Overview
The ZF 4644.311.077 CLUTCH PART is a critical internal component engineered specifically for the WG 181 Series transmission. This genuine OEM part functions as a precision-machined engagement element within the clutch pack assembly, directly controlling torque transfer between planetary gear sets. Positioned within the main transmission housing, it interfaces with the hydraulic actuation system to ensure smooth gear shifts under heavy-duty industrial loads. The SKU 4644.311.077 is manufactured to ZF’s exacting tolerances, guaranteeing reliable performance in demanding applications such as construction vehicles, municipal trucks, and material handlers.
Symptoms of Failure
- Delayed or harsh gear engagement: When the 4644.311.077 clutch part wears, operators often experience a noticeable lag between shifting and actual gear engagement, or a jarring “clunk” during acceleration.
- Transmission fluid contamination: Friction material from a degraded clutch part can shed debris into the oil, leading to dark, metallic-smelling transmission fluid and potential clogging of the filter system.
- Intermittent gear slipping under load: A worn clutch component may fail to maintain clamping force, causing the transmission to momentarily lose power delivery when climbing grades or hauling heavy payloads.
- Unusual whining or grinding noises: As the clutch part loses its friction surface integrity, audible metallic sounds may emanate from the bell housing area, particularly during low-speed maneuvers.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.311.077 |
| OEM Reference | ZF WG 181 Series |
| Material | High-carbon steel with sintered bronze friction lining |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Thickness | 4.5 mm (estimated) |
| Weight | 0.85 kg (estimated) |
| Surface Finish | Ground and phosphate-coated |
Compatibility
This genuine ZF 4644.311.077 clutch part is primarily designed for the WG 181 transmission series. Based on its clutch plate geometry and spline configuration, it is also compatible with the WG 180, WG 200, and select WG 210 variants used in off-highway equipment. Always verify the clutch pack stack height and spline count against your specific transmission model before installation. For complete assembly, this part works in conjunction with the 4644101047 TRANSMISSION HOUSING and the 4644301380 HOUSING to maintain proper alignment. The 4644301189 THREADED BUSH and 0730365067 TYPE PLATE are also commonly replaced during a full clutch overhaul.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101047 | TRANSMISSION HOUSING | Encloses and supports the clutch assembly |
| 4644301380 | HOUSING | Secondary casing for clutch pack retention |
| 4644301189 | THREADED BUSH | Provides wear-resistant mounting point for clutch pistons |
| 0730365067 | TYPE PLATE | Identification tag for transmission model verification |
| 0631311009 | GROOVED STUD | Secures clutch pack alignment during assembly |
| 4644301161 | COVER PLATE | Protects clutch pack from external debris |
| 0636100621 | HEXAGON SCREW | Fastens housing components with precise torque |
| 0631610020 | SET SCREW | Locks threaded bush in position |
| 0634801098 | SEALING RING | Prevents fluid leakage at clutch piston interface |
| 4644301117 | FIXING PLATE | Anchors clutch pack to transmission housing |
