4-30 Spring Lock Snap (fig. 4-6)
remove the transition plate from the top of the
heater storage tube assembly.
a. Removal. Remove 3 spring lock snaps by
b. Inspection. Inspect the mounting screws for
separating the top ends and removing from the
bends and damaged or stripped threads; check the
retaining slots in the duct storage tube. Rotate the
transition plate for breaks, cracks, and distortions;
hinge end of the clip to remove if from the slot in the
and check the anchor pin for bends and breaks. If
duct storage tube.
the transition plate is defective replace it with a ser-
b. Inspect. Replace unserviceable spring lock
viceable' one.
snaps.
c. Installation. Reverse the procedure in a. above.
c. Installation. Replace by reversing procedure in
a. above.
4-31 Channel Support (fig. 4-6)
a. Removal. The heater cabinet assembly consists
a. Removal. Remove the two support channels
of the top, the front, and two sides. This assembly
from the storage tube assembly by removing the six
lifts off as a unit after the 28 cap screws securing it
bolts, nuts and washers.
are removed, plus the temperature sensing bulb cot-
b. Inspect. Check the channels for serviceability
ter pin retainer.
and replace if unserviceable. Service by cleaning and
b. Inspect. Check the cabinet for cracks, dents and
painting.
missing hardware. Service by cleaning and painting.
c. Installation Reverse procedure in a. above.
If unserviceable, replace.
c. Installation. Replace the cabinet by reversing
a. Removal. Unfasten the 3 duct storage tube
the procedure in a. above.
spring lock snaps from the duct storage tubes, and
remove the 6-inch flexible duct assembly.
4-35 Door Assembly (fig. 4-8)
b. Inspection
(1) Check for bent or missing anchor pins, bent
a. Removal. Remove the 8 cap screws securing the
mounting flanges, and loose or missing rivets.
door assembly frame to the heater cabinet. Lift out
(2) Inspect for torn canvas and ripped seams
the door assembly.
and for deterioration of fibers.
b. Disassembly. Remove the sight glass by un-
screwing from the securing unit welded to the inside
(3) Check the duct spiral reinforcing wire for
of the door.
breaks or crushed coils. If the 6-inch flexible duct
assembly is defective, replace it with a serviceable
c. Inspect. Check parts for serviceability, damaged
threads, dents, cracks, deterioration and cloudy
one.
c. Installation. Reverse the procedure in a. above.
glass. Replace unserviceable parts.
d. Assembly. Reverse procedures used in b. above.
e. Installation. Reverse procedures used in a.
above.
a. Removal. Loosen the three thumbscrews and
