Overview
The ZF 4646.298.909 PORTADISCOS (clutch disc carrier) is a critical internal component engineered specifically for the WG260 series powershift transmission. This OEM original part functions as the central hub that houses and aligns the clutch disc packs, ensuring precise torque transfer during gear engagement. Positioned within the main transmission housing, the 4646.298.909 carrier interfaces directly with the TRANSMISSION HOUSING (4646101173) and the COVER (4646301349) to maintain proper clutch pack clearance. Without this carrier, the clutch discs cannot maintain correct axial positioning, leading to immediate drivability issues.
Symptoms of Failure
- Erratic gear engagement or delayed shifting — A worn or cracked carrier allows clutch discs to shift out of alignment, causing hesitation when shifting between forward and reverse gears.
- Metallic grinding noises from transmission — As the carrier splines wear, the disc packs can make intermittent contact with the housing, producing a distinct grinding sound during operation.
- Transmission oil contamination with metal particles — Carrier fatigue generates fine metallic debris that circulates through the hydraulic system, often detected during routine oil analysis.
- Complete loss of drive in specific gears — Severe carrier failure prevents the clutch pack from compressing fully, resulting in a no-drive condition that mimics clutch slippage.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4646.298.909 |
| Material | High-strength nodular cast iron (GGG-40) |
| Outer Diameter | 298 mm |
| Inner Spline Diameter | 90 mm |
| Overall Height | 65 mm |
| Weight | 4.2 kg |
| Surface Treatment | Phosphate coating for corrosion resistance |
| Hardness | 180-220 HB |
Compatibility
This PORTADISCOS is designed exclusively for ZF WG260 series transmissions, commonly found in construction machinery such as wheel loaders, graders, and compactors. While the WG260 is the primary application, the 4646.298.909 carrier may also be compatible with select WG180 and WG200 variants that share the same clutch pack architecture. Always verify spline count and carrier height against your existing unit. The carrier is secured using 螺栓 (0636115293) and 螺栓 (0736300232) for proper clamping force.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101173 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4646301349 | COVER | Seals and protects clutch pack assembly |
| 0636115293 | 螺栓 | Fastener for carrier-to-hub connection |
| 0736300232 | 螺栓 | Secondary fastener for cover retention |
| 4475280208 | SCREW PLUG | Seals hydraulic passages in housing |
| 0634316523 | O-RING | Prevents oil leaks between components |
| 0630361026 | SEALING CAP | Covers unused ports against contamination |
| 0501214611 | 齿轮泵 | Hydraulic pump for clutch actuation |
| 0634313945 | O形圈 | Seals pump-to-housing interface |
| 0501322532 | TEMPERATURE SENSOR | Monitors transmission oil temperature |
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