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Recommended Torque for Setscrews/Bolts (IN-LB)
Setscrews
Recommended
Key Hex
Torque
Size
Across
Flats
Min.
#8
5/64"
15
#10
3/32"
27
1/4
1/8"
70
5/16
5/32"
140
3/8
3/16"
250
7/16
7/32"
355
1/2
1/4"
560
5/8
5/16"
1120
3/4
3/8"
1680
7/8
1/2"
4200
1
9/16"
5600
NOTICE! If a problem is discovered, immediately
shut off the fan. Lock out all electrical power
and check for the cause of the trouble. Refer to
Troubleshooting.
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory op-
eration. During the inspections, stop the fan and inspect
as per the Conditions Chart.
30 Minute Interval
Inspect bolts, setscrews and motor mounting bolts. Ad-
just and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten
as necessary.
24 Hour Interval
Inspect belt tension, bolts, setscrews and motor mount-
ing bolts. Adjust and tighten as necessary.
Maintenance
Establish a schedule for inspecting all parts of the fan.
The frequency of inspection depends on the operating
conditions and location of the fan.
Inspect fans exhausting corrosive or contaminated air
within the first month of operation. Fans exhausting con-
taminated air (airborne abrasives) should be inspected ev-
ery three months.
Regular inspections are recommended for fans exhaust-
ing non-contaminated air.
It is recommended the following inspections be con-
ducted twice per year:
• Inspect bolts and setscrews for tightness. Tighten as neces-
sary. Worn setscrews should be replaced immediately
• Inspect belt wear and alignment. Replace worn belts with new
belts and adjust alignment as needed. Refer to Belt and Pulley
Installation
• Bearings should be inspected as recommended in the Condi-
tions Chart
• Inspect variable inlet vanes for freedom of operation and ex-
cessive wear. The vane position should agree with the position
of the control arm. As the variable inlet vanes close, the enter-
ing air should spin in the same direction as the wheel
• Inspect isolation base for freedom of movement
• Inspect springs and rubber isolators for deterioration and re-
place as needed
• Inspect for cleanliness. Clean exterior surfaces only. Remov-
ing dust and grease on motor housing assures proper motor
cooling. Removing dirt from the wheel and housing prevent
imbalance and damage
PLC IO&M
Hold Down Bolts
Recommended
Size
Torque
Max.
21
3/8"-16
324
33
1/2"-13
780
80
5/8"-11
1440
160
3/4"-10
2400
290
7/8"-9
1920
405
1"-8
2700
640
1-1/8"-7
4200
1280
1-1/4"-7
6000
1920
-
-
4800
-
-
6400
-
-
Lubrication
Fan Bearings
Greasable fan bearings are lubricated through a grease
fitting on the bearing and should be lubricated by the
schedule, Lubrication Conditions Chart.
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can burst
seals thus reducing bearing life.
Before lubricating, the grease nipple and immediate
vicinity should be thoroughly cleaned without the use of
high pressure equipment. The grease should be supplied
slowly as the bearing rotates until fresh grease slips past
the seal. Excessive pressure should be avoided to prevent
seal damage.
Lubrication Conditions Chart
Fan Class
Fan Status
Normal Conditions
Centrifugal
(clean, dry & smooth)
Blower
Extreme Conditions
Class I
(dirty/wet/rough)
Normal Conditions
Centrifugal
(clean, dry & smooth)
Blower
Extreme Conditions
Class II
(dirty/wet/rough)
Normal Conditions
Centrifugal
(clean, dry & smooth)
Blower
Extreme Conditions
Class III
(dirty/wet/rough)
In the event the bearing cannot be seen, use no more
than three injections with a hand-operated grease gun.
Exceptions to the greasing interval chart:
• Periodic Applications (any break of one week or
more): it is recommended that full lubrication be per-
formed prior to each break in operation.
• Higher Temperature: it is recommended to halve the
intervals for every 30°F increase in operating tempera-
ture above 120°F not to exceed 230°F for standard bear-
ings; high temperature bearings (optional) can operate
up to 400°F.
• Vertical Shaft: it is recommended that the intervals
should be halved.
Loren Cook Company uses petroleum lubricant in a lithi-
um base. Other types of grease should not be used unless
the bearings and lines have been flushed clean. If another
type of grease is used, it should be a lithium-based grease
conforming to NLGI grade 2 consistency.
An NLGI grade 2 grease is a light viscosity, low-torque,
rust-inhibiting lubricant that is water resistant. Its tempera-
ture range is from -30°F to +200°F and capable of intermit-
tent highs of +250°F.
Motor Bearings
Motors are provided with prelubricated bearings. Any lu-
brication instructions shown on the motor nameplate su-
persede the following instructions.
Motor bearings without provisions for relubrication will op-
erate up to 10 years under normal conditions with no mainte-
nance. In severe applications, high temperatures or exces-
sive contaminates, it is advisable to have the maintenance
department disassemble and lubricate the bearings after
three years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow inter-
vals of the following table.
5
Maximum Interval
Shaft Size
(operation hrs)
>1-1/2"
10,000
<1-1/2"
2,000
>1-1/2"
2,000
<1-1/2"
400
>2"
7,500
<2"
1,000
>2"
1,500
<2"
200
>2"
3,000
<2"
500
>2"
500
<2"
100
B51023-002
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