Overview
The ZF 6 WG 310 is a high-torque clutch drum assembly engineered specifically for heavy-duty powershift transmissions used in construction machinery. This critical rotating component houses the clutch pack and piston, directing hydraulic pressure to engage specific gear sets within the transmission. The SKU 6 WG 310 identifies a precision-machined steel drum that interfaces directly with the planetary gear carrier, ensuring smooth power delivery under extreme load conditions. When functioning correctly, this part maintains consistent hydraulic sealing and rotational balance, which are essential for the transmission’s shift quality and durability in excavators, wheel loaders, and graders.
Symptoms of Failure
When the ZF 6 WG 310 clutch drum begins to wear, operators typically notice these specific failure indicators:
- Erratic gear engagement or delayed shifting – Worn sealing surfaces inside the drum cause hydraulic pressure loss, leading to hesitation when selecting forward or reverse gears.
- Metallic grinding noise during acceleration – Scoring on the drum’s spline teeth or bearing journals creates audible friction, often mistaken for planetary gear failure.
- Dark, burnt transmission fluid with metallic particles – Internal cracks or spalling on the drum’s clutch hub release debris into the oil, accelerating wear on adjacent components.
- Intermittent loss of drive in specific gears – A distorted drum bore prevents the clutch piston from fully engaging, resulting in partial torque transfer under load.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 6 WG 310 |
| Outer Diameter | 310 mm (12.2 in) |
| Overall Length | 145 mm (5.7 in) |
| Material | Forged 4140 alloy steel, induction-hardened |
| Weight | 8.4 kg (18.5 lbs) |
| Spline Count (Input) | 36-tooth, involute profile |
| Seal Groove Diameter | 280 mm (11.0 in) |
| OEM Reference | ZF 0501.310.001 |
| Max Operating Pressure | 18 bar (261 psi) |
Compatibility
This clutch drum is engineered for ZF’s modular powershift transmission family. It is a direct replacement component for the following models:
- ZF WG 180 – Used in mid-size wheel loaders and telescopic handlers.
- ZF WG 200 – Common in 20-ton excavators and road rollers.
- ZF 6 WG 310 – Original equipment for heavy graders and mining dump trucks.
- ZF WG 250 – Found in large agricultural tractors and forestry skidders.
Always verify the drum’s spline count and seal groove dimensions against your transmission’s service manual before installation. For cross-referencing, consult your ZF parts catalog.
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