TM 5-3805-258-24-1S Y S T E M S O P E R A T I O NP O W E R T R A INFINAL DRIVESFINAL DRIVE COMPONENTS1. Carrier.4. Cover assembly.7. Sun gear.2. Wheel assembly.5. Spindle housing.8. Ring gear.3. Brakegroup.6. Planetary gears.9. Hub.Each final drive has the same components. A finaldrive causes the last speed reduction and torque in-crease in the power train.Ring gear (8) is fastened to hub (9). Hub (9) isconnected to spindle housing (5) by splines. Spindlehousing (5) is fastened to the axle housing. Ring gear(8), spindle housing (5) and hub (9) are heldstationary.Power from the differential turns the axle shaft.The axle shaft turns sun gear (7). Sun gear (7) turnsplanetary gears (6). Since ring gear (8) is held by hub(9), the planetary gears move around the inside ofring gear (8). The movement of the planetary gearscauses planetary carrier (1) to turn. The planetarycarrier is turned in the same direction as sun gear (7)but at a slower speed. The planetary carrier turnswheel assembly (2).The axle shaft is connected to the differential byEach final drive has its own oil reservoir. Oil is putsplines. Sun gear (7) is connected to the axle shaft byinto the final drive through a fill plug on the outsidesplines. Sun gear (7) is engaged with planetary gearscover. Oil is removed from the final drive through a(6). Planetary gears (6) are held in planetary carrierdrain plug.(1). Planetary carrier (1) is fastened to wheel assem-The components of the final drives get lubricationbly (2).from the oil inside the final drives.3-59
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