GEAR AS-PUMP 8N1350 - Caterpillar

Swing Motor with Fine Swing (If Equipped)
Illustration 2 g03537797
(1) Swing motor
(14) Main control valve
(31) Gear pump (fan motor)
(33) Pilot pump
(34) Drive pump
(35) Idler pump
(41) Hydraulic tank
(57) Fine swing solenoid valve Heavy Lift (if equipped)
Illustration 3 g03537799
Heavy lift (partial schematic)
(14) Main control valve
(18) Main relief valve
(24) Pilot oil manifold
(33) Pilot pump
(43) Pilot relief valve
(58) Heavy lift solenoid valve Hydraulic Pump Flow and Pressure Control System
Illustration 4 g01330660
Pump compartment
(34) Drive pump
(35) Idler pump
(37) Proportional reducing valve (power shift pressure)
(46) Delivery line (drive pump)
(47) Delivery line (idler pump) This machine is driven and controlled by the following systems.
The main hydraulic system controls the cylinders, the travel motors, and the swing motor.
The pilot hydraulic system supplies oil to the main pumps, the main control valve, the swing brake, and the travel motors.
The electronic control system controls the outputs of the engine and pump.
The hydraulic oil cooling system provides oil to the fan motor in order to cool the hydraulic oil.The main hydraulic system delivers oil flow from idler pump (35) and drive pump (34) in order to control the following components: bucket cylinder (4), stick cylinder (5), boom cylinders (8), right travel motor (3), left travel motor (2) and swing motor (1).
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Main control valve
(18) Main relief valve
(48) Right control valve body
(49) Left control valve body Idler pump (35) and drive pump (34) are variable displacement piston pumps. The performance of both pumps is equal.Drive pump (34) is directly connected to the engine by a flexible coupling. The drive pump delivers oil to the right control valve body (48) of the main control valve. Idler pump (35) is mechanically connected to the drive pump through gears. The idler pump delivers oil to the left control valve body (49) of the main control valve. Pilot pump (33) is a gear pump that supplies oil to the pilot hydraulic system. Pilot pump (33) is mechanically connected to idler pump (35) through gears. Gear pump (31) supplies oil to the oil cooling system. Gear pump (31) is mechanically connected to the engine through gears. All engine output is used to drive these four pumps.As the load pressure increases during working conditions, the main pumps increase the delivery pressure and the pumps decrease the flow rate. The hydraulic horsepower remains constant even though the delivery pressure and the flow rates change. The hydraulic horsepower is approximately identical to the engine horsepower.When no work is being performed, pump oil flows through main control valve (14) and into hydraulic tank (41). The main control valve sends a negative flow control signal to each main pump regulator to destroke the pump to the minimum output flow.If an operation is being performed, main control valve (14) directs pump oil to the respective cylinders (boom, bucket and stick) and/or motors (swing and travel). Main control valve (14) contains numerous valve stems, passages, check valves, and orifices in order to carry out a single operation or a combined operation. The working pressure of the main hydraulic system is regulated by main relief valve (18).
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Cab
(50)