TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 (4) Rotor.  Perform a growler test on the rotor as follows: (a) Place the rotor on the growler and energize. (b) Hold a thin piece of metal, such as a hack-saw blade, directly over the top slot of the rotor and along the length of the slot.  If the coil is shorted the blade will vibrate rapidly and cause a growling noise. (c) If the above test is not met, proceed with the repair procedures. (5) PM Generator Exciter Field.  Perform the following resistance checks: (a) At lead separation box, disconnect and tag PM generator exciter field leads (there are three; the common; the 50 Hertz tap; and the 60 Hertz tap). (b) Using a double Kelvin bridge, check the resistance between the common lead and the 50 Hertz tap.  Resistance should be 1.1 ohms ±10 percent. (c) Using a double Kelvin bridge, check the resistance between the common lead and the 60 Hertz tap.  Resistance should be 1.35 ohms ±10 percent. (6) PM Generator Permanent Magnet.  The strength of the magnet field surrounding the permanent magnet (rotor), because of its in accessibility, may not be checked directly.  However, if the AC output of the PM generator is within ±10 percent of 135V AC at 1800 rpm, the permanent magnet may be considered normal.  If the PM generator output is out of tolerance and checking the resistance of   the   PM   exciter   field   (as   indicated   in   the previous   subparagraph   5)   produces   positive results, the permanent magnet, by the process of elimination, may be considered defective.  If defective, refer to paragraph 11-6 for replacement procedures for permanent magnet rotor assembly. b. Replacement. (1) Removal.  The following steps are for the removal     of     the     generator     from     the generator set frame. (a) If  generator  set  is  equipped  with  a housing kit remove panels (34 and 30, figure 15-21) and strip (27). (b) The  permanent  magnet  assembly must be removed prior to removing generator   from   generator   set,   as follows (see figure 11-3): (1) Remove   screws   (16   and   28),   washers (29),   and   nuts   (27)   and   remove   cover (30). (2) Remove  screws  (31)  and  washers  (32) and   remove   permanent   magnet   stator (33). WARNING USE EXTREME CARE WHEN REMOVING ROTOR TO PREVENT INJURY TO HANDS DUE TO MAGNETIC ATTRACTION BETWEEN THE PERMANENT MAGNET GENERATOR ROTOR AND THE PERMANENT MAGNET GENERATOR STATOR OR GENERATOR SHAFT. (3) Remove    bolt    (34),    washers    (35)    and spring pin (36) and remove magnet rotor (37). 11-10