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Service
The common causes of the compressor problems listed
above are not the only ones. Be sure to exhaust all of
the external possibilities by means of appropriate test-
ing before opening the compressor for service.
USE OF COMPRESSOR TOOLS
Special tools are furnished with each compressor (see
Table 9). The wrenches (1) are used for removing the
driven coupling disk nut from the compressor drive
shaft (see Fig. 9), and for removing the driven cou-
pling disk from the driver (speed increaser, turbine,
etc.). These wrenches and wrench support (Table 9, Item
2) and main shaft wrench (Table 9, Item 6) are used to
remove the compressor drive shaft from the compres-
sor main shaft.
Removing the Driven Coupling Disk
Follow safety guidelines to isolate
machine from operating.
1. Remove both coupling guard halves and associated
supports (See Figs. 10 and 11). Although matching
marks are not a requirement, marking part locations
with a marking pen will allow the parts to be reas-
sembled in the order they were removed.
2. Loosen and remove the hex socket screws, nuts and
washers.
3. Place the compressor side clamp ring onto the drive
shaft.
Use 12-point wrench on coupling nut.
Remember these are double lead left
handed threads at the driver, 12 pt. nut
and drive shaft to rotor interface.
4. Install the wrenches (Table 9, Item 1) as shown in
Fig. 9. Use drive thread compound on the special
trunnion screw.
5. Loosen the coupling nut and remove the wrenches.
6. Screw the nut onto the drive shaft to allow the spac-
ers to be removed. Be careful not to let the driven
compressor disk fall to the floor.
7. Remove the driven compressor disk and spacers.
36
Removing the Drive Coupling Disk
1. Be sure the clamp ring is in the driven disk.
2. Install the wrenches (Table 9, Item 1) with the 12-
point wrench on the hex of the drive coupling half.
The wrench will not bear on the entire flat of the
hex on the driver extension.
3. Loosen the drive coupling disk and remove
wrenches.
4. Move clamp ring onto the driver shaft.
5. Remove the drive coupling disk and clamp ring.
Removing Compressor Drive Shaft
The removal of the drive from the compressor requires
the use of special tools, (See Table 9). To remove the
drive shaft use the following procedure:
Follow safety guidelines to prevent
compressor from operating.
1. Remove the coupling guard. (See Fig. 10)
2. Remove the 12-point nut holding the coupling to the
shaft.
3. See Removing the Driven Coupling Disk.
4. Remove the shaft seal cover and seal. (See Re-
moving the Shaft Seal)
5. Reinstall the 12-point nut on the compressor drive
shaft.
6. Install the support wrench (Table 9, Item 2) as shown
in Fig. 11 and Fig. 13 – Detail A. Install wrenches
(Table 9, Item 1 and 6).
7. Disconnect the electrical wiring to the oil heaters.
(Make sure fused disconnect switches are open.)
8. Remove refrigerant charge. See Preparation for
Servicing Compressor, and drain oil.
9. Remove the oil sump cover.
10. See Removing and Replacing Oil Pump. Remove
the jet pump, associated piping, the centrifugal oil
pump and thrust bearing (See Replacing Oil Pump
and Thrust Bearings and Oil Sump Main Bearing).
11. Install the main shaft wrench (Table 9, Item 6) as
shown in Fig.13 – Detail B.
12. Remove the drive shaft by turning the special screw
to loosen the drive shaft.
13. Remove wrenches.
14. Remove coupling nut.
15. Remove compressor drive shaft.
FORM 220.11-NM2 (602)
YORK INTERNATIONAL
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