4.31 OVERLOAD RELAYS (K7 & K8) REPLACEMENT.
THIS TASK COVERS:
General Mechanics Tool Kit
Marker Tags (qty 7)
a. Removal. See figure 4-30.
Rotating parts and lethal voltage levels are used in operating the FDECU. Be sure
power source is disconnected. Injury or death can occur if connected to power
(1) Shutdown the FDECU per paragraph 2.4 and disconnect main power cable from power source.
(2) Loosen eight captive screws (1) and carefully pull the electrical assembly (2) out.
(3) Turn to release three latches (3) and open power box assembly cover (4).
Both overload relays are installed the same. The following procedures apply to
either overload relay. The quantities given are for one only.
(4) Tag and disconnect seven wire leads (5) from overload relay (6).
(5) Loosen three terminal screws (7) then pivot overload relay (6) down to release contacts and remove.
(1) Install overload relay (6) by engaging bottom clip at an angle and pivoting into position.
tightening three terminal screws (7).
(2) Place the reset control (8) to the M position.
(3) If replacing overload relay (K7), place the amperage dial (9) to 1.8. If replacing overload relay (K8), place
the amperage dial to 8.
(4) Connect seven wire leads (5) to overload relay (6) per tags and wiring diagram figure 4-14. Remove tags.
(5) Close power box assembly cover (4) and turn three latches (3) to secure.
(6) Carefully slide electrical assembly (2) into frame. Be sure no cables or wires are pinched. Secure with
eight captive screws (1).
(7) Connect FDECU main power cable to power source and operate per paragraph 2.4.
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