Overview
The ZF 4660.174.015 CLUTCH is a critical torque-transfer component engineered for the WG 92 and WG 98 series transmissions. This OEM genuine part sits within the planetary gearset assembly, where it engages and disengages power flow between the input shaft and the intermediate housing. Designed to withstand high cyclic loads, the 4660.174.015 clutch pack ensures smooth gear shifts and reliable power delivery under heavy-duty industrial conditions. When replacing this unit, technicians often inspect the adjacent 4660101017: TRANSMISSION HOUSING for wear, as housing distortion can accelerate clutch degradation.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn friction discs cause a noticeable lag when shifting from neutral to drive, often accompanied by a jarring thud.
- Torque converter shudder under load: As the clutch loses clamping force, operators report a low-frequency vibration during acceleration, especially on inclines.
- Burnt transmission fluid odor: Slipping clutches generate excessive heat, producing a distinct acrid smell from the oil dipstick or breather vent.
- Intermittent loss of forward or reverse drive: Internal leakage past the clutch piston leads to pressure drops, causing the transmission to momentarily lose power in specific gear ranges.
Technical Specifications
| Part Number | 4660.174.015 |
| Type | Multi-disc wet clutch pack |
| Outer Diameter | 174 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Friction Disc Count | 5 steel / 5 friction |
| Material | Sintered bronze on steel core |
| Weight | 1.8 kg (4.0 lbs) |
| OEM Reference | ZF 4660.174.015 |
| Seal Type | PTFE lip seal (integrated) |
Compatibility
This clutch is primarily designed for the ZF WG 92 and WG 98 series transmissions, which are common in municipal trucks, fire apparatus, and medium-duty construction vehicles. It also fits select variants of the WG 180 and WG 200 series when used with the correct 4660301054: HOUSING II adapter. For proper installation, always verify the spline count and stack height against your transmission’s service manual. The clutch assembly interfaces directly with the 0631306174: CYLINDRICAL PIN that aligns the piston return spring, and the 0769123894: TYPE PLATE should be checked for correct model identification before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing for gearset |
| 4660301054 | HOUSING II | Intermediate housing for clutch pack |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for piston assembly |
| 0769123894 | TYPE PLATE | Identification tag for transmission series |
| 0750100022 | SCREW PLUG | Seals oil passages in valve body |
| 4660221029 | SUCTION TUBE | Oil pickup from pan to pump |
| 0634100317 | O-RING | Seals clutch piston bore |
| 0636103273 | CAP SCREW | Fastens housing sections |
| 0634306311 | O-RING | Seals oil cooler line fitting |
| 4660321029 | FIXING PLATE | Retains clutch pack in drum |
