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| Illustration 1 | g01820553 |
The propel control system contains an electrical portion, a hydraulic portion, and a mechanical portion. The electrical portion is made up of an electronic control module (ECM) and associated input and output devices. The hydraulic portion consists of a closed circuit hydrostatic drive loop with a single pump and two motors, and the mechanical portion consists of a planetary gear reducer to drive each drum.
The propel hydraulic system shares a common hydraulic tank with the steering and vibratory hydraulic systems. The steering pump supplies charge oil to the propel system. The front propel motor is a single speed motor, and the rear propel motor is a two speed motor. Each gear reducer is equipped with spring applied, hydraulically released parking brake.