3054 Engine Caterpillar

Illustration 1	g00292776
Typical alternator (side view)

Illustration 2	g00292777
End view of the 12 volt alternator which shows the electrical connections

Illustration 3	g00503643
End view of the 24 volt alternator which shows the electrical connections

Note: Test the battery with a carbon pile 4C-4911 Battery Load Tester in order to measure the maximum output from the alternator.

The rotation of the alternator is clockwise when the alternator is viewed from the pulley.

The regulator of the alternator is sealed.

Polarity ... Negative ground to the case

Type of brushes ... Sealed

(1) Tighten the pulley nut to the following torque. ... 45 to 55 N·m (33 to 40 lb ft)

(2) Tighten the terminal nut "W" to the following torque. ... 2 to 2.5 N·m (17 to 22 lb in)

The "W" terminal is the source of the alternating current from the stator.

Note: The peak voltage at the "W" terminal must not be less than the output voltage at the "B+" terminal. The peak voltage at the "W" must not be more than two volts greater than the "B+" terminal.

(3) Tighten terminal nut "D+" to the following torque. ... 1.45 to 1.95 N·m (13 to 17 lb in)

The "D+" terminal is the field excitation terminal. The battery must be connected in order to energize the circuit.

(4) Tighten terminal nut "B+" to the following torque. ... 5.9 to 9.8 N·m (52 to 87 lb in)

(5) Tighten terminal nut "B−" on the 24 volt alternator to the following torque: ... 3.6 ± 0.8 N·m (32 ± 7 lb in)

12 Volt Alternator at 25°C (77°F)

Rpm ... 1500 to 8000 rpm

Positive terminal load ... 2 amperes to maximum output

Minimum full load current at 5000 rpm ... 48.6 amperes

Minimum full load current at 1500 rpm ... 20.7 amperes

Output voltage ... 14 ± .5 volts

Rated voltage ... 12 volts

Maximum leakage current with load of 18000 ohm ... 220 microamperes

Load range ... 0 to 1 ampere

24 Volt Alternator at 25°C (77°F)

Rpm ... 1500 to 8000 rpm

Positive terminal load ... 2 amperes to maximum output

Minimum full load current at 5000 rpm ... 47 amperes

Minimum full load current at 1500 rpm ... 13.5 amperes

Output voltage ... 28 ± 1 volts

Maximum leakage current with load of 18000 ohm ... 220 microamperes

Load range ... 0 to 1 ampere

Alignment of the alternator pulley to the crankshaft pulley ... ± 2.4 mm (0.095 inch)