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 TM 9-4120-430-14
0033 00
3.
Remove or loosen screw (8) with lockwasher (9) securing strap (10) holding capacitor C4 (11) to capacitor
mounting plate (17).
4.
Remove capacitor C4 (11) by sliding out from strap (10).
Current Sensing Relay
1.
Verify labels on wires to wiring list (WP 0038 00) and disconnect leads.
2.
Remove two screws (12) and lockwashers (13) securing current sensing relay (14) to capacitor mounting plate (17).
3.
Remove current sensing relay (14).
Capacitor Mounting Plate
1.
Remove four screws (15) and lockwashers (16) that secure the capacitor mounting plate (17) to the housing inside
bulkhead.
2.
Remove the capacitor mounting plate (17) from the unit housing.
TEST
Compressor Start Capacitor (C3)
1.
Check for internal condition by placing the test leads of a multimeter on the terminals of the capacitor.
2.
Multimeter needle should move rapidly toward top of the scale; then, slowly return toward zero if the capacitor is
good.
3.
If needle moves to top of scale and remains there, the capacitor is internally short-circuited; if the needle does not
move, the capacitor contains an open circuit.
4.
Replace capacitor with short/open circuits.
Compressor Run Capacitor (C4)
1.
Check for internal condition by placing the test leads of a multimeter on the terminals of the capacitor.
2.
Multimeter needle should move rapidly toward top of the scale; then, slowly return toward zero if the capacitor is
good.
3.
If needle moves to top of scale and remains there, the capacitor is internally short-circuited, if the needle does not
move, the capacitor contains an open circuit.
4.
The capacitor has a metal case, check for short-circuits to case by placing a lead of the multimeter on each of the
terminals of the capacitor and the other lead on the case. There will be no deflection of the multimeter needle if the
capacitor is good. If the needle does deflect, and remains there, replace the capacitor.
5.
Replace capacitor with short/open circuits.
INSTALLATION
Capacitor Mounting Plate
1. Position the capacitor mounting plate (17) into the unit housing.
0033 00-2
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