Maeda MK0003, Service Manual, Page: 93 / 348

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7.4.2 HYDRAULIC MOTOR
[1] Function of the motor
This motor is of an axial piston motor (rotary cylinder type swash plate system) and has the function to convert the
hydraulic energy supplied from the pump to a rotary motion.
[2] Structure and operating principles of the motor (see the figure below)
The hydraulic oil that has flown in through a hydraulic valve is supplied to valve plate (5). When port A is fed with
hydraulic oil, the oil flows in the cylinder port in the cylinder barrel (4) corresponding to the port A, and thrusts piston
(6). This thrusting force is converted to a rotary force by means of swash plate (7), and yielded from the shaft (3) that
is spline-coupled with cylinder barrel (4). The return oil in the cylinder port flows out through port B of valve plate (5).
In the case of a reverse run, the hydraulic oil flows in from port B, and the return oil flows out through port A.
Shaft (3)
Swash plate (7)
Port B
Port A
Valve plate
Piston (6)
Cylinder barrel (4)
Motor shaft in an integral or spline-coupling with gear S2