Cracks; Chips And Holes; Inserts; Door Hinge Inserts - Carrier 69NT40-489-100 Series Operation And Service Manual

6.24.2 Cracks

Cracks in the control box are repaired using a fiberglass
patch over the damaged area. Materials required are
included in the Fiberglass Patch Kit supplied with Crack
Repair Kit, Carrier
76-00724-00SV (refer to Table 13, page 79).
a. The surface must be clean and dry. Roughen the sur-
face with sandpaper to ensure a good bond.
b. Cut the fiberglass cloth to allow a 25mm (1--inch)
overlap around the area to be repaired.
c. Stretch and position the cloth over the area to be re-
paired and secure it with masking tape.
d. Make up sufficient epoxy glue to cover the cloth by
mixing equal parts of resin and hardener. Saturate the
cloth with the epoxy glue, spreading evenly.
e. Remove the tape and overlap the edge of the cloth
approximately 6 to 12 mm (1/4" to 1/2") with glue.
f. Epoxy will dry in 45--60 minutes. When completely
cured (12 hours), use sandpaper to smooth edges of
the patch.

6.24.3 Chips And Holes

Chips and holes in the control box are repaired using a
piece of aluminum or stainless steel to cover the
damaged area. The material can be cut to suit and
riveted in place. An adhesive sealant must be used to
make the repair watertight. The adhesive sealant
(Sikaflex 221) is included in Crack Repair Kit Carrier
Transicold part number 76-00724-00SV (refer to
Table 13, page 79). Do not use an acetone based
silicone sealant (Which can be identified by a
vinegar--like odor).
a. To make up the patch, cut a piece of aluminum or
stainless steel so that it will overlap the damaged area
by at least 40 mm (1 1/2") on all sides.
b. Choose rivet locations and drill the rivet holes in the
corresponding locations on the control box and patch
piece.
c. Apply the adhesive sealant around the damaged area
to form a seal between the control box and the patch
piece.
d. Rivet the patch piece in place.
e. File smooth any rough edges (including rivets) that
may come into contact with wires.

6.24.4 Inserts

The threaded brass inserts that are molded into the
control box will need to be replaced if the threads
become stripped, or if the insert becomes loose. The
inserts and epoxy are contained in repair kit, Carrier
Transicold part number 76-50084-00 (see Table 14,
page 79). There are 6 different inserts used in the
control box. Refer to Figure 52 for the locations of the
various inserts.
T-305
Transicold part number
An epoxy application gun is also needed,
Carrier Transicold part number 07--00391--00.
The damaged insert must be removed from the control
box. Table 15 identifies the drill size and drill depth to be
used for each insert. A stop ring should be used on the
drill bit to limit the depth.
a. Center the drill bit on the insert and drill to the pre-
scribed depth.
b. Remove the chips from the drilled hole.
c. Mix the two component epoxy and fill the hole 1/2 way
to the top with epoxy.
d. Press the insert in until it is flush with the surface.
e. Wipe away any excess epoxy. The part is ready for
service after the bond material has hardened and is
tack free (approximately 20 minutes)

6.24.5 Door Hinge Inserts

If the door hinges have been pulled from the control box
drill and reinstall the hinge as shown in Figure 51, page
78 and described in the following steps:

Figure 51. Door Hinge Repair

Materials needed:
1. Cut two square pieces of 3 mm thick (1/8 inch) alumi-
num or stainless steel approximately 40 mm (1 5/8")
square. These squares will serve as backing plates.
2. Two nuts, bolts (10 -- 24 x 1") and washers for each
insert that needs repair.
a. Drill a 1/4" hole in the center of each square backing
plate.
b. Pass the bolts through the bolts holes in the door
hinge, then through the control box at the location
where the hinge insert pulled out.
c. From inside the control box, slide the backing plates
over the bolts and secure in place with the washers
and nuts.
78
NOTE