ZF 4657.024.149 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

This ZF 4657.024.149 4 WG 190 Powershift Transmission Assembly is a complete, ready-to-install unit engineered for heavy-duty industrial applications. As a core component of the WG 190 series, this assembly integrates the main gear train, clutch packs, and hydraulic control system into a single, robust package. The SKU 4657.024.149 is the definitive replacement for machines requiring a full transmission swap, ensuring seamless power delivery and shift performance. It sits at the heart of the drivetrain, converting engine torque into usable motion for loaders, graders, and material handlers. For a complete rebuild, this unit is often paired with a new TRANSMISSION HOUSING to guarantee structural integrity.

Symptoms of Failure

When the ZF 4657.024.149 assembly begins to fail, operators will notice distinct performance degradation. Common failure symptoms include:

• Erratic or delayed gear engagement: The transmission hesitates or slams into gear, often caused by worn clutch discs or valve body issues within the assembly.
• Torque converter shudder: A vibration felt during acceleration under load, indicating internal wear or contamination in the hydraulic circuit.
• External oil leaks at housing seams: Fluid weeping from the joints between the front and rear sections, often requiring replacement of the HOUS.FRONT SECT or HOUSING REAR PART.
• Loss of power in higher gears: The transmission slips under heavy load, often a sign of failing seals or a damaged HOUSING REAR SECTION.

Technical Specifications

Compatibility

This complete unit is specifically designed for the ZF WG 190 series of powershift transmissions. While the 4657.024.149 is a direct fit for the 4 WG 190 model, it is also compatible with select variants in the WG 180 and WG 200 series when used with the correct adapter kits. It is commonly found in heavy equipment such as Volvo L120 loaders, Case 921E wheel loaders, and various graders. Always verify your transmission model suffix before ordering. For a full housing rebuild, inspect the TRANSMISSION HOUSING and HOUS.FRONT SECT for cracks.

Related Components

Frequently Asked Questions

Q: Is the ZF 4657.024.149 a direct bolt-in replacement for the 4 WG 190?
A: Yes, this complete unit is a factory-spec replacement for the 4 WG 190 transmission. It includes all internal components and requires no additional parts for installation, though we recommend inspecting the TRANSMISSION HOUSING for wear.

Q: What causes the torque converter shudder symptom described above?
A: Torque converter shudder is typically caused by contaminated transmission fluid or worn lock-up clutch friction material. Replacing the complete assembly resolves this, but ensure the SCREEN SHEET filters are also changed to prevent debris circulation.

Q: Can I use this unit in a WG 180 series machine?
A: The 4657.024.149 is designed for the WG 190 series. While it may physically fit WG 180 models, the gear ratios differ. You must verify your machine’s OEM specifications before ordering.