SB--7--627 Page 21
Use care not to damage shim spacers under bear-
ing cartridge with jackscrews.
3.
Remove one bolt at at time, taking out the shims
and marking them for accurate repositioning.
4.
On removal of all bolts, continue using the jack
screws to complete the bearing and cartridge
removal.
5.
Remove the bearing retaining ring from the face
of the cartridge.
A lip type oil seal or mechanical seal is located behind
each bearing on a blower, and a mechanical seal on a
pump.
Lip Type Oil Seal
-- Whenever a cartridge is removed
for repair purposes, always install a new seal before
re--assembly. This can best be accomplished by using
a driving instrument having the same approximate
O.D. as the seal; use caution not to damage the new
seal during installation. Always install the seal with the
lip facing the bearing. Extreme care must be taken to
avoid damaging the sealing elements when they are
moved over the shafts.
Mechanical Seal
(FIGURE 16, page 20) -- Whenever
a mechanical seal must be replaced, the following
procedure should be followed.
1.
Remove the old seal components.
2.
Clean the shaft thoroughly, especially where the
face (item 2) is located.
3.
Coat the shaft with light oil.
4.
It is necessary to use a tapered assembly tool
when installing seal assembly, consisting of items
2 through 6. Be sure that the spring holder (item
4) is pushed against the cap screws.
5.
When installing the seat (item 1) and “O”--ring
(item 7) in the bearing cartridge, it is also
necessary to use a tapered assembly tool to
prevent the “O”--ring from being damaged.
Secure the seal ring (item 1) with three button
head cap screws (item 8).
6.
Tightened cap screws snugly.
Do not overtighten capscrews. Over-
tightening will pull seal ring out of
flatness.
On completion of repair or replacement work, replace
the “O”--ring on the bearing cartridge. Return the
bearing cartridges to their respective shafts and
restore the shim spacers to their original positions.
Bearing backup rings are factory installed against a
shaft shoulder behind each gear and bearing. If these
were removed during bearing cartridge disassembly,
reinstall making certain that the 45
_
Chamfer faces the
shaft shoulder.
Return bearings and secure in position. On force feed
lubricated units the bearing retainer ring must be
installed so that the lubrication notch is at the top and
aligned with the oil passage in the bearing cartridge.
Replace the gears and hubs using the procedure out-
lined in “Timing Gear and Hub Removal,” page 19.
Check the fixed end clearances. If necessary, add or
delete shims behind the bearing cartridge flange as
needed to restore original fixed gear end clearance.
Drive End
-- Remove the drive cover. A drive seal is
located in the seal retainer on the drive cover. Always
replace the drive seal when the drive cover is removed.
Extreme care must be taken to avoid damaging the
drive seal when moving it over the shaft keyway. Wrap
a piece of light shim stock around the shaft to prevent
keyway from cutting the seal element.
To replace the drive end bearings and seals follow the
procedure as described for the gear end, page 20.
