Overview
The ZF 4644.153.220 CLUTCH is a critical torque-transfer component engineered specifically for the WG 180 and WG 200 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. Designed to withstand high cyclic loads and thermal stress, the 4644.153.220 clutch ensures smooth gear shifts and reliable power delivery in heavy-duty industrial applications. When replacing this unit, it is essential to inspect the adjacent 4644105417 DISCONNECTION mechanism, as both components work in tandem to prevent driveline damage.
Symptoms of Failure
- Intermittent gear slipping under load: A worn 4644.153.220 clutch often causes the transmission to momentarily lose power during acceleration or hill climbing, particularly in WG 200 series units.
- Delayed or harsh engagement: When the clutch disc material degrades, operators may notice a noticeable lag between shifting and actual gear engagement, accompanied by a metallic grinding noise.
- Transmission fluid overheating: Slipping clutches generate excessive friction, leading to elevated oil temperatures and potential damage to the 4644101121 TRANSMISSION HOUSING if left unaddressed.
- Oil leaks near the bell housing: Seal failure around the clutch piston can cause hydraulic fluid to escape, reducing system pressure and compromising shift quality.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4644.153.220 |
| OEM Reference | ZF 4644.153.220 |
| Material | Sintered steel friction discs with carbon-reinforced lining |
| Outer Diameter | 220 mm |
| Inner Diameter | 153 mm |
| Total Thickness | 28.5 mm (new) |
| Weight | 2.4 kg |
| Max Torque Capacity | 1,200 Nm |
| Operating Temperature Range | -20°C to +120°C |
| Compatible Output Flange | 4644303547 OUTPUT FLANGE or 4644303012 OUTPUT FLANGE |
Compatibility
This clutch is designed for ZF WG 180 and WG 200 series transmissions, commonly found in construction equipment, agricultural machinery, and material handling vehicles. It is directly interchangeable with earlier WG 170 variants after verifying the spline count. Always confirm the housing version by checking the 4644101121 TRANSMISSION HOUSING casting number. For WG 200 models with a reinforced output section, pairing this clutch with the 4644303547 OUTPUT FLANGE ensures optimal alignment. The 4644303012 OUTPUT FLANGE is an alternative for earlier production runs.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105417 | DISCONNECTION | Disengages clutch from input shaft during maintenance |
| 4644303547 | OUTPUT FLANGE | Connects clutch output to driveshaft (reinforced version) |
| 4644303012 | OUTPUT FLANGE | Standard output flange for WG 180 series |
| 4644101121 | TRANSMISSION HOUSING | Main housing casting for clutch assembly |
| 4644301240 | TRANSMISSION HOUSING | Alternate housing for WG 200 models |
| 0730365067 | TYPE PLATE | Identification plate for transmission serial number |
| 0631311009 | GROOVED STUD | Secures clutch pack to hub |
| 4644301286 | COVER PLATE | Protects clutch piston from debris |
| 4644301242 | COVER SHEET | Thin shim for clutch pack preload adjustment |
| 0636101026 | CAP SCREW | Fastener for output flange retention |
