Overview
The ZF 4657.055.303 5 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 module within the WG 210 series, integrating the torque converter, planetary gear sets, and hydraulic clutch packs into a single sealed housing. As a complete unit, the SKU 4657.055.303 eliminates the need for piecemeal rebuilding, ensuring precise gear engagement under high-load conditions in wheel loaders, dozers, and industrial tractors. This assembly directly replaces worn or failed transmissions to restore original ZF performance specifications.
Symptoms of Failure
- Delayed or harsh gear engagement: When the internal clutch packs or hydraulic circuits degrade, operators experience a noticeable lag between shifting commands and actual gear changes, often accompanied by a jarring engagement.
- Low hydraulic pressure and overheating: Worn seals or internal leakage within the 4657.055.303 assembly cause the transmission to run hot, with pressure gauge readings dropping below 20 bar during operation.
- Oil contamination with metallic debris: As planetary gears or bearings fail, fine metal particles appear in the transmission fluid, visible during routine drain intervals and indicating imminent internal failure.
- Intermittent power loss under load: The transmission may slip or lose torque transfer when climbing grades or pushing heavy material, a direct result of worn clutch friction discs or damaged valve bodies.
Technical Specifications
| Parameter | Specification |
|---|---|
| ZF Part Number | 4657.055.303 |
| Series | WG 210 (5-speed Powershift) |
| Dry Weight (approx.) | 285 kg (628 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF 4657.055.303 |
| Max Input Torque | 1,200 Nm |
| Hydraulic Pressure Range | 18–25 bar |
Compatibility
This complete unit is engineered for the ZF WG 210 transmission series, which includes the WG180, WG200, and WG210 models commonly found in 10–18 ton wheel loaders and telehandlers. The 4657.055.303 assembly is also backward-compatible with select WG 160 variants when paired with the correct HOUS.FRONT SECT (4657201161) adapter. For secure mounting, always use the specified 螺栓 (0636115293) fasteners to maintain proper clamping force. Hydraulic integrity depends on replacing the O-RING (0634313603) during installation, while alignment is ensured by the CYLINDRICAL PIN (0631306816) that indexes the housing sections precisely.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657201161 | HOUS.FRONT SECT | Front housing section for torque converter mounting |
| 0636115293 | 螺栓 | High-strength bolt for housing assembly |
| 0634313603 | O-RING | Hydraulic seal between housing sections |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing fit |
| 0636100801 | CAP SCREW | Fastener for valve body attachment |
| 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 oil pan retention |
| 4656301047 | OIL FEED.HOUSG. | Lubrication supply housing for gears |
