Installation, Operation & Maintenance Manual
IM-995
13
Safety & Bearing Lubrication Instructions
*Suggested lubrication interval under continuous operation in adverse loading or with
elevated temperatures. For operation less than 24 hours per day or under ideal conditions,
lubrication frequency may be reduced. Relubricate while running, if safety permits, until
some purging occurs at seals. Adjust lubrication frequency depending on condition of
purged grease. Hours of operation, temperature and surrounding conditions will affect the
relubrication frequency required.
1. Lubricate with a high quality NLGI No. 2 lithium-base grease having rust inhibitors and
greases having these properties are:
2. Lubricate bearings prior to extended shutdown or storage and rotate shaft monthly
to aid corrosion protection.
3. Any lubrication requirements noted on the general assembly drawing supersede
requirements found here.
Fans with Unit Roller Bearings
Relubrication Schedule (Weeks)*
Spherical Roller Bearing - Solid Pillow Blocks
Shaft DIA
Speed (RPM)
500 1000 1500 2000 2500 3000 3500 4000 4500
1
⁄2" thru 1
7
⁄16"
(13 – 35)
6 4 4 2 1 1 1 1 0.5
1
11
⁄16" thru 2
3
⁄16"
(40 – 55)
4 2 1.5 1 0.5 0.5 0.5 0.5 0.5
2
7
⁄16" thru 3
7
⁄16"
(60 – 85)
3 1.5 1 0.5 0.5 0.25 0.5 – –
3
15
⁄16" thru 4
15
⁄16"
(100 – 125)
2.5 1 0.5 0.25 – – – – –
*Suggested lubrication interval under continuous operation in adverse loading or with
elevated temperatures. For operation less than 24 hours per day or under ideal conditions,
lubrication frequency may be reduced. Relubricate while running, if safety permits, until
some purging occurs at seals. Adjust lubrication frequency depending on condition of
purged grease. Hours of operation, temperature and surrounding conditions will affect the
relubrication frequency required.
1. Lubricate with a high quality NLGI No. 2 lithium-base grease having rust inhibitors and
greases having these properties are:
2. Lubricate bearings prior to extended shutdown or storage and rotate shaft monthly to
aid corrosion protection.
3. Any lubrication requirements noted on the general assembly drawing supersede
requirements found here.
Fans with Ball Bearings
Relubrication Schedule (Weeks)*
Ball Bearing Pillow Blocks
Shaft DIA
Speed (RPM)
500 1000 1500 2000 2500 3000 3500 4000 4500
1
⁄2" thru 1
11
⁄16"
(13 – 45)
6 6 5 3 3 2 2 2 1
1
15
⁄16" thru 2
7
⁄16"
(50 – 60)
6 5 4 2 2 1 1 1 1
2
11
⁄16" thru 2
15
⁄16"
(65 – 75)
5 4 3 2 1 1 1 – –
3
7
⁄16" thru 3
15
⁄16"
(90 – 100)
4 3 2 1 1 – – – –
*Suggested lubrication interval under continuous operation in adverse loading or
with elevated temperatures. For operation less than 24 hours per day or under ideal
conditions, lubrication frequency may be reduced. Relubricate while running, if safety
permits, until some purging occurs at seals. Adjust lubrication frequency depending on
condition of purged grease. Hours of operation, temperature and surrounding conditions
will affect the relubrication frequency required.
1. Lubricate with a high quality NLGI No. 2 lithium-base grease having rust inhibitors
Some greases having these properties are:
2. Lubricate bearings prior to extended shutdown or storage and rotate shaft monthly
to aid corrosion protection.
3. Purge or remove old grease when changing lubrication brands or types.
4. Any lubrication requirements noted on the general assembly drawing supersede
requirements found here.
Static Oil Lubrication
1. Use only high quality mineral oil with a VG grade indicated on the customer
submittal drawing.
3. Complete lubrication change should be made annually.
Fans with Spherical Roller Bearings
with Split Pillow Block Housings
Relubrication Schedule (Weeks)*
Spherical Roller Bearing - Split Pillow Blocks
Grease to
be added
at each
interval
Shaft DIA
Speed (RPM)
500 750 1000 1500 2000 2500 3000 3500 4000
1
7
⁄16" thru 1
15
⁄16"
(35 – 50)
6 4.5 4 4 3.5 2.5 2
1
.5 1 1 0.50 oz.
2
3
⁄16" thru 2
13
⁄16"
(55 – 70)
5 4.5 4 2.5 2.5 1.5 0.5 0.25 0.25 0.75 oz.
2
15
⁄16" thru 3
15
⁄16"
(75 – 100)
4.5 4 3.5 2.5 1.5 1 0.5 – – 2.00 oz.
4
7
⁄16" thru 4
15
⁄16"
(110 – 125)
4 4 2.5 1 0.5 – – – – 4.00 oz.
5
7
⁄16" thru 6
15
⁄16"
(140 – 180)
4 2.5 1.5 – – – – – – 8.5 oz.
WARNING
1. This equipment must not be operated without proper guarding of all moving parts. While performing maintenance be sure remote
power switches are locked off. See AMCA Publication 410 for recommended safety practices.
2. Before starting: Check all set screws for tightness and rotate impeller by hand to make sure it has not moved in transit.
Twin City Fan
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