Trane QFNA-IOM-1 - Manual (Page 27)

Link-Belt Series 6800 Spherical
Roller Bearing Pillow Blocks
1. Use jack screws in the dowel
pin 6 holes to disassemble
base and cap. Do not use a pry
or wedge at the split time.
2. Bolt base to bearing supports,
square with the shaft. Draw up
base mounting bolts snugly but
not to final tightness.
3. Shaft must be clean and free of
burrs and nicks. Apply mixture
of white lead and oil to shaft,
outside of diameter and
threads of tapered sleeve and
face of lock nut.
4. Slide steel rings, bearing,
adapter and accessory parts
on the shaft in the correct
order. See Figure 15. The
bearing is to be set up as a
fixed bearing on the drive
5. Set the bearing and sleeve
snugly on the shaft at the
position of the bearing support.
The bearing is to be placed
with the bearing face opposite
the lock nut against the bearing
housing shoulder. The lock nut
is on the sheave side bearing.
In placing this bearing, take
into account that tightening
correctly will move the bearing
further up the tapered sleeve.
Do not tighten lock nut beyond
finger tight at this time.
6. The shaft with bearing
assembly may be lowered into
housing. Lower slowly and
position bearings and seals to
engage bearing housing base.
If bearing outer rings become
misaligned, do not force back
into position instead, carefully
work back by turning and
sliding
7. Bearings must be mounted to
achieve the required clearance
removal.
a. Measure the initial built-in
bearing clearance across the
top rollers and outer ring
raceway as shown in Figure
16. A snug feel is
recommended. It must be
possible to remove the shim by
pulling it straight out.
b. Tighten the lock nut forcing the
bearing up the tapered OD of
the sleeve until the bearing
measured clearance is
reduced by the amount shown
in Table 12.
8. The proper method of
tightening is shown in Figures
17 and 18. Using a spanner
wrench, tighten the lock nut
until snug. Hold the adapter
sleeve from turning until seated
firmly. Using a brass bar and
hammer, drive the face of the
locknut as shown to relieve the
thread pressure. Retighten the
lock nut and repeat until the
correct adjustment specified in
Step 7 is obtained.
9.
Bend a tang of the lock washer
down into one of the lock nut
slots. Use the slot which is
most nearly lined up with the
tang. Insert “C” spacer in fixed
bearing housing, on the lock
nut side.
10.Lubricate before operation by
packing the bearing full and
filling the reservoir on both
sides of the bearing up to the
bottom of the shaft. Grease
should be forced in one side of
the bearing until it comes out
the other side all the way
around. Grease recom-
mendations are given in the
“Maintenance” section. See
Table 9.
11.Apply non-hardening gasket
compound to cap surfaces
which contact the base.
Tighten cap nuts or bolts
securely.
12.With the mounting bolts snug,
check alignment and freedom
of rotation. The housing or
shaft clearance with the seals
is small and can be checked
visually for uniformity all the
way around. Align by shimming
or shifting as necessary. Use
large area shims to avoid
distorting the housing and
pinching the bearing. Finally,
tighten mounting bolts
securely. See Table 13 for
torques.
QFNA-IOM-1 27
Bearing Service
Table 12 - Bearing Clearance Reduction on Link-Belt 6800 Series Bearings
Pillow Block
Range
Bore Size
(Inches)
Reduction of Clearance
(Inches)
Min. Max.
6823 - 6828 1-7/16 - 1-3/4 0.0010 0.0015
6829 - 6844 1-13/16 - 2-3/4 0.0010 0.0020
6845 - 6868 2-13/16 - 4-1/4 0.0015 0.0025
6869 - 6892 4-5/16 - 5-3/4 0.0020 0.0030
6893 - 68104 5-13/16 - 6-1/2 0.0025 0.0035