ROD AS-CONNECTING 2019884 - Caterpillar

Illustration 1 g03724441
Main control valve
(1) Main control valve
(2) Control valve (blade and stabilizer)
Illustration 2 g03877120
Main control valve
(3) Blade/stabilizer raise "B4"
(4) Blade/stabilizer lower "A4" The control valve is part of the main control valve. The control valve includes a housing, a control spool, two pressure balance spools and ball changeover valves.The control valve modulates the flow of oil to the stabilizer cylinders or the blade cylinders. The control valve also sends a load sensing signal to the main pump regulator.Placing the control lever on the left console forward or backward supplies pilot pressure in order to move the control spool of the control valve.The metering throttle that is formed in the control valve establishes the required flow. The load sensing signal allows the pump to upstroke.Main pump pressure goes to the main control valve and through the open solenoid valve for the stabilizer or through the open solenoid valve for the blade to the stabilizer and/or blade cylinders.The oil from the stabilizer cylinder and/or the blade cylinder returns through work ports "B" or "A" to the main control valve. Then, the oil goes through port "T" into the return line to the hydraulic tank.