2008/04/14 Caterpillar


Correction to Systems Operation Testing and Adjusting , "Engine Start" {1408, 1450}

Usage:

R1300G II RSL
Load Haul Dump:
R1300GSeries II (S/N: RSL1-UP)
Systems Operation Testing and Adjusting, RENR8579, "R1300G Series II Load Haul Dump Machine Electrical System", "Engine Start". This module is part of Service Manual, RENR8531 Volume 2.

The information in this module has changed. Replace the information with the following information.

Engine Start




Illustration 1g01420358

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 starter motor solenoid, the electric starter motor, the STIC steering transmission control, the fire suppression control loop receptacle (foam type), and the fire suppression control loop plug (dry powder type).




Illustration 2g01225702

(1) Key start switch

(2) OFF position

(3) ON position

(4) START position




Illustration 3g01236917

(5) Power Train ECM

(6) Main relay magnetic switch




Illustration 4g01225706

(7) Engine ECM

With the battery disconnect switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker 14 to Power Train ECM (5) and via circuit breaker 6 to Engine ECM (7) and key start switch (1) .

With key start switch (1) in ON position (3), main relay magnetic switch (6) is energized. 24 volt power is supplied from main relay magnetic switch (6) via circuit breaker 6 to Engine ECM (7) and via circuit breaker 14 to Power Train ECM (5).




Illustration 5g01225707

(8) Start relay magnetic switch




Illustration 6g01225708

(9) Electric starter motor solenoid

(10) Electric starter motor




Illustration 7g01225709

(11) Transmission control (STIC steering)

(12) Transmission direction control switch

When key start switch (1) is in START position (4), Power Train ECM (5) supplies 24 volt power to start relay magnetic switch (8). Power then returns to Power Train ECM (5) to ground. Power Train ECM (5) will energize start relay magnetic switch (8) when transmission direction control switch (12) is in the NEUTRAL position. When start relay magnetic switch (8) is energized, 24 volt power is supplied to electric starter motor solenoid (9) and to electric starter motor (10). Electric starter motor (10) will begin to crank.

ReferenceFor information on the key start switch in the OFF position, refer to Systems Operation, Testing and Adjusting, "Engine Stop".

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