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FIG. 24 – EXPLODED VIEW, OIL RESERVOIR AND OIL SEAL ASSEMBLY
Screw a short stud into one of the lower holes in the
oil sump face. Slip a piece of pipe over it to obtain
some leverage so you can maneuver and level the
housing as you ease it out.
6. The retaining ring (35), spring washer (33), models
226 and 238, universal spring (34), model 255, and
seal ring (32) can now be removed. Note correct
orientation of seal relative to the step faces. If in-
stalled incorrectly, severe oil loss can occur.
If the seal is assembled incorrectly se-
vere oil loss can result.
A-4 seal ring assemblies are retained by a bolted seal
cover and gaskets. Again note the seal configuration,
the inboard and outboard seal components may not
be the same. If the compressor internal condition is
unusually dirty, with sludge and dirt, remove the seal
ring housing and clean all surfaces.
7. The balance piston cover (158) houses the balance
piston seal ring (32). The entire assembly is fas-
tened to the last stage diffuser by means of cap
screws (See Fig. 23). Remove the cap screws (29),
lockwashers (30), and pull the balance piston cover
(158) through the end of the compressor casing. The
seal ring (159) and spring washer (160) can now be
pulled off the balance piston (Fig. 25 shows an ex-
ploded view of the balance piston seal assembly).
YORK INTERNATIONAL
Observe the pin extending through the spring
washer that prevents the seal from turning. Early
model compressors did not have this pin. The addi-
tion of an anti-rotation pin is recommended when
service provides access. This may require procure-
ment of a new last stage exit plate if not equipped
with a "windage" baffle.
Some balance pistons are integral with
the high stage wheel and some are
bolted on. If the balance piston is
bolted on do not remove it in the field.
It may cause unbalance in the rotor
after reinstallation.
8. Inspect all parts. Oil seal rings should always be re-
placed. If the balance piston seal ring grooves show
no wear and the clearances are acceptable, reuse
the seal ring. (Note: there are numerous diameters
and clearances for each compressor size. Seal ma-
terial may vary with the application and clearance is
a function of seal material and compressor speed.)
REPLACING DISCHARGE END SEAL RING AND BAL-
ANCE PISTON SEAL RING
1. Inspect new seal parts for nicks and burrs. Remove
any sharp edges. Carefully assemble seal compo-
nents. With A-1 seals be sure of correct orientation
relative to the spring washer. Snap the retainer into
place.
FORM 220.11-NM2 (602)
4
LD07340
51
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