VALVE AS 7C7838 - Caterpillar

Illustration 1 g02712902
Hydraulic schematic for implement system (1) Tilt cylinder (2) Relief valve (line) (3) Lift cylinders (4) Ride control accumulator (5) Ride control valve (6) Relief valve (line) (7) Solenoid valve (hydraulic lockout) (8) Manual valve (dead engine lower) (9) Main control valve (10) Solenoid valve (pilot proportioning) (11) Pilot oil accumulator (12) Pressure reducing valve (13) Relief valve (load sensing signal) (14) Implement pump (15) Hydraulic tank (A) Implement ECM (B) Power Train ECM (C) Tilt lever position sensor (D) Lift lever position sensor (E) Auxiliary lever position sensor (F) Switch (hydraulic lockout) (G) Kickout set switch (H) Autodig trigger switch (optional) (J) Dig mode switch (optional) (K) Operation mode switch (Autodig System) (L) Autodig kickout set switch (M) Position sensor (lift) (N) Position sensor (tilt) (P) Position sensor (auxiliary) (R) Pressure sensor (lift)Note: Illustration 1 shows a machine with an auxiliary function. Machines without an auxiliary function will not have auxiliary section on main control valve (9). Machines without ride control will not have ride control valve (5) .The electrohydraulic system is composed of the following systems:
Implement electronic control system
Pilot hydraulic system
Main hydraulic system
Ride control system
Kickout systemHydraulic tank (15) is common to all of the systems.The implement electronic control system is made up of the following components:
(7) solenoid valve (hydraulic lockout)
(10) solenoid valves (pilot proportioning)
(14) implement piston pump
(A) implement ECM
(C-E) control levers or joystick control
(F-L) switches
(M-R) sensorsReferenceFor additional information about the implement electronic control system, refer to the Service Manual module Systems Operation, "Implement Electronic Control System" for the machine that is being serviced.The pilot hydraulic system is made up of the following components:
(7) Solenoid valve (hydraulic lockout)
(10) Solenoid valve (pilot proportioning)
(11) Pilot oil accumulator
(12) Pressure reducing valve
(F) Switch (hydraulic lockout)The main hydraulic system is made up of the following components:
(9) main control valve
(1) tilt cylinder
(3) lift cylinders
(13) load sensing signal relief valve
(14) implement piston pumpReferenceFor additional information about the main control valve, refer to the Service Manual module Systems Operation, "Main Control Valve" for the machine that is being serviced.The ride control system is made up of the following components:
(3) lift cylinders
(5) ride control valve
(8) ride control accumulator
(B) power train ECMReferenceFor additional information about the ride control system, refer to the Service Manual module Systems Operation, "Ride Control System" for the machine that is being serviced.The kickout system is made up of the following components:
(12) pressure reducing valve
(A) implement ECM
(C, D) control levers or joystick control
(M) lift linkage position sensor
(N) tilt linkage position sensor
Illustration 2 g02712903
Right side view of machine (1) Tilt cylinder (3) Lift cylinders (4) Ride control accumulator (8) Manual valve (dead engine lower) (9) Main control valve (14) Implement pump (15) Hydraulic tank (A) Implement ECM (B) Power Train ECM (C) Tilt lever position sensor (D) Lift lever position sensor (E) Auxiliary lever position sensor (F) Switch (hydraulic lockout) (G) Kickout set switch (H) Autodig trigger switch (optional) (J) Dig mode switch (optional) (K) Operation mode switch (Autodig System) (L) Autodig kickout set switch (M) Position sensor (lift) (N) Position sensor (tilt)Implement piston