4-16. REMOVE/INSTALL PURGE PORT DAMPER ASSEMBLY - continued.
Drill out eight rivets securing purge opening frame to laboratory wall.
Remove two screws and nuts attaching limit switch to laboratory.
Remove damper mechanism from damper housing. See figure 4-7.
Remove four screws, nuts, lockwashers and flat washers attaching damper mechanism
to damper housing.
Remove damper mechanism with motor attached.
Remove damper motor and motor bracket. See figure 4-7.
Loosen setscrew attaching motor linkage to damper mechanism. Unsnap linkage from
motor and retain.
Remove two screws, lockwashers, and flat washers attaching damper motor to damper
motor bracket and remove motor.
Remove two screws, nuts, lockwashers, and flat washers attaching motor bracket to
damper mechanism and remove defective bracket.
Install purge door limit switch. See figure 4-7,
Install new limit switch by fastening in place on laboratory wall with two screws and
nuts, tighten in place.
Install eight rivets securing purge opening frame to laboratory wall.
Reconnect switch electrically at junction box.
Install motor bracket and motor in damper mechanism. See figure 4-7.
Install new motor bracket by fastening bracket to new damper mechanism with two
screws, flat washers, lockwashers, and nuts.
Tighten bracket mounting screws and nuts.
Attach new motor to motor bracket with two screws, flat washers, and lockwashers.
Tighten motor mounting screws.
Attach motor linkage to motor by snapping in place.