Overview
The ZF 4657.056.155 6 WG 210 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly serves as the central power transfer and gear selection module within the WG 210 series, integrating the torque converter, planetary gear sets, and hydraulic control system into a single, ready-to-install package. As a complete unit, the SKU 4657.056.155 eliminates the need for piecemeal rebuilding, ensuring precise alignment of all internal components. It directly interfaces with the TRANSMISSION HOUSING to form the structural backbone of the drivetrain, and it is sealed by the HOUS.FRONT SECT and HOUSING REAR PART to maintain oil integrity under high load.
Symptoms of Failure
- Delayed or harsh gear engagement: When the complete unit wears internally, operators often report a noticeable lag or a jarring “clunk” when shifting between forward and reverse, indicating worn clutch packs or valve body issues.
- Chronic oil overheating and foaming: A failing assembly can cause excessive internal slippage, leading to transmission fluid temperatures rising above 120°C (248°F) and visible aeration in the dipstick tube.
- Intermittent loss of drive under load: As internal seals and pistons degrade, the transmission may suddenly lose power to the wheels when climbing grades or pushing heavy loads, only to regain function after cooling.
- External seepage at housing joints: Cracks or warpage in the main assembly can cause oil to weep from the mating surfaces where the HOUSING REAR SECTION bolts to the main body, leaving visible drips on the bell housing.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.056.155 |
| Assembly Type | Complete Powershift Unit (6-speed) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| Max Input Torque | 1,200 Nm |
| Fluid Capacity | 22 Liters (5.8 Gallons) |
| OEM Reference | ZF 6 WG 210 |
Compatibility
This complete assembly is engineered specifically for the ZF WG 210 series transmissions. It is a direct fit for models including the WG180, WG200, and WG210, commonly found in telescopic handlers, wheel loaders, and rough-terrain forklifts. The unit is also backward-compatible with certain WG160 variants when used with the correct CYLINDRICAL PIN alignment kit. For installations requiring additional structural support, verify the condition of the FIXING PLATE and the SCREEN SHEET (fine mesh) to prevent debris from entering the valve body.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing for torque converter |
| 4657201170 | HOUSING REAR PART | Rear cover for output shaft support |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M12 bolt for housing fastening |
| 4656301148 | FIXING PLATE | Retainer for clutch piston assembly |
| 4657301032 | SCREEN SHEET | Fine mesh filter (0.5mm openings) |
| 4657301033 | SCREEN SHEET | Coarse mesh filter (1.0mm openings) |
| 0636100803 | CAP SCREW | M16 bolt for rear housing |
