Trane QFNA-IOM-1 - Manual (Page 25)

About Bearings
The bearings for the Model Q
Fans are carefully selected to
match the maximum load and
operating conditions of the fan.
Following the instructions in this
manual will minimize any bearing
problem. All fans shipped with
bearings pre- lubricated and
installed. The grease lines are
also filled at the factory.
Since bearings may have to be
adjusted or removed, the following
general instructions and setscrew
torques are provided. See Table
10.
Sealmaster SFT, MSF, SF
and MSFT Bearings
See Figures 12 and 13.
1. Shaft must be clean and free
from nicks and burrs. The
bearing bore is ground for a
sliding fit over the shaft.
2. Lubricate the shaft and make
certain the setscrews are clear
of the bore.
3. Slide bearing onto shaft - never
hammer the ends of the inner
race. Setscrews (2) should be
toward end of shaft. If nec-
essary to apply force use a brass
bar against the inner race only to
drift bearing into place.
4. Bolt flanged housing to support
and check freedom of rotation.
See Table 10 for torques.
5. Tighten self-locking cup point
setscrews securely onto the
shaft. See Table 10 for torques.
QFNA-IOM-1 25
Bearing Service
Table 10 - Torques for Tightening Setscrews on Sealmaster SFT, MSFT, SF and MSF Bearings
Bearing Bore
SFT MSFT MSF SF Setscrew
Diameter
Hex Size
Across Flats
Recommended
Torque
Foot Lbs.
15-16 to 1-3/16 1-3/16 to 1-1/2 1/4 1/8 5.5
1-1/4 to 1-3/4 1-3/16 to 1-1/2 1-11/16 to 2 1-13/16 to 2-7/16 5/16 5/32 10.5
1-13/15 to 1-15//16 1-11/16 to 2 2-7/16 to 3-1/4 2-1/2 to 2-15/16 3/8 3/16 19.0
3-7/16 to 3-1/2 7/16 7/32 29.0
1/2 1/4 42.0
Figure 12—Sealmaster Bearing, SFT
Series Figure 13—Sealmaster Bearing, MSF
Series