ARMY TM 9-6115-639-13
AIR FORCE TO 35C2-3-386-51
MARINE CORPS TM 10155A-13/1
4-28. AC CIRCUIT INTERRUPTER CONTACTOR MAINTENANCE
This task covers removal, inspection, and installation.
Tool Kit, General Mechanics Automotive
Generator set shut down (Para. 2-9)
(Item 2, App. B, Sect. III)
Battery cables disconnected
Cable disconnected for SLAVE RECEPTACLE
There are two different contactor (4, Figure 4-19) configurations for the 3kW
generator sets. Where noted, follow the procedures below for the configuration
shown in Figure 4-19 which matches the generator set on which you are
performing maintenance. If you are replacing the contactor, the Configuration B
contactor must be installed.
Unlock main access cover latches and lift cover to open.
Configuration A: Remove protective plate (1, Figure 4-19) from bracket (9) by removing screws (2) and
Configuration B: Remove protective plate (1, Figure 4-19) by removing screws (2) and lockwashers (3).
Tag and disconnect electrical wiring from AC circuit interrupter contactor K1 (4).
Configuration A: Remove contactor K1 (4) and bracket (9) from back of control box by removing screw
and captive washer assemblies (5) and washers (6).
Configuration B: Remove contactor K1 (4) from back of control box by removing screw and captive
washer assemblies (5) and washers (6).
Configuration A: Remove microswitch (8) from contactor K1 (4) by removing screw and captive washer
Inspect contactor for corrosion, evidence of electrical short, and obvious damage.
Inspect electrical wiring for cuts, crimps, bare wire, or other damage. Ensure connectors are securely
Remove and replace any component that is damaged to the extent that it will effect the safe operation of
the generator set.