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Established in 1974, Doosan Mottrol advanced into the unexplored hydraulic industry by making hydraulic parts, hydraulic press and hydraulic systems in the defense industry, steering gears for ships and winches. Doosan Mottrol kept growing by diversifying its business into almost all hydraulic products. Its competencies in hydraulics, electrical systems and electronic led to it becoming Korea’s top maker of travel devices, swing motors, and main pumps.
Doosan Mottrol’s flagship travel device currently marketed under the brand name of “TM40VD” is designed for crawler machines such as excavators, drilling machines, cranes, etc. The motor is a case-rotation, high-torque motor that can be installed inside the crawler by connecting sprockets with motor cases.
The travel device has a variable displacement (two-speed) swash plate and incorporates a brake valve and a mechanical brake needed for traveling. Travel device with planetary reduction gear offers outstanding features. Hydraulically balanced piston motor ensures reliable changeover of the displacement by external pilot control. The built-in motor offers speed control and braking to minimize shock with a built-in counterbalance valve and shockless relief valve. The mechanical brake is a negative. The brake is automatically activated or released for stop or start.
The case rotation type gear reducer has improved durability and reliability because of its simple and equally loaded design in addition to high-precision machine parts. The motor uses heavy duty bearings to ensure long life. An efficient floating seal also prevents dust and water from entering the motor.
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