Overview
This complete ZF 4657.024.034 4 WG 190 Powershift Transmission Assembly is the core hydraulic-mechanical unit responsible for directing torque and managing gear selection in heavy-duty industrial drivelines. As a fully assembled unit, it integrates the clutch packs, planetary gear sets, and valve body necessary for smooth, powershift operation under load. The SKU 4657.024.034 is a direct replacement for the WG 190 series, serving as the central power distribution module that connects the engine output to the final drive. Within the assembly, the TRANSMISSION HOUSING provides the structural backbone, while the HOUS.FRONT SECT and HOUSING REAR PART enclose the rotating components, ensuring precise alignment and oil containment.
Symptoms of Failure
- Delayed or harsh gear engagement: When the internal clutch packs or valve body wear, operators experience a noticeable lag or jarring shift between forward and reverse gears, often accompanied by a loss of hydraulic pressure.
- External oil seepage from housing seams: Cracks or gasket failure in the main casing lead to fluid leaks around the bell housing or mid-section, leaving puddles under the equipment and reducing lubrication efficiency.
- Intermittent power loss under load: Worn planetary gears or damaged bearings cause the transmission to slip or lose torque during heavy pulling, resulting in reduced machine productivity and elevated operating temperatures.
- Unusual whining or grinding noises: Metal-on-metal contact from failed thrust washers or a damaged CYLINDRICAL PIN creates audible distress signals, indicating imminent internal failure.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.024.034 |
| Series | WG 190 (4 WG 190) |
| Type | Powershift Transmission Assembly (Complete Unit) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-Grade Cast Iron / Aluminum Alloy |
| OEM Reference | ZF 4 WG 190 |
| Bolt Torque Spec (Main Housing) | 120 Nm (refer to service manual) |
Compatibility
This complete assembly is engineered for the ZF WG 190 series, but its core architecture shares mounting patterns and hydraulic logic with adjacent models. It is a direct fit for the WG 180 and WG 200 transmissions, provided the bell housing and output flange configurations match. The unit is also commonly retrofitted into WG 170 applications where an upgrade to higher torque capacity is required. For proper sealing and alignment, always pair this assembly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to ensure correct oil gallery routing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101031 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4657201027 | HOUS.FRONT SECT | Front section enclosing clutch packs and pump drive |
| 4657201020 | HOUSING REAR PART | Rear section supporting output shaft and bearings |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Retains internal components against axial movement |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit protection |
| 4657301033 | SCREEN SHEET | Secondary filter for return line debris capture |
| 0636100803 | CAP SCREW | High-tensile bolt for valve body attachment |
| 4681301040 | OIL FEED.HOUSG. | Distributes pressurized oil to clutch circuits |
Frequently Asked Questions
Q: Can the ZF 4657.024.034 be installed without replacing the housing sections?
A: It is strongly recommended to inspect and replace the TRANSMISSION HOUSING and both front/rear sections if they show wear, as mismatched bores can cause premature seal failure.
Q: What is the typical service life of this complete unit under normal conditions?
A: With proper maintenance and clean hydraulic oil, the assembly often exceeds 8,000 operating hours before requiring a rebuild, though filter and screen replacement (such as part 4657301032) should be performed every 1,000 hours.
Q: Does this assembly include the oil feed housing?
A: No, the OIL FEED.HOUSG. is a separate component that must be ordered alongside the unit to ensure proper lubrication of the clutch packs.
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