Overview
The ZF 4657.066.019 6 WG 211 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the clutch packs, planetary gear sets, and hydraulic control system into a single, ready-to-install package. As the core of the WG 211 series, it replaces the entire rotating assembly and valve body, eliminating the need for piecemeal repairs. The SKU 4657.066.019 identifies this as a complete unit, distinct from sub-assemblies like the 4657101049: TRANSMISSION HOUSING which encloses the lower section. This assembly sits between the torque converter and the output flange, managing all power flow and gear ratio changes in the drivetrain.
Symptoms of Failure
- Delayed or harsh engagement: When the internal clutch packs wear, you will notice a significant lag when shifting from neutral to forward or reverse, often accompanied by a jarring engagement. This is a classic sign of low hydraulic pressure or worn friction discs within the 4657.066.019 unit.
- Erratic gear slipping under load: If the transmission suddenly loses power or the engine revs without corresponding vehicle movement during a grade climb, the internal seals or pistons have failed. This symptom typically worsens as the transmission oil temperature rises.
- Metallic grinding or whining noise: A high-pitched whine from the center housing, especially in 3rd or 4th gear, indicates bearing failure or gear tooth damage inside the assembly. This is often accompanied by metal particles in the oil filter.
- External oil leaks at the split line: Oil weeping from the seam between the front and rear sections suggests a failed gasket or a cracked 4657301130: HOUS.FRONT SECT or 4657301131: HOUSING REAR PART. This leak path is common when the 0631306816: CYLINDRICAL PIN alignment dowels are worn, causing misalignment.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.066.019 |
| Assembly Type | Complete Powershift Unit (6 WG 211) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-Strength Aluminum Alloy |
| Clutch Disc Material | Sintered Bronze on Steel |
| OEM Reference | ZF 4657.066.019 (Direct Replacement) |
| Bolt Torque (Main Housing) | 85 Nm (63 ft-lbs) |
Compatibility
This complete assembly is specifically engineered for the ZF WG 211 series transmissions. It is a direct fit for models including the WG 211, WG 211 II, and WG 211 III used in wheel loaders, telehandlers, and industrial tractors. While the WG 180 and WG 200 series share some internal components like the 0636102489: CAP SCREW and 4656301148: FIXING PLATE, the 4657.066.019 unit is not interchangeable with those smaller series due to different clutch pack counts and output shaft splines. Always verify your transmission model tag before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Encloses the lower gear set and sump area |
| 4657301130 | HOUS.FRONT SECT | Front section housing the input shaft and pump drive |
| 4657301131 | HOUSING REAR PART | Rear section supporting the output flange and PTO |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing split-line accuracy |
| 0636102489 | CAP SCREW | M12 bolt for securing the front housing to the main case |
| 4656301148 | FIXING PLATE | Locks the output flange nut to prevent loosening |
| 0636102463 | CAP SCREW | M10 bolt for the valve body mounting bracket |
| 4657201133 | SCREEN SHEET | Fine mesh filter protecting the clutch control valves |
| 0636115287 | CAP SCREW | M8 bolt for the oil pan and screen cover |
| 4657301065 | PLATE | Thrust washer for the planetary gear carrier |
