4. Remove the four socket head screws that hold the
packing box cartridge to the barrel.
5. Remove segmented packing and cups from barrel.
6. Remove lower retainer ring, washers, packing spring
and old V-ring packing from packing box cartridge.
Assembly of Packing (D-Style)
1. Replace packing as required. The segmented packing
and cups are located in the packing barrel while the
V-ring packing is located in the packing box cartridge.
NOTE: Always use new O-rings when replacing
the packing.
2. V-ring packing set:
NOTE: The instructions below are for packing
specification “J”. Depending on the packing
specification used in your compressor, the order
of assembly for the packing rings, V-ring packing,
washers and packing spring will vary. Refer to
Appendix E to view the V-ring packing arrangements
and follow the order of assembly and V-ring direction.
If you do not know the packing arrangement used
in your compressor, refer to the model number
identification codes listed in Appendix A.
a. Clean and lightly oil the packing area inside the
packing box cartridge.
b. Insert the oil deflector ring through the bottom
opening of the packing box cartridge.
c. Insert the first retainer ring followed by a washer.
d. Insert the packing spring followed by another
washer.
e. Insert a male packing ring followed by four V-rings
and one female packing ring. NOTE: Insert
packing rings and V-rings one at a time. Refer
to Appendix E for the proper direction of the
male and female packing rings and V-rings.
f. Lastly, insert the final washer. Push in on the
washer and install the second retainer ring.
3. Segmented packing:
NOTE: The instructions below are for packing
specification “J”. Depending on the packing
specification used in your compressor, the order of
assembly for the segmented packing arrangement
(radial or tangent) will vary. Refer to Appendix E
to view the segmented packing arrangements. If
you do not know the packing arrangement used
in your compressor, refer to the model number
identification codes listed in Appendix A.
a. Clean the segmented packing cups and the area
inside the packing barrel.
b. Insert the segmented packing cups, segmented
packing pairs and backup rings one at a time in
the order shown in Appendix E.
c. Reattach the packing box cartridge to the packing
barrel using the four socket head screws.
4. Install three O-rings on the packing barrel and packing
box cartridge as shown in the D-Style Crosshead
Guide Assembly Details in Appendix E.
5. Install packing installation cone part number 3905 over
the threaded end of the piston rod.
6. Carefully install barrel/cartridge assemblies over the
piston rods, noting the alignment of the barrels as they sit
on the crosshead guide. The valve scallops on the barrels
must align properly with the valves in the cylinder.
7. Remove packing installation cone.
8. Replace pistons, cylinders, heads and cylinder cap. See
details in Section 4.4 for proper assembly of pistons.
9. Rotate unit by hand to ensure proper assembly.
4.6.2 Model T791 and T891 Compressors (T-Style)
On Models T791 and T891 there are two sets of V-ring
packing in a separate packing box cartridge held in
the crosshead guide by a cartridge holddown screw. A
packing adapter holds the segmented packing inside the
packing barrel.
Disassembly of Packing (T-Style)
1. Depressurize and open the compressor.
2. Remove the cylinder cap, heads, pistons and cylinder.
3. Remove the packing barrels.
4. Remove the four socket head screws that hold packing
adapter to the barrel.
5. Remove segmented packing and cups from barrel.
6. Remove cartridge holddown screws with special
wrench supplied with the compressor, and remove
cages and packing box cartridges.
7. On the lower V-ring packing set, remove adjusting
screw, washers, packing spring and old packing from
each packing box cartridge.
8. On the middle V-ring packing set, remove upper
retainer ring, washers, packing spring and old packing
from each packing box cartridge.
15
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