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VOLTAGE REGULATOR TEST
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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REASSEMBLY - TM-5-4210-230-14P-1_447
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL significantly from these figures.  Before condemning a rotor for an open coil, check the solder joints at the slip   ring   leads,   as   a   poor   connection   at   either   of these leads will test the same as an open coil.  If the proper   resistance   is   not   obtained   after   resoldering these connections, discard the rotor. STATOR TEST Due   to   the   extremely   low   resistance   of   the   stator windings   it   is   difficult   to   measure   their   resistance   with   a conventional ohmmeter.  The stator should therefore be tested for grounds and continuity between phases with a test light.  A 12 volt test light is preferred. Do not attempt to check stators in this manner while they are still connected to the heat sinks.  Remove the stator from the alternator before testing (see Fig.  22 for stator test). Discard    any    stators    which    appear    overheated    and    have charred insulation, regardless of how they test. Several  stators  are  available  which  can  be  used  as service replacements on these alternators.  The part numbers of these stators will be listed in the appropriate parts list. SLIP RING REPLACEMENT The slip ring assembly used in these alternators is of extremely     sturdy     construction     and     will     seldom     require replacement.    If  it  should  become  damaged  in  some  way, such as dropping the rotor, it may be replaced in the following manner. 1.    Unsolder  the  slip  ring  leads  and  lift  them  clear  of  the eyelets which serve to retain them to the rotor coil leads. Do not lose or damage the eyelets (see Fig.  23). 2.  With a suitable puller, the slip ring assembly may now be pulled from the shaft (see Fig. 24). 3.  Clean the rotor shaft and apply a small amount of Loctite to  the  shaft  on  the  section  normally  occupied  by  the  slip ring assembly. 4.  Position the new slip ring assembly on the shaft so that the two leads are aligned with the two rotor coil eyelets on the rotor,  and  carefully  press  the  slip  ring  assembly  onto  the shaft. FIG.  22 CTS-2743T  Page 10

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