3406B DIESEL TRUCK ENGINE Caterpillar


Alternators And Regulators

Usage:

Delco-Remy (20SI)

5N5692 24V 45A

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) ... 45A

(1) Torque for the ground terminal nut ... 2.3 ± 0.6 N·m (21 ± 5 lb in)

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

(3) Torque for the output terminal nut ... 7.1 ± 0.9 N·m (64 ± 8 lb in)

3T6353 Regulator (Inside Alternator)

Voltage setting ... No adjustment

Permissible voltage range ... 26 to 30V

Delco-Remy (27SI)

9L5938 12V 65A

Rotation ... Either Direction

Polarity ... negative ground

Rated output (cold):

2000 rpm ... 46A

5000 rpm ... 58A

Rated output (hot) ... 65A

Output voltage ... 14.0 ± .5V

Field current at 12V and 27°C (80°F) ... 5.2 to 5.8A

(1) Torque for pulley nut ... 100 ± 7 N·m (75 ± 5 lb ft)

(2) Terminal torques:

Torque for battery connection nut ... 3.7 ± 0.8 N·m (32.5 ± 7.5 lb in)

Torque for ground connection nut ... 9.0 ± 3.0 N·m (80 ± 27 lb in)

3T7070 12V 65A

Rotation ... Either Direction

Polarity ... negative ground

Rated output (cold):

2000 rpm ... 52A

5000 rpm ... 72A

Rated output (hot) ... 80A

Output voltage ... 14.0 ± .5V

Field current at 12V and 27°C (80°F) ... 5.2 to 5.8A

(1) Torque for pulley nut ... 100 ± 7 N·m (75 ± 5 lb ft)

(2) Terminal torques:

Torque for battery connection nut ... 3.7 ± 0.8 N·m (32.5 ± 7.5 lb in)

Torque for ground connection nut ... 9.0 ± 3.0 N·m (80 ± 27 lb in)

9L6774 Regulator (Inside Alternator)

Voltage rating ... 12V

Voltage setting ... No Adjustment

Voltage range ... 14.0 ± .5V

Delco-Remy (30SI)

4N3986 24V 60A

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 ... 7.1 ± 0.9 N·m (64 ± 8 lb in)

3T6354 Regulator (Inside Alternator)

Voltage setting range ... 26 to 30V

Rated voltage ... 28V

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

Lo ... Low

2 ... Medium Low

3 ... Medium High

Hi ... High

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