BUSHING-REDUCING 3B6768 - Caterpillar

Illustration 1 g00295928
Illustration 2 g00295930
12 Volt Starting Motor
Note: The rotation of the starter motor pinion is clockwise when the starter is viewed from the drive end.No load conditions at 25°C (77°F) Rpm of shaft ... 7000 minimum Current draw ... 130 amperes maximum Voltage ... 11.5 volts Rated voltage ... 12 voltsTension of the spring for the motor brush ... 8.34 to 11.00 N (1.9 to 2.5 lb)Maximum resistance of the starter cable at 200 °C (392 °F) and at 12 volts ... 0.0017 ohmsPull in current at 25 °C (77 °F) ... 60 amperes at 12 voltsHold in current at 25 °C (77 °F) ... 12 amperes at 12 volts (1) Tighten the battery terminal nut to the following torque. ... 24 to 32 N m (18 to 24 lb ft) (2) Tighten the nut for the switch terminal to the following torque. ... 1.0 to 1.3 N m (9 to 12 lb in)24 Volt Starting Motor
No load conditions at 25°C (77°F) Rpm of shaft ... 7000 minimum Current draw ... 85 amperes maximum Voltage ... 23 volts Rated voltage ... 24 voltsMinimum pull-in voltage ... 18 voltsMaximum resistance of the starter cable at 200 °C (392 °F) and at 24 volts ... 0.0034 ohmsBrush length Minimum brush length ... 15.5 mm (0.61 inch)Armature end play ... 0.1 to 0.3 mm (0.004 to 0.012 inch)Install shims or remove shims in order to adjust the armature end play to the correct specification.Commutator New diameter ... 45 mm (1.77 inch) Minimum diameter ... 42.5 mm (1.67 inch) (1) Tighten the battery terminal nut to the following torque. ... 24 to 32 N m (18 to 24 lb ft) (2) Tighten the nut for the switch terminal to the following torque. ... 1.0 to 1.3 N m (9 to 12 lb in)Start Relays
9G-4368 Relay
Illustration 3 g00295931
(1) Resistance between "C1" terminal and "C2" terminal with the battery ... 0 ohmsNote: There must be no polarity between the terminal "C1" and terminal "C2" without battery current. (2) Resistance between "W1" terminal and "W2" terminal ... 15 1.5 ohms 069-5466 Relay
Illustration 4 g00295932
(1) Resistance between terminals 4, 7, 6 and 9 ... 9 ohms (2) Resistance between terminal "A" and terminal "B" ... 30 to 34 ohms