BARREL GP-PUMP 3829233 - Caterpillar

Schematic of The Main Hydraulic System
Illustration 1 g02709859
(1) Bucket cylinder
(2) Boom cylinder
(3) Travel motor (Right)
(4) Travel motor (Left)
(5) Stick cylinder
(6) Swing boom cylinder
(7) Auxiliary lines
(8) Swing motor
(9) Blade cylinder
(10) Swivel
(11) Main control valve
(12) Pilot pump
(13) Secondary pump
(14) Main pump
(15) Pilot control valve (Boom and Bucket)
(16) Pilot control valve (Right travel)
(17) Pilot control valve (Left travel)
(18) Pilot control valve (Swing and Stick)
(19) Solenoid selector valve (Swing boom / Auxiliary)
(20) Pilot control valve (Swing boom / Auxiliary)
(21) Oil cooler
(22) Oil filter
(23) Pilot manifold
(24) Hydraulic tank Components
Illustration 2 g02709876
Pump compartment
(12) Pilot pump
(13) Secondary pump
(14) Main pump Pump Flow and Pressure Control System
The machine is driven and controlled by the following pump systems:
The main hydraulic pump provides oil to the boom cylinder, the stick cylinder, the bucket cylinder, and the swing boom cylinder. The main hydraulic system also provides oil to the travel motors. In some conditions, the auxiliary circuit is supplied oil from the main pump.
The secondary hydraulic pump provides oil to the blade cylinder and the swing motor. In some conditions, the auxiliary circuit is supplied oil from the secondary pump. This pump also supplements the main hydraulic pump during multiple implement operations.
The pilot hydraulic system provides oil to the control circuit.Main pump (14) is directly connected to the engine through a coupling. The pump is a variable displacement piston pump. The main pump is constructed as a single body, but the pump functions as a two-output pump.The pistons of main pump (14) are arranged in a common cylinder barrel. The main pump output is divided equally by separate ports in the pump housing. Half of the output oil flows to the right side of the main control valve. Half of the output oil flows to the left side of the main control valve.When an operation is being performed, the main control valve directs pump oil from the pumps to the respective cylinders (boom, stick, bucket, swing boom and blade) and / or motors (swing and travel). The main control valve contains numerous valve stems, passages, check valves, relief valves and orifices in order to carry out a single operation or a combined operation. The maximum working pressure of the main hydraulic system is limited by the main relief valve.Reference: For more information on the main control valve, see Systems Operation, "Main Control Valve".The output flow of the main pump is maximized at no load. As the load pressure increases during working conditions, the delivery pressure increases while the flow rate decreases. The maximum hydraulic horsepower remains constant even though the delivery pressure and the flow rates change. The hydraulic horsepower is identical to the engine horsepower.When there is no load on the machine, pump oil flows through the main control valve to the hydraulic tank. When a load is applied to the machine, pump oil is divided at the main control valve. The oil is sent to the travel motor, the swing motor, and the cylinders.Reference: For more information on the main pump, see Systems Operation, "Main Hydraulic Pump".Secondary pump (13)