3054 Engine Caterpillar

12 Volt Starting Motor

Illustration 1	g00295928
Starting Motor (Side View)

Illustration 2	g00295930
End view of the starting motor which shows the electrical connections

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 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)

Tension of the spring for the motor brush ... 8.34 to 11.00 N (1.9 to 2.5 lb)

Minimum resistance of the starter cable at 200 °C (392 °F) and at 12 volts ... 0.0017 ohms

Start Relays

9G-4368 Relay

Illustration 3	g00731492

Voltage ... 12 VDC

Resistance between "W1" terminal and "W2" terminal ... 15 ± 1.5 ohms

069-5466 Relay

Illustration 4	g00295932

Voltage ... 6 VDC

Resistance between terminal "A" and terminal "B" ... 30 to 34 ohms

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 volts

Minimum pull-in voltage ... 18 volts

Brush 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)