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| Illustration 1 | g02712902 |
Hydraulic schematic for implement system (1) Tilt cylinder (2) Relief valve (line) (3) Lift cylinders (4) Ride control accumulator (5) Ride control valve (6) Relief valve (line) (7) Solenoid valve (hydraulic lockout) (8) Manual valve (dead engine lower) (9) Main control valve (10) Solenoid valve (pilot proportioning) (11) Pilot oil accumulator (12) Pressure reducing valve (13) Relief valve (load sensing signal) (14) Implement pump (15) Hydraulic tank (A) Implement ECM (B) Power Train ECM (C) Tilt lever position sensor (D) Lift lever position sensor (E) Auxiliary lever position sensor (F) Switch (hydraulic lockout) (G) Kickout set switch (H) Autodig trigger switch (optional) (J) Dig mode switch (optional) (K) Operation mode switch (Autodig System) (L) Autodig kickout set switch (M) Position sensor (lift) (N) Position sensor (tilt) (P) Position sensor (auxiliary) (R) Pressure sensor (lift) | |
Note: Illustration 1 shows a machine with an auxiliary function. Machines without an auxiliary function will not have auxiliary section on main control valve (9). Machines without ride control will not have ride control valve (5) .
The electrohydraulic system is composed of the following systems:
- Implement electronic control system
- Pilot hydraulic system
- Main hydraulic system
- Ride control system
- Kickout system
Hydraulic tank (15) is common to all of the systems.
The implement electronic control system is made up of the following components:
- (7) solenoid valve (hydraulic lockout)
- (10) solenoid valves (pilot proportioning)
- (14) implement piston pump
- (A) implement ECM
- (C-E) control levers or joystick control
- (F-L) switches
- (M-R) sensors
ReferenceFor additional information about the implement electronic control system, refer to the Service Manual module Systems Operation, "Implement Electronic Control System" for the machine that is being serviced.
The pilot hydraulic system is made up of the following components:
- (7) Solenoid valve (hydraulic lockout)
- (10) Solenoid valve (pilot proportioning)
- (11) Pilot oil accumulator
- (12) Pressure reducing valve
- (F) Switch (hydraulic lockout)
The main hydraulic system is made up of the following components:
- (9) main control valve
- (1) tilt cylinder
- (3) lift cylinders
- (13) load sensing signal relief valve
- (14) implement piston pump
ReferenceFor additional information about the main control valve, refer to the Service Manual module Systems Operation, "Main Control Valve" for the machine that is being serviced.
The ride control system is made up of the following components:
- (3) lift cylinders
- (5) ride control valve
- (8) ride control accumulator
- (B) power train ECM
ReferenceFor additional information about the ride control system, refer to the Service Manual module Systems Operation, "Ride Control System" for the machine that is being serviced.
The kickout system is made up of the following components:
- (12) pressure reducing valve
- (A) implement ECM
- (C, D) control levers or joystick control
- (M) lift linkage position sensor
- (N) tilt linkage position sensor
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| Illustration 2 | g02712903 |
Right side view of machine (1) Tilt cylinder (3) Lift cylinders (4) Ride control accumulator (8) Manual valve (dead engine lower) (9) Main control valve (14) Implement pump (15) Hydraulic tank (A) Implement ECM (B) Power Train ECM (C) Tilt lever position sensor (D) Lift lever position sensor (E) Auxiliary lever position sensor (F) Switch (hydraulic lockout) (G) Kickout set switch (H) Autodig trigger switch (optional) (J) Dig mode switch (optional) (K) Operation mode switch (Autodig System) (L) Autodig kickout set switch (M) Position sensor (lift) (N) Position sensor (tilt) | |
Implement piston pump (14) is located under the cab. Pump (14) is mounted to the torque converter housing.
Hydraulic tank (15) is located behind the cab.
The ride control system provides a means for dampening the bucket forces which produce a pitching motion as the machine travels over a rough terrain.
ReferenceFor additional information on the operation of the ride control system, refer to Systems Operation, "Ride Control System" for the machine that is being serviced.
The manual valve (dead engine lower) (8) is located in front of the articulation joint. The manual valve is used in order to lower the lift arms when there is an electrical failure.
Implement ECM (A) is located in the cab behind the operator seat.
Implement piston pump (14) provides pump supply oil to main control valve (9). A remote pressure tap for measuring implement pressure is located at the articulation joint on the right side.
Implement piston pump (14) also supplies pilot oil pressure to the pilot system. A pressure tap for measuring pilot pressure is in front of the articulation joint on the right side of the machine.
Main control valve (9) is mounted in the loader frame.
Load sensing signal relief valve (13) is mounted on the main control valve. Line relief valves (2, 6) are also attached to the main control valve. The main control valve controls the pump supply oil to the implement cylinders.
ReferenceFor additional information about the main control valve, refer to the Service Manual module Systems Operation, "Main Control Valve" for the machine that is being serviced.
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| Illustration 3 | g02433556 |
Right side operator controls (C) Tilt control lever (D) Lift control lever (E) Auxiliary control lever (F) Switch (hydraulic lockout) | |
The switch (hydraulic lockout) (F), tilt control (C), lift control (D), and auxiliary control (E) are located to the right of the operator seat.
Note: Illustration 3 shows a machine with an auxiliary function. Machines without an auxiliary function will not have auxiliary control lever (E) .
ReferenceFor information on the implement control levers, refer to Systems Operation, "Implement Electronic Control System" for the machine that is being serviced.
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| Illustration 4 | g02724900 |
Joystick control (Top view) (C) Tilt control lever (D) Lift control lever (E) Auxiliary control lever | |
The machine can be equipped with a joystick control. The joystick control can be equipped with either two position sensors or three position sensors. The sensor for the third function is controlled by the thumb wheel that is built into the joystick handle. The position sensors send the position of the joystick handle to the implement (ECM). Both the joystick control and the single axis levers are equipped with soft detents.
Note: Some machines may be equipped with an optional fourth function. The operation of the fourth function is identical to the auxiliary function.