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B. Slide the A-4 seal off the rotor shaft.
C. Pad the shaft again and using the pulling rods
remove the PRV sleeve housing. Record the
thickness and number of both inboard and out-
board gaskets.
D. Examine and clean the A-4 seal as you would
the A-1 seal. These seals must be flat and fit
within the sleeve recesses with proper spring
tension to hold their location.
8. Installation of the new seals.
A. The new seals may be supplied as assemblies
or as individual components. If field assem-
bly is required, carefully follow the instruc-
tions on the as-built compressor drawings.
B. Pad the rotor shaft, install the PRV sleeve with
correct new gaskets.
C. Remove the shaft pad. Coat the A-4 seal as-
sembly ID and the rotor shaft OD with
Molycote and oil then slide the seal into po-
sition in the PRV housing sleeve.
D. Pad the rotor shaft again and slide the A-4 seal
sleeve into position over the A-4 seal. Line up
the roll pin to approximately 12 o'clock and
install the new full bodied gasket.
TIP: Remove the A-4 seal inlet gas fitting from the
bearing housing. Install the bearing housing
guide pins and slip the housing over the pins.
Insert a long snug fitting rod through the seal
gas port of the bearing housing into the inlet
port of the A-4 seal sleeve. Shift the A-4 seal
sleeve until the ports line up and the rod goes
in full depth. This ensures the correct roll pin
position. If the compressor has proximity
probes, the protective sleeve must be installed
in the bearing housing before assembly.
9. Slide the bearing housing in full depth, install the
cap screws and torque to the special value required
by the compressor drawing. Replace all oil lines,
fittings, and gas lines. Maintain cleaniness during
reassembly.
10. Install the shaft bearing and shaft seal as previ-
ously described.
REMOVING OIL PUMP ASSEMBLY, THRUST BEAR-
ING AND DISCHARGE END JOURNAL BEARING
The oil pump, thrust bearings (forward and reverse)
and the reservoir end journal bearing are accessible
through the oil reservoir without removing the casing
top half.
YORK INTERNATIONAL
If it becomes necessary to replace any of these parts,
refer to Figs. 20, 21, 22 and 23 and proceed as follows:
1. Transfer the refrigerant charge. (See Preparation
for Servicing.) Follow guidelines to isolate ma-
chine from operating.
2. De-energize the oil heaters.
3. Loosen compressor drive coupling 12-point nut
and remove the driven coupling disk.
4. Drain the oil from the sump and remove the oil
sump cover.
5. Loosen the 90 degree elbow (54) and remove the
vertical jet pump body (55). It may be necessary
to loosen the jet nozzle (57) to disengage the body
from the elbow.
The current style oil pump housing is
a two piece design (see inset Fig. 21).
When the screws are removed, only
the oil pump housing cover, the re-
verse thrust bearing, and a 1/64" gas-
ket will come loose. Remove the two
recessed cap screws that position the
pump housing body and volute ring.
If proximity probes are used, they must
be backed out a couple of turns be-
fore working on the oil pump hous-
ing. The volute seal ring (42) is se-
cured in the pump housing be means
of a retaining ring (43) and is located
with an insert pin (45). The reverse
thrust bearing is located by means of
an insert pin (45). After removing the
oil pump housing, record the total
number, position, and thickness of all
gaskets.
6. Remove two cap screws (51) from the oil pump
housing. Install guide pins and remove remaining
cap screws. Pull oil pump housing assembly.
The oil pump and thrust bearing po-
sition the rotor shaft axially. With the
oil pump removed, the rotor can shift
forward and damage the shaft seal.
Damage can be avoided by backing
off the seal cover bolts.
FORM 220.11-NM2 (602)
4
45
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