John Deere 8RX series

Additional Notes

• The John Deere 8RX series front differential fluid capacity is directly tied to axle width, with values ranging from 16.5 liters on the 76-inch axle up to 54 liters on the 152-inch axle. Wider axles house larger differential assemblies, which accounts for the substantially greater fluid volume required at the top of the range.
• All 8RX 310, 340, 370, and 410 models share an identical 1500-hour front differential fluid change interval under normal use conditions, regardless of axle width or serial number range.
• Units with serial numbers 801001 through 806000 across all four variants — the 310, 340, 370, and 410 — are specified with four axle width options: 76, 80, 88, and 120 inches, with corresponding capacities of 16.5, 19.5, 27.3, and 34.1 liters respectively.
• From serial number 806001 onward, all four 8RX variants gain four additional axle width configurations: 132, 136, 144, and 152 inches. The associated capacities for these wider axles are 44.9, 48.3, 48.5, and 54 liters respectively.
• The jump from the 120-inch axle capacity of 34.1 liters to the 132-inch axle capacity of 44.9 liters represents an increase of approximately 10.8 liters, the largest single step between consecutive axle widths in the specification set.
• The 136-inch and 144-inch axle options carry nearly identical capacities of 48.3 and 48.5 liters respectively, a difference of only 0.2 liters despite an 8-inch increase in axle width between the two configurations.
• The serial number boundary at 806001 is consistent across all four 8RX variants, indicating a production change point at which the wider axle options became available uniformly across the lineup.
• The 76-inch axle capacity of 16.5 liters and the 152-inch axle capacity of 54 liters represent the minimum and maximum front differential fill volumes in the specification set, a difference of 37.5 liters driven entirely by axle size rather than by engine output or model variant.