Overview
The ZF 4657.085.004 5 WG 230 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. As the core hydraulic-mechanical assembly in the WG 230 series, this powershift transmission manages torque distribution across five forward speeds, enabling smooth clutch engagement under load. The SKU 4657.085.004 identifies a fully assembled unit that integrates the main gear train, clutch packs, and valve body into a single drop-in replacement. This assembly sits between the engine bellhousing and the final drive, directly coupling to the 4657101082: TRANSMISSION HOUSING to form the structural backbone of the drivetrain.
Symptoms of Failure
- Delayed or harsh shifting under load – Worn clutch discs or degraded seals within the assembly cause hesitation or jarring engagement, particularly in forward gears.
- Hydraulic oil leaks at housing seams – Cracks or gasket failure in the 4657201166: HOUS.FRONT SECT or 4657201170: HOUSING REAR PART allow pressurized ATF to escape, leading to low line pressure and eventual gear slip.
- Intermittent loss of drive in reverse – Internal wear in the planetary set or valve body spools prevents reverse clutch pack lockup, a common failure in high-hour units.
- Metallic grinding noise from the transmission center – Bearing failure or gear tooth spalling produces a distinct whine or grind, often accompanied by debris in the oil pan.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.085.004 |
| Assembly Type | Complete Powershift Transmission Unit |
| Series | WG 230 |
| Number of Speeds | 5 Forward / 1 Reverse |
| Dry Weight (approx.) | 285 kg (628 lbs) |
| Overall Length | 720 mm |
| Overall Width | 410 mm |
| Overall Height | 480 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4657.085.004 |
| Max Input Torque | 1,200 Nm |
| Fluid Capacity | 22 liters (ATF Dexron III) |
Compatibility
This complete assembly is engineered for the ZF WG 230 series, but its internal architecture shares core components with the WG 180 and WG 200 families. Specifically, the 4657.085.004 unit is a direct fit for ZF WG 230 transmissions used in loaders, graders, and industrial tractors from 2010 onward. It also retrofits into select WG 180 applications when paired with the correct 4657298102: HOUSING REAR SECTION adapter. Always verify bellhousing bolt patterns and input shaft spline count before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4657201170 | HOUSING REAR PART | Rear casing supporting output shaft bearings |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing dowel fitment |
| 0636100801 | CAP SCREW | M12 bolt for housing flange fastening |
| 4656301148 | FIXING PLATE | Locks clutch piston retaining ring |
| 4657301032 | SCREEN SHEET | Fine mesh filter for valve body oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump pickup |
| 0636100803 | CAP SCREW | M10 bolt for screen sheet retention |
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