ZF 0501.321.230 CLUTCH BODY for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 0501.321.230 CLUTCH BODY is a critical hydraulic component within the WG100, WG130, and WG131 transmission series. This OEM genuine part houses the clutch pack and piston assembly, converting hydraulic pressure into mechanical force to engage specific gear sets. Positioned directly on the main shaft, the clutch body ensures precise torque transfer during shifting operations. The SKU 0501.321.230 is engineered to ZF’s original tolerances, guaranteeing seamless integration with the transmission’s oil flow channels and sealing surfaces.

Symptoms of Failure

• Delayed or harsh gear engagement — When the clutch body’s sealing surfaces wear, hydraulic pressure drops, causing sluggish shifts or sudden engagement that jolts the driveline.
• Transmission oil contamination — Cracks in the clutch body allow debris or metal shavings to enter the hydraulic circuit, often visible as dark or gritty fluid during drain intervals.
• Slipping under load — A worn clutch body cannot maintain clamping force on the clutch pack, leading to RPM flare without corresponding vehicle acceleration, especially on inclines.
• External oil seepage — Degraded O-ring grooves or housing porosity cause fluid to weep from the bell housing area, leaving visible drips after extended operation.

Technical Specifications

Compatibility

This clutch body is specifically designed for ZF WG100, WG130, and WG131 transmissions, commonly found in medium-duty trucks, buses, and off-highway equipment. It also fits select variants of the WG180 and WG200 series where the clutch body diameter and spline count match. Always verify the transmission serial number against the 0501.321.230 specifications before installation. The part interfaces directly with the 2094104412 MAIN SHAFT and 2094304054 MAIN SHAFT, which transfer rotational force through the gear train.

Related Components

During rebuilds, always inspect the 2094106010 SHIFT SYSTEM for wear, as damaged shift valves can cause uneven pressure distribution across the clutch body. The 2094206001 GEARSHIFT SHAFT should also be checked for straightness to prevent binding that accelerates clutch body seal failure.

Frequently Asked Questions

Q: Can the 0501.321.230 clutch body be used in a ZF WG180 transmission?
A: Yes, but only if the transmission has the same spline count and piston bore diameter. Measure the main shaft at the clutch body seating area—WG180 units built after 2010 may require the 2094304054 main shaft for proper fit.

Q: What causes the clutch body to crack internally?
A: Repeated thermal shock from rapid shifting under heavy load is the primary cause. Always replace the 0630513070 SNAP RING and 2094306019 WASHER during clutch body replacement to maintain proper preload.

Q: How do I verify this is the correct clutch body for my WG131?
A: Check the casting number on the original part—it should match 0501.321.230. Also confirm the 2093206001 BUSH inside the clutch body is not worn, as a loose bushing will cause misalignment even with a new clutch body.