TM5-6115-585-34 NAVFACP-8-623-34 TO-35C2-455-2 TM-05684C/05685B-34 (3) Testing Field Coils. See Operator and Organizational  Maintenance  Manual. (4) Testing Brushes. See Operator and Organizational  Maintenance  Manual. (5) Testing Brush Springs. Style I Starter. (see  figure  5-9). Measure brush spring with tension meter. Push the brush and take reading just as the brush projects a little from the brush holder. On a new brush, the spring tension should be 32 to 40 ounces. If brush spring tension is below 20 ounces, replace it. Figure 5-9.    Testing  Brush  Spring  Tension STYLE I Starter Only. (6) Testing Brush Springs. Style II Starter. Firmly hold brush holder and push the brush against  the  brush  spring  until  completely  inside of its guide. If little or no resistance (tension) is present, spring should be replaced. Badly worn or pitted brush surface may indicate weak  spring. (7) Testing Solenoid  Switch. Style I Starter. (see figure 5-10). (a) Check to be sure plunger moves freely in coil. Measure pull-in coil current using a ammeter. See Test A, figure 5-10, Current should not exceed 16 amps. (b) Measure the hold-in current using Test B, figure 5-10. Current should not exceed amps. (c) Check total hold and pull current draw using Test C, figure 5-10. Total current 6 should not exceed 25 amps. Replace defective sole- noid   switch. (8) Testing Solenoid Switch. Style II Starter. (see  figure  5-10). (a) With solenoid on starter, push the solenoid plunger in and release it. The plunger should return to its original position. Plunger should slide in and out freely when push by hand. (b) Check for continuity between terminal “B" and terminal “M” with an ohmmeter. There should be no continuity. (c) Push the plunger in and hold while checking  continuity  between  termiml  “B”  and  “M”. The ohmmeter should read zero ohm with complete continuity.  If  no  continuity  reading,  the  solenoid is defective, replace it. g. Repair (1) Repairing Starter. Repair starter by replacing  defective  components.  Repair  procedures for individual components are as follows: (2) Repairing Armature. If the  commutator wear or runout is not excessive, (max 0.004), it may be resurfaced as follows: (a) Resurfacing Commutator. Place the armature in a lathe. Style I starters may be turn down with a cutting tool. Style II starters my  Not  be  turn  down  with  a  cutting  tool!  Only 00 or 000 sandpaper may be used on Style II and if wear or runout cannot be corrected, the Style II armture must be replaced! The Style I commutator turn down may not reduce the diameter of commutator below 1-1/16 inches. (b) Undercutting Mica. After cummutator is resurfaced, undercut mica to a depth of 0.025 to 0.032 inch using a power driven undercutting tool. If no power driven tool is available, the mica  may  be  under  cut  by  hand.  See  figure 5-11. NOTE Use  care  in  undercutting.Do  not  widen commutator slots by removing metal from bars, and do not leave a thin edge of mica next to bars. Figure 5-11 illustrates good and bad exa of undercutting. After mica has been undercut, polish commutator in a lathe with number 00 to 000 sandpaper while the armature is rotating. Remove all copper  sand  and  mica  with  compressed  air. Change     8 5-7