RING-BACKUP 1494076 - Caterpillar

Hydraulic Schematic
Illustration 1 g02730678
Schematic of the Implement Hydraulic System (1) Main control valve (Dozer control) (2) Pilot manifold (3) Relief poppet valve (4) Solenoid valve (Pilot manifold) (5) Pressure tap (Relief of lift circuit) (6) Pressure tap (Relief of tilt circuit) (7) Pressure tap (Fan pump discharge) (8) Dual tilt control valve (9) Dual tilt solenoid valve (10) Left tilt cylinder (11) Right tilt cylinder (12) Left lift cylinder (13) Right lift cylinder (14) Makeup valve (15) Fan motor (16) Solenoid valve(Hydraulic fan) (17) Pressure sensor (Discharge from the pump) (18) High-pressure screen (if equipped) (19) Oil cooler bypass valve (20) High-pressure screen (if equipped) (21) Shuttle valve (22) High-pressure screen (if equipped) (23) Pressure sensor (Discharge for implement pump) (24) Implement pump (25) Oil cooler (26) Pressure switch (Fan pump and motor return filter bypass) (27) Oil filter (Fan pump and motor oil return) (28) Breaker relief valve (29) Oil filter (Implement pump case drain) (30) Pressure switch (Implement pump case drain filter bypass) (31) Check valve (Air purge implement) (32) Manual valve (Lowering lift arm) (33) Check valve (Tilt) (34) Relief poppet valve (35) Check valve (Lift) (36) Shuttle valve (37) Relief valve (Implement pilot oil pressure) (38) Ripper control valve (39) Fan pump (40) Ripper cylinders (41) High-level sensor (42) Fluid sampling valve (43) Temperature sensor (Implement oil) (44) Hydraulic oil tank (45) Low-level sensor (46) Pressure switch (Fan pump and motor case drain filter bypass) (47) Oil filter (Fan pump and motor case drain) (48) Air purge valve (Fan pump case drain) (49) Fan pump (50) Pressure tap (Signal pressure of fan pump) (55) Pilot oil accumulator (56) Pressure reducing valve (57) Solenoid valve (Pilot accumulator) (58) Pressure sensorHydraulic System
Illustration 2 g02727918
Front of machineThe main hydraulic system contains two gear pumps. The large pump (1) provides oil flow to the lift spool and the small pump (2) provides oil flow to the tilt spool.When an implement is activated, oil from the dozer control valve (3) is directed to the lift cylinders (4) and/or tilt cylinders (5).
Illustration 3 g02729443
Illustration 3shows the lift pump (1), the tilt pump (2), and the case drain oil filters.The implement pumps case drain oil filter (3) and the fan pump/fan motor case drain oil filter (4) are located on the right side of the rear frame by the implement pumps. The case drain oil filters remove contaminants from the case drain oil before the oil enters the implement hydraulic tank. The case drain oil filters each contain a bypass switch (5) that alerts the Implement ECM if a filter is restricted.
Illustration 4 g02710040
Main control valve (left) (3) Main control valve
Illustration 5 g02727921
When the implement joystick is moved in the fore/aft direction, oil from the implement control valve is directed to the lift cylinders (3). When the implement joystick is moved in the left right direction, oil from the main control valve is directed to tilt cylinders (1) .