7
Table 1 — Ball Bearing Lubrication Schedule
Table 2 — Spherical Roller Bearing Lubrication Schedule
RECOMMENDED GREASE
• NGLI (National Lubricating Grease Institute) no. 2, lith-
ium-based
• Water resistant –20 F to 200 F
Examples are listed below.
Every Six Months
1. Check fans for condition and tension of belts. Replace
cracked, frayed or glazed belt. Re-verify tension after
48 hours and re-tension if required. See the section Belt
Tensioning Method below. Do not over-tighten belts or
bearing damage can occur. Belt should depress its width
when pressed firmly inward at midpoint between pulleys
and should tighten enough to prevent slipping. If motor
pulley shoulder is worn, replace that as well.
2. Check fan and motor bearings for binding, noise, or ex-
cessive heat.
3. Check fan wheels for dirt, debris, or grease accumulation.
Clean if required. Do not use caustic or abrasive cleaners
on fan shaft.
BELT TENSIONING METHOD —
When installing or re-
placing belts, always
use a complete set of new belts.
Mixing
old and new belts will result in the premature wear or breakage
of the newer belts.
Refer to label on inside of fan access door for information
on factory-supplied drive.
1. Always adjust the motor position so that V-belts can be
installed without stretching over grooves. Forcing belts
can result in uneven stretching and a mismatched set of
belts.
2. Do not allow belt to bottom out in sheave.
3. Tighten belts by turning motor-adjusting jackscrews.
Turn each jackscrew an equal number of turns.
4. Equalize belt slack so that it is on the same side of belt for
all belts. Failure to do so may result in uneven belt
stretching.
5. Tension new drives at the maximum deflection force
recommended (Table 3).
On current production, the correct tension information is
listed on the fan drive label. For older equipment or units
SHAFT
DIAMETER
(INCHES)
APPROX.
GREASE
CAPACITY
(OUNCES)
FAN SPEED (RPM)
500
1000
1500
2000
2500
3000
3500
0.50 to 1.69
1
/
2
6 mos.
6 mos.
5 mos.
3 mos.
3 mos.
2 mos.
2 mos.
1.94 to 2.44
3
/
4
6 mos.
5 mos.
4 mos.
2 mos.
2 mos.
1 mo.
1 mo.
2.56 to 2.94
1
1
/
2
5 mos.
4 mos.
3 mos.
2 mos.
1 mo.
1 mo.
1 mo.
3.44 to 3.94
3
4 mos.
3 mos.
2 mos.
1 mo.
1 mo.
1 mo.
—
STUD
NUT
SHOULDER
WASHER
TUBE ½ IN.
WIRE
TUBE
STUD
NUT
SHOULDER
WASHER
NUTS
SHOULDER
WASHER
TUBE
STUB
SHIPPING POSITION
SIDE VIEW
OPERATING POSITION
SIDE VIEW
EXPANDED
ASSEMBLY VIEW
a39-4469
Fig. 10 — Fan Assembly
SHAFT
DIAMETER
(INCHES)
APPROX.
GREASE
CAPACITY
(OUNCES)
FAN SPEED (RPM)
500
750
1000
1500
2000
2500
1.44 to 1.94
1
/
2
6 mos.
4.5 mos.
4 mos.
4 mos.
3.5 mos.
2.5 mos.
2.19 to 2.69
3
/
4
5 mos.
4.5 mos.
4 mos.
2.5 mos.
2.5 mos.
1.5 mos.
2.94 to 3.94
2
4.5 mos.
4 mos.
3.5 mos.
2.5 mos.
1.5 mos.
—
4.44 to 4.94
4
4 mos.
4 mos.
2.5 mos.
1 mo.
—
—
5.44 to 5.94
7
4 mos.
2.5 mos.
1.5 mos.
—
—
—
BRAND
TYPE
Shell
Alvania #2
Mobile
Mobilux #2
Gulf
GulfCrown #2
Keystone
81-EP-2
Texaco
Premium RB2
Exxon
Unirex #2
