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F-40

TROUBLESHOOTING & REPAIR

F-40

 

ROTOR RESISTANCE AND GROUND TEST (STATIC) (CONTINUED)

FIGURE F.9 - ROTOR BRUSH LEADS

SLIP RINGS

BRUSHES

 

#200A

#200B

+

#201 -

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TEST PROCEDURE

1.Turn the engine off.

2.Perform the Case Cover Removal procedure.

3.Locate and label the leads from the rotor brush holder assembly. See Figure F.9. Using the needle nose pliers, remove the leads. This will electrically isolate the rotor windings.

4.Using the ohmmeter, check the rotor winding resistance across the slip rings. See Figure F.9. Normal resistance is approximately 25 ohm, at 77º F. (25º C.).

5.Measure the resistance to ground. Place one meter probe on either of the slip rings. Place the other probe on any good unpainted chassis ground. The resistance should be very high, at least 500,000 (500k) ohms.

6.If the test does not meet the resistance speci- fications, then the rotor may be faulty and should be replaced.

7.If this test meets the resistance specifications, continue testing using the dynamic rotor resis- tance and ground test.

VANTAGE® 400

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Lincoln Electric 400 service manual Slip Rings Brushes

400 specifications

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