3208 INDUSTRIAL & MARINE ENGINES Caterpillar


Electric Starter Motor

Usage:

8C3643 (12V), 8C3648 (12V), 6V3969 (12V), 104-5724 (12V)

Rotation as viewed from drive end ... Clockwise

No load conditions at 25°C (77°F):

Speed ... 6900 ± 1800 rpm

Current draw ... 127.5 ± 27.5A

Voltage ... 11V

(1) Torque for large terminal nuts ... 31 ± 4 N·m (23 ± 3 lb ft)

(2) Torque for small terminal nuts ... 2.25 ± 0.25 N·m (20 ± 2 lb in)

(3) Torque for motor frame terminal ... 8 ± 3 N·m (70 ± 26 lb in)

Solenoid

Current consumption (draw) at 25°C (77°F):

Pull in windings at 10V ... 92.5 ± 7.5A

Hold in windings at 10V ... 23A

8C3647 (24V), 8C3651 (24V), 8C4090 (24V), 9G4339 (24V), 6V4458 (24V), 6V5537 (24V)

Rotation as viewed from drive end ... Clockwise

No load conditions at 25°C (77°F):

Speed ... 7643 ± 1683 rpm

Current draw ... 67.5 ± 7.5A

Voltage ... 23V

(1) Torque for large terminal nuts ... 31 ± 4 N·m (23 ± 3 lb ft)

(2) Torque for small terminal nuts ... 2.25 ± 0.25 N·m (20 ± 2 lb in)

(3) Torque for motor frame terminal ... 8 ± 3 N·m (70 ± 26 lb in)

Solenoid

Current consumption (draw) at 25°C (77°F):

Pull in windings at 20V ... 56.5 ± 4.5A

Hold in windings at 20V ... 14.6A

7T2265 (12V), 6V3954 (12V)

Rotation as viewed from drive end ... Clockwise

No load conditions at 25°C (77°F):

Speed ... 5500 rpm max

Current draw ... 200A max

Voltage ... 12V

(1) Torque for large terminal nuts ... 31 ± 4 N·m (23 ± 3 lb ft)

(2) Torque for small terminal nuts ... 2.25 ± 0.25 N·m (20 ± 2 lb in)

Solenoid

Current consumption (draw) at 25°C (77°F):

Pull in windings at 12V ... 92A

Hold in windings at 12V ... 16A

3T6305 (24V), 7T0798 (24V), 6V4454 (24V), 106-8552 (24V)

Rotation as viewed from drive end ... Clockwise

No load conditions at 25°C (77°F):

Speed ... 5500 rpm min

Current draw ... 140A max

Voltage ... 24V

(1) Torque for large terminal nuts ... 31 ± 4 N·m (23 ± 3 lb ft)

(2) Torque for small terminal nuts ... 2.25 ± 0.25 N·m (20 ± 2 lb in)

Solenoid

Current consumption (draw) at 25°C (77°F):

Pull in windings at 24V ... 51A

Hold in windings at 24V ... 7A

6V5538 (24V)

Rotation as seen from drive end ... Clockwise

No load conditions:

Speed (rpm) ... 3300 Minimum

Current (amps) ... 80 Maximum

Voltage ... 23.5V

(1) Battery terminal. Three cables or wire terminal maximum between nuts. Two cable terminals maximum with 0 AWG or larger. Tighten nut to a torque of ... 30.5 ± 3.5 N·m (270 ± 31 lb in)

(2) Nut. Tighten nut to a torque of ... 1.5 ± 0.5 N·m (13 ± 4 lb in)

(3) Ground terminal. Tighten nut to a torque of ... 31 ± 4 N·m (23 ± 3 lb ft)

(4) Switch terminal. Tighten nut to a torque of ... 2.25 ± 0.25 N·m (20 ± 2 lb ft)

(5) Motor terminal. Tighten nut to a torque of ... 31 ± 4 N·m (23 ± 3 lb ft)

(6) Motor frame terminal. Tighten nut to a torque of ... 18 ± 3 N·m (13 ± 2 lb ft)

Solenoid

Current consumption (draw) at 25°C (77°F):

Pull in windings at 24V ... 103A

Hold in windings at 24V ... 19A

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