PRIMARY POWERTRAIN CONTINUED
Steering Differential and Brake
This section provides a short introduction to the hydraulic motor, the hydraulic pump, and the steering controls.
The machine uses a differential steering system. The basic system includes a steering differential, a hydraulic
pump, a hydraulic steering motor, and steering controls.
The steering differential receives power from two components. One power input is from the transmission for control
of the speed and for FORWARD or REVERSE movement. The other input is from the hydraulic motor for control of
The steering motor feeds hydraulic power to the steering differential. The steering differential increases the speed
of one track. The steering differential decreases the speed of the other track. The speed difference of the tracks
turns the machine.
The direction of rotation of the hydraulic motor determines the direction of the turn. A higher motor speed results in
a sharper turn of the machine.
The steering differential includes two planetary gear trains, a bevel gear set, and a set of brakes, which are
mechanically connected with the steering differential.
The planetary gears, the bevel gears, and the brakes are connected by components in the powertrain. Two outer
axle shafts, an inner axle shaft, and the bevel gear shaft of the transmission connect these components of the
Power flow through the differential steering system is in three parts:
Combined Transmission and Steering