WRENCH-TORQUE 5691697 - Caterpillar

Table 1
Pilot line Control Valve Machine Operation
(55) Bucket control valve BUCKET CLOSE
(56) Attachment control valve WORK TOOL (if equipped)
(57) Stick II control valve STICK OUT
(58) Boom II control valve BOOM RAISE
(59) Boom I control valve BOOM RAISE
(60) Right travel control valve FOWARD RIGHT TRAVEL
(61) Left travel control valve FOWARD LEFT TRAVEL
(62) Stick regeneration control valve STICK IN
(63) Swing control valve SWING RIGHT
(64) Stick I control valve STICK OUT Pilot oil from the pilot control valves flows through pilot lines to the ports on the bottom of the main control valve in order to perform the opposite operation.The following example is given for the BOOM LOWER operation and the BOOM RAISE operation. Machine operations for a stick operation, bucket operation, travel operation, and swing operation are accomplished in the same manner as the boom operation.When the joystick for the boom is moved to the BOOM RAISE position, pilot oil from pilot control valve (27) flows through pilot line (28) to boom I control valve (10) and boom II control valve (22). The pilot pressure shifts the boom I control valve and the boom II control valve. The oil delivery from the drive pump flows to the head end of the boom cylinders in order to perform the BOOM RAISE operation.When the joystick for the boom is moved to the BOOM LOWER position, pilot oil from pilot control valve (27) flows through pilot line (31) to boom I control valve (10). The pilot pressure shifts the boom I control valve. The BOOM LOWER operation is now performed.For more information concerning the operation of the boom, refer to Systems Operation, "Boom System".Pressure Switch Circuits
When the travel controls are in the NEUTRAL position, the pilot pressure in passage (14) remains low and travel pressure switch (7) is OFF. The machine ECM recognizes the OFF condition of all of the pressure switches. The AEC system is activated in order to lower the engine rpm. If either travel control is moved from the NEUTRAL position, the pilot oil pressure in passage (14) increases and travel pressure switch (7) is ON. The machine ECM activates the AEC system in order to increase the engine rpm.When the implement controls are in the NEUTRAL position, the pilot pressure in passage (13) remains low and implement pressure switch (6) is OFF. The machine ECM recognizes the OFF condition of all of the pressure switches. The AEC system is activated in order to lower the engine rpm. If any of the implement controls are moved from the NEUTRAL position, the pilot oil pressure in passage (13) increases and implement pressure switch (6) is ON. The machine ECM activates the AEC system in order to increase the engine rpm.Pressure Sensors
Pressure sensor (26) is connected to pilot oil for boom down control. This pressure sensor sends an electrical signal to the machine ECM.When a boom DOWN function is performed, pressure sensor (26) sends an electrical signal to the machine ECM. The machine ECM uses the pressure sensor information and then sends