Overview
The ZF 4661.172.001 CLUTCH is a critical torque-transfer component engineered specifically for the WG 90 and WG 94 series transmissions. This OEM genuine part sits within the planetary gear set assembly, where it engages and disengages power flow between the input shaft and the output shaft. As a friction-based coupling element, the 4661.172.001 clutch ensures smooth gear shifts and reliable power delivery under heavy industrial loads. The SKU 4661.172.001 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in both on-highway and off-highway applications.
Symptoms of Failure
When the ZF 4661.172.001 clutch begins to wear, operators typically notice gear slipping under load during acceleration or when climbing grades. A second common symptom is delayed or harsh engagement when shifting from neutral into drive or reverse. You may also observe abnormal transmission oil contamination with metallic particles, indicating friction material degradation. Finally, intermittent loss of power to the wheels, especially in higher gears, often points to a failing clutch pack within the WG 90 or WG 94 assembly.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4661.172.001 |
| Type | Multi-disc wet clutch |
| Outer Diameter | 172 mm (estimated) |
| Inner Diameter | 110 mm (estimated) |
| Thickness (assembled) | 38 mm (estimated) |
| Material | Sintered bronze friction plates / steel separator plates |
| Weight | 1.85 kg (estimated) |
| OEM Reference | ZF 4661.172.001 |
| Operating Pressure | 12–18 bar (estimated) |
Compatibility
This clutch is primarily designed for the ZF WG 90 and ZF WG 94 transmission series. It is also compatible with the WG 180, WG 200, and WG 250 models that share the same clutch pack architecture. Always verify your transmission’s serial number before ordering, as minor variations exist between early and late production units.
During installation, the 4661.172.001 clutch interfaces directly with the 4661101001: TRANSMISSION HOUSING, which provides the structural enclosure for the clutch pack. The 4661301007: HOUSING serves as the intermediate support for the clutch piston assembly. Hydraulic fluid is routed through the 4661301093: TUBE to actuate the clutch. Precise alignment is maintained by the 0631306174: CYLINDRICAL PIN, which indexes the clutch hub to the shaft.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101001 | TRANSMISSION HOUSING | Main structural casing for the transmission assembly |
| 4661301007 | HOUSING | Intermediate support for clutch piston and seals |
| 4661301093 | TUBE | Hydraulic fluid passage to clutch actuation circuit |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for clutch hub positioning |
| 0769123894 | TYPE PLATE | Identification plate for transmission model |
| 0750100022 | SCREW PLUG | Sealing plug for hydraulic test ports |
| 0636302602 | SCREW PLUG | Drain or fill port plug |
| 0634100633 | O-RING | Hydraulic seal between clutch piston and housing |
| 4661301029 | NOZZLE | Oil spray nozzle for clutch cooling |
| 4661301027 | NOZZLE | Secondary oil spray nozzle for lubrication |
