Overview
The ZF 4657.026.306 6 WG 190 Powershift Transmission Assembly is a complete, factory-engineered unit designed for heavy-duty off-highway machinery. This fully assembled gearbox integrates the clutch packs, planetary gearsets, and hydraulic control system into a single, ready-to-install package. As a core component of the WG 190 series, this assembly replaces the need for piecemeal repairs, offering a direct OEM-grade solution for loaders, dozers, and graders. The SKU 4657.026.306 is specifically configured for 6-speed powershift applications, ensuring seamless power delivery under extreme loads. When installing this unit, always verify the integrity of the 4657201161: HOUS.FRONT SECT to guarantee proper alignment of the input shaft.
Symptoms of Failure
- Erratic gear engagement and slipping under load: Worn clutch discs or degraded seals within the assembly cause the transmission to hesitate or slip when shifting between forward and reverse gears, especially during high-torque operations.
- External oil leaks at the front housing interface: Deterioration of the sealing surfaces leads to hydraulic fluid weeping from the joint between the main case and the 4657201161: HOUS.FRONT SECT, often accompanied by a burnt smell from overheated oil.
- Delayed or harsh shifting with metallic grinding noises: Internal bearing wear or broken 0631306816: CYLINDRICAL PIN components create audible grinding during gear changes, indicating imminent planetary gear failure.
- Loss of hydraulic pressure and overheating: A compromised 0634313603: O-RING within the valve body circuit causes pressure drops, leading to clutch pack slippage and rapid temperature spikes in the transmission sump.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.026.306 |
| Assembly Type | Complete 6-Speed Powershift Transmission |
| Series | WG 190 |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| Input Torque Capacity | 1,900 Nm (1,401 lb-ft) |
| OEM Reference | ZF 4657.026.306 |
| Fastener Torque (Housing Bolts) | 120 Nm (88.5 lb-ft) for 0636100801: CAP SCREW |
Compatibility
This complete unit is engineered for the ZF WG 190 series, but its core architecture shares mounting patterns with adjacent models. It is directly compatible with WG 180 and WG 200 transmissions when used with the appropriate 0636115293: 螺栓 for bell housing attachment. The assembly also fits select WG 170 variants that utilize the same 6-speed planetary layout. For precise fitment, always cross-reference the housing bore dimensions with the 0631306816: CYLINDRICAL PIN alignment specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657201161 | HOUS.FRONT SECT | Front housing section for input shaft support |
| 0636115293 | 螺栓 | Mounting bolt for housing assembly |
| 0634313603 | O-RING | Hydraulic seal for valve body circuit |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for gearset positioning |
| 0636100801 | CAP SCREW | Fastener for clutch pack retention |
| 4656301148 | FIXING PLATE | Retaining plate for planetary carrier |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil sump |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for hydraulic circuit |
| 0636100803 | CAP SCREW | Bolt for oil pan attachment |
| 4656301047 | OIL FEED.HOUSG. | Oil distribution housing for clutch lubrication |
