Table 5-1. Troubleshooting
TEST OR INSPECTION
Inspect the bearing to be sure it moves smoothly and quietly; check for evidence of excessive wear.
If the bearing is loose, noisy or worn, replace it. Refer to paragraph 8-1 or 8-2. If the
bearing is not defective, go on to step 2.
Inspect the coupling for cracks, breaks, and distortion. Check the fan for wear, binding, cracks,
breaks and distortion. Check fan for looseness.
If inspection indicates damage, replace fan and/or coupling. Refer to paragraph 8-1 or 8-
Inspect fan and coupling for cracks, breaks, distortion, looseness and binding.
Tighten loose fan. If inspection indicates damage, replace the fan coupling, Refer to
paragraph 8-1 or 8-2. If fan and coupling is not damaged, go on to step 2.
Inspect generator rotor and stator components as follows:
Inspect the rotor shaft at each end for evidence of nicks, rust or wear. Inspect the
rotor assembly to be sure all windings are properly pressed into the core slots.
Inspect the core for wear and replace a badly scored or defective rotor assembly.
Inspect the field windings and leads for damaged or broken wires. Inspect the main
frame for damage and broken welds and for nicks and burrs around the mounting
Test generator rotor and stator components for Model MEP-023A as follows:
Stator, refer to paragraph 8-2b. (1).
Rotor, refer to paragraph 8-2b. (2).
Exciter Field Windings, refer to paragraph 8-2b. (3).
Test generator rotor and stator components for Model MEP 018 as follows:
Rotor, refer to paragraph 8-1f. (2).
Stators. refer to paragraph 8-1 f. (3).
If test and inspection indicate damage, replace stator and rotor. Refer to
paragraph 8-1 or 8-2.
Change 8 5-2