Overview
The ZF 4657.056.076 6 WG 210 Powershift Transmission Assembly | Complete Unit is a fully assembled, high-capacity powershift gearbox designed for heavy-duty off-highway machinery. This complete unit integrates all internal rotating components, clutches, and hydraulic control elements within a robust housing, serving as the primary power transfer module in articulated dump trucks, wheel loaders, and graders. The SKU 4657.056.076 identifies a factory-matched assembly that replaces the entire transmission core, eliminating the need for piecemeal rebuilds. It sits directly between the engine flywheel and the final drive, managing torque distribution across six forward and three reverse speeds. For optimal structural integrity, this unit mates with the 4657101050: TRANSMISSION HOUSING and the 4657201028: HOUS.FRONT SECT, ensuring precise alignment of the gear train.
Symptoms of Failure
- Delayed engagement or gear slipping under load: Worn clutch packs or degraded seals inside the 4657.056.076 cause hesitation when shifting from neutral to forward, or slipping during uphill hauling.
- Low hydraulic pressure and erratic shifting: Internal leakage from the valve body or pump wear leads to pressure drops below 12 bar, resulting in harsh or missed shifts.
- Metallic debris in transmission oil: Bearing or gear spalling generates fine metal particles, often detected during oil analysis, indicating imminent internal failure of the complete unit.
- External oil seepage from bell housing area: Cracks in the 4657201013: HOUSING REAR PART or worn input shaft seals allow fluid to escape, reducing lubrication and causing overheating.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.056.076 |
| Transmission Series | WG 210 (6 WG 210) |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| Max Input Torque | 2,100 Nm |
| Oil Capacity | 28 liters (SAE 10W-30) |
| OEM Reference | ZF 4657.056.076 |
| Related Fastener | 0636100801: CAP SCREW |
| Related Fastener | 0636100803: CAP SCREW |
| Retention Component | 4656301148: FIXING PLATE |
| Filter Screen | 4657301034: SCREEN SHEET |
| Filter Screen (Alt) | 4657301035: SCREEN SHEET |
| Oil Supply Component | 4681301040: OIL FEED.HOUSG. |
Compatibility
This complete unit is engineered for the ZF WG 210 series, specifically the 6-speed variant (6 WG 210). It is also compatible with earlier WG 180 and WG 200 models when used with the appropriate adapter plates and the 0631306792: CYLINDRICAL PIN for dowel alignment. Applications include ZF transmissions found in Volvo A40D/E, Caterpillar 730, and Komatsu HM400 articulated trucks. Always verify the bell housing pattern and torque converter match before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101050 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4657201028 | HOUS.FRONT SECT | Front section housing input shaft and torque converter |
| 4657201013 | HOUSING REAR PART | Rear casing supporting output shaft and PTO drive |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636100801 | CAP SCREW | M12 fastener for housing bolt-up |
| 0636100803 | CAP SCREW | M14 fastener for high-torque joints |
| 4656301148 | FIXING PLATE | Locks clutch pack retaining nuts |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil sump |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter for hydraulic circuit |
| 4681301040 | OIL FEED.HOUSG. | Distributes pressurized oil to clutch packs |
