TRACK GP 2893063 - Caterpillar

Illustration 5 g06135530
(7) Main control valve
(21) Slow return check valve
(22) Bypass check valve
(23) Oil cooler
(35) Negative Flow Control Valve
(36) Solenoid valve
(41) Pilot oil manifold
(42) Travel speed solenoid valve
(43) Swing brake solenoid valve
(44) Valve
(45) Solenoid valve (hydraulic lockout)
(63) Control valve
(64) Gear pump
(70) Pilot operated check valve
(71) Quick couplerTilt Cab Schematic
Illustration 6 g06121727
(7) Main control valve
(21) Slow return check valve
(22) Bypass check valve
(23) Oil cooler
(25) Shutoff valve for cab lowering
(35) Negative Flow Control Valve
(36) Solenoid valve
(41) Pilot oil manifold
(42) Travel speed solenoid valve
(43) Swing brake solenoid valve
(44) Valve
(45) Solenoid valve (hydraulic lockout)
(48) Pilot relief valve
(49) Pilot filter
(50) Hydraulic tank
(51) Return filter
(52) Pilot pump
(53) Idler pump
(54) Drive pump
(55) Proportional reducing valve (power shift pressure)
(58) Relief valve for medium pressure circuit
(59) Tilt cab cylinder
(60) Control valve for tilt cab cylinder
(61) Control valve
(62) Tilt cab control valve
(63) Control valve
(64) Gear pumpHydraulic Schematic for HVG
Illustration 7 g06121763
(40) Swivel
(65) Pump group
(66) Track cylinder
(67) Pressure reducing valve
(68) Manual valve for trackHydraulic Pump Flow and Pressure Control System
Illustration 8 g03105336
Pump compartment
(19) Drive pump
(22) Idler pump
(23) Pilot pump
(41) Delivery line (drive pump)
(42) 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 control valve, the joysticks, the travel pedals, the swing brake, and the travel motors.
The electronic control system controls the outputs of the engine and pumps.The main hydraulic system delivers oil flow from idler pump (22) and drive pump (19) to control the following components: bucket cylinder (4), stick cylinder (3), boom cylinders (5), right travel motor (8), left travel motor (7) and swing motor (6).
Illustration 9 g06120548
Main control valve
(13) Main relief valve
(29) Main control valve bodyDrive pump (19) and idler pump (22) are electronically controlled variable displacement piston pumps. The performance of both pumps is equal.Drive pump (19) is directly connected to the engine by a flexible coupling. Idler pump (22) is mechanically connected to the drive pump through gears. The drive pump and the idler pump deliver oil to main control valve body (13). The drive pump delivers oil to the left travel control valve, the boom I control valve, the bucket control valve, and the stick II control valve. The idler pump delivers oil to the right travel control valve, the boom II control valve, the swing control valve, and the stick I control valve. Pilot pump (23) is a gear pump that supplies oil to the pilot hydraulic system. Pilot pump (23) is mechanically connected to idler pump (22) through gears. All engine output is used to drive these three 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 identical to the engine horsepower.When no work is being performed, pump oil flows through main control valve (13) and into hydraulic tank (40). The main control valve generates a negative flow control (NFC)