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TABLE 12 - CLEARANCES (INCHES) TYPICAL
COMPRESSOR
THRUST BEARING
SIZE
AXIAL CLEARANCE
25"
.008 - .012
26"
.008 - .012
38"
.010 - .014
55"
.013 - .017
VOLUTE SEAL
COMPRESSOR
DIAMETRAL
SIZE
CLEARANCE
25"
.004 - .007
26"
.003 - .009
38"
.003 - .009
55"
.004 - .011
COUPLING
COMPRESSOR
SIZE
SIZE
1"
25"
1-1/4"
25" & 26"
1-1/2"
25", 26" & 38"
1-7/8"
26", 38" & 55"
2-1/2"
38" & 55"
3"
38" & 55"
3-3/4"
55"
*NOTE:
Assembly clearance is dependent on rotational speed. Some high speed compressors require greater clearance. Aluminum seals only see
compressor application data sheet for other materials.
7. Remove 12-point cap screw (46) and remove the
centrifugal oil pump (41).
8. Remove the thrust bearing or combination thrust
and journal bearing. If combination bearing is
used, raise rotor shaft to ease removal.
Separable journal bearings are posi-
tioned away from the thrust bearing
with a roll pin or a ventilated spacer.
9. Separate thrust bearings come in two styles, hy-
drostatic flat aluminum and tilting pad with Babbit
metal shoes. The hydrostatic thrust is sometimes
incorporated with the discharge end shaft bearing
as a single unit. Both styles of aluminum thrust
bearings are used with an oil pump that has pock-
ets on the forward thrust face. These pockets act
46
MAXIMUM OIL PUMP
RUNOUT (T.I.R.)
FACE
.0005
.0007
.0010
.0013
*BALANCE PISTON
SHAFT LABYRINTH
SEAL DIAMETRAL
DIAMETRAL
CLEARANCE
CLEARANCE
*
.011 - .014
*
.014 - .024
*
.020 - .030
*
.020 - .039
DIAMETRAL
SUCTION END
CLEARANCE
BEARING
SHAFT TO BEARING
LENGTH
(SMALL END, TAPER BORE)
1-9/16"
.0015 - .0035
1-11/16"
.002 - .004
2-3/8"
.002 - .004
3-1/4"
.0025 - .0045
4-7/32"
.003 - .005
5-1/4"
.004 - .006
6"
.006 - .008
OIL SEAL DIAMETRAL CLEARANCE
RIM
DRIVE END
.0005
.002 - .005
.0006
.002 - .005
.0008
.003 - .006
.001
.004 - .008
IMPELLER INLET
LABYRINTH DIAMETRAL
CLEARANCE
.0112 - .017
.020 - .025
.030 - .037
.044 - .053
DIAMETRAL
CLEARANCE
SHAFT TO BEARING
TAPERLAND
.0015 - .0035
.002 - .004
.003 - .005
.003 - .005
.004 - .006
.005 - .007
.006 - .008
TABLE 13 – SCREW SIZES FOR PULLING DRIVE
END JOURNAL BEARING
COUPLING
COMPRESSOR
SIZE
(INCHES)
226
1-1/2
1-7/8
238
2-1/2
255
3-3/4
as oil pumps, circulating oil across the thrust face
and out through small holes, which develop oil
pressure greater than the compressor main oil pres-
sure. Oil off the thrust is circulated through the oil
coolers and returned to the sump via the jet pump
nozzle.
FORM 220.11-NM2 (602)
RESERVOIR END
.001 - .004
.002 - .007
.002 - .007
.002 - .007
RESERVOIR END MAIN
BEARING DIAMETRAL
CLEARANCE
(SMALL END, TAPER BORE)
.001 - .003
.002 - .005
.002 - .005
.0025 - .0055
DIAMENTRAL
CLEARANCE
BEARING TO BEARING
HOUSING
.0005 - .0025
.0005 - .0025
.001 - .003
.001 - .003
.0015 - .005
.002 - .0055
.002 - .0055
SCREW
SIZE
10-24
10-24
1/4-20
3
3/8-16
3
3/8-16
3/8-16
YORK INTERNATIONAL
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