ZF 4168.034.121 CONVERTER Torque Converter Assembly | Complete Unit

Overview

The ZF 4168.034.121 CONVERTER Torque Converter Assembly is a complete, drop-in replacement unit engineered to transfer and multiply engine torque within the transmission’s hydraulic circuit. Positioned between the engine flywheel and the gearbox input shaft, this assembly uses a lock-up clutch and stator to optimize power delivery and reduce fuel consumption in heavy-duty industrial applications. The SKU 4168.034.121 is a fully assembled converter, eliminating the need for disassembly or core exchange. When replacing this unit, it is critical to inspect the 4656101028: TRANSMISSION HOUSING for cracks or wear, as housing integrity directly affects converter alignment and oil flow.

Symptoms of Failure

• Torque converter shudder or vibration during acceleration: Worn internal clutches or damaged stator vanes cause noticeable shaking, especially at low speeds or under heavy load.
• Delayed or harsh gear engagement: A failing converter cannot build sufficient hydraulic pressure, leading to a lag when shifting from neutral to drive or reverse.
• Overheating transmission fluid with a burnt smell: Slipping internal components generate excessive heat, degrading the oil and causing a distinct burnt odor.
• Oil leaks near the bell housing area: Failed seals or a cracked converter hub allow transmission fluid to escape, often visible as drips or puddles under the vehicle.

Technical Specifications

Compatibility

This torque converter assembly is designed for ZF WG-series powershift transmissions commonly used in construction, mining, and material handling equipment. It is a direct fit for the WG 171 Series, WG 210 Series, WG 211 Series, and WG 230 Series. These models share a common bell housing pattern and input shaft spline count. During installation, ensure the 4656301066: HOUS.FRONT SECT is clean and free of debris to guarantee proper converter seating. Additionally, the 4656201015: SCREEN SHEET should be replaced to prevent contaminants from entering the new converter, and the 4656301037: TUBE must be inspected for blockages that could restrict oil supply.

Related Components

Frequently Asked Questions

Q: Can the 4168.034.121 converter be rebuilt, or must it be replaced as a complete unit?
A: This part is sold as a complete, pre-assembled unit and is not designed for field rebuild. Replacing it as a whole ensures proper balance, stator alignment, and clutch clearance. Always replace the 0634313514: O-RING and 0636100803: CAP SCREW during installation.

Q: What causes a torque converter to fail prematurely in WG 210 series transmissions?
A: Common causes include contaminated transmission fluid (often from a failed 4656201015: SCREEN SHEET), excessive heat from a blocked 4656301037: TUBE, or misalignment due to a damaged 4656301066: HOUS.FRONT SECT.

Q: How do I verify that the 4168.034.121 is the correct converter for my ZF transmission?
A: Check the transmission model plate on the 4656101028: TRANSMISSION HOUSING. This converter fits WG 171, 210, 211, and 230 series. Measure the bell housing bolt pattern and input shaft spline count to confirm compatibility.