BARREL GP-PUMP 1453163 - Caterpillar

Illustration 1 g02631557
Propel Motors and Final Drives (1) Left final drive (2) Left propel motor (3) Brake shift port (4) Right propel motor (5) Right final drive (6) Brake shift port (7) Speed sensorEach propel motor (2) and (4) is a single speed piston type motor. A propel motor drives each track through two speed planetary final drives (1) and (5). The ports on the motors are marked for identification. On the right motor, port "B" is the forward port and port "A" is the reverse port. On the left motor, port "A" is the forward port and port "B" is the reverse port. Each motor is equipped with speed sensor (7). A gear on the output shaft of the motor rotates past the tip of the speed sensor. Each time a tooth passes the sensor, two electrical impulses are sent to the machine ECM. These impulses are out of phase with one another. The machine ECM converts the frequency of the impulses to a vehicle speed and the phase of the impulses into a travel direction.
Illustration 2 g02631576
Propel Motor Cross Section (8) Charge relief valve (9) Flushing relief valve (10) Valve plate (11) Piston (12) Cylinder block (13) Slipper feet (14) Case drain (15) Swashplate (16) Output shaft (17) Flushing spoolThe right propel motor and left propel motor are identical. Each propel motor is a single speed piston type motor. The motor contains flushing relief valve (9). When the machine is moving, supply oil from the propel pump enters the motor. Supply oil is directed to the inlet port of valve plate (10). Supply oil is also directed to the flushing spool. The valve plate directs oil into the piston chamber in cylinder block (12). This pressure forces the pistons which are aligned with the inlet port to move out of the cylinder block.As pistons (11) are forced out of cylinder block (12), slipper feet (13) slide along swashplate (15) .This action causes the cylinder block and pistons to rotate. Since the cylinder block is splined to output shaft (16), the output shaft also rotates. As cylinder block (12) rotates, pistons (11) align with the outlet port in valve plate (10). The rotation of the cylinder block forces oil out of the piston chambers and into the low-pressure side of the hydrostatic loop. Low-pressure oil acts against flushing relief valve (9). 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 flushing spool (17), 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 flushing relief valve (9). The flushing relief valve opens, which allows oil in the low-pressure circuit to flow into motor case drain (14).