Lincoln Electric SVM153-A service manual Test Procedure

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F-30	F-30
	TROUBLESHOOTING & REPAIR

ROTOR RESISTANCE TEST (CONTINUED)

FIGURE F.10 – ROTOR BRUSH LEADS

SLIP

RINGS

BRUSH

HOLDER

ASSEMBLY

ACCESS PANEL

TEST PROCEDURE

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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.

COMMANDER 500