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| Illustration 1 | g00701985 |
(1) Cavity, (2) Rotor set, (3) Port, (4) Port, (5) Output shaft and (6) Link | |
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| Illustration 2 | g00701885 |
(3) Port, (4) Port and (7) Gear | |
The gerotor motor is the component that rotates the work tool. Pressurized hydraulic oil is used to force the motor to turn. The motor can turn in a clockwise direction or in a counterclockwise direction. This allows the work tool to rotate in either direction.
Pressurized hydraulic oil enters port (3) or port (4) . The direction of the rotation that was selected by the operator determines the point of entry for the oil. When oil enters port (3) , the oil flows from the port into cavity (1) . Cavity (1) is the area that is formed by rotor set (2) . The pressurized hydraulic oil causes the rotor set to rotate. Return oil flows into port (4) from cavity (1) back to the hydraulic tank.
Rotor set (2) is splined to link (6) . Link (6) is splined to output shaft (5) . Gear (7) is mounted on shaft (6) . The gear meshes with the gear and bearing that is mounted between the upper housing and the lower housing. As gear (7) turns, the gear and bearing turn in the opposite direction. This causes the lower housing of the work tool to rotate in the direction that was selected by the operator.
When the opposite direction of rotation is selected, oil enters the motor at port (4) . The oil flows into cavity (1) from the port. The point of entry in cavity (1) from port (4) causes the oil to flow in the opposite direction. Return oil flows into port (3) from cavity (1) back to the hydraulic tank. The change in direction causes the work tool to rotate in the opposite direction.
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| Illustration 3 | g00701920 |
(8) Control valve | |
Control valve (8) is mounted to the gerotor motor on top of the two ports. This valve is used to relieve excess pressure in the motor circuit. Oil must flow through the control valve before the oil can enter the motor. Refer to Service Manual, "Control Valve" for further information.