Overview
The ZF 4644.309.062 BRAKE DISC is a critical friction component engineered specifically for the WG 200 Series powershift transmission. This OEM genuine part sits within the clutch pack assembly, where it manages torque transfer and provides controlled deceleration during gear shifts. As a wear-and-tear item, the 4644.309.062 ensures smooth engagement and disengagement of planetary gearsets, directly influencing operational efficiency in heavy-duty industrial vehicles. Precision-machined to ZF’s exacting tolerances, this brake disc is essential for maintaining hydraulic pressure integrity within the rotating clutch drum.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn friction material causes hesitation when shifting from neutral to drive, often accompanied by a noticeable jolt.
- Transmission overheating: Excessive slippage from a glazed or thinned brake disc generates abnormal heat, triggering warning lights or fluid degradation.
- Metallic grinding noise during operation: As the disc wears past its service limit, steel-on-steel contact produces a distinct scraping sound, particularly under load.
- Inconsistent clutch pack pressure: A failing disc leads to erratic hydraulic feedback, causing intermittent power loss or unintended gear slip during uphill travel.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.309.062 |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Thickness (New) | 4.5 mm (estimated) |
| Material | Sintered bronze friction lining on steel core |
| Weight | 0.85 kg (estimated) |
| OEM Reference | ZF 4644.309.062 |
| Surface Finish | Ground and balanced |
Compatibility
This brake disc is primarily designed for the ZF WG 200 Series transmission family, including models such as WG180, WG200, and WG210. It is also compatible with select variants of the WG 150 Series when used in identical clutch pack configurations. Always verify the spline count and stack height against your transmission’s service manual. The disc interfaces directly with the TRANSMISSION HOUSING (4644101212) and the TRANSMISSION HOUSING (4644301221), which enclose the clutch assembly. For proper identification, the TYPE PLATE (0730365067) should be cross-referenced, and the GROOVED STUD (0631311009) secures the disc stack during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101212 | TRANSMISSION HOUSING | Encloses clutch and gear assembly |
| 4644301221 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Secures brake disc stack alignment |
| 4644303060 | COVER PLATE | Seals clutch pack housing |
| 4644303061 | COVER PLATE | Alternate cover plate for deep sump |
| 4644221031 | SCREEN TUBE | Filters hydraulic fluid to clutch pack |
| 0634306531 | O-RING | Seals housing joint (large) |
| 0634306525 | O-RING | Seals housing joint (small) |
| 0636305026 | SCREW PLUG | Closes hydraulic test ports |
