Travel Motor Assembly Final Drive Gearbox 11Y-27-10102 11Y-27-20300 11Y-27-20400 For Komatsu D31EX-21 D31PX-21 D37EX-21 D37PX-21 D39EX-21 D39PX-21 Bulldozer Spare Parts Common Faults Insufficient output torque of travel motor, weak dozer travelling Slow travel speed on one side, machine drifting Abnormal noise of travel motor with housing vibration Oil leakage on motor housing, damaged oil seals and gaskets Internal wear of motor, excessive operating temperature Unstable