Installation, Operation & Maintenance Manual
IM-166
10
Bearing Installation
(refer to safety section)
The following section gives some general instructions on bearing installation. If bearings are to be field installed, the specific
installation manual for the bearings will be provided and should be followed carefully. If provided, check the assembly drawings
and bearing manufacturer's instructions for location of the fixed and expansion bearings. The positions of these bearings cannot be
interchanged. Always follow the bearing manufacturer's instructions.
Solid Pillow Block
1. Lightly lubricate the bearing bore and slide bearing into the proper position on the shaft.
Sling the rotor assembly into place and loosely bolt the bearings in place.
2. When bearings are in place, shim appropriately and torque the base bolts using
values from the Tightening Torque table on page 9. Tighten the collar set screws to
manufacturer’s specification. The set screws on both bearings should be aligned with one
another. If the bearing has an adapter mount, hand tighten the locknut to establish the
“zero” point. Next, tighten the number of turns per the instructions furnished with the
bearing. Rotate by hand to be sure the bearings and shaft rotate freely.
3. Ensure the expansion bearing is centered within its housing. If bearings need to forced
onto the shaft then apply force on the inner race/collar only (does not apply to adapter
mount.) If an expansion bearing has been supplied, it should not be bolted to the pedestal
until the fixed bearing has been bolted and locked. After locking the expansion bearing to
the shaft, position the pillow block to allow for axial expansion, approximately centered
in the pillow block, then bolt to the pedestal.
4.
Unless the user orders differently, bearings are lubricated in the factory with a lithium complex, NLGI grade 2 grease.
Refer to the
bearing lubrication schedule on the next page.
Spherical Roller Bearings with Split Pillow Block Housings
1. The bearings should be disassembled, taking care not to interchange parts between
bearings. Tops of housings are not interchangeable with the bottom half pillow block
from another bearing. Pins locate the top half of the housing to prevent it from being
installed in the reverse.
2. The lower bearing housing should be bolted loosely to the pedestal and seals; bearing
and adapter sleeve should be placed loosely on the shaft.
3. The rotor assembly with the seals and bearings should next be positioned over the
housings and carefully placed into the lower housings.
4. The stabilizing ring, sometimes referred to as the “C” ring, is installed in the bearing
closest to the drive sheave or coupling unless otherwise noted in the drawing. The
bearing race should be centered in the expansion bearing. The exception may be on
Arrangement 3 or 7 fans with a high operating temperature. Refer to the fan drawing for
location. The “C” ring is not used in the expansion bearing.
5. When installing adapter sleeves, tighten for reduction in clearance per manufacturer’s instructions.
6. Bend down a tab on the lockwasher after finishing adjustment. Some brands of bearings do not utilize a lockwasher. Instead you
will find allen-head set screws in the locknut outside diameter. Tighten the set screw after reduction in clearance is attained.
7.
Grease or oil according to manufacturer’s instructions. Grease/lube will likely include the partial fill of the housing internal cavities.
8. Install the bearing housing cap bolts and bearing mounting bolts. Tighten bearing housing cap bolts and bearing mounting bolts.
Torque to bearing manufacturer's instructions.
Split Pillow Block Bearings
Solid Pillow Block Bearings
