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TROUBLESHOOTING & REPAIR
ROTOR RESISTANCE TEST (continued)
FIGURE F.7 – ROTOR BRUSH LEADS
SLIP RINGS
BRUSHES
LEADS 200A 200
| LEADS |
| 201 |
+ | 5H |
|
-
TEST PROCEDURE
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1.Turn the engine off.
2.Perform the Case Cover Removal proce- dure.
3.Locate and label the four leads from the rotor brush holder assembly. See Figure F.7. Using the needle nose pliers, remove the leads. See Figure F.7. This will electrically isolate the rotor windings.
4.Using the ohmmeter, check the rotor winding resistance across the slip rings. See Figure F.7. Normal resistance is approximately 4.7 ohms.
5.Measure the resistance to ground. Place one meter probe on either of the slip rings. Place the other probe on any good unpaint- ed ground. The resistance should be very high, at least 500,000 ohms.
6.If the test does not meet the resistance spec- ifications, then the rotor may be faulty. Replace.
7.Connect the leads previously removed from the brush assembly. Make sure the leads are connected to the proper brushes. See the Wiring Diagram.
8.If finished testing, perform the Case Cover Replacement procedure.
