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| Illustration 1 | g06316774 |
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(1) Sequence valve
(2) Intensifier valve (3) Cylinder (Jaw) (4) Regenerative valve (5) Pilot valve (6) Manifold (7) Swivel (8) Gerotor motor (9) Crossover relief valve (11) Auxiliary control valve (rotate circuit) (12) Medium pressure pump (13) Hydraulic tank (14) Auxiliary control valve ( jaw circuit) | |
The hydraulic system for the Multi-Processor is divided into two separate circuits. One circuit is used to rotate the work tool. One circuit is used to operate the jaw.
- The hydraulic circuit for the operation of the jaws
The main components of this circuit consist of the following components : hydraulic pump, auxiliary control valve (14), hydraulic tank (13), swivel (7), cylinder (3), manifold (6), pilot valve (5), regen valves (4), intensifier valves (2) and sequence valves (1).
- The hydraulic circuit for the rotation of the work tool
The main components of this circuit consist of the following components : pump (12), auxiliary control valve (11), hydraulic tank (13), flow control valves (10), crossover relief valves (9) and gerotor motor (8).
Note: The following components are components of the host machine: hydraulic pumps, pump (12), auxiliary control valve (11), auxiliary control valve (14) and hydraulic tank (13). These items are not thoroughly discussed in this module. Refer to the Service Manual for the host machine for more information on these components.
Cylinder (3) is a double acting cylinder. The function of cylinder (3) is open and close the jaws. This function of the work tool operates independently of the rotation hydraulic system. The cylinder jaws open function operates at a pressure of
Swivel (7) is mounted in the center of the hydraulic rotator assembly. The swivel provides the necessary transfer of hydraulic oil from the input lines of the work tool to the hydraulic cylinder. The swivel (7) allows the work tool to rotate 360 degrees without damaging the cylinder lines.
When hydraulic oil is supplied to the head end of the cylinder, the rod is extended out of the cylinder causing the jaws of the work tool to close. When hydraulic oil is supplied to the rod end of the cylinder, the rod retracts into the cylinder causing the jaws of the work tool to open.
A speed control valve is used to decrease the time that is needed to close the jaws. Regen valve (4) diverts displaced oil at the rod end of the cylinder to flow into the head end of the cylinder. The increase in flow of the hydraulic oil causes the cylinder to extend faster. The increase in the flow of the hydraulic oil decreases the amount of time that is required to close the jaws. Refer to Service Manual, "Speed Control Valve" for further information.
Gerotor motor (8) is mounted in the hydraulic rotator assembly. The gerotor motor is driven by hydraulic oil that is supplied from the pump on the host machine. The hydraulic oil is diverted to the motor by auxiliary control valve (11). The oil flows to the work tool through the couplings that are located on the rotator. Flow control valves (10) are located within the couplings. The flow valves help to limit the amount of flow to the gerotor motor.
Note: The flow control valves are used as a backup device. The host machine must be set to the specified flow and to the specified pressure.
The direction of the auxiliary control valve determines the direction of the oil flow to the motor. Oil flows through the orifice in flow control valves (10) from the host machine. From the flow valves, the oil flows into crossover relief valve (9) and into gerotor motor (8). The flow of oil causes the motor to rotate. The output gear on the motor meshes with the gear and bearing. The gear and bearing allow the lower housing to rotate while the upper housing remains stationary. When the output gear of the motor acts on the gear and bearing, the lower housing rotates in the opposite direction.
Crossover relief valves (9) release the excess pressure that is in the rotate circuit. The pressure setting of each relief valve is
Note: The host machine must be set to the specified flow and to the specified pressure.
Rotate Circuit (Normal Operation)
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| Illustration 2 | g06311459 |
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(7) Swivel
(8) Gerotor motor (9) Crossover relief valve (11) Auxiliary control valve (rotate circuit) (12) Medium pressure pump (13) Hydraulic tank | |
Illustration 2 demonstrates normal operation. In this demonstration, the operator activates auxiliary control valve (11). The left side of the valve is active. Pressurized oil flows through auxiliary control valve (11) to flow control valve (10). As oil flows through the flow control valve, a slight reduction in pressure occurs across the orifice. Oil flows from flow control valve (10) to crossover relief valves (9). Reduced pressure oil is felt at the relief valves. When the pressure is below
Rotate Circuit (Above
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| Illustration 3 | g06311460 |
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(7) Swivel
(8) Gerotor motor (9) Crossover relief valve (11) Auxiliary control valve (rotate circuit) (12) Medium pressure pump (13) Hydraulic tank | |
Illustration 2 represents the rotate circuit when a crossover relief valve is activated. The operator activates auxiliary control valve (11). The left side of the valve is active in this demonstration. Pressurized oil flows through auxiliary control valve (11) to flow control valve (10). As oil flows through flow control valve (10), a slight reduction in pressure occurs across the orifice. Oil flows from flow control valve (10) to crossover relief valves (9). Reduced pressure is felt at the relief valves. When the pressure at the relief valve exceeds