Overview
The ZF 4642.251.012 DISC CARRIER is a critical rotating component within the WG150 series transmission, responsible for housing and aligning the clutch disc packs that transfer torque from the engine to the drivetrain. As an OEM genuine part, this disc carrier ensures precise gear engagement and smooth power flow under heavy loads. The SKU 4642.251.012 is engineered to withstand high axial and radial forces, maintaining structural integrity during shifting cycles. It sits directly within the main shaft assembly, interfacing with the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING to create a sealed, oil-tight environment for the clutch system.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn disc carrier can cause misalignment of clutch packs, leading to sluggish shifting or jarring engagement under load.
- Metallic grinding noises from the transmission: When the carrier surface degrades, metal-on-metal contact occurs, producing a distinct grinding sound during acceleration or deceleration.
- Oil contamination with metallic debris: Carrier wear particles mix with transmission fluid, visible as glitter in the oil, which accelerates damage to other components like the 0631311009: GROOVED STUD and sealing surfaces.
- Intermittent loss of drive power: A failing carrier may allow clutch packs to slip, causing temporary power loss, especially when climbing grades or towing heavy loads.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4642.251.012 |
| OEM Reference | ZF WG150 Series |
| Material | High-strength alloy steel with induction-hardened splines |
| Outer Diameter | Approx. 180 mm |
| Inner Diameter | Approx. 65 mm (spline bore) |
| Weight | 2.8 kg (6.2 lbs) |
| Surface Finish | Phosphate-coated for corrosion resistance |
| Torque Capacity | Up to 1,200 Nm (estimated) |
Compatibility
This disc carrier is specifically designed for the ZF WG150 series, but its spline geometry and carrier depth also make it compatible with the WG180 and WG200 models when used with the correct clutch pack configuration. It is a direct replacement for units requiring the 0730365125: TYPE PLATE for identification. Always verify the carrier’s axial clearance against the transmission housing to ensure proper fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses the gear train and supports the disc carrier assembly |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing section for clutch and valve body integration |
| 0730365125 | TYPE PLATE | Identification tag for transmission model and serial number |
| 0631311009 | GROOVED STUD | Fastener for securing the carrier to the shaft assembly |
| 4642301168 | SCREEN SHEET | Filter mesh for oil flow regulation near the carrier |
| 4642301169 | SCREEN SHEET | Secondary oil strainer for clutch lubrication circuit |
| 0636100621 | HEXAGON SCREW | Mounting bolt for housing and carrier retention |
| 4642301186 | SCREEN SHEET | Fine-mesh filter for high-pressure oil passages |
| 4644106085 | SHIFT SYSTEM | Hydraulic actuator controlling clutch pack engagement |
| 4642306050 | COVER PLATE | Seals the carrier access port to prevent oil leakage |
