oil to bypass the filter, reducing hydraulic pressure to the shift solenoids and torque converter clutch.
• Metallic debris in the transmission pan: A failing screw can shed microscopic metal particles into the fluid circuit, accelerating wear on bearings and planetary gearsets.

Technical Specifications

Compatibility

This ZF filter screw is engineered for the WG series of powershift transmissions. It is a direct replacement for the following models:

• ZF WG100 – All variants (WG100, WG100-1, WG100-2)
• ZF WG130 – Standard and heavy-duty configurations
• ZF WG131 – Including WG131-1 and WG131-2
• ZF WG180 – Select models with M14 filter ports
• ZF WG200 – Earlier production runs (verify thread pitch)

When servicing these transmissions, always inspect the 0631306816: CYLINDRICAL PIN that aligns the filter housing to the valve body, and replace the 0636100817: CAP SCREW securing the cover plate to prevent cross-threading.

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