5-12 CONTACTOR MAINTENANCE.
This task covers:
Tool Kit, General Mechanic's
(item 1, Appendix B)
Both generator sets shut down; paragraph 2-5.3.3.
Trailer handbrakes set, front support leg/landing low
ered, and rear leveling-support jack lowered;
paragraph 2-3.2.1. Switch box cover open.
1. Remove four screws (1, Figure 5-9), lock washers (2) and terminal shields (3) from contactor (9).
2. Remove nuts (4), lock washers (5), and flat washers (6) from all contactor terminals (8).
Leads W3, W4, and W5 (11, 10, and 13) must be removed along with leads W7,
and W8 when contactor K1 is being removed.
3. Tag and remove power cable leads (7) from contactor terminals A2, B2 (8), and ends of leads W7, and W8
(11, and 13) from contactor terminals A1, B1.
4. Tag and disconnect terminal lugs of W9 wires from contactor (9) terminals (12) X, Y, 11, 12, 21, 22, 32,
5. Remove four nuts (15), lock washers (16), flat washers (17), and contactor stud (18).
1. Check for continuity between contactor terminals X and Y. If no continuity, replace contactor.
Dangerous voltage exists on live circuits. Always observe precautions and never
work alone. Failure to observe this warning could result in severe personal injury
2. Attach 115 VAC power source across pins X and Y of contactor and check continuity of relay contacts
before and after contactor is energized as listed in Table 5-3.