Overview
The ZF 4644.311.015 DRIVER is a critical rotational component within the WG200 series powershift transmission. This OEM genuine part functions as the primary input drive hub, transferring torque from the engine directly into the transmission’s planetary gearset. Positioned on the main shaft assembly, the 4644.311.015 ensures precise engagement and disengagement of clutch packs during gear changes. For operators maintaining heavy-duty ZF drivelines, this SKU is a direct replacement for worn factory-installed units, guaranteeing original fitment and load-bearing capacity.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: When the 4644.311.015 driver wears, the splines can strip, causing the transmission to hesitate or fail to engage specific gears under load.
- Metallic grinding noise from the bell housing: A worn driver often produces a distinct grinding or clattering sound, especially during acceleration or deceleration, indicating internal spline wear.
- Transmission oil contamination with metallic particles: As the driver surface degrades, fine metal shavings enter the hydraulic circuit, leading to clogged filters and valve body damage.
- Intermittent loss of power to the wheels: A failing driver can slip under torque, resulting in a sudden loss of drive power without any warning lights or error codes.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.311.015 |
| Material | Case-hardened alloy steel |
| Weight | 2.85 kg (6.28 lbs) |
| Outer Diameter | 112 mm |
| Internal Spline Count | 24-tooth, SAE standard |
| OEM Reference | ZF 4644.311.015 |
| Surface Treatment | Black oxide corrosion resistance |
Compatibility
This genuine ZF driver is engineered specifically for the WG200 series transmission family. It is a direct fit for models including the WG180, WG200, and WG210. The part is also compatible with certain ZF Ecomat variants that share the same input shaft architecture. Always verify your transmission serial number against the 4644.311.015 specification before ordering. For complete assembly, this driver works in conjunction with the 4644101222: TRANSMISSION HOUSING and the 4644301226: TRANSMISSION HOUSING to maintain proper shaft alignment.
During installation, ensure the 0730365067: TYPE PLATE is correctly affixed for identification, and secure the assembly using the 0631311009: GROOVED STUD to prevent axial movement. These components are essential for long-term reliability in high-torque applications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101222 | TRANSMISSION HOUSING | Main structural casing for gearset |
| 4644301226 | TRANSMISSION HOUSING | Rear housing for output shaft support |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Fastener for driver retention |
| 4644301298 | COVER PLATE | Seals access port to driver area |
| 0634306525 | O-RING | Hydraulic seal for pressure integrity |
| 0636305026 | SCREW PLUG | Oil drain or fill port closure |
| 4475280078 | ADAPTER | Interface between driver and pump |
| 4644301279 | SCREEN SHEET | Filter mesh for oil debris protection |
| 4644301088 | SEALING CAP | Protects driver spline during storage |
