Overview
The ZF 4657.026.114 6 WG 190 Powershift Transmission Assembly is a complete, factory-grade unit designed for heavy-duty off-highway machinery. This assembly integrates the full gear train, clutch packs, and hydraulic control system within a robust casing. As a direct replacement for the WG 190 series, the SKU 4657.026.114 ensures seamless integration into existing drivelines, restoring original performance in loaders, dozers, and graders. The unit sits at the core of the powertrain, transferring engine torque to the final drives through six forward speeds. For structural integrity, this assembly relies on the 4657101082: TRANSMISSION HOUSING to contain internal pressures, while the 4657201166: HOUS.FRONT SECT and 4657201170: HOUSING REAR PART provide precise alignment for the output shaft.
Symptoms of Failure
When the ZF 4657.026.114 assembly begins to degrade, operators often notice specific performance issues. Delayed engagement or gear slipping under load is a primary indicator, typically caused by worn clutch discs or degraded seals within the unit. Another common symptom is external oil leaks around the main housing joints, which can lead to low fluid levels and overheating. You may also experience erratic shifting or harsh engagement between forward and reverse gears, signaling internal hydraulic pressure loss. Finally, unusual whining or grinding noises from the transmission case often point to bearing fatigue or gear tooth damage inside the assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.026.114 |
| Series | WG 190 (6 WG 190) |
| Type | Powershift Transmission Assembly (Complete Unit) |
| Estimated Weight | 385 kg (849 lbs) |
| Housing Material | High-Grade Cast Iron |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Input Spline Count | 14 (SAE standard) |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This complete unit is engineered specifically for the ZF WG 190 series of powershift transmissions. It is a direct fit for models including the WG 180, WG 190, and WG 200 variants used in construction and agricultural equipment. The assembly also supports the 6 WG 190 designation, which indicates a six-speed forward configuration. For auxiliary support, the 4657298102: HOUSING REAR SECTION is often required when servicing the output flange area. Always verify your transmission model tag before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4657201170 | HOUSING REAR PART | Rear casing supporting output shaft bearings |
| 4657298102 | HOUSING REAR SECTION | Extended rear cover for PTO or flange mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Locking plate for clutch piston retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump return line |
| 0636100803 | CAP SCREW | High-tensile bolt for final drive attachment |
