Overview
The ZF 4657.056.091 6 WG 210 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 210 series, this complete unit integrates the torque converter, planetary gear sets, and clutch packs into a single, ready-to-install package. The SKU 4657.056.091 serves as the direct replacement for original equipment transmissions in loaders, graders, and industrial tractors. This assembly sits at the heart of the driveline, managing power distribution from the engine to the output shaft. For accurate vehicle speed monitoring, this unit is paired with the 4657107003: SPEEDOMETER, which must be verified for compatibility during installation.
Symptoms of Failure
- Delayed or harsh gear engagement: When the internal clutch packs or valve body wear, operators experience a noticeable lag or a jarring shift when moving from neutral to forward or reverse.
- Torque converter shudder under load: A vibration or shudder during acceleration, particularly at low speeds, indicates internal wear within the stator or turbine assembly of this powershift unit.
- External hydraulic fluid leaks: Cracks or seal failures in the main casing often present as drips near the bell housing or output flange. Inspect the 4657101039: TRANSMISSION HOUSING and the 4657201028: HOUS.FRONT SECT for stress fractures.
- Loss of power in higher gears: Slipping in 4th, 5th, or 6th gear suggests worn friction discs or a failing piston seal within the rear section, often requiring inspection of the 4657201013: HOUSING REAR PART.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.056.091 |
| Series | WG 210 (6 WG 210) |
| Type | Powershift Transmission Assembly (Complete Unit) |
| 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) |
| Input Torque Capacity | 900 Nm (peak) |
| Number of Speeds | 6 Forward / 3 Reverse |
| OEM Reference | ZF 4657 056 091 |
Compatibility
This complete unit is specifically engineered for the ZF WG 210 series powershift transmissions. It is directly compatible with models including the WG 180, WG 200, and WG 210 variants used in construction and agricultural machinery. The assembly also fits select applications in the WG 150 series with adapter modifications. Always cross-reference your existing transmission model tag to confirm the 4657.056.091 matches your housing configuration, particularly when replacing the 4657201013: HOUSING REAR PART which varies by gear ratio.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657107003 | SPEEDOMETER | Vehicle speed sensor drive for output shaft monitoring |
| 4657101039 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4657201028 | HOUS.FRONT SECT | Front section housing for torque converter and pump drive |
| 4657201013 | HOUSING REAR PART | Rear section housing for output shaft and planetary gears |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 bolt for securing housing sections |
| 4656301148 | FIXING PLATE | Retaining plate for clutch piston assembly |
| 4657301034 | SCREEN SHEET | Fine mesh filter for hydraulic circuit (inner) |
| 4657301035 | SCREEN SHEET | Fine mesh filter for hydraulic circuit (outer) |
| 0636100803 | CAP SCREW | M12 bolt for rear housing attachment |
