When the swashplate is at neutral (zero tilt angle) there
is no stroking of the internal axial pistons and, therefore,
no flow from the pump to the motor. See Figure 6.
10 U-Type Hydrostatic Unit Service
System Description
10 - 6
Figure 6. Neutral
The direction of motor (output) shaft rotation depends
upon which port the fluid enters. Reversing the direction
that the swashplate is tilted from neutral (zero angle)
reverses the output shaft rotation, hence the direction of
the tractor. See Figure 7.
Figure 7. Reverse
Figure 8. Circuit Flow Diagram
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