The leveling system is used for cutting applications on steep slopes. The system levels the cab for this type of application. The system improves the stability of the machine.
The cab on the machine can be tilted to the left or to the right. The cab can be tilted forward or backward.
The leveling system contains the following components.
- Side leveling control valve
- Forward leveling control valve
- Forward level cylinder
- Side level cylinders
The control valves for the leveling system are mounted in the travel control valve.
The travel control valve is located on the hydraulic tank.
The cylinders are mounted on the frame.
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| Illustration 1 | g02585037 |
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(1) Travel control valve
(2) Proportional solenoid valves (side) (3) Proportional solenoid valves (forward) (4) Travel control valve (left) (5) Side leveling control valve (6) Forward leveling control valve (7) Travel control valve (right) (P1) Supply port (T1) Tank port | |
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| Illustration 2 | g01474461 |
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Machine Leveling (1) Travel control valve (2) Proportional solenoid valves (side tilt) (3) Proportional solenoid valves (forward) (4) Travel control valve (left) (5) Side leveling control valve (6) Forward leveling control valve (7) Travel control valve (right) (8) Swivel (9) Forward tilt cylinder (10) Counterbalance valve (11) Side tilt cylinder (12) Counterbalance valves (13) Side tilt cylinder (A) Line from the pilot hydraulic system (B) Line from the main pumps (C) Line to the hydraulic tank | |
The leveling system is controlled by the left joystick and the right joystick inside the cab. The buttons on the left joystick regulate the LEFT LEVEL or the RIGHT LEVEL function. The buttons on the right joystick regulate the FORWARD LEVEL or the BACKWARD LEVEL function.
When the operator presses the button for LEFT LEVEL, a signal is sent to the IQAN control system. The IQAN control system sends a signal to proportional solenoid valve (2).
Pilot oil supplied by the pilot hydraulic system flows through line (A) through the proportional solenoid valve to side leveling control valve (5). The spool of side leveling control valve (5) shifts. This shifting allows pump oil from the main pumps to flow from line (B) through side leveling control valve (5). Pump oil also flows through swivel (8) to counterbalance valves (12) of side leveling cylinders (11) and (13).
Pump oil also flows into the circuit for the signal pressure. The signal limiter valve limits the pressure in the signal circuit. The pressure setting of the signal limiter valve controls the maximum signal pressure to the main pumps. The pressure setting is adjustable.
The pump oil flows through counterbalance valves (12) to the rod of side level cylinder (11) and to the head of side level cylinder (13).
Return oil flows from the head of side level cylinder (11) and from the rod of side level cylinder (13) through counterbalance valves (12). The return oil flows through side level control valve (5) through line (C) to the oil cooler. The return oil flows from the oil cooler to the hydraulic tank. The cab will level to the LEFT position.
When the operator presses the button for RIGHT LEVEL, a signal is sent to the IQAN control system. The IQAN control system sends a signal to proportional solenoid valve (2).
Pilot oil supplied by the pilot hydraulic system flows through line (A) through the proportional solenoid valve to side leveling control valve (5). The spool of side leveling control valve (5) shifts. This shifting allows pump oil from the main pumps to flow from line (B) through side leveling control valve (5). Pump oil also flows through swivel (8) to counterbalance valves (12) of side leveling cylinders (11) and (13).
Pump oil also flows into the circuit for the signal pressure. The signal limiter valve limits the pressure in the signal circuit. The pressure setting of the signal limiter valve controls the maximum signal pressure to the main pumps. The pressure setting is adjustable.
The pump oil flows through counterbalance valves (12) to the head of side level cylinder (11) and to the rod of side level cylinder (13).
Return oil flows from the rod of side level cylinder (11) and from the head of side level cylinder (13) through counterbalance valves (12). The return oil flows through side leveling control valve (5) through line (C) to the oil cooler. The return oil flows from the oil cooler to the hydraulic tank. The cab will level to the RIGHT position.
When the operator presses the button for FORWARD LEVEL, a signal is sent to the IQAN control system. The IQAN control system sends a signal to proportional solenoid valve (3).
Pilot oil supplied by the pilot hydraulic system flows through line (A) through the proportional solenoid valve to forward leveling control valve (6). The spool of forward leveling control valve (6) shifts. This shifting allows pump oil from the main pumps to flow from line (B) through forward leveling control valve (6). The pump oil also flows through swivel (8) to counterbalance valve (10) of forward level cylinder (9).
Pump oil also flows into the circuit for the signal pressure. The signal limiter valve limits the pressure in the signal circuit. The pressure setting of the signal limiter valve controls the maximum signal pressure to the main pumps. The pressure setting is adjustable.
The pump oil flows through counterbalance valve (10) to the head of forward level cylinder (9).
Return oil flows from the rod of forward level cylinder (9) through counterbalance valve (10). The return oil flows through forward leveling control valve (6) through line (C) to the oil cooler. The return oil flows from the oil cooler to the hydraulic tank. The cab will level to the FORWARD position.
When the operator presses the button for BACKWARD LEVEL, a signal is sent to the IQAN control system. The IQAN control system sends a signal to proportional solenoid valve (3).
Pilot oil supplied by the pilot hydraulic system flows through line (A) through the proportional solenoid valve to forward leveling control valve (6). The spool of forward leveling control valve (6) shifts. This shifting allows pump oil from the main pumps to flow from line (B) through forward leveling control valve (6). Pump oil also flows through swivel (8) to counterbalance valve (10) of forward level cylinder (9).
Pump oil also flows into the circuit for the signal pressure. The signal limiter valve limits the pressure in the signal circuit. The pressure setting of the signal limiter valve controls the maximum signal pressure to the main pumps. The pressure setting is adjustable.
The pump oil flows through counterbalance valve (10) to the rod of forward level cylinder (9). The cab will level to the BACKWARD position.
Return oil flows from the head of forward level cylinder (9) through counterbalance valve (10). The return oil flows through forward leveling control valve (6) through line (C) to the oil cooler. The return oil flows from the oil cooler to the hydraulic tank.
Reference: For more information about the pilot hydraulic system, refer to Systems Operation/Testing and Adjusting, "Pilot Hydraulic System".
Reference: For more information about the main pumps, refer to Systems Operation/Testing and Adjusting, "Piston Pump (Main Hydraulic)".