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Service
FIG. 17– REMOVING THE DRIVE END JOURNAL
BEARING ASSEMBLY
Remove one end bearing at a time, re-
placing same before removing the
other bearing.
REMOVING SUCTION END JOURNAL BEARING
The actual bearing can be removed without removing
the bearing housing which is described in this section.
To replace the drive end journal bearing (16) refer to
Figs. 17, 18, and 19 and proceed as follows:
1. See section on Preparation for Servicing. Transfer
refrigerant from unit to storage receiver. Drain oil
from compressor.
2. Remove coupling guard and driven coupling disk.
(See Removing Driven Coupling Disk.)
3. Remove the shaft seal. (See Shaft Seal Replacement.)
4. To remove the suction end journal bearing proceed
as follows:
A. Remove snap ring (17), using snap ring pliers
supplied with compressor tools.
B. To remove the bearing, install screws in tapped
holes in bearing (see Table 13 for screw size).
Apply a slight upward force to the drive shaft
and pull bearing from the bearing housing us-
ing the screws as handles.
42
LD07332
FIG. 18 – REMOVING THE DRIVE END OIL SEAL
ASSEMBLY
C. Suction end journal bearings are designed in
several styles, taper bore and taper land are
most common. Taper bore has a smooth single
surface ID that actually tapers end to end. The
taper land journal bearing ID has been ma-
chined so most of the bearing area has been
relieved to form three dams or pockets offset
at 120°. The inboard and outboard ends of the
bearing have pressure dam areas to hold oil
within the bearing. Both styles of suction end
journal bearings are located radially by a roll
pit at 12 o'clock fitted into a slot in the bearing
flange. The pin location is critical for a taper
land bearing application.
D. Examine the bearing and determine the extent
of any damage. Look for imbedded particles
and scoring, evidence of plastic flow, extreme
wear at some radial point, grey powdery resi-
due, and erosion in the external annular oil
groove. Also check that the locating pin has
not sheared off allowing the bearing to spin.
Foreign material infiltrating the oil supply sys-
tem is the most likely cause of scoring. Check
that an oil filter is in the housing.
Plastic flow indicates the bearing has experi-
enced extremely high temperature, usually due
to poor lubrication. It may also show break-
down of bearing with particles circulated
FORM 220.11-NM2 (602)
LD07333
YORK INTERNATIONAL
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