Overview
The ZF 4657.084.103 4 WG 230 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in ready core for heavy-duty powershift applications. This complete unit integrates the main gear train, clutch packs, and hydraulic control system into a single, pre-tested assembly. As the central power transfer module, it sits between the engine and the final drive, managing torque distribution across four forward and reverse speeds. The SKU 4657.084.103 is the definitive reference for this complete assembly, ensuring you receive the exact OEM-spec unit for your rebuild or replacement project. For a full rebuild, this assembly is typically mounted within the 4657101078: TRANSMISSION HOUSING, which provides the structural foundation for the entire drivetrain.
Symptoms of Failure
- Delayed or harsh gear engagement: When the complete unit wears, you may notice a significant lag between shifting and engagement, or a jarring “clunk” as clutches grab. This often indicates internal seal or clutch pack degradation within the assembly.
- Torque converter shudder under load: A vibration or shudder during acceleration, especially in lower gears, suggests worn stator or turbine components inside the complete unit. This is a classic sign of internal hydraulic pressure loss.
- External oil leaks at housing seams: Fluid weeping from the joint between the front and rear sections of the transmission indicates gasket or seal failure. This often requires replacing the 4657201166: HOUS.FRONT SECT or the 4657201168: HOUSING REAR PART to restore sealing integrity.
- Intermittent loss of power in higher gears: If the transmission slips out of gear or fails to hold torque in 3rd or 4th, the complete unit’s clutch packs or planetary gear sets are likely failing internally.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number / SKU | 4657.084.103 |
| Assembly Type | Complete Powershift Unit (4 WG 230) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Primary Material | Cast Iron Housing / Steel Gears |
| OEM Reference | ZF 4 WG 230 |
| Related Fastener | 0636100801: CAP SCREW |
| Related Alignment Pin | 0631306816: CYLINDRICAL PIN |
Compatibility
This complete unit is specifically engineered for the ZF WG 230 Series powershift transmissions. Based on its design and part number lineage, the 4657.084.103 is directly compatible with the following ZF models: WG 180, WG 200, and WG 230. It is also used in select variants of the 4 WG 200 and 4 WG 230 series found in agricultural tractors, wheel loaders, and industrial forklifts. When installing, ensure the 4657298101: HOUSING REAR SECTION is properly aligned to avoid binding the output shaft.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural casing for the assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft and pump drive |
| 4657201168 | HOUSING REAR PART | Rear housing section supporting output shaft bearings |
| 4657298101 | HOUSING REAR SECTION | Alternate rear housing component for PTO integration |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Retaining plate for clutch pack assembly |
| 4657301032 | SCREEN SHEET | Filter screen for hydraulic oil return line |
| 4657301033 | SCREEN SHEET | Secondary filter screen for pressure line |
| 0636100803 | CAP SCREW | High-torque fastener for rear housing bolts |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
