Overview
The ZF 4657.056.039 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 unit integrates the torque converter, planetary gear sets, and clutch packs into a single, ready-to-install package. The SKU 4657.056.039 identifies a fully assembled powershift transmission that replaces worn or failed units in wheel loaders, forklifts, and industrial tractors. This assembly sits directly between the engine flywheel and the final drive, managing power flow through six forward and three reverse speeds. For proper installation, the unit mates with the TRANSMISSION HOUSING to ensure correct alignment and oil circulation.
Symptoms of Failure
- Delayed engagement or gear slipping under load: When the internal clutch packs or seals degrade, the transmission hesitates before engaging forward or reverse, or it slips during heavy lifting, indicating internal pressure loss.
- External oil leaks from the main case: Cracks or worn gaskets in the assembly cause hydraulic fluid to weep from the bell housing or side covers, often visible as drips after shutdown.
- Unusual grinding or whining noises during shifts: Worn bearings or damaged planetary gears produce metallic sounds, especially when shifting between 2nd and 3rd gear, signaling imminent internal failure.
- Overheating and erratic shift patterns: A failing torque converter or blocked oil passages cause the transmission to run hot, with harsh or missed shifts that worsen as the unit warms up.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4657.056.039 |
| Assembly Type | Complete Powershift Transmission Unit (6 WG 210) |
| Overall Length | Approx. 720 mm |
| Dry Weight | ~185 kg (408 lbs) |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 6 WG 210 |
| Max Input Torque | 1,200 Nm |
| Oil Capacity | 12.5 liters (ATF Dexron III) |
Compatibility
This complete assembly is engineered for the ZF WG 210 series and is directly compatible with WG 180, WG 200, and WG 211 variants when used with the correct adapter kit. It fits wheel loaders from manufacturers such as Liebherr, Volvo, and Caterpillar that originally specified a ZF 6-speed powershift. The unit requires the HOUS.FRONT SECT and HOUSING REAR PART to complete the structural enclosure. Additionally, the CYLINDRICAL PIN is essential for aligning the assembly during installation. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural case for gear and shaft support |
| 4657201027 | HOUS.FRONT SECT | Front section housing the torque converter |
| 4657201012 | HOUSING REAR PART | Rear section covering output shaft and PTO |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Locking plate for clutch pack retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit protection |
| 4657301033 | SCREEN SHEET | Secondary filter screen for return line |
| 0636100803 | CAP SCREW | Bolt for valve body mounting |
| 4681301040 | OIL FEED.HOUSG. | Pressurized oil supply housing for lubrication |
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