Location and Function
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| Illustration 1 | g00955856 |
(1) Right drag conveyor motor (2) Right planetary drive | |
Right drag conveyor motor (1) is located next to the engine fan on the right side of the machine. The right drag conveyor motor drives right planetary drive (2).
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| Illustration 2 | g00944507 |
(3) Left drag conveyor motor (4) Planetary drive | |
Left drag conveyor motor (3) is located next to the hydraulic tank compartment on the left side of the machine. The left drag conveyor motor drives left planetary drive (4) .
The left and right drag conveyor motors are an axial piston fixed displacement motor. The output shaft of the drag conveyor motor is splined to the planetary drive. The planetary drive turns a chain and sprocket that turns the drag conveyor.
Note: The left drag conveyor motor and left planetary drive are identical to the right drag conveyor motor and right planetary drive.
The drag conveyor motor will consume 44 cc (2.7 in3) of oil for every revolution of the motor.
Components
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| Illustration 3 | g00946643 |
Components for a Typical Piston Motor (3) End cap (4) Valve plate (5) Piston (6) Shaft (7) Motor housing (8) Swashplate (9) Cylinder assembly | |
Swashplate (8) is fixed in motor housing (7). The angle of this swashplate can not be changed.
Operation and Oil Flow
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| Illustration 4 | g00944509 |
Hydraulic Schematic for Left or Right Drag Conveyor Motor (1) Drag conveyor motor (10) Orifice (11) Test port (12) Line from drag conveyor pump (13) Line to drag conveyor pump (14) Line to oil cooler bypass manifold (AA) System pressure (AB) First pressure reduction (AC) Sump (AD) Activated components | |
Drag conveyor motor (1) receives system pressure oil from the drag conveyor pump through the line from drag conveyor pump (12). The speed (rpm) of the drag conveyor motor is directly proportional to the oil flow that is produced by the drag conveyor pump. Oil will flow through the drag conveyor motor and back to the drag conveyor pump through the line to drag conveyor pump (13). This return oil remains in the closed loop hydraulic system. This oil feeds the pump at port "A" on the pump.
Reference: See Systems Operation, "Piston Pump (Drag Conveyor)" for additional information about the drag conveyor pump.
The drag conveyor pump and drag conveyor motor work as a closed loop hydraulic system. In this type of hydraulic system, most of the oil in the system remains in the system.
Oil in a closed loop hydraulic system needs to be replenished for the following reasons:
- Oil lost through lubrication of the internal components.
- Oil lost through leakage from the internal components.
- Oil that is diverted to the oil cooler bypass manifold
Approximately 3.8 L/min (1 US gpm) of oil is diverted around the drag conveyor motor and through orifice (10). This oil is sent back to the hydraulic oil cooler through the line to oil cooler bypass manifold (14). The charge pump will continually replenish any oil that is lost in the closed loop hydraulic system. Also, the charge pump will deliver oil through the charge filter before sending new oil to the pump stacks. As a result, the oil in the closed loop hydraulic system will continually be cooled and filtered.
Test port (11) is used to check the system pressure when the piston pump is operating. When the piston pump is not operating, charge pressure can be checked at test port (11) .