Overview
The ZF 4644.151.484 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 engine and driveline. The SKU 4644.151.484 is precision-machined to ZF’s exacting tolerances, ensuring consistent hydraulic pressure application and smooth gear engagement. When installed alongside the 4644105424: DISCONNECTION unit, this clutch forms the primary coupling mechanism that enables seamless shifting under heavy load conditions.
Symptoms of Failure
- Delayed or harsh gear engagement — A worn 4644.151.484 clutch often causes noticeable hesitation when shifting from neutral to drive or reverse, accompanied by a jarring thud as the clutch plates slip before locking.
- Torque converter shudder at low RPM — As the clutch friction material degrades, operators may feel a vibration or shudder during light throttle acceleration, particularly between 800-1200 RPM.
- Transmission overheating with burnt fluid odor — Internal slippage generates excessive heat, leading to dark, burnt-smelling transmission fluid and potential damage to the 4644101224: TRANSMISSION HOUSING if left unaddressed.
- Intermittent loss of power under load — When climbing grades or hauling heavy loads, the clutch may momentarily disengage, causing a sudden drop in wheel torque before re-engaging abruptly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.151.484 |
| OEM Reference | ZF 4644.151.484 |
| Material | Sintered bronze friction plates with steel separator discs |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Total Thickness (stacked) | 42 mm (estimated) |
| Weight | 2.8 kg (6.2 lbs) |
| Hydraulic Pressure Range | 12-18 bar |
| Max Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This clutch is designed for ZF WG 180 and WG 200 series transmissions, which are commonly found in heavy-duty construction equipment, municipal trucks, and agricultural machinery. The 4644.151.484 interfaces directly with the 4644303538: OUTPUT FLANGE and is secured using 0636021036: HEXAGON SCREW fasteners. It is compatible with all WG 180 and WG 200 variants produced after 2005, including models with integrated retarder systems. For proper installation, verify that your transmission housing is free of scoring or warping, as the clutch pack requires a flat mating surface to maintain hydraulic seal integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105424 | DISCONNECTION | Hydraulic valve that isolates clutch pressure during neutral |
| 4644303538 | OUTPUT FLANGE | Transfers torque from clutch pack to driveshaft |
| 0636021036 | HEXAGON SCREW | Fastener for clutch pack retention |
| 4644101224 | TRANSMISSION HOUSING | Encloses clutch assembly and supports bearings |
| 4644301346 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 series |
| 0730365067 | TYPE PLATE | Identification label for transmission model |
| 4644106300 | SHIFT SYSTEM | Electro-hydraulic shift actuator assembly |
| 4644306500 | COVER PLATE | Seals the clutch access port on housing |
| 4644159311 | SHIFT SYSTEM | Secondary shift valve for range selection |
| 4644306563 | VALVE BLOCK | Hydraulic control manifold for clutch modulation |
