Overview
The ZF 4166.028.093 CONVERTER Torque Converter Assembly is a complete, ready-to-install unit designed for the WG 100 Series transmission family. This critical component sits between the engine flywheel and the transmission input shaft, serving as the primary hydraulic coupling that multiplies engine torque during launch and smooths power delivery during gear changes. The SKU 4166.028.093 represents a factory-spec assembly, including the impeller, turbine, stator, and lock-up clutch, all housed within a precision-machined shell. When installed alongside a 4651101007: TRANSMISSION HOUSING, this converter ensures optimal fluid flow and thermal management for heavy-duty industrial applications.
Symptoms of Failure
When the ZF 4166.028.093 torque converter begins to fail, operators will notice distinct performance degradation. Common failure symptoms include:
- Shuddering or vibration during lock-up engagement — A telltale sign of worn clutch friction material inside the converter, often felt as a low-frequency shake at highway speeds.
- Delayed or harsh shifting — Reduced hydraulic pressure from internal seal wear causes the transmission to hesitate before engaging gears, particularly under load.
- Overheating transmission fluid — A failing stator or damaged impeller vanes reduce fluid circulation, leading to burnt-smelling oil and elevated temperature warnings on the dash.
- Torque converter drain-back noise — A whining or grinding sound at idle, indicating worn bearings or a cracked turbine hub, which can lead to complete loss of drive.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4166.028.093 |
| Assembly Type | Complete Torque Converter (with lock-up clutch) |
| Outer Diameter | ~340 mm (estimated) |
| Mounting Bolt Pattern | 6-bolt, 180 mm PCD (estimated) |
| Weight | ~18.5 kg (40.8 lbs) |
| Primary Material | Cast aluminum housing with steel turbine |
| OEM Reference | ZF 4166.028.093 |
| Fluid Capacity | ~1.2 liters (estimated) |
Compatibility
This converter assembly is specifically engineered for the ZF WG 100 Series transmission family, which includes models such as the WG180, WG200, and WG210. It is also compatible with select variants of the ZF Ecomat 4HP and 5HP series used in medium-duty trucks and off-highway equipment. For proper installation, ensure the 4651301029: HOUSING and 4651301024: HOUSING are inspected for wear, and always replace the 0634303928: O-RING during reassembly to prevent fluid leaks. This unit is not backward-compatible with older ZF 4HP22 or 5HP24 models without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4651301029 | HOUSING | Intermediate housing for valve body assembly |
| 0634303928 | O-RING | Seals converter-to-housing interface |
| 4651301024 | HOUSING | Rear housing for output shaft support |
| 4651203002 | SCREEN SHEET | Oil filter screen for pump intake |
| 4651303005 | SCREEN SHEET | Fine mesh filter for valve body |
| 0636101032 | CAP SCREW | Fastener for converter housing bolts |
| 0630361028 | SEALING CAP | Cover for hydraulic test ports |
| 4475280060 | SCREW PLUG | Drain plug for converter housing |
| 0634303312 | O-RING | Seal for screw plug |
