Maintenance
Procedures
(continued)
10
CAUTION: Do not use oils containing detergents for
bearing lubrication. Detergent oils will remove the
graphite in the bearing sleeve and cause bearing fail-
ure. Also, do not disturb bearing alignment by tight-
ening bearing cap adjustment on a new unit as they
are torque adjusted at the factory.
FAN MOTOR BEARINGS
All Totally Enclosed Fan Cooled (TEFC) Fan Motors have
regreaseable bearings. The motor bearings should be
lubricated as recommended in the motor manufacturer’s
operating instructions that are attached to the motor when
the equipment ships from the factory.
LOCKING COLLARS
Each eccentric locking collar should be checked
every six months to ensure that the inner bearing
race is secured to the fan shaft. The locking collar can
be set using the following procedure (see Figure 4):
1. Loosen the set screw.
2. Using a drift pin or centerpunch, tap the collar (in the
hole provided) tangentially in the direction of rotation
while holding the shaft.
3. Retighten the set screw.
ADJUSTABLE MOTOR BASE:
The motor base slides and adjusting screw (See Figure 5)
should be coated twice a year using a good quality corro-
sion inhibiting grease such as one of those recommended
for lubricating the fan shaft bearings (see Page 9).
TEMP AMBIENT
70°F to 110°F
30°F to 70°F
5°F to 30°F
-25°F to 5°F
OIL CUP
Figure 3 – Sleeve Bearing
TABLE 3. Sleeve Bearing Lubricants
B.A.C. P/N
TEXACO
EXXON
#582628PI
#582627PI
Regal R & O 320
Regal R & O 150
Regal R & O 32
Capella 32
Teresstic 220
Teresstic 100
Teresstic 32
DRIFT
PIN
(A) TAP THE LOCKING COLLAR
IN DIRECTION OF FAN ROTATION
(B) TIGHTEN SET SCREW
AFTER CAM IS LOCKED
DIRECTION
OF ROTATION
Figure 4 – Locking Collar Assembly
ADJUSTING
NUT
LOCK NUT
ADJUSTING SCREW
Figure 5 – Adjustable Motor Base
VTO, VT1, VTL, VF1, VFL, VC1, VCL
ADJUSTABLE MOTOR BASE:
The motor base hangers, hinges, and adjusting screw
(See Figure 5A and 5B) should be coated twice a year
using a good quality corrosion inhibiting grease such as
one of those recommended for lubricating the fan shaft
bearings (see Page 9).
MOTOR
BASE
HANGERS
ADJUSTING
SCREW
Figure 5A – Adjustable Motor Base
VC2-N138-N446
