BOOM RAISE Operation
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| Illustration 1 | g01181161 |
(1) Pressure sensor (boom cylinder rod end) (2) Line (3) Boom Cylinders (4) Passage (5) Valve (boom lowering control) (6) Valve (inching) (7) Sensor (boom angle) (8) Boom load control valve (9) Check valve (10) Port (11) IQAN controller (12) Logic valve (boom cylinder rod end) (13) Line (14) Pressure sensor (boom cylinder head end) (15) Solenoid valve (accumulator) (16) Manifold (solenoid) (17) Solenoid (accumulator) (18) Line (19) Main control valve (20) Boom I control valve (21) Line (22) Solenoid valve (boom raise) (23) Solenoid (boom raise) (24) Pilot line (25) Solenoid valve (power shift pressure) (26) Solenoid (power shift pressure) (27) Solenoid valve (rod end) (logic valve) (28) Solenoid (power shift pressure) (29) Solenoid valve (accumulator) (logic valve) (30) Solenoid (accumulator) (logic valve) (31) Pilot line (32) IQAN controller (33) Pressure sensor (gas) (34) Temperature sensor (gas) (35) Accumulator (high pressure) (36) Pressure sensor (oil) (37) Logic valve (accumulator) (38) Pilot line (accumulator) (logic valve) (39) Pilot control valve (boom and bucket) (40) Pressure sensor (pilot oil) (boom raise) (41) Proportional reducing valve (accumulator) (42) Check valve (43) Hydraulic activation control valve (44) Pilot oil manifold (45) Line (46) Upper pump (47) Lower pump (48) Pilot pump (49) Piston pump (accumulator) (50) Solenoid (pump control) (boom raise) (51) Servo valve (52) Passage (53) Passage (54) Hydraulic tank (55) Piston pump (boom) (56) Passage (57) Relief valve (pilot) (58) Valve (59) Solenoid | |
A BOOM RAISE operation is accomplished when the oil from accumulator (35) is delivered through pump (55) to the head end of boom cylinders (3) .
Note: The oil delivery from the main pumps is not used in order to raise the boom.
When pilot control valve (39) for the boom is moved to the BOOM RAISE position, the following will take place:
IQAN controller (11) reads the pilot oil pressure from the pilot valve from pressure sensor (40). The controller will then send a pulse width modulated signal (PWM) to solenoid (50) in order to shift servo valve (51) in pump (55) .
IQAN controller (11) will also send a PWM signal to solenoid (30). Solenoid (30) will shift valve (29). Pilot oil will flow through line (38) to valve (37). Valve (37) will shift in order to allow oil from accumulator (35) to flow through line (53) to valve (58). The oil will then flow through passage (52) and passage (56) to line (21) to the boom load check valves. Oil will flow through passages (4), check valves (9), and ports (10) to the head end of boom cylinders (3) .
IQAN controller (11) will also send a PWM signal to solenoid (28). Solenoid (28) will shift valve (27). Pilot oil will flow through line (24) to valve (12). Valve (12) will shift in order to allow return oil from the rod end of boom cylinders (3) to flow through line (2) and valve (12) to hydraulic tank (54) .
BOOM LOWER Operation
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| Illustration 2 | g01181165 |
(1) Pressure sensor (boom cylinder rod end) (2) Line (3) Boom Cylinders (4) Passage (5) Valve (boom lowering control) (6) Valve (inching) (7) Sensor (boom angle) (8) Boom load control valve (9) Check valve (10) Port (11) IQAN controller (12) Logic valve (boom cylinder rod end) (13) Line (14) Pressure sensor (boom cylinder head end) (15) Solenoid valve (accumulator) (16) Manifold (solenoid) (17) Solenoid (accumulator) (18) Line (19) Main control valve (20) Boom I control valve (21) Line (24) Pilot line (25) Solenoid valve (power shift pressure) (26) Solenoid (power shift pressure) (27) Solenoid valve (rod end) (logic valve) (28) Solenoid (power shift pressure) (29) Solenoid valve (accumulator) (logic valve) (30) Solenoid (accumulator) (logic valve) (31) Pilot line (32) IQAN controller (33) Pressure sensor (gas) (34) Temperature sensor (gas) (35) Accumulator (high pressure) (36) Pressure sensor (oil) (37) Logic valve (accumulator) (38) Pilot line (accumulator) (logic valve) (39) Pilot control valve (boom and bucket) (41) Proportional reducing valve (accumulator) (42) Check valve (43) Hydraulic activation control valve (44) Pilot oil manifold (45) Line (46) Upper pump (47) Lower pump (48) Pilot pump (49) Piston pump (accumulator) (51) Servo valve (52) Passage (53) Passage (54) Hydraulic tank (55) Piston pump (boom) (56) Passage (57) Relief valve (pilot) (58) Valve (59) Solenoid (60) Passage (61) Pilot line (boom lowering control valve) (62) Solenoid valve (boom lowering control) (63) Solenoid (boom lowering control) (64) Pilot line (inching) (65) Solenoid valve (inching) (66) Solenoid (inching) (67) Pressure sensor (pilot oil) (boom lower) (68) Solenoid (pump control) (boom lower) | |
A BOOM LOWER operation is accomplished when the oil from the head end of boom cylinders (3) is allowed to flow through boom load check valves (8) to the hydraulic tank and/or accumulator (35) .
Note: The oil delivery from the main pumps is not used in order to lower the boom.
Slow BOOM DOWN
When pilot control valve (39) for the boom is slightly moved to the BOOM LOWER position, the following will take place:
IQAN controller (11) reads the pilot oil pressure from the pilot valve from pressure sensor (67) .
IQAN controller (11) will send a PWM signal to solenoid (28). Solenoid (28) will shift valve (27) in order to allow pilot oil to flow through pilot line (24) to logic valve (12). Logic valve (12) will shift in order to allow oil from the hydraulic tank to flow through line (2) to the rod end of the boom cylinders.
IQAN controller (11) will send a PWM signal to solenoid (66). Solenoid (66) will shift valve (65) in order to allow pilot oil to flow through pilot line (64) to inching valve (6). Inching valve (6) will shift in order to allow oil from the head end of the boom cylinders to flow through passages (60) to the hydraulic tank. The boom will lower slowly.
BOOM DOWN
As the movement of pilot control valve (39) is increased, the pilot pressure at pressure sensor (67) will also increase. IQAN controller (11) will read the increased pressure. Valve (62) will open in order to allow pilot oil to flow through pilot line (61). Pilot oil pressure in pilot line (61) will open lowering control valves (5) .
IQAN controller (11) will also send a PWM signal to solenoid (30). Solenoid (30) will shift valve (29). Pilot oil will flow through line (38) to valve (37). Valve (37) will shift in order to allow oil to accumulator (35) .
IQAN controller (11) will also send a PWM signal to solenoid (68) in order to shift servo valve (51) in pump (55). The return oil from the boom cylinders will now flow through lowering control valves (5), passages (4), and return line (21) to valve (58). The return oil will then flow through passage (56) and passage (52) through pump (55). The oil will flow through valve (58), line (53), and valve (37) to accumulator (35) .
Fast BOOM DOWN
When pilot control valve (39) for the boom is moved to the full BOOM LOWER position, IQAN controller (11) will also send a PWM signal to solenoid (66). Inching valve (6) will open and return oil will flow to the hydraulic tank and to accumulator (35). This will allow the boom to lower at maximum speed.
When the pilot control valve for the boom is returned to the NEUTRAL position, IQAN controller (11) will close valve (37) and the energy from the boom down operation will be stored in accumulator (35) .
Boom Float
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| Illustration 3 | g01174848 |
(1) Pressure sensor (boom cylinder rod end) (2) Line (3) Boom Cylinders (4) Passage (5) Valve (boom lowering control) (6) Valve (inching) (7) Sensor (boom angle) (8) Boom load control valve (10) Port (11) IQAN controller (12) Logic valve (boom cylinder rod end) (13) Line (14) Pressure sensor (boom cylinder head end) (16) Manifold (solenoid) (21) Line (24) Pilot line (35) Accumulator (high pressure) (37) Logic valve (accumulator) (38) Pilot line (accumulator) (logic valve) (39) Pilot control valve (boom and bucket) (43) Hydraulic activation control valve (46) Upper pump (47) Lower pump (48) Pilot pump (49) Piston pump (accumulator) (53) Passage (55) Piston pump (boom) (58) Valve (59) Solenoid (61) Pilot line (boom lowering control valve) (62) Solenoid valve (boom lowering control) (63) Solenoid (boom lowering control) (67) Pressure sensor (pilot oil) (boom lower) (69) Valve (boom float) (70) Solenoid (boom float) (71) Logic valve (boom float) (72) Proportional reducing valve (boom float) (73) Pilot line | |
In order to turn on the boom float function, push the boom float switch to the ON position. The boom float function can now be activated. In order to activate the boom float function, hold down the boom float control on the front of the right joystick.
IQAN controller (11) will send a PWM signal to solenoid (70). Solenoid (70) will shift valve (69) in order to allow pilot oil to flow through pilot line (73) to logic valve (71). Logic valve (71) will open in order to allow oil from the head end of the boom cylinders to flow to the accumulator. Oil from the rod end of the boom cylinders is connected to the tank by logic valve (12) .
Note: During the boom float function, the head end of the boom cylinder is connected to the accumulator. The amount of down pressure that is applied by the bucket to the ground is controlled by proportional reducing valve (72). Proportional reducing valve (72) is controlled by sensor (7) (boom angle) and the boom down pilot pressure.
IQAN controller (11) reads the pilot oil pressure from the pilot valve from pressure sensor (67) .
When pilot control valve (39) is moved to the BOOM LOWER, IQAN controller (11) will send a PWM signal to solenoid (63). Valve (62) will open in order to allow pilot oil to flow through pilot line (61). Pilot oil pressure in pilot line (61) will open the lowering control valves (5) .