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| Illustration 1 | g01424446 |
Implement Electronic Control System (1) Tilt cylinder (2) Lift cylinder (3) Switch (hydraulic lockout) (4) Lift/lower kickout switch (5) Tilt kickout switch (6) Shuttle valve (7) Pressure reducing valve (8) Tilt linkage position sensor (9) Lift linkage position sensor (10) Main control valve (left) (11) Float valve (left) (12) Float valve (right) (13) Main control valve (right) (14) Cat Data Link (15) Implement electronic control module (ECM) (16) Hydraulic lockout valve (17) Tilt lever position sensor (18) Lift lever position sensor (19) Pilot pump (20) Implement pump (180 cc (11.0 in3)) (21) Implement pump (250 cc (15.3 in3))(right) (22) Implement pump (250 cc (15.3 in3))(center) (23) Hydraulic tank | |
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| Illustration 2 | g01424480 |
Implement control lever module (3) Switch (hydraulic lockout) (24) Tilt control lever (25) Lift control lever | |
Tilt control lever (24) and lift control lever (25) are located on the right side of the operator seat. Position sensors (17, 18) for the control levers are located beneath the cover of implement control lever module.
Switch (3) is an input to implement electronic control module (15) . When switch (3) is in the UNLOCKED position and the engine start switch is in the ON position, the implement ECM energizes hydraulic lockout valve (16) . Pilot oil flows to the pilot control actuators on main control valves (10, 13) and the stems in the main control valves can be commanded to move with movement in one of the control levers. If switch (3) is in the LOCKED position, pilot oil to the pilot control actuators is blocked.
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| Illustration 3 | g01424491 |
Right side console (4) Lift/lower kickout switch (5) Tilt kickout switch | |
Kickout set switches (4, 5) are located on the control console on the right side of the operator compartment. The kickout set switches are used to set the kickouts to the desired positions.
To set the bucket kickout position, tilt the bucket to the desired LOADING position. When the tilt control lever returns to the HOLD position, press the top of tilt kickout switch (5) for approximately 2 seconds. Then, release the switch.
To set the lower kickout position, lower the bucket to the desired position below the midway point. When the lift control lever returns to the HOLD position, press the bottom of lift/lower kickout switch (4) for approximately 2 seconds. Then, release the switch.
To set the lift kickout position, raise the bucket to the desired position above the midway point. When the lift control lever returns to the HOLD position, press the top of lift/lower kickout switch (4) for approximately 2 seconds. Then, release the switch.
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| Illustration 4 | g01424508 |
Left side of loader frame (Pin F) (8) Tilt linkage position sensor | |
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| Illustration 5 | g01424510 |
Right side of loader frame (Pin A) (9) Lift linkage position sensor | |
Tilt linkage position sensor (8) is bolted to the left side of the lift arm near the linkage pin (Pin F). Lift linkage position sensor (9) is bolted to the right side of the lift arm near the linkage pin (Pin A). The position sensors constantly monitor the position of the appropriate linkage. This information is sent to the implement ECM.
When the operator moves an implement control lever, a pulse width modulated signal (PWM) is sent to the ECM. The ECM analyzes the signal from the following sensors:
- Tilt linkage position sensor (8)
- Lift linkage position sensor (9)
- Tilt lever position sensor (17)
- Lift lever position sensor (18)
Then, the ECM sends a proportional current to the respective pilot control actuator.
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| Illustration 6 | g01424791 |
Electronics bay (15) Implement ECM | |
The electronics bay is located on the lower right side of the cab.
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| Illustration 7 | g01424828 |
(16) Hydraulic lockout valve | |
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| Illustration 8 | g01424830 |
Main control valve (10) Main control valve (left) (13) Main control valve (right) (26) Pilot control actuators | |
Hydraulic lockout valve (16) is located inside the loader frame on the left side of the machine. When hydraulic lockout valve (16) is de-energized, pilot oil is blocked. When the solenoid is energized, pilot oil is allowed to flow to pilot control actuators (26) . Hydraulic lockout valve (16) is energized whenever the engine start switch is in the ON position and the switch (hydraulic lockout) (3) is in the UNLOCKED position.
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| Illustration 9 | g01424869 |
Pump drive and implement pumps (top view) (20) Implement pump (180 cc (11.0 in3)) (21) Implement pump (250 cc (15.3 in3))(right) (22) Implement pump (250 cc (15.3 in3))(center) (27) Solenoid valve for variable displacement pump | |
One solenoid valve (27) is located on each of the variable displacement pumps. This solenoid valve controls the pilot pressure to the control valve for displacement control on the pump control for the variable displacement piston pump. Current to the solenoid valve is increased when the engine speed is greater than 1350 rpm. The increase decreases pressure on the piston for the displacement control.
ReferenceFor additional information about the operation of the variable displacement piston pump, refer to the Service Manual module Systems Operation, "Pump Control Operation (Variable Displacement)" for the machine that is being serviced.