G379, G398 & G399 ENGINES Caterpillar

4N3986 24V 60A (Delco-Remy Number 1117734)

NOTE: Load the battery with a carbon pile (6V4930 Battery Load Tester) to get the maximum alternator output.

Polarity ... Negative Ground

Rotation ... Either Direction

Speed for testing (rpm) ... 6500

Output voltage ... 27.5 ± 1.0V

Output (cold) ... 60A

(1) Torque for the pulley nut ... 102 ± 7 N·m (76 ± 5 lb ft)

(2) Torque for the output terminal nut ... 6.8 to 8.0 N·m (60 to 72 lb in)

3T6354 Regulator (Delco-Remy Number 1116405) Inside Alternator

Voltage setting ... No Adjustment

Permissible voltage range ... 26 to 30V

4N3987 32V 60A (Delco-Remy Number 1117733)

NOTE: Load the battery with a carbon pile (6V4930 Battery Load Tester) to get the maximum alternator output.

Polarity ... Negative Ground

Rotation ... Either Direction

Speed for testing (rpm) ... 6500

Output voltage ... 36.6 ± 1.3V

Output (cold) ... 60A

(1) Torque for the pulley nut ... 102 ± 7 N·m (76 ± 5 lb ft)

(2) Torque for the output terminal nut ... 6.8 to 8.0 N·m (60 to 72 lb in)

7T5665 Regulator (Delco-Remy Number 1987518) Inside Alternator

Voltage setting range ... 33 to 39V

Rated voltage ... 37.5V

(A) Adjust the voltage with the four-position cap.

Lo ... Low

2 ... Medium Low

3 ... Medium High

Hi ... High

High position is for 16 cell battery system (32V). For 15 cell battery system, pull out the four position cap and change to position 3 for 30V.

5L1243 32V 60A (Delco-Remy Number 1117074)

Polarity ... Negative Ground.

Rotation is clockwise when seen from drive end.

Output at 1800 rpm and 37.5V (cold) ... ^*20 A

Output at 2500 rpm and 37.5V (cold) ... ^*51 A

Rated output (hot) ... 60 A

Field current at 32V and 80°F (27°C) ... 2 to 2.7 A

(1) Torque for nut ... 70 to 80 N·m (50 to 60 lb ft)

(2) Tension of brush spring ... 2.8 N (10 oz.)