Troubleshooting & repair, Rotor resistance test (continued) – Lincoln Electric COMMANDER SVM153-A User Manual
Page 83
TROUBLESHOOTING & REPAIR
F-30
F-30
COMMANDER 500
SLIP
RINGS
BRUSH
HOLDER
ASSEMBLY
ACCESS PANEL
FIGURE F.10 – ROTOR BRUSH LEADS
ROTOR RESISTANCE TEST (CONTINUED)
TEST PROCEDURE
1. Conduct this test with the engine off.
2. Using the 3/8" wrench, remove the right front
case side.
3. Using the 3/8" wrench, remove the brush
holder access panel. See Figure F.10.
4. Using the 3/8" wrench, remove the brush
holder assembly. See Figure F.10.
5. Using the ohmmeter, check the rotor winding
resistance across the slip rings. Normal
resistance is approximately 27.0 ohms.
6. 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.
7. If the test does not meet the resistance
specifications, then the rotor may be faulty.
Replace.
8. Position the brush holder assembly and
attach it with two screws previously
removed. Make certain the brushes are
centered and seated properly on the slip
rings. Adjust if necessary.
9. Replace the brush holder access panel.
10. Replace the right front case cover.