Overview
The ZF 4657.026.111 6 WG 190 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single ready-to-install package. As the core of the WG 190 series, it manages torque distribution across six forward speeds and one reverse, enabling smooth power shifts under load. The SKU 4657.026.111 is a direct OEM replacement, ensuring precise fitment within the transmission housing. For a full rebuild, this unit is typically paired with the 4657101080: TRANSMISSION HOUSING to complete the main casing assembly.
Symptoms of Failure
- Erratic gear engagement or slipping under load: Worn clutch discs or hydraulic seal degradation inside the 4657.026.111 cause delayed or incomplete shifts, especially when moving from neutral to drive.
- Internal hydraulic pressure loss: A failing assembly often leads to low system pressure, resulting in sluggish power take-off or inability to hold gear on inclines.
- Metallic debris in transmission fluid: Bearing or gear spalling within the unit produces fine metal particles, visible during oil changes, indicating imminent internal failure.
- Audible whining or grinding from the bell housing: Worn input shaft bearings or damaged planetary gears create distinct noise that worsens with engine RPM.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.026.111 |
| Assembly Type | 6 WG 190 Powershift Transmission (Complete Unit) |
| Weight (approx.) | 185 kg (408 lbs) |
| Dimensions (L x W x H) | 620 mm x 480 mm x 520 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | 1,900 Nm |
| Fluid Capacity | 14.5 liters (SAE 10W-30) |
| Related Fasteners | 0636100801: CAP SCREW, 0636100803: CAP SCREW |
| Alignment Components | 0631306816: CYLINDRICAL PIN, 4656301148: FIXING PLATE |
Compatibility
This 6 WG 190 assembly is engineered for ZF’s WG 190 series powershift transmissions, commonly found in wheel loaders, forklifts, and telehandlers. It is directly compatible with WG 180, WG 190, and WG 200 models, as the core internal architecture is shared across these variants. The unit interfaces with the 4657201167: HOUS.FRONT SECT and 4657201171: HOUSING REAR PART to form the complete transmission casing. For extended configurations, the 4657298103: HOUSING REAR SECTION may be required for auxiliary PTO mounting. Always verify your transmission serial number against ZF application charts before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101080 | TRANSMISSION HOUSING | Main casing for gear and clutch assembly |
| 4657201167 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4657201171 | HOUSING REAR PART | Rear housing segment for output shaft support |
| 4657298103 | HOUSING REAR SECTION | Extended rear housing for PTO adapters |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M12 bolt for housing flange fastening |
| 4656301148 | FIXING PLATE | Retaining plate for clutch pack alignment |
| 4657301034 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter for oil intake |
| 0636100803 | CAP SCREW | M10 bolt for accessory mounting |
