PIN AS 1155030 - Caterpillar

Illustration 1 g02027755
Hydraulic Schematic
(1) Lift cylinder
(2) Tilt cylinder (834H)
(3) Tilt and tip cylinder (834H)
(4) pilot operated check valve
(5) Rod end line relief valve for the lift cylinder
(6) Rod end line relief valve for the tilt cylinder (834H)
(7) Rod end line relief valve for the tilt/tip cylinder (834H)
(8) Head end line relief valve for the tilt/tip cylinder (834H)
(9) Main control valve
(10) Pilot control actuator for lowering
(11) Pilot control actuator for tilt left
(12) Pilot control actuator for tip forward (834H)
(13) Pilot control actuator for raising
(14) Load check valve
(15) Main relief valve
(16) Pilot control actuator for the tip back position (834H)
(17) Pilot control actuator for tilt right (834H)
(18) Combination valve
(19) Implement pump
(20) Hydraulic oil filter
(21) Pilot relief valve
(22) Hydraulic oil cooler bypass valve
(23) Hydraulic oil cooler
(24) Hydraulic fan motor
(25) Hydraulic fan pump
(26) Pump control valve
(27) Solenoid valve (hydraulic fan)
(28) Hydraulic tank
(29) Pilot/brake pump Pilot Hydraulic SystemThe pilot hydraulic system provides pilot oil to the main control valve in order to actuate the spools of the main control valve.The pilot hydraulic system is made up of the following components: the pilot/brake pump (29), the pilot relief valve (21), the hydraulic oil filter (20), the combination valve for pilot supply (19) and the pilot control actuators (10), (11), (12), (13), (16), and (17).Reference: For additional information on the pilot hydraulic system, refer to Systems Operation, "Pilot Hydraulic System" for the machine that is being serviced.Main Hydraulic SystemThe main hydraulic system supplies hydraulic oil that is used to power the cylinders that move the implements.The main hydraulic system is made up of the following components: main control valve (9), lift cylinder (1), tip cylinder (834H) (2), tilt and tip cylinder (834H) (3), main relief valve (15) and implement pump (19).The main hydraulic system supplies the force that is necessary to move the blade.Reference: For additional information on the main hydraulic system, refer to System Operation, "Main Hydraulic System" for the machine that is being serviced.Hydraulic Fan SystemThe hydraulic fan system cools the oil that is in the hydraulic system.The hydraulic fan system is made up of the following components: hydraulic fan pump (25), pump control valve (26), the hydraulic fan (solenoid valve) (27), hydraulic fan motor (24), hydraulic oil cooler bypass valve (22) and hydraulic oil cooler (23).Reference: For additional information about the hydraulic fan system, refer to Systems Operation, "Hydraulic Fan System" for the machine that is being serviced.Implement Hydraulic System
Illustration 2 g00554597
Right Side View
(1) Pilot/brake pump
(2) Implement pump
(3) Electrohydraulic control
(4) Implement electronic control module (ECM)
(5) Main control valve
(6) Lift cylinder
(7) Hydraulic fan motor
(8) Fan reversing valve ( 836H)
(9) Pump control valve
(10) Hydraulic fan pump
(11) Hydraulic tank
(12) Pilot oil relief valve
(13) Tilt and tip cylinder (834H) The implement hydraulic system is composed of the following systems: the implement electronic control system, the pilot hydraulic system, the main hydraulic system and the hydraulic fan system. Hydraulic tank (11) is common to all of the systems.The basic operation of the hydraulic system works in the following manner.The operator turns the key start switch in order to start