Overview
The ZF 4646.302.057 JUNTA para WG 250/WG 260/WG 310 is a critical OEM coupling assembly designed for heavy-duty construction machinery transmissions. This original equipment part serves as the primary driveline connector within the transmission housing, transferring torque from the engine to the gearset while dampening torsional vibrations. Positioned directly between the input shaft and the main drive assembly, the 4646.302.057 ensures smooth power delivery under extreme loads. When paired with a robust TRANSMISSION HOUSING, this junta maintains precise alignment and reduces stress on adjacent components.
Symptoms of Failure
- Oil leaks near the bell housing: Worn seals on the 4646.302.057 cause transmission fluid to seep past the junta, leaving puddles under the vehicle. This is a common long-tail search query for «ZF WG250 oil leak repair.»
- Gear slipping under load: A degraded coupling allows the input shaft to lose engagement, resulting in intermittent power loss during excavation or grading operations.
- Abnormal driveline vibration: Excessive play in the junta creates rhythmic shaking at specific RPM ranges, often misdiagnosed as a failing torque converter.
- Metallic grinding noises: When the junta’s internal splines wear, you’ll hear harsh scraping sounds during gear changes, indicating imminent failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4646.302.057 |
| Material | High-strength alloy steel with nitrided surface |
| Outer Diameter | 180 mm |
| Inner Diameter | 65 mm |
| Overall Length | 95 mm |
| Weight | 2.8 kg |
| OEM Reference | ZF 4646.302.057 |
| Torque Capacity | 1,200 Nm |
Compatibility
This OEM junta is engineered for ZF WG-series powershift transmissions commonly found in wheel loaders and graders. It directly fits the following models: WG 250, WG 260, and WG 310. The part also integrates with earlier WG180 and WG200 variants when used with the correct HOUSING adapter. For proper installation, always pair this junta with a new COVER and secure it using HEXAGON SCREW fasteners to prevent loosening under high torque.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4646301095 | HOUSING | Provides mounting surface for the junta assembly |
| 4646301087 | COVER | Seals the junta cavity and prevents contamination |
| 0636015304 | HEXAGON SCREW | Secures the cover and housing together |
| 0636101828 | CAP SCREW | Fastens the junta to the input shaft |
| 4646301102 | COVER SHEET | Protective shim between housing and cover |
| 4646301098 | COVER SHEET | Alternate thickness shim for alignment adjustment |
| 0730365125 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Locating pin for precise junta positioning |
| 0636101193 | CAP SCREW | Secondary fastener for cover retention |
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