TM5-6115-593-34NAVFAC P-8-631-34TO-35C2-3-463-2(d)Remove exciter rotor (38).(e)Remove screws (82) and washers (83) to freebearing cap (84)(f)Attach crane or hoist to endbell (85). Removescrews (80) and washers (81). Remove endbell(85) and PMG stator and exciter stator as a unit.NOTETap lightly with rubber or fiber mallet toloosen endbell. Check for shims in theendbell bearing housing (well). Make certainshims, when incorporated, are reinstalledwhen unit is assembled .(g) Remove nut (86) and lockwasher (87).(h) Use a puller to remove the bearing form the shaft.(See figure 11-15.) protect the shaft end with acap. If bearing is to be used again, make surepuller applies pressure only against the bearinginner ring.(i)Install pipes over generator shaft on the driveand exciter end of rotor. Attach slings and hoistto pipes and remove rotor assembly (89) fromstator and frame (93). Make certain air gap ismaintained between the rotor and stator duringremoval of the rotor.CAUTIONMakecertainpipesareofsufficientstrength to support weight of rotorand that pipes do not have roughedges which would damage shaftsurface.(a) Install pipes over generator shaft on the drive andexciter end of rotor. Attach slings and hoist topipes and remove rotor assembly (89) from statorand frame (93). Make certain air gap ismaintained between the rotor and stator duringremoval of the rotor.NOTEInstall bearing as described in paragraph11-9 and PMG and exciter as described inparagraphs 11-6 and 11-7. Make certaingenerator armature (stator) and the exciterarmature is aligned with the exciter field.(b) Install generator as described in paragraph 11-5.11-13. EXCITER STATOR. The brushless exciterprovides excitation current for the generator. The stator isthe stationary field for the exciter assembly.a.Inspect.Inspect the exciter stator as follows:(1)Inspect for loose, frayed, or burnedwindings.(2) Inspect frame for cracks and burred matingsurfaces.b.Test.Disconnect all leads on the stator tocompletely isolate the winding.(1)Using a Wheatstone bridge connected to afield winding, resistance shall be between10.57 and 10.79 ohms at an ambienttemperature of 77°F (25°C).(2)Check insulation resistance with amegohmmeter between winding and frame.Resistance of each winding shall be at least1 megohm at 77°F (25°C). If this value isnot met, clean or dry out winding, andrepeat test. Replace if defective.11-31
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