3054 and 3056 Industrial and Generator Set Engines 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 volts

Tension 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 ohms

Pull in current at 25 °C (77 °F) ... 60 amperes at 12 volts

Hold 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 volts

Minimum pull-in voltage ... 18 volts

Maximum resistance of the starter cable at 200 °C (392 °F) and at 24 volts ... 0.0034 ohms

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)

(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 ohms

Note: 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