Overview
The ZF 4657.026.110 6 WG 190 Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty off-highway machinery. This core assembly integrates the main gear set, clutch packs, and hydraulic control system within a single, ready-to-install package. As a direct replacement for the WG 190 series, the SKU 4657.026.110 serves as the central power transfer component, converting engine torque into controlled, multi-speed output for loaders, graders, and industrial vehicles. It is typically mounted between the engine bell housing and the final drive, requiring precise alignment with the 4657101082: TRANSMISSION HOUSING to ensure proper sealing and structural integrity.
Symptoms of Failure
- Delayed or harsh gear engagement: When the assembly wears, internal clutch pack clearances increase, causing a noticeable lag or jarring shift between forward and reverse ranges.
- Internal oil leaks and pressure loss: Cracks in the main casing or degraded seals around the 4657201166: HOUS.FRONT SECT can lead to low hydraulic pressure, resulting in slipping under load.
- Unusual whining or grinding noises: Worn bearings or damaged planetary gears within the 6 WG 190 produce a high-pitched whine during acceleration, often worsening with temperature.
- Overheating transmission fluid: A failing torque converter or blocked internal passages cause rapid fluid degradation, indicated by burnt smell and erratic shift patterns.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4657.026.110 |
| Assembly Type | Complete Powershift Transmission |
| Series | WG 190 (6-Speed) |
| Dry Weight (approx.) | 285 kg (628 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Primary Material | Cast Iron Housing / Steel Gears |
| OEM Reference | ZF 6 WG 190 |
| Torque Capacity (max) | 1,900 Nm |
Compatibility
This complete unit is engineered for the ZF WG 190 series transmission family. It is directly compatible with models including the WG 180, WG 190, and WG 200 when used as a full assembly replacement. The unit also interfaces with the 4657201170: HOUSING REAR PART and the 4657298102: HOUSING REAR SECTION for final drive attachment. It is commonly found in ZF 6WG-190 powershift applications used in Volvo, Case, and Caterpillar wheel loaders from the 2000s era.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201166 | HOUS.FRONT SECT | Front section housing torque converter |
| 4657201170 | HOUSING REAR PART | Rear casing for output shaft support |
| 4657298102 | HOUSING REAR SECTION | Extended rear section for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | Fastener for front housing attachment |
| 4656301148 | FIXING PLATE | Locks clutch pack retaining nuts |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil sump |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for pump |
| 0636100803 | CAP SCREW | Fastener for rear housing section |
