HOSE AS 3555223 - Caterpillar

Makeup Operation
If the ripper is in a position above the ground, pressure in the rod end of the lift cylinders exceeds the pressure in the head end of the lift cylinders until the ripper comes in contact with the ground. This occurs because the weight of the ripper causes the ripper to drop very quickly. If the pump is not able to supply enough oil, cavitation in the head end of the ripper lift cylinders can occur.In this situation, the pressure in the passage to head end (47) becomes less than the tank pressure in return passage (68) . When the pressure in return passage (68) is enough to overcome the force of the spring behind left makeup valve (71) , the valve shifts to the left.The difference in pressure causes tank oil to be drawn past makeup valve (71) into the passage to head end (47) . This makeup oil supplements the pump supply oil and the cylinders do not cavitate.When the ripper comes in contact with the ground, the ripper stops falling and the implement pump can now supply enough flow. The pressure rises in the passage to head end (47) . When the pressure in the passage to head end (47) is high enough, the force of the spring behind makeup valve (71) forces the valve to shift back to the right.Ripper Tip Control Valve
SHANK IN Condition
Hydraulic Schematic of the Implement Hydraulic System in the SHANK IN Condition
The following callouts are for the foldout: (1) Inlet Manifold (2) Blade Lift Control Valve (3) Blade Tilt Control Valve (4) Ripper Lift Control Valve (5) Ripper Tip Control Valve (13) Pilot Filter (14) Implement Lockout Valve (15) Accumulator (16) Pressure Reducing Valve (17) Implement Pump Pressure Sensor (18) Ripper Lift Cylinders (19) Ripper Tip Cylinders (20) Float Boost Signal (21) Quick-Drop Valve (22) Blade Lift Cylinders (23) Dual Tilt Valve (24) Blade Tilt Cylinders (25) Steering Motor (26) Steering Pump (27) Steering Pump Control Valve (28) Fan Pump Pressure Sensor (29) Charge Pump (30) Pump Control Valve (31) Fan Drive Pump (32) Fan Drive Motor (33) Hydraulic Oil Cooler (34) Cold Oil Relief Valve (35) Cooler Bypass Valve (36) Implement Pump (37) Hydraulic Oil Tank (38) Case Drain Filters (39) Temperature Sensor (40) Vacuum Breaker (72) End Cover (73) External Resolver (AA) Mechanical Connection (EE) Pneumatic Pressure (FF) Activated Component (GG) Tank Pressure (JJ) High Pressure (KK) First Pressure Reduction (LL) Second Pressure Reduction (PP) Charge Pressure or Pilot Pressure (QQ) First Charge Pressure Reduction or First Pilot Pressure Reduction (SS) Trapped Oil
Illustration 18 g01106003
Cutaway of the Ripper Tip Control Valve in the SHANK IN Condition
Illustration 19 g01061414
Ripper Tip Control Valve (SHANK IN) (20) Float Boost Signal (42) Passage from Implement Pump (43) Passage to External Resolver (44) Flow Control Valve Spool (46) Solenoid (47) Passage to Head End (48) Passage to Rod End (49) Passage from Pilot Manifold (50c) Tip Valve Spool (51) Solenoid (53c) Passage from End Cover (54) Passage to Hydraulic Oil Tank (55) Load Check