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5. Loosen the cap screws which secure the shaft seal
cover plate and carefully loosen the plate using jack
screws so that the oil in the seal cavity can drain.
Place a bucket under the seal cavity to catch drain-
ing oil.
6. Carefully remove the shaft seal ring assembly after
the oil from the seal has drained. Examine the seal
ring sealing surface to possibly determine the cause
for the seal leaking. (See Fig. 14B, Item 5).
7. Pull the shaft seal collar (7), with its O-ring (4) off
over the coupling end of the shaft. Two pieces of
steel tubing (flattened at the end and bent to form a
hook) may be used to pull the collar loose.
8. Disassemble the seal ring assembly as follows:
A. Remove the three flathead machine screws (9).
B. Carefully pull seal retaining ring (8) off the
cover (1).
C. Carefully pull the shaft seal ring (5) from the
cover and remove the O-ring (4) from the slot
on the inside of the shaft seal ring.
D. Remove the spring retaining washer (3) and
the springs (2).
9. Examine the insert pins (6) located on the shaft, if
no damage is evident leave pins in place. If it is
necessary to replace the pins, remove the drive shaft
to prevent damage during pin removal. (See Re-
moving Drive Shaft.) If insert pins are damaged,
pull with pliers being careful not to damage the
finished surfaces of the drive shaft. When insert
pins are pulled replace with new pins.
Installing the New Shaft Seal
To install the new seal assembly, refer to Figs. 14, 15
and 16 and proceed as follows:
1. Be sure that the drive shaft under the seal area is
smooth and free of burrs. Thoroughly coat the new
seal parts with new compressor oil of proper des-
ignation.
2. Insert the O-ring (4) in the carbon seal ring.
3. Place a pencil mark on the new shaft seal collar
(7), but not on the seal surface, to locate the slots
(Refer to Fig. 14B). Carefully slide the new shaft
seal collar (7) less O-ring (4) on to the enlarged
shoulder on the inboard end of the drive shaft so
that the two slots (marked by a pencil) slide over
the insert pins, the inside surface of the collar is
against the rotor shaft, and the rotor is on its active
thrust face, shaft out. Measure "Y" per Fig. 15.
Remove shaft seal collar (7) from shaft and reas-
semble with O-ring (4) installed in shaft seal collar
YORK INTERNATIONAL
(7). Measure "Y" per Fig. 15. The "Y" measure-
ment should be the same as the first measurement
assembled without O-ring (4). The collar must not
be cocked on the shaft and the O-ring must not be
pinched between the edge of its groove and thread
shoulder of the shaft. If this happens, the O-ring
will be cut and a new O-ring must be used. Repeat
measurement "Y" to ensure proper seating of the
shaft seal collar. If "Y" is less, then the shaft seal
collar is not seated properly. If "Y" is greater, the
rotor possibly moved off its active face. If not re-
peat Step 3, etc. to the end of this paragraph.
4.
Installation height "X". Refer to Fig. 16 and the
compressor drawing and use the following formula:
"X" is the dimension of the seal when
assembled in the compressor. It is not
the measured dimension of the seal
assembly on the "bench". Figures 14
& 16 depicts the carbon ring being de-
pressed into the retainer to the instal-
lation height. Failure to install the seal
assembly to the specified Dimension
"X" ± 1/64 may result in premature
failure or excessive leakage of the seal.
If dimension in table differs from
drawing use the drawing dimension
for "X".
"X" – "Y" (from Fig. 13 or drawing) = Gasket thick-
ness to be used ±1/64 inch.
5. Assemble the shaft seal ring assembly and gasket(s)
in the compressor. (See Fig. 16 for shaft seal parts
identification.)
When pulling the cover plate into
place by tightening the cap screws
evenly, be careful to prevent cocking
the plate and damaging the carbon
seal ring.
6. Reassemble the flexible coupling. Check and record
coupling alignment (see Form 160.71-N2).
7. Install coupling guard. Pressure test and evacuate
unit per instructions.
8. Restore the oil level in the reservoir (see Adding
Oil to the Compressor) and recharge system with
proper amount of refrigerant.
FORM 220.11-NM2 (602)
4
41
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