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| Illustration 1 | g01423692 |
Right Side of Drum (1) Vibratory motor (2) Case drain line | |
Vibratory motor (1) is mounted on the right side of the drum. The vibratory motor is a piston motor with a fixed displacement. This motor turns the eccentric weight shaft when the vibratory system is operating.
Rubber isolation mounts dampen the vibration which is transmitted from the drum to the machine when the vibratory system is operating.
Vibratory motor (1) contains an integral flushing valve. This valve operates in the same manner as the flushing valve on the propel motors except that the flushing relief valves are set to open when the low pressure side of the loop is above 1600 kPa (232 psi). Case drain line (2) directs oil to the return manifold.
Speed sensor (if equipped) is mounted to the vibratory motor. The sensor is located to the rear of the vibrator motor. The speed sensor is a frequency-type device. A gear on the output shaft of the vibratory motor rotates past the tip of the speed sensor. Each time a tooth passes the sensor, an electrical impulse is sent to contact "3" of the vibratory tachometer.
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| Illustration 2 | g01423693 |
Motor Cross Section (3) Piston (4) Slipper pad (5) Output shaft (6) Barrel assembly (5) Valve plate (8) Flushing relief valve (9) Flushing relief valve (10) Shim (11) Flushing spool (12) Flushing spool | |
The vibratory motor uses a fixed-position swashplate and an axial-piston rotating group. The motor is equipped with a loop flushing valve.
When the vibratory system is operating, supply oil from the vibratory pump enters the motor. Supply oil is directed to the inlet port of the valve plate. Supply oil is also directed to the flushing spool. The valve plate directs oil into the piston chamber in the barrel assembly. This pressure forces the pistons which are aligned with the inlet port to move out of the barrel assembly.
As the pistons are forced out of the barrel assembly, the slipper pads slide along the swashplate. This action causes the barrel assembly and pistons to rotate. Since the barrel assembly is splined to the output shaft, the output shaft also rotates.
As the barrel assembly rotates, pistons align with the outlet port in the valve plate. The rotation of the barrel assembly forces oil out of the piston chambers and into the low-pressure side of the hydrostatic loop. The low-pressure oil then returns to the inlet side of the hydraulic pump, which completes the hydrostatic circuit.
High-pressure oil acts against one side of the flushing spool, and low-pressure oil acts against the other. The force from the high-pressure oil causes the flushing spool to shift. The shift opens a passage for oil in the low-pressure circuit to act against the flushing relief valve.
The flushing relief valve opens at 1600 kPa (232 psi). This pressure is lower than the setting of the charge relief valve. Therefore, during normal operating conditions the flushing relief valve opens when the vibratory system is operating. This results in oil being flushed from the hydrostatic circuit. An orifice in the motor controls the flow rate. The oil is flushed through the motor case.
Note: The orifice in the motor only allows a small amount of oil from the low-pressure loop to flow into the motor case compared to the total amount of charge flow available. Therefore, even though the flushing relief valve opens at 1600 kPa (232 psi), because of the orifice, charge pressure only drops slightly when the vibratory system is operating.