Overview
The ZF 4657.036.005 6 WG 191 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in ready drivetrain component engineered for heavy-duty off-highway machinery. This complete unit integrates the main gear cluster, clutch packs, and hydraulic control system within a single robust housing. The SKU 4657.036.005 designates a factory-specification assembly that replaces the entire transmission core, eliminating the need for piecemeal rebuilding. It sits as the central power transfer module between the engine and the final drive, converting torque through six forward speeds and one reverse. For a full rebuild, this unit must be mated to a sound 4657101049: TRANSMISSION HOUSING to ensure correct alignment and oil sealing.
Symptoms of Failure
When the ZF 4657.036.005 assembly begins to fail, operators typically notice these specific warning signs:
- Erratic gear engagement or slipping under load: The transmission hesitates or loses power when shifting from forward to reverse, often accompanied by a delayed “clunk.”
- External oil leaks at the housing seam: Hydraulic fluid seeps from the joint between the front and rear sections, indicating a compromised seal or cracked casting.
- Overheating during continuous operation: The transmission temperature gauge rises rapidly due to internal clutch pack wear or blocked oil passages.
- Unusual whining or grinding noises: Metallic sounds from the gear train suggest bearing failure or gear tooth damage within the assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.036.005 |
| Assembly Type | Complete Powershift Unit (6 WG 191) |
| Overall Length | 780 mm (estimated) |
| Overall Width | 520 mm (estimated) |
| Overall Height | 610 mm (estimated) |
| Dry Weight | 295 kg (estimated) |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 6 WG 191 |
| Max Input Torque | 1,200 Nm (estimated) |
| Oil Capacity | 18 liters (estimated) |
Compatibility
This complete unit is specifically designed for the ZF WG 191 Series powershift transmissions. It is directly compatible with the following ZF models that share the same bellhousing pattern and gear ratio set: WG 180, WG 200, and WG 211. It also fits select variants of the WG 160 series when used with the correct adapter plate. The assembly integrates with the 4657301130: HOUS.FRONT SECT and the 4657301131: HOUSING REAR PART to form the complete structural shell. Secure fastening is achieved using the 0631306816: CYLINDRICAL PIN for precise dowel alignment during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4657301130 | HOUS.FRONT SECT | Front section housing the input shaft and pump drive |
| 4657301131 | HOUSING REAR PART | Rear section enclosing the output shaft and PTO |
| 0631306816 | CYLINDRICAL PIN | Dowel pin for precise housing alignment |
| 0636102489 | CAP SCREW | M12 bolt for securing housing flanges |
| 4656301148 | FIXING PLATE | Locking plate for clutch pack retention |
| 0636102463 | CAP SCREW | M10 bolt for valve body attachment |
| 4657201133 | SCREEN SHEET | Oil filter screen for hydraulic circuit |
| 0636115287 | CAP SCREW | M8 bolt for cover plate fastening |
| 4657301065 | PLATE | Spacer plate for clutch pack adjustment |
