3126B and 3126E Truck Engines Caterpillar


Electric Starting Motor

Usage:

3126B 7AS



Illustration 1g01569121



Illustration 2g01156917

Typical solenoid connections

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 ... 3638 ± 413 rpm
Current ... 90 ± 16 Amp
Voltage ... 23 VDC

(A) Clearance between the pinion and the housing ... 1.02 ± 0.76 mm (0.040 ± 0.030 inch)

Note: A maximum of three cable terminals or wire terminals may be used with the battery terminal nut (1) . A maximum of two of the cable terminals may be equal to or greater than 0 AWG.

(1) Final installation torque for the battery terminal nut ... 30.5 ± 3.5 N·m (270 ± 30 lb in)

(2) Final installation torque for the ground terminal nuts ... 30.5 ± 3.5 N·m (270 ± 30 lb in)

(3) Final installation torque for the nut ... 2.25 ± 0.25 N·m (20 ± 2 lb in)

Note: The switch terminal must be insulated with heat shrink tubing. Do not use molded terminals.

(4) Final installation torque for the switch terminal nut ... 2.25 ± 0.25 N·m (20 ± 2 lb in)

Note: The internal Torx screw must be held during tightening or loosening of the motor terminal nut (5) .

(5) Final installation torque for the motor terminal nut ... 14.7 ± 3.4 N·m (130 ± 30 lb in)

(6) Final installation torque for the bolt for the motor frame terminal ... 8 ± 3 N·m (70 ± 27 lb in)

Solenoid assembly

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

Pull-in windings ... 36 Amp
Hold-in windings ... 6 Amp
Maximum rated current ... 750 Amp

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