Overview
The ZF 4657.056.166 6 WG 210 Powershift Transmission Assembly | Complete Unit is a fully integrated, factory-built gearbox core designed for heavy-duty off-highway machinery. This complete unit serves as the central power distribution hub, converting engine torque into controlled, multi-speed output for wheel loaders, graders, and industrial tractors. The SKU 4657.056.166 identifies a complete assembly that includes the main casing, clutch packs, and planetary gear sets. In the WG 210 series, this assembly sits between the torque converter and the final drive, managing all forward and reverse gear shifts under load. For a full rebuild, the 4657101082: TRANSMISSION HOUSING provides the structural foundation, while the 4657201166: HOUS.FRONT SECT seals the front clutch area.
Symptoms of Failure
When the ZF 4657.056.166 assembly begins to fail, operators often notice delayed engagement when shifting from neutral to forward, a classic sign of internal clutch pack wear. Another common symptom is erratic or harsh shifting under load, which indicates worn planetary bearings or damaged seals. Oil leaks at the housing mating surfaces are frequently reported, particularly around the rear section, requiring inspection of the 4657201170: HOUSING REAR PART. Finally, loss of power in higher gears suggests internal pressure loss or worn friction discs, often traced to the 4657298102: HOUSING REAR SECTION.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.056.166 |
| Assembly Type | 6 WG 210 Powershift (Complete Unit) |
| Overall Length | ~720 mm (estimated) |
| Overall Width | ~480 mm (estimated) |
| Dry Weight | ~185 kg (estimated) |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | ~2100 Nm |
| Number of Speeds | 6 forward / 3 reverse |
| OEM Reference | ZF WG 210 Series |
| Related Fastener | 0636100801: CAP SCREW |
| Related Fastener | 0636100803: CAP SCREW |
| Related Pin | 0631306816: CYLINDRICAL PIN |
| Related Plate | 4656301148: FIXING PLATE |
| Related Screen | 4657301032: SCREEN SHEET |
| Related Screen | 4657301033: SCREEN SHEET |
Compatibility
This complete unit is specifically engineered for the ZF WG 210 series of powershift transmissions. It is directly compatible with models including the WG 180, WG 200, and WG 210 when used as a direct replacement assembly. The unit also fits select WG 160 variants with minor adapter modifications. It is commonly found in Case, New Holland, and Volvo wheel loaders and graders that utilize ZF drivetrains. Always verify your transmission model tag before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4657201166 | HOUS.FRONT SECT | Front section housing for clutch and pump drive |
| 4657201170 | HOUSING REAR PART | Rear casing section for output shaft support |
| 4657298102 | HOUSING REAR SECTION | Complete rear housing assembly for final drive |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 0636100801 | CAP SCREW | Fastener for front housing attachment |
| 0636100803 | CAP SCREW | Fastener for rear housing attachment |
| 4656301148 | FIXING PLATE | Retaining plate for internal bearing preload |
| 4657301032 | SCREEN SHEET | Oil filter screen for lubrication circuit |
| 4657301033 | SCREEN SHEET | Secondary oil filter screen for clutch feed |
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