Overview
The ZF 6 WG 310 is a high-torque planetary gearset assembly engineered specifically for the output section of the 6WG series automatic transmissions. This component, identified by the SKU 6 WG 310, functions as the primary reduction stage, converting high-speed turbine rotation into the usable wheel speed required for heavy construction machinery. It sits directly between the torque converter housing and the final drive differential, managing the immense stress of loaders, graders, and dozers. The 6 WG 310 is designed to handle continuous shock loads while maintaining precise gear engagement under extreme thermal conditions.
Symptoms of Failure
When the ZF 6 WG 310 begins to degrade, operators typically notice distinct operational anomalies. The most common long-tail search query involves “ZF 6WG310 gear whine under load”—a high-pitched metallic noise that intensifies when the machine is pushing heavy material. Another frequent failure indicator is “transmission fluid contamination with bronze particles”, which points directly to the planetary carrier bushings wearing out. Operators also report “delayed engagement when shifting from neutral to forward”, caused by excessive clearance in the sun gear splines. Finally, intermittent loss of power on inclines suggests the 6 WG 310 is slipping internally, often due to worn thrust washers.
Technical Specifications
| Gear Ratio (Planetary Set) | 3.45:1 |
| Maximum Input Torque | 1,850 Nm (1,364 lb-ft) |
| Outer Diameter | 310 mm (12.2 in) |
| Overall Length | 195 mm (7.68 in) |
| Dry Weight | 38.5 kg (84.9 lbs) |
| Primary Material | Case-hardened 20MnCr5 steel |
| Bearing Type | Needle roller with cage |
| OEM Reference | 0501 310 002 |
Compatibility
This planetary gearset is a direct replacement for the following ZF transmission models. Always verify the serial number prefix before ordering.
- ZF WG180 (all sub-variants including WG180-2 and WG180-3)
- ZF WG200 (early and late production runs)
- ZF WG210 (used in compact wheel loaders)
- ZF 6WG310 (original equipment for this specific assembly)
- ZF 6WG200 (retrofit applications with adapter ring)
Cross-reference this part with any transmission housing stamped “6WG” followed by a three-digit torque rating. The 6 WG 310 is not compatible with the older 4WG series or the newer 8WG electronic shift units without significant modifications to the sun gear shaft.
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