Shibaura ST318, Workshop Manual

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(2) Fixed type motor
T514
1. Shaft (output)
2. Swash plate (fixed)
3. Cylinder block
4. Piston
5. Valve plate
T515
Above figure shows the rotary parts of the axial piston motor. Nine pistons are incorporated in the cylinder block. The
valve plate having 2 crescent-shaped passages Ps and Pd is in contact with one end of the cylinder block. The 2
crescent-shaped passages are connected with the feeding-in tube and discharging tube respectively.
When high pressure oil from the variable pump is fed to the port Ps, the piston is pushed and force acts to push the
swash plate. A component of this force in the rotating direction rotates the cylinder block, generates torque in the arrow
mark direction in the shaft through the spline of the cylinder block, and actuates the motor. Hydraulic oil is discharged
from the port Pd at this time. When high pressure oil is fed from the port Pd adversely, the above procedure is reversed.