The hydrostatic motors are driven by high pressure from the hydrostatic pumps.
In this system there is a case drain filter for each motor to filter the excess low pressure oil before the oil enters the hydraulic reservoir.
There are two hydrostatic motors mounted to motor carriers. The motor carriers are mounted to the transmission tub which houses the drive chains.
The hydrostatic motors do not have an internal brake.
Inside the endcap of the hydrostatic motor, there is a shuttle valve. The shuttle valve helps to keep the motor cool by mixing case drain oil with cooled low pressure oil from the charge circuit. The shuttle valve is shifted by the high pressure oil coming from the hydrostatic pumps. If the shuttle valve sticks, a delay or lack of drive may or may not be felt in the controls and/or an overheated hydrostatic motor will result.