R1600G Load Haul Dump Machine Electrical System Engine Start Caterpillar


Engine Start
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Illustration 1g01413726

Engine start circuit

The components of the engine start circuit are the key start switch, the Power Train Electronic Control Module (Power Train ECM), the Engine Electronic Control Module (Engine ECM), the start relay magnetic switch, the main relay magnetic switch, the electric starting motor solenoid, the electric starting motor, and the transmission control (STIC steering).




Illustration 2g01021953

Dash panel

(1) Key start switch

(2) OFF position

(3) ON position

(4) START position




Illustration 3g01021954

Cab

(5) Power Train ECM




Illustration 4g01021955

Left side view of engine

(6) Engine ECM

With the battery disconnect switch in the ON position, 24 volt power is supplied from the batteries via #11 to the Engine ECM and to the key start switch. With the key start switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker #9 to the Power Train ECM and via circuit breaker #5 to the Engine ECM.




Illustration 5g01021957

Left side view of engine

(7) Start relay magnetic switch




Illustration 6g01021958

Cab (below rear arm rest)

(8) Main relay magnetic switch




Illustration 7g01021959

Left side view of engine

(9) Electric starting motor solenoid

(10) Electric starting motor




Illustration 8g01021960

Cab

(11) Transmission control (STIC steering)

(12) Transmission direction control switch

When key start switch (1) is in ON position (3), main relay magnetic switch (8) will energize, 24 volt power will be supplied to the switched circuit breakers. With the main magnetic relay switch energized, 24 volt power will be supplied via circuit breaker #9 to the Power Train ECM and via circuit breaker #11 to the Engine ECM.

When the key start switch is in the START position (4), Power Train ECM (5) supplies 24 volt power to start relay magnetic switch (7). Power then returns to the Power Train ECM to ground. The Power Train ECM will energize the main relay magnetic switch when transmission direction control switch (12) is in the NEUTRAL position. When the start relay magnetic switch is energized, 24 volt power is supplied to electric starting motor solenoid (9) and to electric starting motor (10). The electric starting motor will begin to crank.

ReferenceFor more information on the key start switch in the OFF position, refer to Systems Operation, Testing and Adjusting, "Engine Stop" for the machine that is being serviced.

Information System:

R1600G Load Haul Dump Machine Electrical System Engine Start (Remote Control)
R1600G Load Haul Dump Machine Electrical System Autoshift Control (STIC Steering)
R1600G Load Haul Dump Machine Electrical System Heating and Air Conditioning
R1600G Load Haul Dump Machine Electrical System Main Power Relay
CB34, CB34XW and CC34 Utility Compactors Belts - Inspect/Adjust/Replace
R1600G Load Haul Dump Machine Systems Ejector Bucket - Disassemble
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Relief Valve (Main, Axle Propel Pump) - Test and Adjust
140M and 150 Motor Grader Steering Control Valve - Remove
140M and 150 Motor Grader Blade Lift Arm - Install
140M and 150 Motor Grader Blade Lift Arm - Remove
PL61 Pipelayer Safety Messages - PL61 Pipelayer
785D OEM Off-Highway Truck Battery Disconnect Switch
R1600G Load Haul Dump Machine Electrical System Engine Stop
R1600G Load Haul Dump Machine Electrical System Actual Gear Indicator
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Pressure Override Valve (Drum Propel Pump) - Test and Adjust
140M and 150 Motor Graders Engine Supplement Radiator Guard and Support, Aftercooler, Hydraulic Oil Cooler, and Radiator, - Install
140M and 150 Motor Grader Steering Control Valve - Install
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Pressure Override Valve (Axle Propel Pump) - Test and Adjust
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Piston Pump Neutral (Drum Propel Pump) - Adjust
140M and 150 Motor Grader Control Manifold (Steering Backup) - Remove
140M and 150 Motor Grader Control Manifold (Steering Backup) - Install
CB22, CB24, CB32 and CC24 Utility Compactors Safety Messages
CB22, CB24, CB32 and CC24 Utility Compactors Sound Information and Vibration Information
CB22, CB24, CB32 and CC24 Utility Compactors Specifications