Figure 5-9. Testing Brush Spring Tension STYLE I Starter Only

TM5-6115-584-34 NAVFAC P-8-622-34 TO-35C2-456-2 (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. (b) Measure the hold-in current using Test B, figure 5-10. Current should not exceed 6 amps. (c) Check total hold and pull current draw using Test C, figure 5-10. Total current 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 terminal “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 & resurfaced as follows: (a) Resurfacing Commutator. Place the armature in a lathe. Style I starters my be turn down with a cutting tool. Style II starters may 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 belcw 1-1/16 inches. (b) Undercutting Mica. After commutator is resurfaced, undercut mica to a depth of 0.025 to 0.032 inch usina a power driven undercutting (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 5-1O, current should not exceed 16 amps. 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 examples of undercutting. After mica has been undercut, polish commutator in a lathe with number 00 to 000 sandpaper while the annature is rotating. Remove all copper, sand and mica with compressed air. Change 7 5-7