Axle Propel Motor
Components Of Axle Propel Motor.
(1) Cylinder block. (2) Pin. (3) Piston. (4) Servo piston assembly. (5) Port plate. (6) Retainer ring. (7) Spring. (8) Retainer. (9) Swashplate
(10) Output shaft.
The axle propel motor is a bi-directional, variable displacement
piston motor. The motor uses a two position servo control to
provide two travel speeds.
The hydraulic oil in the main circuit of the propel system flows
in a continuous closed loop from the propel pump. The
direction of the hydraulic oil flow in the circuit, and direction the
motor turns, is determined by the direction the pump
swashplate is tilted from the neutral position (FORWARD or
REVERSE operation). The speed of the motor, in each of two
positions, is determined by the volume of hydraulic oil supplied
by the pump.
Cylinder block (1) is splined to output shaft (10). The end of
cylinder (1) and port plate (5) are high pressure, metal-to-
metal, seal surfaces. Retaining ring (6) is in a groove in the
bore of cylinder (1). Retainer (8) is against the ends of pins
(2). The force of spring (7), between retaining ring (6) and
retainer (8), holds the cylinder tight against port plate (5) and
holds the port plate against the motor housing. Spring
pressure also holds the slipper end of pistons (3) against
swashplate (9). There are seven pistons in the motor.
Swashplate (9) is connected by a pin to servo piston assembly
(4) and does not rotate. The two-position servo piston
assembly controls swashplate angle. This motor operates
either at maximum displacement (low speed) or at minimum
displacement (high speed).