Overview
The ZF 4657.036.006 6 WG 191 Powershift Transmission Assembly | Complete Unit is a fully integrated, factory-matched gearbox core designed for heavy-duty off-highway machinery. This complete assembly serves as the central power distribution hub, converting engine torque into controlled, multi-speed output for loaders, graders, and industrial vehicles. The SKU 4657.036.006 represents a drop-in ready unit that includes the main casing, clutch packs, and planetary gear sets. Within the transmission architecture, this assembly interfaces directly with the 4657101049: TRANSMISSION HOUSING to provide structural integrity and oil routing channels.
Symptoms of Failure
- Erratic gear engagement and slipping under load: When the complete unit wears, internal clutch pack clearances increase, causing delayed shifts or complete loss of drive in specific ranges.
- External oil seepage at mating flanges: Fatigue cracks in the main casing or degraded seals around the 4657301130: HOUS.FRONT SECT lead to visible hydraulic fluid leaks, especially after prolonged operation.
- Metallic grinding noise during directional changes: Worn planetary bearings or damaged sun gears produce a distinct chatter, indicating imminent internal failure of the assembly.
- Overheating transmission fluid: A failing unit generates excessive friction, causing the oil temperature to spike beyond normal operating ranges, often accompanied by a burnt odor.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4657.036.006 |
| Assembly Type | Complete Powershift Unit (6 WG 191) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Primary Material | High-Grade Cast Iron / Steel Alloy |
| OEM Reference | ZF 6 WG 191 Series |
| Bolt Torque Spec (Housing) | 120 Nm (refer to 0636102489: CAP SCREW) |
Compatibility
This complete unit is engineered for the ZF WG 191 series, but its core architecture shares mounting patterns with the WG 180 and WG 200 families. It is a direct replacement for models utilizing the 6-speed powershift layout, including the 6 WG 180, 6 WG 191, and 6 WG 200 variants. The assembly requires precise alignment with the 4657301131: HOUSING REAR PART and the 0631306816: CYLINDRICAL PIN for correct dowel positioning during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657301130 | HOUS.FRONT SECT | Front section housing input shaft |
| 4657301131 | HOUSING REAR PART | Rear section supporting output flange |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636102489 | CAP SCREW | High-tensile bolt for housing fastening |
| 4656301148 | FIXING PLATE | Locks bearing preload in assembly |
| 0636102463 | CAP SCREW | Fastener for fixing plate retention |
| 4657201133 | SCREEN SHEET | Filter mesh for oil return circuit |
| 0636115287 | CAP SCREW | Bolt for screen sheet mounting |
| 4657301065 | PLATE | Spacer plate for clutch pack shimming |
