Overview
The ZF 4166.034.079 CONVERTER Torque Converter Assembly is a critical hydraulic component that transfers engine torque to the transmission input shaft through fluid coupling. Positioned between the engine flywheel and the transmission pump, this complete unit modulates power delivery while multiplying torque during low-speed operation. The SKU 4166.034.079 is engineered specifically for ZF’s medium-duty powershift transmissions, providing smooth engagement and reducing driveline shock in industrial applications. This assembly works in concert with the 4657101045: TRANSMISSION HOUSING to ensure proper alignment and fluid containment within the drivetrain system.
Symptoms of Failure
- Torque converter shudder or vibration during acceleration – Worn internal clutches or damaged stator bearings cause noticeable shaking when the converter locks up, often misdiagnosed as engine misfire.
- Delayed engagement or transmission slipping – A failing torque converter loses hydraulic pressure, resulting in a lag between shifting and actual gear engagement, especially under load.
- Overheating transmission fluid with burnt smell – Internal leakage or a seized one-way clutch forces the converter to generate excessive heat, leading to fluid degradation and potential seal failure.
- Torque converter drain-back noise (whining or rattling) – Worn thrust washers or damaged pump drive splines produce metallic sounds at idle, indicating imminent converter failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4166.034.079 |
| Overall Diameter | 340 mm (13.4 in) |
| Overall Length | 185 mm (7.3 in) |
| Weight | 22.5 kg (49.6 lbs) |
| Housing Material | High-strength aluminum alloy |
| Impeller Material | Heat-treated steel stamping |
| OEM Reference | ZF 4166.034.079 (OEM direct) |
| Fluid Capacity | 2.8 liters (0.74 gal) |
| Max Input Torque | 1,200 Nm (885 lb-ft) |
Compatibility
This torque converter assembly is designed for ZF powershift transmissions in the BP 210, BP 230, WG 190, WG 210, and WG 211 series. It is a direct fit for models including WG180, WG200, WG210, WG211, BP210, and BP230. The converter mates with the 4657201027: HOUS.FRONT SECT and the 4657201020: HOUSING REAR PART to form the complete converter housing assembly. Proper installation also requires the 0631306792: CYLINDRICAL PIN for precise alignment during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101045 | TRANSMISSION HOUSING | Encloses and supports all transmission internal components |
| 4657201027 | HOUS.FRONT SECT | Front section of the converter housing, mounts to engine bellhousing |
| 4657201020 | HOUSING REAR PART | Rear section of the converter housing, supports pump and stator shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-converter positioning |
| 0636100801 | CAP SCREW | Fastener for securing converter housing sections |
| 4656301148 | FIXING PLATE | Retains converter-to-flywheel bolts in position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for converter circuit oil supply |
| 4657301033 | SCREEN SHEET | Secondary mesh filter for converter return line |
| 0636100803 | CAP SCREW | High-strength bolt for converter-to-flexplate attachment |
| 0750301003 | OIL FEED.HOUSG. | Oil feed housing directing pressurized fluid to converter |
Frequently Asked Questions
Q: How do I know if my ZF 4166.034.079 torque converter is failing?
A: Common indicators include a persistent shudder during acceleration, delayed engagement when shifting from neutral to drive, and transmission fluid that appears dark or smells burnt. If you notice any of these symptoms, inspect the converter assembly and replace it with the 4166.034.079 complete unit.
Q: Can I install this torque converter without replacing the transmission housing?
A: Yes, the 4166.034.079 converter is a standalone replacement unit. However, it is strongly recommended to inspect the 4657101045: TRANSMISSION HOUSING for wear or cracks, and replace the 0631306792: CYLINDRICAL PIN if it shows any deformation.
Q: What is the torque capacity of the ZF 4166.034.079 converter?
A: This unit is rated for a maximum input torque of 1,200 Nm (885 lb-ft), making it suitable for medium-duty industrial vehicles and off-highway equipment using WG and BP series transmissions.
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