TM 9-6115-604-34NAVFAC P-8633-345-20. LOAD CIRCUIT BREAKER CB1D1 SERVICE.Ensure that the generator set is shutdown and the unit fullydeenergized, load cables are in the park position and surge protectors are grounded. Remove load circuit breakerCB101 in accordance with paragraph 2-17. Use a dean dry both to remove dirt and moisture that may have collected onthe vacuum interrupters and all insulating parts. Ensure that all electrical connections are tight and dean. Lubricate theload circuit breaker in accordance with Table 5-1. It should be noted that all bearings used in load circuit breaker aresealed and do not require lubrication. Table 5-1 provides the location of all lubrication points, the type of lubricationrequired, and the two methods of lubrication. Method I is the periodic lubrication required after 2000 operations (Figure5-12) or 1 year. Method 11 is the lubrication procedure to be used whenever the load circuit breaker is disassembled forrepair. Severe operating conditions, such as use in extremely hot, cold, or dusty environments, may warrant morefrequent lubrication intervals. Load circuit breaker CB101 must be manually operated several times after lubrication andobserved for proper operation. Manually operate the load circuit breaker as follows: a. Move the manual charge armassembly (Figure 5-12) up and down using the handle end of the racking crank until the drive springs are fully charged.b.The drive springs are fully charged when the CHARGE-DISCHARGE indicator reads CHARGED, and the manualcharge arm assembly can no longer be raised.WARNINGTo avoid Injury to personnel, always remove the load circuit breaker from Its cubide anddischarge or block the return and drive springs.WARNINGDischarge to ground the primary disconnects and vacuum Interrupter mid-band rings beforehanding to prevent Injury to personnel as a result of electrocution.5-21. LOAD CIRCUIT BREAKER CB101 ADJUSTMENT.During periodic inspections and when the load circuitbreaker is replaced or repaired, the following adjustments must be checked. To perform these adjustments, first removethe breaker from its cubide in accordance with paragraph 2-17, then remove the front cover (1, Figure 5-19) by removingbolts (2), and lockwashers (3) and washers (4).WARNINGWhenever an adjustment is to be checked or performed with the drive springs In the chargedposition, It Is mandatory to block the drive springs by placing the blocking pins In the holes atthe upper end of the drive spring center shafts (the blocking pins are located In the tool box).a.Trip Open Eccentric Adjustment. With the breaker in the OPEN position and the drive springs charged, the verticalfree movement in the opening solenoid plunger (C, Figure 5-18) should be 1/8 ±1/16 inch (3.2 ±1.6 mm). Loosen thelocking bolt and rotate the eccentric to move the trip open arm until the correct distance is obtained.b.Toggle Bearing Clearance Adjustment With the breaker in the OPEN position and the drive springs charged, theclearance between the toggle bearing (Figure 5-18) and the trip opening cam should be 1/32 +1/32-0 inch (0.8 +0.8/-0mm). If adjustment is necessary, the toggle subassembly retainer nut should be adjusted clockwise to increaseclearance; counter-clockwise to decrease clearance.c.Charging Motor Limit Switch Adjustment. The charging motor limit switch is actuated by the charging motor limitswitch cam (Figure 5-16). The charging motor limit switch serves to energize the charging motor (Figure 5-15) during adrive spring charging operation and deenergize the charging motor when the drive springs reach the fully chargedposition. The charging motor limit switch is properly adjusted it its contacts are open when the drive springs are in thefully charged position and closed when the drive springs are discharged. The position of the charging motor limit switchcontacts can be determined by using an ohmmeter to test for continuity. If adjustment is necessary, loosen the twoscrews (136, Figure 5-19) which hold the charging motor limit switch in place and move the switch up or down asrequired. Tighten the two screws (136) after completing the adjustment.5-44
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business