C12 Marine Engines Caterpillar


Electric Starting Motor

Usage:

C-12 9HP


Illustration 1g01431943


Illustration 2g01431945

When the electric starting motor is viewed from the drive end, the motor rotates in the following direction. ... Clockwise

No load conditions at 25 °C (77 °F)

Speed ... 7643 ± 1683 rpm
Current draw ... 76.5 ± 14.5 amp
Voltage ... 23 V

(1) Battery terminal

A maximum of three cable or wire terminals should be between the nuts.

Tighten the nut on the battery terminal to the following torque. ... 30.5 ± 3.5 N·m (22 ± 3 lb ft)

(2) Ground terminal

Tighten the nut on the ground terminal to the following torque. ... 30.5 ± 3.5 N·m (22 ± 3 lb ft)

(3) Ground terminal

Tighten the nut on the ground terminal to the following torque. ... 2.25 ± 0.25 N·m (20 ± 2 lb in)

(4) Switch terminal

The wire terminal that is on the switch terminal must be insulated with heat shrink tubing. Do not use molded terminals.

Tighten the nut on the switch terminal to the following torque. ... 2.25 ± 0.25 N·m (20 ± 2 lb in)

(5) Motor terminal

Tighten the nut on the motor terminal to the following torque. ... 30.5 ± 3.5 N·m (22 ± 3 lb ft)

(6) Motor frame terminal

Tighten the nut on the motor frame terminal to the following torque. ... 8 ± 3 N·m (72 ± 24 lb in)

Clearance between the pinion and the housing ... 9.1 mm (.36 inch)

Solenoid

Current draw at 20 V and 25 °C (77 °F)

Pull-in windings ... 57 ± 4.5 Amp
Hold-in windings ... 16 Amp maximum

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