ENGINE AR-COMPLETE 3234963 - Caterpillar

Illustration 1 g01792953
345D Block Diagram of Engine and Pump Control
(1) "Switch Panel."
(2) "Air Cleaner Plugged Switch."
(3) "Hydraulic Oil Filter Plugged Switch."
(4) "ATT Hydraulic Oil Filter Plugged Switch."
(5) "Fuel Filter Plugged Switch."
(6) "No.2 Fuel Filter Plugged Switch."
(7) "Water Separator Level Switch."
(8) "Overload Warning Switch."
(9) "Fine Swing Switch."
(10) "Quick Coupler Switch."
(11) Machine ECM
(12) "Key Switch."
(13) "Bucket Cylinder Stroke Sensor"
(14) "Boom Angle Sensor"
(15) "Stick Angel Sensor"
(16) "Engine Speed Dial."
(17) "One-Touch Low Idle Switch."
(18) "Engine Speed Sensor."
(19) "Pump Pressure Sensor 1."
(20) "Pump Pressure Sensor 2."
(21) "ATCH Boom Cylinder Rod Pressure Sensor"
(22) "Squeeze Pressure Sensor "
(23) "Boom Cylinder Head Pressure Sensor "
(24) "Boom Down Pilot Pressure Sensor "
(25) "Implement Pressure Switch. "
(26) "Travel Pressure Switch. "
(27) "Swing Pilot Pressure Switch"
(28) "Boom Up/Stick In Pilot Pressure Switch "
(29) "Boom Up Prior Pressure Switch "
(30) "Joystick Pressure Switch. ".
(31) "ATT Stem 1 Status Switch."
(32) "ATT Stem 3 Status Switch "
(33) "Monitor. "
(34) "Fuel Level Sensor."
(35) "Hydraulic Oil Temperature Sensor. "
(36) "Alternator. "
(37) "Accugrade Back Up Switch "
(38) "Heavy Lift Solenoid. "
(39) "Reverse Fan Solenoid"
(39b) "Swing Brake Solenoid "
(40) "Travel speed solenoid. "
(41) "Boom Relief Pressure Select solenoid "
(42) "1P/2P Change solenoid 1 and 1P/2P Change solenoid 2"
(43) "2 Pump Flow Combine Solenoid"
(44) "1 Way/2 Way Change solenoid "
(45) "Pump 2 Flow solenoid "
(46) "Hydraulic Lock solenoid "
(47) "Foot Switch".
(48) "ATT Pedal (Left)"
(49) "Switch Grip (Left and Right)"
(50) "Modulation Grip (Left and Right)"
(51) "Fault Alarm"
(52) "Engine Oil Level Switch"
(53) "Engine Coolant Level Switch"
(54) "Hydraulic Oil Level Switch"
(55) "Engine ECM"
(56) "Engine Coolant Level Sensor"
(57) "Engine Oil Pressure Sensor."
(58) "User shutdown switch."
(59) "Variable Relief 1 PRV"
(60) "Variable Relief 2 PRV"
(61) "Boom Down Regen PRV "
(62) "Reverse Fan Solenoid"
(63) "Flow Limit Pressure PRV. "
(64) "Stick Out Avoid PRV"
(65) "Stem 1 Retract PRV "
(66) "Stem 1 Extend PRV "
(67) "Stem 3 Retract PRV"
(68) "Stem 3 Extend PRV"
(69) "Variable Fan Motor PRV."
(70) "Power Shift PRV"
(71) "Boom Up Limit PRV"
(72) "Boom Down Limit PRV"
(73) "Bucket In Limit PRV"
(74) "Bucket Out Limit PRV"
(75) "Stick Out Limit PRV"
(76) "Stick In Limit PRV"
(77) "Negative Flow Control PRV" The Machine Electronic Control System provides electronic control of the hydraulic system. The system includes the following components: various inputs (switches and sensors), an electronic control module and various outputs (solenoid valves). The electronic control module (ECM) controls the engine and flow of the hydraulic pump. The ECM also controls the following functions:
Engine Speed
Engine Fan Reverse
Track travel motors
Travel alarm
Swing Brake
Heavy Lift
Attachment Actuators
Implement pump power shift pressure
Hydraulic Flow LimitThe Machine ECM receives signals from the various input devices that are shown on illustration 1. The decisions made by the ECM are based on this information. The ECM acts on these decisions by actuating proportional solenoids, ON/OFF solenoids, and relays.