PLATE 5110311 - Caterpillar

Illustration 1 g02979217
Backhoe control valve with six valve banks
(1) Inlet Manifold
(2) Stabilizer Control Valve
(4) Stick Control Valve
(5) Bucket Control Valve
(6) Swing Control Valve
(7) Boom Control Valve
(8) Stabilizer Control Valve
(9) Outlet Manifold
(LS) Load sense port
(S) Pump supply port
(T) Tank (Return) port
Illustration 2 g02979218
Backhoe control valve with seven valve banks
(1) Inlet Manifold
(2) Stabilizer Control Valve
(3) Extendable Stick Control Valve
(4) Stick Control Valve
(5) Bucket Control Valve
(6) Swing Control Valve
(7) Boom Control Valve
(8) Stabilizer Control Valve
(9) Outlet Manifold
(LS) Load sense port
(S) Pump supply port
(T) Tank (Return) port
Illustration 3 g02979219
Backhoe control valve with eight valve banks
(1) Inlet Manifold
(2) Stabilizer Control Valve
(3) Extendable Stick Control Valve
(4) Stick Control Valve
(5) Bucket Control Valve
(6) Swing Control Valve
(7) Boom Control Valve
(8) Stabilizer Control Valve
(9) Outlet Manifold
(10) Auxiliary control valve
(LS) Load sense port
(S) Pump supply port
(T) Tank (Return) port The backhoe valve group consists of either six, seven, or eight control valves. All the valves except the stabilizer valves are Proportional Priority Pressure Compensation (PPPC). The machines can be configured with a seventh valve for the E-stick and an eighth valve for the auxiliary function.The pressure compensator in each control circuit creates a load sense (LS) signal pressure. Supply oil in the individual control valve is diverted into a signal line within the control valve. The highest LS signal is sensed at all of the pressure compensators in the backhoe group. This LS pressure is also sensed at the pump control valve.Note: The stabilizer control valves are typically operated independently of all other control circuits. For this reason, there is no need for the stabilizer control valves to be PPPC. The pump control valve will provide pressure compensation for the stabilizer control valves when operating the stabilizers.The ports for the valves face the rear of the machine.The bank valves (backhoe control) are located below the floorplate at the rear of the operator station. The valves are mounted on the rear frame. All the control valves except the e-stick and auxiliary valves are connected to the joysticks with pilot lines. The e-stick and auxiliary are electro-hydraulic controlled. All sections of the control valve are the type that has a closed centered position.