5-13 CONTACTORS K1 AND K2 MAINTENANCE.
This task covers: a. Removal
Tool Kit, General Mechanics
(item 1, appendix B)
Multimeter (item 3, appendix B)
Both generator sets shut down; paragraph
2-5.3.3. Trailer handbrakes set, front support
leg/landing lowered, and rear leveling-support
jack lowered; paragraph 2-3.2.1. Switch box
1. Remove four screws (1, figure 5-18), lock washers (2) and terminal shields (3) from contactor (10).
2. Remove nuts (4), lock washers (5), and flat washers (6) from all contactor terminals (9).
Leads W3, W4, and W5 (13, 14, and 15) must be removed along with leads W6, W7,
and W8 when contactor K1 is being removed.
3. Tag and remove power cable leads (7) from contactor terminals A2, B2, and C2 (8), and ends of leads
W6, W7, and W8 (10, 11, and 12) from contactor terminals A1, B1, and C1 (9).
4. Tag and disconnect terminal lugs of W9 wires from contactor (9) terminals (16) X, Y, 11, 12, 21, 22, 32,
5. Remove four nuts (17), lock washers (18), flat washers (19), and contactor (9).
1. Check for continuity between contactor terminals X and Y. If no continuity, replace contactor.
Dangerous voltage exits on live circuits. Always observe precautions and never work
alone. Failure to observe this warning could result in severe personal injury or
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 5-5.