Sleeve Bearings - Carrier 17 Start Up & Operation Manual

Wiping — Surface contamination on the winding can be re-
moved by wiping, using a soft, lint-free wiping material. If
the contamination is oily, the wiping material can be moist-
ened (not dripping wet) with a safety-type petroleum sol-
vent, such as Stoddard solvent. In hazardous locations, a solvent
such as inhibited methyl chloroform may be used, but must
be used sparingly and immediately removed. While this sol-
vent is non-flammable under ordinary conditions, it is toxic
and proper health and safety precautions should be followed
while using it.
Solvents of any type should never be used on windings
provided with abrasion protection. Abrasion protection is a
grey, rubber-like coating applied to the winding end-turns.
Adequate ventilation must always be provided in any
area where solvents are being used to avoid the danger
of fire, explosion or health hazards. In confined areas
(such as pits) each operator should be provided with an
air line respirator, a hose mask or a self-contained breath-
ing apparatus. Operators should wear goggles, aprons
and suitable gloves. Solvents and their vapors should
never be exposed to open flames or sparks and should
always be stored in approved safety containers.

SLEEVE BEARINGS

Oil Changing — The oil reservoirs of the self lubricated bear-
ings should be drained and refilled every 6 months. More
frequent changes may be needed if severe oil discoloration
or contamination occurs. In conditions where contamination
does occur, it may be advisable to flush the reservoir with
kerosene to remove any sediment before new oil is added.
Proper care must be taken to thoroughly drain the reservoir
of the flushing material before refilling with the new oil.
Refill the reservoir to the center of the oil sight glass with
a rust and oxidation inhibited, turbine grade oil. The viscos-
ity of the oil must be 32 ISO (150 SSU) at 100 F (37.7 C).
Oil capacity in each of the 2 bearings is 0.6 gal. (2 l) per
bearing. Use of Carrier Oil Specification PP16-0 is ap-
proved (Mobil DTE Light or Sun Oil SUNVIS 916).
Disassembly — The bearing sleeve is of the spherically seated,
self-aligning type. The opposite drive end bearing is nor-
mally insulated for larger motors (or when specified). On
some motors, the insulation is bonded to the spherical seat
of the bearing housing. Use extreme care when removing
the sleeve from the insulated support to avoid damaging this
insulation.
Note that some bolts and tapped holes associated with the
bearing housings, bearing sleeves, and seals are metric.
The following is the recommended procedure for remov-
ing the bearing sleeve:
1. Remove the oil drain plug in the housing bottom and
drain the oil sump.
2. Remove all instrumentation sensors that are in contact
with the bearing sleeve. These would include resistance
temperature detectors, thermocouples, temperature re-
lay bulbs, thermometers, etc.
3. Remove the end cover.
4. Remove the socket head bolts holding the bearing cap
and the inner air seal together at the horizontal split. The
front end cover plate must also be removed if the front
bearing is being disassembled. Remove the bearing cap
and top half of the inner air seal by lifting straight up to
avoid damaging the labyrinth seals. Place them on a clean,
dry surface to avoid damage to the parting surfaces.
5. Remove any split bolts that may be holding the two bear-
ing halves together. Remove the top half of the bearing
sleeve using suitable eye-bolts in the tapped holes pro-
vided. Lift the bearing top straight up and avoid any con-
tact with the shoulders of the shaft journals that might
damage the thrust faces of the bearing. Place on a clean,
dry surface taking care to prevent damage to either the
parting surfaces or the locating pins that are captive in
the top bearing half.
6. Remove the 4 screws at the partings in the oil ring and
dismantle the ring by gently tapping the dowel pin ends
with a soft face mallet. Remove the ring halves and im-
mediately reassemble them to avoid any mix up in parts
or damage to the surfaces at the partings.
7. When removing the labyrinth seals, make note of the
position of the anti-rotation button located on the inside
of the top half of the seal. Pull up the garter spring sur-
rounding the floating labyrinth seal and carefully slip
out the top half. Rotate the garter spring until the lock
is visible. Twist counterclockwise to disengage the lock,
remove the garter spring, then rotate the lower half of
the seal out of the groove in the bearing housing while
noting the orientation of the oil drain holes. Note the
condition of these floating labyrinth seals. If they are
cracked or chipped, they must be replaced. Do not at-
tempt to reuse a damaged seal.
8. To remove the bottom bearing half, the shaft must be
raised a slight amount to relieve pressure on the bear-
ing. On the rear end, this can be done by jacking or lift-
ing on the shaft extension. (Care must be taken to pro-
tect the shaft from damage). On the front end, jacking
or lifting can be done using bolts threaded into the tapped
holes provided in the shaft end.
NOTE: Lift only enough to free the bearing; overlifting
the shaft can cause difficulty in removal of the bearing.
9. Roll the bottom bearing half to the top of the shaft jour-
nal and then lift it using suitable eyebolts threaded into
the holes provided. Again avoid any contact with the
shaft shoulders that could damage the bearing thrust faces.
Place the lower bearing half on a clean, dry surface to
protect the parting surfaces.
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