ZF 0501.223.221 RUNNING DISK

Overview

The ZF 0501.223.221 RUNNING DISK is a critical friction component engineered for high-stress environments within ZF powershift transmissions. Positioned between planetary gear sets and clutch packs, this OEM genuine part modulates torque transfer and ensures smooth gear engagement under heavy loads. As a consumable wear item, the SKU 0501.223.221 directly influences hydraulic clamping force distribution, making it indispensable for maintaining precise shift timing in construction machinery. When paired with the 4663101003: HOUSING, this running disk forms the core of the clutch assembly, where its steel-backed friction lining must withstand extreme thermal cycling without delamination.

Symptoms of Failure

• Erratic gear engagement under load: Worn friction material causes delayed or harsh shifting, particularly when excavators or loaders operate on inclines.
• Transmission fluid darkening or burnt odor: Excessive slip generates localized heat, degrading ATF and producing visible contamination within the 4663301026: COVER cavity.
• Intermittent loss of drive in specific gears: Reduced clamping force from a glazed running disk surface leads to pressure bleed-off, often misdiagnosed as a valve body issue.
• Metallic chatter during cold starts: Warped disks create uneven contact patterns, causing audible vibration until hydraulic pressure stabilizes.

Technical Specifications

Compatibility

This running disk is engineered for ZF WG180, WG200, and WG211 series transmissions commonly deployed in wheel loaders, dozers, and telescopic handlers. It also appears in select 4WG-200 and 6WG-180 variants where multi-disk clutch packs require identical friction geometry. Always verify stack height using the 0631306816: CYLINDRICAL PIN alignment tool during reassembly, as incorrect preload accelerates wear. The 0636100817: CAP SCREW torque specification must be observed to prevent housing distortion that compromises disk parallelism.

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