CONTROLLER AS 5397821 - Caterpillar

Illustration 1 g00486669
Ripper Control Valve (Control Valve Spool in HOLD Position) (1) Outlet passage to tank (2) Passage to rod end of ripper lift cylinder or rod end of ripper tip cylinder (3) Outlet passage to tank (4) Passage to head end of ripper lift cylinder or head end of ripper tip cylinder (5) Makeup valve (6) Outlet passage to tank (7) Spring (8) Lever (9) Control valve spool (10) Passage for signal oil to the inlet manifold (11) Passage for signal oil (12) Load check valve (13) Passage (14) Chamber (15) Flow control valve (16) Metering slots (17) Inlet passage for pump oil (18) Orifice (19) Spring (20) Passage (21) Chamber for signal oil (22) Shuttle valve (23) Passage for signal oil to tankThe ripper control valve is the first valve in the implement control valve bank.The ripper control valve is used to raise and the valve is used to lower the ripper. Also, the ripper control valve is used to tip the ripper shank. The function is controlled by the operator through the use of an electric switch. The switch is located in the ripper control lever. The switch shifts a spool in the ripper diverter valve. The diverter valve directs the oil to the correct circuit. System Operation, "Ripper Diverter Valve"The ripper control valve is composed of the following components:control valve spool (9), shuttle valve (22), load check valve (12), flow control valve (15) and makeup valve (5) Control valve spool (9) is a spring centered closed center manually operated spool. The control valve spool (9) has the following three positions:RAISE or TIP OUT, HOLD and LOWER or TIP IN. Spring (7) keeps the spool in the HOLD position when the ripper lift or tip circuits are not active. Movement of the spool is controlled manually by the operator. A linkage connects the ripper lift control lever to lever (8). Lever (8) is connected to control valve spool (9) .Flow control valve (15) limits the maximum flow of oil to the ripper circuit and the valve limits the pressure drop across valve spool (9). This limits the flow forces on the control valve spool which reduces operator lever efforts.Shuttle valve (22) is a double check valve that sends the highest signal oil pressure to the inlet manifold. The inlet manifold sends the signal oil to the compensator valve on the pump. More descriptions of the shuttle valve and the flow control valve are given. Also, descriptions of the control valve spool in different positions are given.Descriptions for load check valve (12), and makeup valve (5) are under separate topics.HOLD position
When the control valve spool and all other implement valve spools are in the HOLD position, the pump oil flows to inlet passage (17), which is common in all the valve sections and the passage has no outlet. Oil then flows around the flow control valve. Also, the oil flows in metering slots (16). Oil flows through metering slots (16) and the oil moves the flow