615007L001 FLYWHEEL (Reference) Caterpillar parts
Rating:
Alternative (cross code) number:
CA615007L001
615007-L001
615007L001
CA615007L001
615007-L001
615007L001
Number on catalog scheme:
881
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Information:
Pump Control Group
Illustration 3 g01727434
Implement Pump Control (25) Sleeve. (26) Margin pressure adjustment screw. (27) Torque control piston. (28) Load sensing spool. (29) Horsepower adjustment screw. (30) Horsepower control spool. (A) Signal pressure from travel pump. (B) Signal pressure from implement pump. (C) Load sensing pressure from implement control valve. (D) Passage to the actuator piston.Illustration 3 shows the major components of the implement pump control. The pump control group of the travel pump contains the same components.Note: Power shift pressure is not used on either pump control group.Torque control piston (27) is a summing valve which combines the forces from signal pressure (A) and signal pressure (B) from the pumps.Load sensing spool (28) controls the margin pressure. The margin pressure is the difference between the pump system pressure and the work port pressure of the implements. The margin pressure adjustment screw can increase the margin pressure. The margin pressure adjustment screw can decrease the margin pressure.Horsepower control spool (30) directs signal pressure to the actuator piston or from the actuator piston. The signal pressure on the actuator piston controls the flow rate from the pumps.Note: The horsepower adjustment screws regulate the hydraulic horsepower output from the pumps.When the engine drops below 1850 rpm due to the pump load, turn both horsepower adjustment screws equally in the counterclockwise direction in order to increase the engine speed. This will reduce the pilot flow to the spool in the control valve. The horsepower adjustment screws are very sensitive. A 1/4 turn will change the speed by approximately 90 RPM. IQAN can be used in order to monitor the speed of the engine. The spool will shift. The load sensing signal to the pump decreases. The pump will destroke allowing the engine rpm to increase.ReferenceFor more information about the IQAN controller, refer to Systems Operation, RENR8950, "IQAN MDL Control and Monitoring System".Low Pressure Standby
Illustration 4 g01737697
Implement Pump Control (26) Margin pressure adjustment screw. (27) Torque control piston. (28) Load sensing spool. (29) Horsepower adjustment screw. (30) Horsepower control spool. (A) Signal pressure from travel pump. (B) Signal pressure from implement pump. (C) Load sensing pressure from implement control valve. (D) Passage to the actuator piston.Low pressure standby occurs when there is no load sensing signal (C) from the implements to implement pump (6) .When the engine is operating and the joystick is in NEUTRAL, the oil from implement pump (6) flows to the bottom of load sensing spool (28). The oil pressure increases to 2500 kPa (362 psi). Load sensing spool (28) moves upward overcoming the force of the spring. Pump oil flows around load sensing spool (28) through passage (D) to the actuator piston. Since the pump has spacers for minimum displacement, the standby pressure will be at the differential setting of relief of 4000 200 kPa (580 30 psi).The implement pump pressure from load sensing spool (28) forces the actuator piston upward. The implement pump moves to the minimum displacement. The implement pump delivers enough flow in order to
Illustration 3 g01727434
Implement Pump Control (25) Sleeve. (26) Margin pressure adjustment screw. (27) Torque control piston. (28) Load sensing spool. (29) Horsepower adjustment screw. (30) Horsepower control spool. (A) Signal pressure from travel pump. (B) Signal pressure from implement pump. (C) Load sensing pressure from implement control valve. (D) Passage to the actuator piston.Illustration 3 shows the major components of the implement pump control. The pump control group of the travel pump contains the same components.Note: Power shift pressure is not used on either pump control group.Torque control piston (27) is a summing valve which combines the forces from signal pressure (A) and signal pressure (B) from the pumps.Load sensing spool (28) controls the margin pressure. The margin pressure is the difference between the pump system pressure and the work port pressure of the implements. The margin pressure adjustment screw can increase the margin pressure. The margin pressure adjustment screw can decrease the margin pressure.Horsepower control spool (30) directs signal pressure to the actuator piston or from the actuator piston. The signal pressure on the actuator piston controls the flow rate from the pumps.Note: The horsepower adjustment screws regulate the hydraulic horsepower output from the pumps.When the engine drops below 1850 rpm due to the pump load, turn both horsepower adjustment screws equally in the counterclockwise direction in order to increase the engine speed. This will reduce the pilot flow to the spool in the control valve. The horsepower adjustment screws are very sensitive. A 1/4 turn will change the speed by approximately 90 RPM. IQAN can be used in order to monitor the speed of the engine. The spool will shift. The load sensing signal to the pump decreases. The pump will destroke allowing the engine rpm to increase.ReferenceFor more information about the IQAN controller, refer to Systems Operation, RENR8950, "IQAN MDL Control and Monitoring System".Low Pressure Standby
Illustration 4 g01737697
Implement Pump Control (26) Margin pressure adjustment screw. (27) Torque control piston. (28) Load sensing spool. (29) Horsepower adjustment screw. (30) Horsepower control spool. (A) Signal pressure from travel pump. (B) Signal pressure from implement pump. (C) Load sensing pressure from implement control valve. (D) Passage to the actuator piston.Low pressure standby occurs when there is no load sensing signal (C) from the implements to implement pump (6) .When the engine is operating and the joystick is in NEUTRAL, the oil from implement pump (6) flows to the bottom of load sensing spool (28). The oil pressure increases to 2500 kPa (362 psi). Load sensing spool (28) moves upward overcoming the force of the spring. Pump oil flows around load sensing spool (28) through passage (D) to the actuator piston. Since the pump has spacers for minimum displacement, the standby pressure will be at the differential setting of relief of 4000 200 kPa (580 30 psi).The implement pump pressure from load sensing spool (28) forces the actuator piston upward. The implement pump moves to the minimum displacement. The implement pump delivers enough flow in order to