(l) Check the drive pulley nut for corrode(c, damaged or stripped threads. Replace if necessary.
(a) Inspect the generator frame and pole pieces for breaks, cracks, and damage. Replace all defective
parts. Replace field insulation if broken, torn, or dirty. Replace the insulating bushings if they are
broken, corroded, or oil soaked.
(b) Inspect the field windings for worn, cracked, peeling, and frayed insulation. Replace the coils if
necessary. Inspect all leads and terminals for breaks and corrosion. Replace all defective parts.
(c) Use a test lamp to check the field windings for grounds. Touch one probe to the field terminal lead and
the other probe to an unpainted surface on the generator frame (fig. 111). If the lamp lights, a ground is
1 Field lead
Figure 111. Testing field windings for grounds.