York Turbomaster M Series, Installation, Operation And Maintenance Manual

Page: 48 / 64

YORK INTERNATIONAL
48
FORM 220.11-NM2 (602)
REPLACING OIL PUMP ASSEMBLY, THRUST BEAR-
ING AND DISCHARGE END JOURNAL BEARING
If the discharge end shaft and thrust bearings are in-
tact, and only show normal wear or slight scoring, it
may not be necessary to flush the complete lubrication
system. Should the bearings show signs of breakdown
with metal particles distributed through the lubrication
system oil galleries, then oil lines should be flushed
and cleaned. Thrust oil is not typically filtered and bear-
ing material may have been carried into the oil cooler.
The compressor sump has three plugs screwed into the
outboard end that seal access holes drilled to construct
the internal oil galleries. It may be necessary to pull
these plugs, remove the external oil piping, and flush
the oil galleries. After cleaning replace the plugs using
an oil or paste sealant. Do not use teflon tape.
Some external oil lines are screwed di-
rectly into the sump with nipples and
fittings. When replacing the parts af-
ter flushing, use only approved seal-
ants (refer to piping prints). Any leaks
discovered after reassembly are diffi-
cult to correct. Inspect and clean all
check valves. Be aware that some
thread sealants will cause check valves
to seize and fail to open properly.
1. Inspect the discharge end shaft journal, thrust
bearings and oil pump. Clean the shaft journal
bearing as explained for suction end journal (See
Removing Suction End Journal Bearing). Do not
use abrasives.
2. When replacing the discharge end shaft bearing, po-
sition the rotor so the shaft hex flats are horizontal.
Service
LD07336
LD07337
FIG. 21 – DISCHARGE END BEARING AND OIL PUMP ASSEMBLY, EXPLODED VIEW