HDB Series and M1 Series Heavy Duty Brushless Alternators Stator - Test Caterpillar


Stator - Test
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1.1. Stator Winding Continuity Test
2.1. Stator Winding Ground Test

The illustrations below show The M1 series alternator (35 amps).

Stator Winding Continuity Test




    Illustration 1g00825551

    Stator Winding Continuity Test

    (8) Stator

    (9) Stator leads

  1. Remove the rear cover.

  1. Disconnect all stator leads (9) from the rectifier.

  1. Connect the multimeter leads across any pair of stator leads (9) .

  1. Measure the resistance between the stator leads.

    Expected Results:

    6N-9294 Alternator Gp ... 0.2420 ± 0.0180 ohms
    5S-9088 Alternator Gp ... 0.1110 ± 0.0090 ohms OR 0.2220 ± 0.0180 ohms
    100-5047 Alternator Gp ... 0.1110 ± 0.0090 ohms OR 0.2220 ± 0.0180 ohms
    169-3345 Alternator Gp ... 0.1080 ± 0.0060 ohms OR 0.2160 ± 0.0120 ohms
    185-5294 Alternator Gp ... 0.0629 ± 0.0032 ohms OR 0.01258 ± 0.0064 ohms
    177-9953 Alternator Gp ... 0.0381 ± 0.0020 ohms OR 0.0762 ± 0.0040
    197-8820 Alternator Gp ... 0.0267 ± 0.0014 ohms OR 0.0334 ± 0.0028 ohms

    Results:

    OK - The resistance is within tolerance. Repeat steps 1 through 4 for all other possible pairs of stator leads (9). If all of the results are OK, the stator is normal. STOP.

    NOT OK - The resistance is above tolerance. Stator (8) has an open circuit. Replace the stator. STOP.

    NOT OK - The resistance is below tolerance. Stator (8) has a short circuit. Replace the stator. STOP.




Illustration 2g00824809

The 35 amp alternator has three stator leads: (A), (B) and (C). Measure the resistance three times: (AB), (AC) and (BC) .




Illustration 3g00824931

The alternators that are greater than 35 amps have four stator leads: (A), (B), (C) and (D). Measure the resistance six times: (AB), (AC), (AD), (BC), (BD) and (CD) .

Stator Winding Ground Test




    Illustration 4g00825552

    Stator Winding Ground Test

    (7) Rear frame

    (8) Stator

    (9) Stator leads

  1. The rear cover remains removed from the alternator.

  1. Connect the multimeter leads across rear frame (7) and one stator lead (9) .

  1. Measure the resistance.

    Expected Result: The resistance is greater than 100000 ohms.

    Results:

    OK - The resistance is greater than 100000 ohms. Repeat steps 1 to 3 for the other stator leads (9). If all of the results are OK, the stator is normal. STOP.

    NOT OK - The resistance is NOT greater than 100000 ohms. Stator (8) is shorted to the frame. Replace the stator. STOP.

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