Table 5-1. Troubleshooting (Con't
TEST OR INSPECTION
f. Remove the cover (1) , pressure
adjusting screw (4) , differential
adjusting screw and nut (5) , top bar (6) ,
spring equalizer (8) , main spring () ,
conical spring (3) , contact board
assembly (7) , toggle spring (10) ,
toggle (11) , lever (12) , plate
diaphragm (13) , diaphragm (2) , frame
assembly (14) and enclosures (15).
g. Inspect the contact board contacts (7)
for pitting or burning. Use sand paper to
remove pitting or burning.
h. Inspect diaphragm (2) for cracks or
breaks and general condition
i. Inspect all threaded parts for damaged
or defective threads.
j. Replace damaged or defective parts as
k. Reassemble the pressure switch starting
with the enclosure (15), then frame
assembly (14), diaphragm (2), plate
diaphragm (13), lever (12) , toggle (11) ,
toggle spring (10), contact board
assembly (7), conical spring (3) , main
spring (9), spring equalizer (8) , top
bar (6), differential adjusting screw and
unit (5), pressure adjusting screw (4)
and cover (1).
l. Install pressure switch assembly on air
m. Connect all electrical wiring.
n. Turn on outside power source.
Step 1. Check intake muffler to see
a. Wipe off the outside of the muffler body.
if it is clogged
disassemble the intake muffler as follows:
(1) Remove wing nut (13) , lower cover (14),
screen (15) , element (16) , separator (17) ,
plate (18) , upper cover (19) , ferrule (20)
and T-stud (21).
Dry cleaning solvent P-D-680, used to clean parts is potentially dangerous to
personnel and property. Use in a well ventilated area as the fumes are dangerous
if inhaled. Do not use near open flame or excessive heat. Flash point of solvent is
100 F. - 138F. (38C. 59 C.).