Overview
The ZF 4657.084.105 4 WG 230 Powershift Transmission Assembly is a complete, factory-grade unit designed for heavy-duty off-highway machinery. As the core power transfer module in the WG 230 series, this assembly integrates the torque converter, planetary gear sets, and hydraulic clutch packs into a single, ready-to-install package. The SKU 4657.084.105 specifically denotes a fully assembled 4-speed powershift unit, replacing the need for individual component rebuilds. It sits directly between the engine flywheel housing and the final drive, managing all gear ratio changes under load. For a complete installation, this unit must be paired with a robust TRANSMISSION HOUSING to ensure proper alignment and oil containment.
Symptoms of Failure
When the ZF 4657.084.105 assembly begins to fail, operators typically notice these specific performance issues:
- Erratic or delayed shifting under load: The transmission hesitates or slams into gear when moving heavy materials, indicating worn clutch discs or hydraulic pressure loss.
- Torque converter shudder at low RPM: A vibration felt through the drivetrain when creeping forward, often caused by degraded stator bearings within the assembly.
- External oil leaks from the main housing seam: Puddles of ATF forming under the bell housing, frequently traced back to a cracked HOUS.FRONT SECT or a failed gasket on the HOUSING REAR PART.
- Metal debris in the transmission fluid: Shiny particles found during routine oil changes, signaling internal gear or bearing failure that requires immediate replacement of the complete unit.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4657.084.105 |
| Assembly Type | 4 WG 230 Powershift (Complete Unit) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | 2,300 Nm |
| Oil Capacity | 22 liters (SAE 10W-30) |
| Bolt Torque (housing) | 120 Nm (M12 grade 10.9) |
| OEM Reference | ZF 4WG-230 |
Compatibility
This 4657.084.105 assembly is engineered specifically for the ZF WG 230 Series of powershift transmissions. It is directly compatible with models including the WG180, WG200, and WG230 found in articulated dump trucks, wheel loaders, and graders from manufacturers like Liebherr, Volvo, and Caterpillar. The unit also fits the 4WG-230 variant used in agricultural tractors. When installing, always inspect the HOUSING REAR SECTION for wear, as it directly mates with this assembly’s output flange.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section supporting torque converter |
| 4657201168 | HOUSING REAR PART | Rear section for output shaft support |
| 4657298101 | HOUSING REAR SECTION | Extended rear cover for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636100801 | CAP SCREW | M12 bolt for housing fastening |
| 4656301148 | FIXING PLATE | Locks bearing in place |
| 4657301032 | SCREEN SHEET | Fine mesh oil filter (inner) |
| 4657301033 | SCREEN SHEET | Coarse mesh oil filter (outer) |
| 0636100803 | CAP SCREW | M10 bolt for filter cover |
