Overview
The ZF 4646.298.913 PORTA DISCO, an original OEM component, serves as the critical clutch disc carrier or hub assembly within the planetary gear sets of ZF WG-series transmissions. This part directly supports the friction discs and steel plates, ensuring precise torque transfer and smooth gear engagement under heavy loads. Specifically designed for construction machinery applications, the SKU 4646.298.913 interfaces with the main TRANSMISSION HOUSING to maintain correct axial alignment. When installed alongside the COVER, it creates a sealed clutch pack chamber that withstands high hydraulic pressures. This hub is machined from high-strength alloy steel to resist spline wear and thermal distortion during continuous operation in excavators and wheel loaders.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn splines on the 4646.298.913 cause the clutch discs to bind, resulting in jerky shifts or hesitation when selecting forward or reverse.
- Metallic grinding noise from transmission: As the hub surface degrades, metal-to-metal contact between the carrier and friction discs produces a distinct grinding sound during acceleration.
- Progressive loss of drive power: Internal slippage occurs when the hub can no longer hold the clutch pack securely, leading to reduced torque delivery under load—common in WG311 units operating in heavy earthmoving.
- Hydraulic fluid contamination: Cracks in the hub allow pressurized oil to bypass the clutch piston, causing overheating and darkening of the transmission fluid.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.298.913 |
| Material | Forged alloy steel (induction-hardened splines) |
| Outer Diameter | 198 mm |
| Inner Spline Diameter | 38 mm |
| Overall Height | 72 mm |
| Weight | 2.85 kg |
| OEM Reference | ZF 4646.298.913 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This PORTA DISCO is engineered for ZF WG-series powershift transmissions used in construction machinery. It is a direct fit for the WG311 model and is also compatible with WG180, WG200, and WG250 transmissions when used in the forward clutch pack position. Always verify the spline count and hub depth against your transmission’s service manual. For proper installation, secure the hub using the 螺栓 (part 0636115293) and the 螺栓 (part 0736300232) to the output shaft flange. This hub does not fit ZF Ecomat or AS Tronic series units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101173 | TRANSMISSION HOUSING | Encloses the gear train and supports the hub assembly |
| 4646301349 | COVER | Seals the clutch pack chamber and guides hydraulic flow |
| 0636115293 | 螺栓 | M10 mounting bolt for securing the hub to the shaft |
| 0736300232 | 螺栓 | M12 flange bolt for cover attachment |
| 4475280208 | SCREW PLUG | Seals hydraulic test ports in the housing |
| 0634316523 | O-RING | Prevents oil leakage between hub and piston |
| 0630361026 | SEALING CAP | Protects the hub’s center bore from debris |
| 0501214611 | 齿轮泵 | Supplies hydraulic pressure to engage the clutch pack |
| 0634313945 | O形圈 | Seals the cover-to-housing interface |
| 0501322532 | TEMPERATURE SENSOR | Monitors oil temperature near the clutch hub |
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