Overview
The ZF 4657.056.021 6 WG 210 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control elements into a single drop-in replacement. As the core power transfer module in the WG 210 series, it directly governs torque distribution and shift timing. The SKU 4657.056.021 identifies the complete assembly, which is often ordered alongside the 4657101033: TRANSMISSION HOUSING to ensure proper alignment of internal components.
Symptoms of Failure
- Erratic or delayed shifting under load: Worn clutch discs or valve body wear within the assembly cause hesitation between forward and reverse gears, especially during high-torque maneuvers.
- Internal oil leaks and low hydraulic pressure: Degraded seals or cracked housing sections lead to fluid loss around the 4657201027: HOUS.FRONT SECT, resulting in sluggish engagement and overheating.
- Metallic grinding or whining noise: Bearing fatigue or gear tooth spalling inside the assembly produces audible distress, often accompanied by vibration in the driveline.
- Inability to hold gear on inclines: A failing assembly loses clamping force in the clutch packs, causing the vehicle to creep or roll back on slopes.
Technical Specifications
| Parameter | Value |
|---|---|
| Assembly Weight | ~185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4657.056.021 |
| Torque Capacity | 2,100 Nm (max) |
| Wet Weight (with oil) | ~210 kg |
Compatibility
This complete assembly is engineered for the ZF WG 210 transmission series. It is also directly compatible with the WG 180 and WG 200 series when used with the appropriate 4657201012: HOUSING REAR PART adapter. The unit fits loaders, graders, and compactors from manufacturers such as Caterpillar, Volvo, and JCB that utilize ZF powershift platforms. Always verify the 0631306792: CYLINDRICAL PIN alignment before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201027 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4657201012 | HOUSING REAR PART | Rear section supporting output flange |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | Fastener for housing bolt pattern |
| 4656301148 | FIXING PLATE | Retainer for clutch pack assembly |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for oil sump |
| 0636100803 | CAP SCREW | Bolt for valve body mounting |
| 4681301040 | OIL FEED.HOUSG. | Pressurized oil distribution manifold |
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