SPRING 7J6539 - Caterpillar

Starting Motor
Illustration 1 g00379835
Starting motor and starting motor solenoid
No load conditions at 25°C (77°F) Rpm with no load ... 4000 to 6000 rpmMaximum current ... 540 amperesCurrent draw with no load ... 130 amperesVoltage ... 11.5 voltsRated voltage ... 12 voltsPower rating ... 2.0 kilowattsPower rating C0.5 and C0.7 Standard ... 0.8 kilowattsOption ... 1.2 kilowattsC1.1 Standard ... 1.4 kilowattsOption ... 1.1 kilowattsC1.6 Standard ... 1.4 kilowattsC1.5 and C2.2 ... 2.0 kilowattsMinimum average cranking rpm ... 130Starting motor solenoid Pull-in current ... 54.5 amperesHold-in current ... 10.5 amperes (1) Tighten the battery terminal nut to the following torque. ... 15 N m (11 lb ft) (2) Tighten the two mounting bolts to the following torque. ... 50 6 N m (37 4 lb ft) (3) Tighten the nut for the switch terminal to the following torque. ... 1.0 to 1.3 N m (9 to 12 lb in)Maximum resistance of the starter cable at 20°C (68°F) and at 12 volts ... 0.04 ohmsStart Relays
Illustration 2 g00381753
Schematic of the relays
(4) When the ignition switch is in the OFF position or the RUN position, the relay switch is closed across the contact "30" and the contact "87a". (5) When the ignition switch is in the START position, the relay switch is closed across the contact "30" and the contact "87". Then, the starting motor is engaged. Maximum voltage drop in closed position ... 0.150 to 0.250 volts (6) Connector pins on the start relay Resistance between contact "85" and contact "86" ... 7.2 0.7 ohms