E750 Excavator Gearbox OEM Travel Reduction Gearbox Hydraulic Excavator Spare Parts

An excavator’s travel reducer, commonly termed the travel gearbox, acts as a key transmission component connecting the hydraulic motor and track drive wheel. It reduces rotating speed and increases torque, supplying low speed high torque power to drive the tracks.Core Structure (Three Stage Planetary Gear Assembly)• Sun Gear: Connected to the hydraulic motor’s input end and works as the power source.• Planet Gears: 3–4 gears that orbit the sun gear and rotate on their own axes to transmit power.• Ring Gear (Internal Gear Ring): Fixed or floating type meshing with planet gears.• Planet Carrier: Conveys output power to drive the reducer shell and track drive wheel.• Shell & Bearings: High strength shell provides dust proofing and leak proofing; heavy duty bearings support rotational motion.• Brake: Built in multi disc parking brake, hydraulically released under spring pressure, preventing rolling on slopes.Working PrincipleHydraulic motor outputs high speed low torque power → feeds into travel reducer → three stage planetary gears conduct stepwise speed reduction → outputs low speed high torque power → drives tracks for traveling movement.Common Problems and Their Causes Abnormal or loud operational noise: Gear abrasion, bearing damage, insufficient lubricant or deteriorated oil quality. Oil leakage issues: Aging sealing components, shell cracks, excessively high oil volume. Insufficient traction / Track deviation: Worn gears/bearings, non released brake, performance imbalance between left and right reducers. Overheating failure: Overloading operation, poor lubrication, weak heat dissipation, continuous brake friction. Gear jumping or seizing failure: Damaged gear teeth, broken planet carrier, entry of foreign impurities.