Overview
This complete ZF 4657.024.128 4 WG 190 Powershift Transmission Assembly is a fully integrated drop-in unit designed for heavy-duty off-highway machinery. As the core power transfer module in the WG 190 series, this assembly manages torque distribution across four forward and reverse speeds under high-load conditions. The SKU 4657.024.128 replaces worn or failed assemblies, restoring precise clutch modulation and hydraulic pressure regulation. It integrates directly with the 4657101078: TRANSMISSION HOUSING and mates to the 4657201166: HOUS.FRONT SECT to form the sealed driveline envelope.
Symptoms of Failure
- Erratic gear engagement under load: When the internal clutch packs or valve body wear, operators experience delayed or harsh shifting during grading or dozing operations.
- Hydraulic oil leaks at housing seams: Cracks or gasket failure in the main casing allow transmission fluid to escape, often visible near the 4657201168: HOUSING REAR PART interface.
- Torque converter shudder: Worn stator or turbine components within the assembly cause vibration during acceleration, particularly in reverse.
- Loss of power to wheels: Internal seal degradation leads to pressure drop, preventing full clutch pack lockup and reducing tractive effort.
Technical Specifications
| Parameter | Value |
|---|---|
| Assembly Weight | 185 kg (408 lb) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4657.024.128 / 4 WG 190 |
| Max Input Torque | 1,200 Nm |
| Hydraulic Pressure Range | 18–22 bar |
Compatibility
This complete unit is engineered for the ZF WG 190 series powershift transmissions. It is directly compatible with WG 180, WG 190, and WG 200 models used in wheel loaders, telehandlers, and industrial tractors. The assembly also fits select WG 210 variants when paired with the correct 4657298101: HOUSING REAR SECTION. Always verify bellhousing bolt patterns before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section enclosing torque converter |
| 4657201168 | HOUSING REAR PART | Rear cover for output shaft support |
| 4657298101 | HOUSING REAR SECTION | Extended rear section for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M12 fastener for housing bolts |
| 4656301148 | FIXING PLATE | Locking plate for clutch piston retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for suction line |
| 0636100803 | CAP SCREW | M10 fastener for valve body mounting |
Frequently Asked Questions
Q: Can this assembly be rebuilt, or is it only sold as a complete unit?
A: The 4657.024.128 is supplied as a factory-sealed complete unit. While internal components like clutch discs and seals are serviceable, ZF recommends full assembly replacement when multiple failure symptoms are present to ensure housing integrity.
Q: What is the typical service life of this transmission assembly?
A: Under normal operating conditions with proper fluid maintenance, the WG 190 assembly often exceeds 8,000 hours. Harsh environments or repeated shock loading may reduce this to 4,000–5,000 hours.
Q: Does this unit include the torque converter?
A: Yes, the complete assembly includes the integrated torque converter, pump drive gear, and all internal valve bodies. Only external components like the TRANSMISSION HOUSING and HOUS.FRONT SECT must be transferred from the old unit.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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