9.Place a clean, lint-free cloth on a smooth, sturdy work surface. Place the seal housing assembly on the cloth with the face of the contact sleeve in contact with the cloth. While one person pushes down on the housing to compress the spring, another person must remove the snap ring. Then, slowly let the seal housing rise until the spring is fully extended.
10.Remove Items 2B and 12 (O-rings).
11.Slide the outer carbon ring (Item 19) off the shaft.
12.Remove the lubricating tube (Item 1) and gasket (Item 24).
13.Remove the inner carbon key (Item 36).
14.Remove the inner seal retaining screws (Item 23) and the diaphragm retainer (Item 22).
15.Using a spanner wrench, loosen the lock nut (Item 15). The lock nut has a right-hand thread. Remove the lock nut. The inner seal spring (Item 27) may push the con- tact ring part way out as the lock nut is loosened.
16.Carefully slide the rotating contact ring (Item 21) off the shaft. The ring slips onto the shaft with a very close tolerance and is prone to sticking. Slide it slowly to avoid a tight jam. To release, tap gently with a SOFT hammer.
17.Remove O-ring (Item 14). This O-ring will be crushed into a triangular shape. Since it is not an ordinary O-ring gland, this is normal. Always replace with a new O-ring.
18.The seal gland sleeve (Item 29) can be removed, but it is generally not necessary to do so. If the seal gland is removed, make sure it is reinstalled with the bevel (that contains the O-ring) facing outward.
19.The inner carbon ring (Item 26), the diaphragm (Item 25), the inner carbon guide ring (Item 34), and the inner seal spring (Item 27) can be removed as an as- sembly. The carbon ring is held to the guide ring by raised barbs on the guide ring. Carefully pull the carbon ring from the guide ring. The diaphragm can now be re- moved from the guide ring. Inspect the diaphragm for wear.
20.To remove the inner seal retainer (Item 28) and O-ring (Item 35), use 4 screws (Item 23) in the 4 threaded holes spaced evenly around the seal retainer to jack the part out of position.
If the inner seal shims are damaged, carefully measure them so that a shim package of the same thickness can be in- stalled. The thickness of the shim package should not be changed unless the compressor shaft and/or thrust bearing are re- placed. Replacing either of these items could affect the ¯oat of the inner seal. This ¯oat is adjusted by varying the thick- ness of the shim pack.
This completes the disassembly of the seal.
Clean all parts to be reused with solvent, coat with oil and place in a protected area until needed.
SEAL REASSEMBLY (Fig. 36) Ð Be sure that all gasket surfaces are clean and that all holes, including oil holes, are properly aligned between the gasket and mating ¯ange. Coat the gasket with oil-graphite mixture to prevent sticking.
1.Install the inner seal retainer (Item 28) and O-ring (Item 35). Then, remove the bolts to allow installation of the inner seal assembly.
2.Replace the seal gland sleeve (Item 29) if it has been removed. Make sure that the plain side is against the shaft shoulder and that the beveled side is facing outward.
NOTE: If the seal gland sleeve is oriented improperly, refrigerant will leak under the contact ring.
3.Place the diaphragm (Item 25) over the inner seal re- tainer (Item 28). With the best lapped sealing face of the carbon away from the diaphragm and the notch for the key centered between two of the bolt holes in the dia- phragm, gently push the inner carbon ring (Item 26) into the inner carbon guide ring until it is tight against the diaphragm. Make sure that the diaphragm is not wrinkled or folded between the carbon and the retainer. Place the spring (Item 27) over the back of the guide ring. Place this assembly into the seal, and make sure that the car- bon face can travel a minimum of 0.06 inches (1.5 mm) in each direction from the outside edge of the seal gland sleeve (Item 29).
4.Install the O-ring (Item 14). Slide the rotating contact ring (Item 21) into position against the seal gland sleeve. Install the lock nut (Item 15) and tighten it with a spanner.
5.Gently rotate the inner seal assembly to line up the bolt holes in the diaphragm with the bolt holes in the inner seal retainer (Item 28). Place the diaphragm retainer over the diaphragm with the beveled side toward the dia- phragm. Install the 14 one-inch long screws (Item 23), leaving the top 2 holes on either side of the notch in the carbon open. Tighten to 2 ft-lb.
6.Install the inner carbon key (Item 36) using the 1-1/4-in. screws (Item 37). Tighten to 2 ft-lb.
7.Install the lubricating tube (Item 1) and gasket (Item 24).
8.Lightly coat the outer carbon ring with compressor oil. Then, slide the outer carbon ring (Item 19) into position against the rotating contact ring.
9.Install O-ring (Item 12).
10.Place the contact sleeve (Item 18) face down on a clean, lint-free cloth on a smooth, hard, work surface, and place the contact sleeve spring over the sleeve. Lightly coat the outside surface of the contact sleeve with compres- sor oil. While one person places the seal housing (Item 3) over the contact sleeve and presses the spring down, another person must install the snap ring (Item 16) in the groove around the small end of the con- tact sleeve. Once the snap ring is ®rmly seated in the groove, slowly let the seal housing rise until the snap ring rests against the housing. Rotate the sleeve in the seal housing until the key slot in the sleeve is in line with the bolt hole for the contact sleeve key (Item 11).
11.Install the O-ring (Item 2B) into its groove, and place the seal housing into position on the compressor. Guide rods can help accomplish this task. Place the coupling guard mounting ring (Item 4) over the seal housing, and fasten both in place with 8 hex-head bolts (Item 6). Draw in the housing against the seal spring by tightening the bolts in steps in a crisscross pattern to draw the housing evenly.
12.Once the bolts have been tightened, remove the snap ring from the contact sleeve, and set it aside.
13.Install the contact sleeve key (Item 11).
14.Install the shaft end labyrinth (Item 8) and the windage baffle using screws (Item 9). The split lines of the laby- rinth and windage baffle should be located 90 degrees apart.
15.Mount the snap ring (Item 16) on the screws (Item 41) near the inside surface of the windage baffle.
16.Reconnect the tubing from the atmospheric oil chamber to the coupling (Item 20).
The reassembly of the seal is complete.
Run the oil pump to ®ll the seal, and rotate the shaft sev- eral times by hand before leak testing.
