Overview
The ZF 0501.212.373 Outer Clutch Disk is a critical friction component engineered for the WG115 and compatible ZF powershift transmissions. This OEM genuine part sits within the clutch pack assembly, where it transfers torque between rotating drums and hubs during gear engagement. As a wear item, the 0501.212.373 disk ensures smooth, positive shifts by providing the necessary friction surface for clutch lock-up. When paired with a properly sealed TRANSMISSION HOUSING, this disk maintains hydraulic pressure integrity, preventing premature clutch slippage. The SKU 0501.212.373 is manufactured to ZF’s original tolerances, guaranteeing a direct fit without modification.
Symptoms of Failure
- Delayed or harsh shifting: A worn outer clutch disk causes hesitation when engaging gears, often accompanied by a noticeable jolt or shudder during acceleration.
- Torque loss under load: If the disk surface is glazed or burnt, the transmission may slip when climbing grades or carrying heavy payloads, resulting in reduced power delivery.
- Metallic debris in transmission fluid: Friction material shedding from a degraded disk contaminates the oil, visible as dark particles on the dipstick or during a drain.
- Overheating transmission: Excessive slipping generates heat, triggering warning lights or a burnt odor from the vent, indicating the disk can no longer maintain proper clamping force.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.212.373 |
| Outer Diameter | ~210 mm (estimated) |
| Inner Diameter | ~140 mm (estimated) |
| Thickness | ~2.5 mm (new) |
| Material | Sintered bronze on steel core |
| Weight | ~0.35 kg |
| OEM Reference | ZF 0501.212.373 |
| Friction Surface | Grooved pattern for oil flow |
Compatibility
This outer clutch disk is designed for ZF WG-series transmissions, specifically the WG115, WG130, WG131, WG160, WG171, WG190, WG191, WG210, WG211, and WG230 models. It also fits BP 210 and BP 230 series units. The part is commonly used in the clutch pack for forward or reverse gears. For proper installation, ensure the HOUS.FRONT SECT and HOUSING REAR PART are free of scoring. In some WG variants, the HOUSING REAR PART (alternate casting) may also be used. Always verify spline count and stack height against your original disk before assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101032 | TRANSMISSION HOUSING | Main structural case enclosing clutch packs |
| 4656201075 | HOUS.FRONT SECT | Front section supporting input shaft bearings |
| 4656201034 | HOUSING REAR PART | Rear section housing output shaft assembly |
| 4472239177 | HOUSING REAR PART | Alternate rear housing for specific WG models |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing doweling |
| 0636100817 | CAP SCREW | Fastener for clutch pack retention |
| 4656301016 | SCREEN SHEET | Filter screen for oil return circuit |
| 4656301017 | SCREEN SHEET | Alternate filter screen for high-flow systems |
| 0636100803 | CAP SCREW | Bolt for housing flange connection |
| 4681301040 | OIL FEED.HOUSG. | Oil distribution manifold for clutch lubrication |
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