Overview
The ZF 4168.034.120 CONVERTER Torque Converter Assembly is a critical hydraulic component responsible for transferring engine torque to the transmission input shaft while providing torque multiplication during launch and lock-up for highway efficiency. This complete unit sits between the engine flywheel and the 4656101028: TRANSMISSION HOUSING, acting as the primary fluid coupling in the driveline. The SKU 4168.034.120 is a direct replacement assembly engineered to restore factory-specified stall speed and lock-up clutch performance in heavy-duty ZF transmissions.
Symptoms of Failure
- Torque converter shudder or vibration during lock-up: A worn 4168.034.120 unit often produces a noticeable shudder when the clutch engages, especially under load at highway speeds.
- Delayed or harsh shifting between gears: As the converter loses internal sealing, you may experience erratic shift timing or a hard “clunk” when the transmission changes ratios.
- Overheating transmission fluid with burnt smell: A failing torque converter generates excessive heat due to internal slippage, leading to fluid breakdown and a distinct burnt odor.
- Low stall speed or engine flare under acceleration: If the converter cannot hold proper hydraulic pressure, the engine RPM will rise disproportionately to vehicle speed during takeoff.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4168.034.120 |
| Assembly Type | Complete Torque Converter Unit |
| Outer Diameter | ~340 mm (estimated) |
| Overall Length | ~180 mm (estimated) |
| Weight | ~22 kg (48.5 lbs) |
| Primary Material | High-strength steel housing with hardened stator |
| OEM Reference | ZF 4168.034.120 |
| Lock-up Clutch | Integrated wet friction clutch |
Compatibility
This torque converter assembly is designed for use in the ZF WG 171, WG 190, WG 191, and WG 210 series transmissions. It is also compatible with the WG 180 and WG 200 series models that share the same bell housing bolt pattern and input shaft spline count. The 4168.034.120 unit interfaces directly with the 4656301066: HOUS.FRONT SECT and requires proper alignment with the 4656201015: SCREEN SHEET for debris protection. Additionally, the 4656301037: TUBE must be inspected during installation to ensure proper fluid flow to the converter.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train and converter assembly |
| 4656301066 | HOUS.FRONT SECT | Front section housing that supports the converter and input shaft |
| 4656201015 | SCREEN SHEET | Fine mesh filter that prevents debris from entering the converter circuit |
| 4656301037 | TUBE | Fluid transfer tube supplying oil to the torque converter lock-up circuit |
| 0634313514 | O-RING | Sealing ring for converter-to-housing interface |
| 0636100803 | CAP SCREW | Fastener for securing converter cover plate |
| 4656301042 | HOUSING REAR PART | Rear housing section that supports output shaft and bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing assembly |
| 0636100801 | CAP SCREW | Bolt for front housing section attachment |
| 0636100160 | CAP SCREW | Fastener for converter drain plug access cover |
Frequently Asked Questions
Q: Can the ZF 4168.034.120 torque converter be rebuilt, or must it be replaced as a complete unit?
A: While some internal components like the lock-up clutch can be serviced, the 4168.034.120 is designed as a sealed, balanced assembly. Replacement with a complete unit is strongly recommended to avoid imbalance issues and to ensure proper stall speed characteristics.
Q: What is the typical service life of this torque converter in a WG 190 series transmission?
A: Under normal operating conditions with proper fluid maintenance, the 4168.034.120 can last 150,000 to 200,000 miles. Contaminated fluid or excessive heat from towing can significantly reduce this lifespan.
Q: Do I need to replace the O-ring and cap screws when installing a new converter?
A: Yes. It is critical to install a new 0634313514: O-RING and fresh 0636100803: CAP SCREW fasteners to prevent fluid leaks and ensure proper torque retention.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
