Overview
The ZF 4644.151.425 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 drive. The SKU 4644.151.425 is precision-machined to ZF’s exacting tolerances, ensuring seamless hydraulic actuation and consistent clamping force under heavy industrial loads. When paired with the 4460115043: HOUSING, this clutch forms the core of the transmission’s shifting capability, directly influencing driveline responsiveness and operational efficiency.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn 4644.151.425 clutch often causes hesitation when shifting into forward or reverse, followed by a jarring engagement. This symptom is frequently searched as “ZF WG200 transmission slipping under load.”
- Low hydraulic pressure warnings: Internal wear on the clutch piston seals leads to pressure loss, triggering dashboard alerts. Technicians often look for “ZF 4644.151.425 oil leak from bell housing” when diagnosing this issue.
- Burning smell from transmission fluid: Slipping clutch plates generate excessive heat, oxidizing the ATF. This is a common complaint described as “burning clutch smell in ZF WG180 transmission.”
- Erratic shifting at low speeds: Worn friction material causes inconsistent lock-up, particularly during stop-and-go operations. This aligns with long-tail queries like “ZF WG200 jerky shifting when cold.”
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.151.425 |
| OEM Reference | ZF Friedrichshafen AG |
| Material | Sintered bronze friction lining on hardened steel core |
| Outer Diameter | 245 mm |
| Inner Diameter | 165 mm |
| Thickness | 4.2 mm |
| Weight | 1.85 kg |
| Operating Pressure | 12–18 bar |
| Max Torque Capacity | 2,400 Nm |
Compatibility
This clutch is engineered for the ZF WG 180 and WG 200 series transmissions, commonly found in municipal trucks, fire apparatus, and heavy-duty construction vehicles. It is a direct replacement for the clutch pack in both 6-speed and 8-speed variants of these models. The 4644.151.425 interfaces directly with the 4469315012: AXLE DRIVE HOUSING and relies on the 0750117406: TAPER ROLLER BEARING for rotational support. For proper axial alignment, the 0750117802: TAPERED ROLLER BEARING must also be inspected during clutch replacement. Always verify your transmission serial number against ZF’s OEM catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4460115043 | HOUSING | Encloses and aligns the clutch pack assembly |
| 4469315012 | AXLE DRIVE HOUSING | Transfers torque from clutch to differential |
| 0750117406 | TAPER ROLLER BEARING | Supports radial and axial loads on input shaft |
| 0750117802 | TAPERED ROLLER BEARING | Provides precise rotational stability for output shaft |
| 0734319337 | SHAFT SEAL | Prevents fluid leakage at clutch piston bore |
| 0730161317 | WASHER | Spacing and load distribution for clutch pack |
| 0730161451 | WASHER | Thrust washer for axial clearance adjustment |
| 0730161452 | WASHER | Stepped washer for clutch piston return spring |
| 0730161453 | WASHER | Flat washer for bearing preload setting |
| 0730161340 | WASHER | Locking washer for clutch hub retention |
