3054 Engine Caterpillar


Electric Starting Motor

Usage:

554 1AM

12 Volt Starting Motor



Illustration 1g00295928
Starting Motor (Side View)


Illustration 2g00295930
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 3g00731492

Voltage ... 12 VDC

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

069-5466 Relay



Illustration 4g00295932

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)
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