ZF 4657.024.112 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4657.024.112 4 WG 190 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As the core power transfer module for the WG 190 series, it replaces the need to source individual gears and shafts. The SKU 4657.024.112 is a direct OEM-grade replacement that ensures precise shift timing and torque handling. This unit sits between the engine bellhousing and the output driveline, managing all forward and reverse speed ranges. It is commonly paired with the 4657101079: TRANSMISSION HOUSING to form the complete drivetrain assembly.

Symptoms of Failure

• Erratic or delayed gear engagement: When the internal clutch packs or hydraulic seals wear, operators experience a noticeable lag when shifting from neutral to drive or between ranges. This is often accompanied by a harsh “clunk” as the gears finally engage.
• Internal oil leaks and low pressure: Worn seals within the assembly cause transmission fluid to bypass internal passages. This results in low hydraulic pressure, which can be detected via a pressure gauge or by visible oil weeping from the bellhousing area.
• Torque converter shudder under load: A failing power shift unit will cause a vibration or shudder when the machine is under heavy load, such as during grading or dozing. This indicates that the lock-up clutch or planetary gear set is slipping.
• Metal debris in the oil pan: As internal components like bearings or friction discs degrade, metallic particles contaminate the transmission fluid. This is a definitive sign that the complete assembly requires replacement.

Technical Specifications

Compatibility

This complete assembly is engineered specifically for the ZF WG 190 series of powershift transmissions. It is a direct fit for the WG 190 model and is also compatible with the WG 180 and WG 200 series when used with the correct adapter housings. The unit integrates with the 4657201166: HOUS.FRONT SECT and the 4657201169: HOUSING REAR PART to complete the structural enclosure. For applications requiring a split rear housing, the 4657298104: HOUSING REAR SECTION is also required. This assembly is commonly found in ZF 4WG-190, 4WG-180, and 4WG-200 transmissions used in wheel loaders, graders, and material handlers.

Related Components

Frequently Asked Questions

Q: Is the 4657.024.112 a direct bolt-in replacement for a 4WG-190 transmission?
A: Yes, this complete assembly is a factory-spec replacement for the ZF 4WG-190 powershift unit. It includes all internal components and requires only the external housings and fasteners to be installed.

Q: What is the typical service life of this assembly before overhaul is needed?
A: Under normal operating conditions with proper fluid maintenance, the 4657.024.112 assembly typically lasts 8,000 to 12,000 hours. Heavy loading or contaminated fluid can reduce this lifespan significantly.

Q: Can I use this assembly with a different ZF transmission model?
A: While it is designed for the WG 190 series, it can be adapted to WG 180 and WG 200 models by using the correct front and rear housing sections, such as the 4657201166 and 4657201169 parts.