Overview
This ZF 4657.024.136 4 WG 190 Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty industrial applications. As a core component of the WG 190 Series, this assembly integrates the main gear cluster, clutch packs, and hydraulic control elements into a single ready-to-install package. The SKU 4657.024.136 serves as the central power transfer module, connecting the torque converter to the output shaft within the transmission housing. When replacing this unit, it is critical to inspect the surrounding structural components, including the TRANSMISSION HOUSING and the HOUS.FRONT SECT, to ensure proper alignment and sealing.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn clutch discs or hydraulic seal degradation inside the assembly cause hesitation when shifting from neutral to drive or reverse, often accompanied by a jarring clunk.
- Internal oil leaks and pressure loss: Cracks in the assembly housing or failed gaskets lead to transmission fluid escaping, resulting in low line pressure and erratic shifting behavior.
- Torque converter shudder under load: Damaged stator support or worn bearings within the assembly produce a vibration or shudder during acceleration, particularly at low RPM.
- Complete loss of forward or reverse gears: Advanced wear of the planetary gear sets or broken clutch packs causes one or more gear ranges to stop functioning entirely, leaving the vehicle immobile.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4657.024.136 |
| Assembly Type | Complete Powershift Unit (4 WG 190) |
| Overall Length (approx.) | 620 mm |
| Overall Width (approx.) | 410 mm |
| Overall Height (approx.) | 380 mm |
| Dry Weight (approx.) | 145 kg |
| Primary Material | Cast Iron Housing with Steel Gears |
| OEM Reference | ZF 4657.024.136 |
| Torque Capacity (est.) | 1,900 Nm |
| Number of Speeds | 4 Forward / 4 Reverse |
Compatibility
This complete assembly is engineered specifically for the ZF WG 190 series powershift transmissions. It is directly compatible with the WG 190 model and shares mounting interfaces with the WG 180 and WG 200 series when used with the correct adapter plates. The assembly also integrates with the HOUSING REAR PART and the HOUSING REAR SECTION to complete the rear gear train enclosure. Typical applications include agricultural tractors, wheel loaders, and industrial forklifts from manufacturers such as John Deere, Case, and Caterpillar.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural enclosure for the gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft and pump drive |
| 4657201168 | HOUSING REAR PART | Rear housing component for output shaft support |
| 4657298101 | HOUSING REAR SECTION | Extended rear section for additional gear sets |
| 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 | 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 clutch housing |
Frequently Asked Questions
Q: Can this assembly be rebuilt, or must it be replaced as a complete unit?
A: While individual internal components like clutch discs and seals can be replaced, the ZF 4657.024.136 is typically sold as a complete, pre-assembled unit to ensure precise factory tolerances. Rebuilding requires specialized tools and access to the FIXING PLATE and screen sheets for proper reassembly.
Q: What is the typical lifespan of this powershift assembly under normal operating conditions?
A: With proper maintenance and clean hydraulic fluid, the 4 WG 190 assembly can last 8,000 to 12,000 hours. Premature failure is often caused by contamination passing through the SCREEN SHEET filters or by loose CAP SCREW fasteners allowing housing misalignment.
Q: Does this assembly include the torque converter?
A: No, the 4657.024.136 is the transmission assembly only. The torque converter must be ordered separately. Ensure the HOUS.FRONT SECT is compatible with your specific converter model before installation.
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