Advertisement
The aluminum thrust bearing, oil pump, and jet
pump assembly are dedicated items and must be
used together.
The tilting pad thrust bearing is used with an oil
pump that has a flat forward thrust face and is not
designed to pump oil. Thrust oil is still circulated
through the oil coolers, but at a lower pressure,
equal to or somewhat lower than main oil pres-
sure. Thrust oil pressure is a function of oil pump
design, thrust bearing design, and compressor
RPM.
The tilting pad thrust bearing, oil pump, and jet
pump assembly are also dedicated items and must
be used as an assembly.
All thrust bearings are located in position with
a roll pin to prevent rotation within the bearing
recess.
The reverse thrust bearing is a flat aluminum disk,
or tilting pad type bearing, that doesn't contact
the oil pump reverse face during normal opera-
tion. It acts as a "bumper" to limit rotor end float
should the rotor move to the rear for any reason
FIG. 20 – OIL RESERVOIR
YORK INTERNATIONAL
It's positioned in the oil pump housing and is held
in place with a roll pin to prevent rotation within
the housing.
The discharge end journal bearings
come in two styles, taper bore and
taper land. (See Removing Suction
End Journal Bearing for explana-
tion.) The same restrictions on roll
pin location apply if a bearing must
be repositioned radially. Refer to sec-
tion on Suction End Journal Bear-
ings for description.
10. Screw puller rods into the discharge end main bear-
ing and pull it off the rotor journal. If the main
bearing is separate from the thrust bearing, it is
positioned axially in the bearing recess by a roll
pin inserted in the bearing flange that extends
against the thrust bearing or a ventilated spacer
disk between them. The shaft bearing is positioned
radially by a roll pin fitted into a slot in the bear-
ing flange at 12 o'clock.
11. After disassembly, inspect all parts for wear or
damage.
TABLE 14 – GENERAL BOLT TORQUES
BOLT SIZE
(INCHES)
1/4
5/16
3/8
1/2
5/8
3/4
7/8
1
1 -1/8
1 -1/4
NOTE:
Torque values should not be substituted for specific drawing
values or be used for coupling bolts. Refer to Coupling Instruc-
tion. (Form 160.71-NL)
LD07335
FORM 220.11-NM2 (602)
4
BOLT TORQUE
(FOOT POUNDS)
10
20
35
75
155
260
410
600
860
1200
47
Advertisement
