- Wheel Harvester :
- 550B (S/N: SAW1-UP)
- 560B (S/N: TRA1-UP)
- 570B (S/N: CKG1-UP)
- 580B (S/N: CLT1-UP)
Portions of the existing information are incorrect. Replace the existing section for the Pendulum Hydraulics System with the following information.
The pendulum hydraulics system controls the movement of the pendulum arms with cylinders. The cylinders are controlled by a joystick control or by switches in the cab of the machine.
The system consists of the following components: pendulum arm lock valve, pendulum arm joystick, switches, IQAN monitoring and control system, pendulum arm control valve and pendulum arm cylinders. The pendulum arm control valve and the pendulum arm lock valve are located on the right side of the machine in front of the implement pump and power train pumps.
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| Illustration 1 | g00857633 |
Diagram of the Controls for the Pendulum hydraulics System (1) Left/Right pendulum arm switch. (2) Forward/Backward Level Switch for the pendulum arm. (3) Up/Down level switch. (4) Joystick for the pendulum arm. | |
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| Illustration 2 | g00658954 |
Detail of the Pendulum Arm Joystick (3) Up/Down level switch. (4) Joystick for the pendulum arm. | |
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| Illustration 3 | g00658959 |
(5) Switch for left front pendulum arm. (6) Switch for right front pendulum arm. (7) Switch for left rear pendulum arm. (8) Switch for right rear pendulum arm. (9) Pendulum arm lock switch. | |
The pendulum hydraulics system allows the operator to move one pendulum arm at a time. Also, the pendulum hydraulics system allows the operator to move several pendulum arms at one time. Joystick (4) allows the operator to tilt the machine in any direction. As the distance of the joystick from the HOLD position increases, the speed of the pendulum arms increase. The center of the machine stays stationary when joystick (4) is moved. For example, when joystick (4) is moved forward, the front pendulum arms lower and the rear pendulum arms raise.
Up/down level switch (3) allows the operator to move the entire machine up and down. As switch (3) is depressed further, the pendulum arms will move faster.
Switches (1), (2), (5), (6), (7), and (8) are on/off switches. When the switch is depressed, the pendulum arm(s) will move at a constant rate.
Note: The rate of movement for the pendulum arms can be adjusted with the IQAN. For more information on adjusting the controls for the pendulum arms, refer to the Service Manual module for Testing and Adjusting, "Pendulum Arm Control - Test and Adjust" for the machine that is being serviced.
Switch (9) is used to prevent oil from flowing between the pendulum arm cylinders when the machine is moving.
Note: During normal operation, switch (9) for the pendulum arm lock valve should be in the UNLOCKED position.
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| Illustration 4 | g00976320 |
Top View of the Pendulum Arm Control Valve (A) Drain port (B) Pilot pressure port (C) Signal port (IN) (D) Signal port (OUT) (E) Tank port (F) Pump pressure port (G) Port for rear arms to the DOWN position (H) Port for front arms to the DOWN position (J) Right front arm to the UP position (Port) (J) Also, when the pendulum arm lock valve is in the UNLOCKED position (floating), the right rear arm will also move to the UP position. (K) Right rear arm to the UP position (Port) (K) Also, when the pendulum arm lock valve is in the UNLOCKED position (floating), the right front arm will also move to the UP position. (L) Left front arm to the UP position (Port) (L) Also, when the pendulum arm lock valve is in the UNLOCKED position (floating), the left rear arm will also move to the UP position. (M) Left rear arm to the UP position (Port) (M) Also, when the pendulum arm lock valve is in the UNLOCKED position (floating), the left front arm will also move to the UP position. | |
The pendulum arm control valve controls the flow of oil to the pendulum arm cylinders. The control valve does not contain a main relief valve. The proportional solenoids in the valve control the flow of pilot oil to the spools in each valve section. The pilot oil is generated by a pilot valve in the implement control valve. The pilot oil flows from the implement control valve, through a pilot oil filter, and to the pendulum arm control valve.
Reference: For additional information about the proportional solenoids, refer to the Service Manual module Systems Operation, "Monitoring and Control System".
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| Illustration 5 | g01011701 |
Schematic of the Pendulum Hydraulics System (10) Pendulum arm control valve for rear pendulum arm cylinders to the DOWN position (11) Pendulum arm control valve for the front pendulum arm cylinders to the DOWN position (12) Pendulum arm control valve for the right front pendulum arm cylinder to the UP position (12) Also, when the pendulum arm lock valve is in the UNLOCKEDposition (floating), the right rear pendulum arm cylinder will also move to the UP position. (13) Pendulum arm control valve for the right rear pendulum arm cylinder to the UP (13) Also, when the lock valve is in the UNLOCKED position (floating), the right front pendulum arm cylinder will also move to the UP position. (14) Pendulum arm control valve for the left front pendulum arm cylinder to the UP position (14) Also, when the pendulum arm lock valve is in the UNLOCKED position (floating), the left rear pendulum arm cylinder will also move to the UP position. (15) Pendulum arm control valve for the left rear pendulum arm cylinder to the UP position (15) Also, when the pendulum arm lock valve is in the UNLOCKED position (floating), the left front pendulum arm cylinder will also move to the UP position. (16) Orifice (17) Pendulum arm lock valve (18) Right front arm (19) Right rear arm (20) Left rear arm (21) Left front arm (22) High pressure signal reducing valve (B) Pilot oil line (C) Signal line (F) Pressure line | |
HOLD Position
When the pendulum arms are not being moved with a switch or the joystick, the arms are in the HOLD position. Pressure oil flows from the implement pump to port (F) of the control valve.
Some pressure oil leaks through orifice (16) to the hydraulic oil tank. Leakage to the tank ensures that warm oil will always be in the circuit for the signal lines. This warm oil will provide better response as the function is activated.
Pendulum arm lock valve (17) is in the UNLOCKED position (floating) when the machine is off. When you start the machine, the solenoid will become energized. Then, move the spool in pendulum arm lock valve (17) to the LOCKED position.
When pendulum arm lock switch (9) is in the ON position, pendulum arm lock valve (17) is in the LOCKED position (LEFT position). The valve will remain in the LOCKED position, even when the accelerator pedal is pressed. The valve prevents oil from flowing between cylinders (18), (19), (20), and (21) for the pendulum arms. The individual cylinders can still be moved with the switches on the switchboard.
Note: When the pendulum arm lock switch is in the ON position the pendulum arms cannot be controlled by the joystick. During normal operation, switch (9) should be in the UNLOCKED position (floating).
If the pendulum arm lock switch is in the OFF position, the solenoid will be energized when you start the machine. Then, move the valve to the UNLOCKED position (floating) when the accelerator pedal is pressed. The head ends of the cylinders are connected from the front to the back through the lock valve. The rod ends of the cylinders are connected from left to right. Oil will then flow between the cylinders as the machine moves.
When lock valve (17) is in the UNLOCKED position (floating), two cylinders are connected together by one spool function.
When the wheel harvester travels over an obstacle, oil flows between the cylinders for the pendulum arms. The system allows the pressure in the cylinders for the pendulum arms to remain equal. The system does not attempt to keep the machine level.
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| Illustration 6 | g00659096 |
Wheel Harvester that is Traversing an Obstacle | |
As an example, if the right rear wheel encounters an obstacle, the pressure in the head end of the right rear pendulum arm cylinder will increase. Oil will flow through the system in order to equalize the pressure. Illustration 6 shows the direction of oil flow between the cylinders. The flow of oil will cause the following actions:
- The right pendulum arm will raise.
- The right pendulum arm will lower.
- The left pendulum arm will raise.
- The left pendulum arm will lower.
Note: The operator must use the switches or the joystick to aid in the leveling of the machine while the operator travels over an obstacle.
Lowering A Pendulum Arm
When the operator lowers one or more pendulum arm, proportional solenoids in the pendulum arm control valve are activated by pilot oil. The valve spools block the flow of signal oil to the hydraulic oil tank. The pressure in the signal lines increases. The implement pump strokes to maximum output.
Valve sections (12), (13), (14), and (15) control the oil flow to the head end of one pendulum arm cylinder in order to raise the machine. Oil from the rod end of the cylinder flows to the hydraulic oil tank through valve sections (10) and (11) .
When the operator lowers the left rear pendulum arm, pilot oil flows to the top of the valve spool in valve section (15). The valve spool moves to the DOWN position. Pressure oil flows to the head end of pendulum arm cylinder (20) .
Pilot pressure oil then flows to the bottom of the valve spool in valve section (10). The valve spool moves to the UP position. Oil from the rod end of pendulum arm cylinder (20) flows through the valve spool to the hydraulic oil tank.
When the operator lowers the left front pendulum arm, the valve spool in valve section (14) moves to the DOWN position. Pressure oil flows to the head end of pendulum arm cylinder (18). Oil from the rod end of the cylinder flows back to the tank through the valve spool in valve section (11) .
Note: The operation of the right pendulum arms is similar.
Raising A Pendulum Arm
When the operator raises one or more pendulum arm, proportional solenoids in the pendulum arm control valve are activated. The valve spools block the flow of signal oil to the hydraulic oil tank. The pressure in the signal lines increases. The implement pump strokes to maximum output. The pump will upstroke to the pressure setting of relief valve (22) .
Valve spools (10) and (11) control the oil flow to the rod end of the front pendulum arm cylinders and the rear pendulum arm cylinders. To raise the wheel, the oil from the head end of a cylinder flows to the hydraulic oil tank through valve spools (12), (13), (14), and (15) .
When the operator raises the left rear pendulum arm, pilot oil flows to the top of the valve spool in valve section (10). The valve spool moves to the DOWN position. Pressure oil flows to the rod ends of the rear pendulum arm cylinder.
Pilot oil then flows to the bottom of the valve spool in section (15). The valve spool moves to the UP position. Oil from the head end of the left rear pendulum arm cylinder flows through the valve spool in section (15) to the hydraulic oil tank. Valve spool (13) prevents the right rear pendulum arm cylinder from moving.
When the operator raises the left front pendulum arm, pilot oil flows to the top of the valve spool in valve section (11). The valve spool moves to the DOWN position. Pressure oil flows to the rod ends of the front pendulum arm cylinder.
Pilot oil then flows to the bottom of the valve spool in section (14). The valve spool moves to the UP position. Oil from the head end of the left front pendulum arm cylinder flows through the valve spool in section (14) to the hydraulic oil tank. Valve spool (12) prevents the right rear pendulum arm cylinder from moving.
Note: The operation of the right pendulum arms is similar.