Air Compressor Service (P/N 18--00099); Figure 70 Cylinder Head Removal; Figure 71 O--Ring Installation - Carrier 69NT40-489-100 Series Operation And Service Manual

12.5 AIR COMPRESSOR SERVICE
(P/N 18- -00099)
Prior to the disassembly of the air compressor, follow
the steps in section 12.2.a for removal of the air
compressor from the
disassembling the compressor, matchmark parts so
that they may be replaced in their same relative
positions.
Tools needed:
a. Open end wrench, 3/16 inch
b. Open end wrench, 7/16 inch
c. Open end wrench, 15/16 inch
d. Torque wrench (in/lb)
e. Allen wrench, 3/16 inch
f. Allen head socket, 3/16 inch
g. Compressor Rebuild Toolkit
CRANKCASE FILTER REPLACEMENT
Locate filter and tubes on top of compressor.
Inspect tube fitting for excessive debris in air
passage. Clean air passage of elbow fittings if
necessary.
Disassembly:
1. Disconnect the tubes from the compressor using a
7/16 open--end wrench.
2. Remove tube and filter ends from each brass fitting,
by carefully pulling on tube at each end of the fitting.
Do not remove elbow fittings from crankcase or cylin-
der head.
3. Discard old filter assembly.
Installation:
1. Install nut/sleeve on tubes at each end of the filter.
Position the threaded end of the nut away from the fil-
ter. There is an arrow on the side of the filter for direc-
tion of air flow. Position the filter so arrow points away
from the crankcase fitting and toward the head fitting.
2. Carefully insert each tube end into the appropriate fit-
ting.
3. Connect tubes and tighten fittings with a 7/16 inch
open--end wrench
.
COMPRESSOR RING REPLACEMENT
Disassembly:
1. Remove compressor from container installation to
access the head assembly.
2. Place the compressor in a reasonably clean area
where there is an adequate area to disassemble the
unit.
3. Locate crankcase filter (Item 3, Figure 77) . Use a
7/16 open--end wrench to completely loosen the nut
of the tube fitting near the crankcase. Carefully re-
move the filter tube from the fitting.
4. Use 15/16 open--end wrench to loosen nuts on man-
ifold elbows. Loosen all 4 nuts.
T-305
refrigeration unit. When
Note
5. Use 3/16 Allen wrench to remove 8 socket head cap
screws ( Item 7 ) from cylinder flange.
6. Mark orientation at cylinder to crankcase to ease re--
assembly

Figure 70 Cylinder Head Removal

7. Pull each cylinder and head assembly away from
crankcase. Removing the cylinder may require a
slight twist motion back and forth, because of an o--
ring seal. Keep cylinder shims with each cylinder. See
Figure 70.
8. Remove old manifold sleeve ( Item 9, Figure 77) from
manifolds
9. Remove o--ring ( Item 12) from bottom of each cylinder.
10.Remove piston rings, piston seals, and rider ring
from each piston (Items 20--23) .
Inspection:
1. Inspect crankcase filter (Item 3). If filter appears dirty
or clogged, replace with filter kit.
2. Inspect cylinder wear surface for scoring or
scratches. If scoring is present, replace cylinder.
3. Inspect piston bearings for excessive radial move-
ment (looseness). If bearing exhibits more than .005
radial movement, replace compressor rods with ma-
jor rebuild kit.
Assembly:
1. Install new piston seals below new piston rings on
each piston.
2. Install new rider ring on each piston.
3. Install new manifold sleeves on the end of each man-
ifold. Be sure that nut for manifold elbow is on man-
ifold prior to installation of sleeves.
Figure 71 O- -Ring Installation
4. Install new o--ring ( Item 12 ) on bottom of each cylin-
der ( Item 17 ). Place gaskets on bottom of each cylin-
der. Lubricate o--ring with small amount of silicone lu-
bricant. See Figure 71.
122