Page 1
WARNING
This unit has rotating parts. Safety precautions
should be exercised at all times during installation,
operation, and maintenance.
ALWAYS disconnect power prior to working on fan.
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation
and maintenance instructions for standard units of the
IMH - Industrial Material Handler. Carefully read this
publication prior to any installation or maintenance
procedure.
Loren Cook catalog, IMH, provides additional information
describing the equipment, fan performance, available
accessories, and specification data.
For additional safety information, refer to AMCA publication 410-96, Safety Practices for Users and Installers of
Industrial and Commercial Fans.
All of the publications listed above can be obtained from
Loren Cook Company by phoning 417/869-6474, extension
166; by FAX at 417/832-9431; or by e-mail at info@lorencook.com.
For information on special equipment, contact Loren
Cook Company Customer Service Department at 417/869-
6474.
Receiving and Inspection
Carefully inspect the fan and accessories for any damage and shortage immediately upon receipt of the fan.
• Turn the wheel by hand to ensure it turns freely and
does not bind.
• Inspect dampers (if supplied) for free operation of all
moving parts.
• Record on the Delivery Receipt any visible sign of
damage.
Handling
Lift the fan by the base or lifting eyes. Never lift by the
shaft, motor, or housing.
Storage
If the fan is stored for any length of time prior to installation, completely fill the bearings with grease or moistureinhibiting oil (refer to Lubricants on page 6). Also, store the
fan in its original crate and protect it from dust, debris and
the weather.
Outdoor Storage
To maintain good working condition of the fan when it is
stored outdoors, follow the additional instructions below.
• Coat the shaft with grease or a rust preventative compound.
• Wrap bearings for weather protection
• Cover the inlet and outlet of the fan to prevent the accumulation of dirt and moisture in the housing.
• Periodically rotate the wheel and operate dampers (if
supplied).
• Periodically inspect the unit to prevent damaging conditions.
IMH
Industrial Material Handler
Installation
Most motors are shipped mounted on the fans with belts
and drives installed. However, extremely heavy motors and
drives are shipped separately. These motors and drives will
require field installation. Please refer to pages 3-5.
Foundation
This fan requires a strong, level foundation of reinforced
poured concrete. A correctly designed concrete foundation
provides the best means for mounting floor units. The foundation’s size is determined by fan size , moto r si ze and po sition, and the specific location of the installation.
Use the following guidelines to calculate foundation size:
• The overall dimensions of the foundation should extend
at least 6 inches beyond the outline of the fan and its
motor.
• The weight of the foundation should be 2 to 3 times the
weight of the unit and its motor.
Isolation
Isolation Base
To prevent vibration and noise from being transferred to
the building isolators are recommended. Arrangement 1
fans require an isolation base to effectively isolate the fan
system: fan, base, motor, drive, guards, etc. Bases must
have sufficient rigidity to resist belt pull and prevent drive
distortion which can lead to excessive belt and bearing
IMH
Page 2
Figure 2 -Floor Mount Isolators
Rubber-In-Shear Isolator
Spring Isolator
Non-ducted Inlet Clearance
MIN 1 DIA
Correct
Incorrect
Free Discharge
Correct
Incorrect
Inlet Duct Turns
MIN 3
DIA
distortion which can lead to excessive belt and bearing
Note
Although a certain amount of vibration is inhe rent in
operating centrifugal fans, extreme vibration is a serious problem that may cause structural and mechanical failure.
Ceiling Mounted Spring Isolator Rubber-in-Shear Ceiling Isolator
Figure 1- Ceiling Mount Isolators
wear; its perimeter should contain all base angles and
rotating parts. Arrangement 10 fans above size 270 require
isolation rails. Please consult factory for isolation of
arrangement 9 fans due to the potential of uneven loading
caused by the motor and drives. Isolators should be
located between the fan system and the support structure.
Ceiling Mounted Isolators
Some applications require fan systems, designed for
floor mounting, suspended from ceiling supports. In such
cases, IMH fans of all arrangements should be installed on
either rails or bases in the classical orientation. Typically,
these systems are hung from the corners by rods, which
include isolation hangers of either spring or rubber-in-shear
design. Under no circumstances is the fan to be
inverted and hung by its base angles.
Duct Installation
Efficient fan performance relies on the proper installation
of inlet and discharge ducts. Be sure your fan conforms to
the guidelines below.
Non-Ducted Inlet Clearance
If your fan has an open inlet (no duct work), the fan must
be placed 1 fan wheel diameter away from walls and bulkheads. An inlet bell should be used in this case.
Floor Mounted Spring Isolators
a. Mount fan and motor on isolation base (if supplied).
b. Elevate fan (or isolation base) to operating he ight and
insert blocks to hold in position.
c. Position isolators under the fan (or isolation base) and
vertically align by inserting leveling bolt through
mounting holes in the fan or the base. The isolator
must be installed on a level surface.
d. Adjust the isolators by turning the leveling nut counter
clockwise several turns at a time alternately on each
isolator until the fan weight is transferred onto the isolators and the fan raises uniformly off the blocks. Then
remove the blocks.
e. Turn lock nut onto leveling bolt and secure firmly in
place against the top of the mounting flange or frame.
f. Secure isolators to mounting surface.
Floor Mounted Rubber-In-Shear (RIS) Isolators
a. Mount fan and motor on an isolation base (if supplied).
b. Elevate fan to provide room to insert isolators
between the fan and foundation and block in position.
c. Position isolators under fan and secure bolts.
d. Remove blocks and allow fan to rest on floor . Isolators
must be installed on a level surface (leveling should
not be required).
e. Secure isolators to mounting surface.
Free Discharge
Avoid a free discharge into the plenum. This will result in
lost efficiency because it doesn’t allow for a static regain.
Inlet Duct Turns
For ducted inlets, allow at least 3 fan wheel diameters
between duct turns or elbows and the fan inlet.
Discharge Duct Turns
Make sure that duct turns located near the fan discharge
curve in the direction of the fan’s rotation. Refer to the Discharge Duct Turns illustration on page 3.
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Page 3
Wheel-to-Inlet Clearance
Correct
Incorrect
Discharge Duct Turns
MIN 3
DIA
Wheel-to-Inlet Clearance and Overlap
Size
MH, MHBM MHR MHA
Wheel to Inlet
Ring Clearance
Wheel to Inlet
Ring Overlap
Min. Max. Min. Max.
70 3/16 5/16 1/8 1/4
90 3/16 5/16 1/8 1/4
110 3/16 5/16 3/16 5/16
130 3/16 5/16 1/4 3/8
150 3/16 5/16 1/4 3/8
170 3/16 5/16 5/16 7/16
190 3/16 5/16 3/8 1/2
210 5/16 7/16 7/16 9/16
230 5/16 7/16 7/16 9/16
260 5/16 7/16 1/2 5/8
290 5/16 7/16 5/8 3/4
Personal Safety
Disconnect switches are recommended. Place the
disconnect switch near the fan in order that the
power can be swiftly cut off in case of an
emergency, and in order that maintenance
personnel are provided complete control of the
power source.
1 foot
1/4 inch
Figure 3
The correct wheel-to-inlet clearance is critical to proper
fan performance. This clearance should be verified before
initial start-up since rough handling during shipment could
cause a shift in fan components. Refer to wheel/inlet drawing below for correct clearance.
Adjust the overlap by loosening the wheel hub and moving the wheel along the shaft to obtain the correct value.
WHEEL TO INLET
CLEARANCE
MH, MHB, MHR
always identify a closed switch to promote safety (i.e.,
red tape over a closed switch).
Wheel Rotation
Test the fan to ensure the rotation of the wheel is the
same as indicated by the arrow marked Rotation.
115 and 230 Single Phase Motors
Fan wheel rotation is set correctly at the factory. Changing the rotation of this type of motor should only be
attempted by a qualified electrician.
208, 230, and 460, 3 Phase Motors
These motors are electrically reversible by switching two
of the supply leads. For this reason, the rotation of the fan
cannot be restricted to one direction at the factory. See
Wiring Diagrams on page 4 for specific information on
reversing wheel direction.
Do not allow the fan to run in the wrong direction. This
will overheat the motor and cause serious damage . For
3-phase motors, if the fan is running in the wrong
direction, check the control switch. It is possible to
interchange two leads at this location so that the fan is
operating in the correct direction.
MHA
WHEEL TO INLET
OVERLAP
Wiring Installation
All wiring should be in accordance with local ordinances
and the National Electrical Code, NFPA 70. Ensure the
power supply (voltage, frequency, and current carrying
capacity of wires) is in accordance with the motor nameplate.
Lock off all power sources before unit is wired to
power source.
Leave enough slack in the wiring to allow for motor
movement when adjusting belt tension. Some fractional
motors have to be removed in order to make the connection with the terminal box at the end of the motor. To
remove motor, remove bolts securing motor base to power
assembly. Do not remove motor mounting bolts.
Follow the wiring diagram in the disconnect switch
and the wiring diagram provided with the motor. Correctly label the circuit on the main power box and
Belt and Pulley Installation
Belt tension is determined by the sound the belts make
when the fan is first started. Belts will produce a loud
squeal which dissipates after the fan is operating at full
capacity. If the belt tension is too tight or too loose, lost efficiency and possible damage can occur.
Do not change the pulley pitch diameter to change tension. This will result in a different fan speed than desired.
a. Loosen motor plate adjustment nuts and move motor
plate in order that the belts can easily slip into the
grooves on the pulleys. Never pry, roll, or force the
belts over the rim of the pulley.
b. Adjust the motor plate until proper tension is reached.
For proper tension, a deflection of approximately 1/4”
per foot of center distance should be obtained by
firmly pressing the belt. Refer to figure 3.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 4.
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Page 4
Fan
Motor
Damper
Motor*
Second
Damper
Motor
Transformer**
Transformer**
L3
L2
L1
Wiring Diagrams
Figure 4
Tolerance
Center Distance
Maximum
Gap
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Single Speed, Single Phase Motor
Ground A
L
T-1
T-4
Ground B
When ground is required, attach to ground A or B with no. 6 thread forming
screw. To reverse, interchange T-1 and T-4.
1
Line
L
2
Wiring Diagrams
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
3
1
9
728
L2L
L
3
1
To reverse, interchange any 2 line leads.
High Voltage
460 Volts
456
789
12
L2L
L
1
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
7
6
1
3
L
1
3
8
4
2
L
2
2 Speed, 2 Winding, Single Phase Motor 2 Speed, 1 Winding, 3 Phase Motor
Ground A
T-1
T-4
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4 leads.
High Speed
L
1
L
2
Low Speed
Line
1
Together
2
Motor
3
L
1
4
L
5
2
6
Line
L
3
Motor
To reverse, interchange any 2 line leads. Motors require magnetic
control.
Single Speed, Single Phase, Dual Voltage 2 Speed, 2 Winding, 3 Phase
Ground A
L
T-5
J-10
Ground B
Link A
Link B
Low Voltage
Line
L
1
T-5
J-10
2
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.
Ground A
Link A & B
High Voltage
L
1
Line
L
2
T
Low Speed
3
Low Speed
T
2
Low Speed
T
Motor
T
T
T
1
11
12
13
High Speed
High Speed
High Speed
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T
any 2 line leads.
and T2. Both Speeds-interchange
1
Typical Damper Motor Schematic
High Voltage
460 Volts
9
5
3
L
3
Low SpeedHigh Speed
12
1
2
3
4
5
6
789
456
3
L1L
L
2
L
1
L
2
L
3
Open
3
Line
L
L
L
1
2
Line
3
For 3 phase, damper motor voltage should be the same between L1 and
L
. For single phase application, disregard L3. *Damper motors may be
2
available in 115, 230 and 460 volt models. The damper motor nameplate
voltage should be verified prior to connection. **A transformer may be provided in some installations to correct the damper motor voltage to the
specified voltage.
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley
setscrew and by moving the motor pulley on the motor shaft.
Figure 4 indicates where to measure the allowable ga p
for the drive alignment tolerance. All contact points (indicated by WXYZ) are to have a gap less than the tolerance
shown in the table.
When the pulleys are not the same width, th e allowable
gap must be adjusted by half of the difference in width. Fig-
ure 5 illustrates using a carpenter’s square to adjust the
position of the motor pulley until the belt is parallel to the
longer leg of the square.
OFFSET ANGULAR OFFSET/ANGULAR
A
W
B
CENTER
DISTANCE
(CD)
GAP
X
Y
Z
GAP
4
Page 5
Final Installation Steps
Recommended Torque for Setscrews/Bolts (IN/LB.)
Setscrews
Hold Down Bolts
Size
Key Hex
Across
Flats
Recommended
Torque
Min. Max. Size
Wrench
Torque
No.10 3/32” 28 33 3/8”-16 240
1/4” 1/8” 66 80 1/2”-13 600
5/16” 5/32” 126 156 5/8”-11 1200
3/8” 3/16” 228 275 3/4”-10 2100
7/16” 7/32” 348 384 7/8”- 9 2040
1/2” 1/4” 504 600 1”- 8 3000
5/8” 5/16” 1104 1200 1-1/8” - 7 4200
3/4” 3/8” 1440 1800 1-1/4” - 7 6000
a. Inspect fasteners and setscrews, particularly fan
mounting and bearing fasteners, and tighten according to the recommended torque shown in the table
Recommended Torque for Setscrews/Bolts.
b. Inspect for correct voltage with voltmeter.
c. Ensure all accessories are installed.
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power
sources.
b. Ensure fasteners and setscrews, particularly those
used for mounting the fan, are tightened.
c. Inspect belt tension and pulley alignment.
d. Inspect motor wiring.
e. Ensure belt touches only the pulley.
f. Ensure fan and ductwork are clean and free of debris.
g. Inspect wheel-to-inlet clearance.
The correct wheel-to-inlet clearance
is critical to proper fan performance.
h. Close and secure all access doors.
g. Restore power to the fan.
Start Up
Turn the fan on. In variable speed unit s,
set the fan to its lowest speed and inspect
for the following:
• Direction of rotation.
• Excessive vibration.
• Unusual noise.
• Bearing noise.
• Improper belt alignment or tension (listen for squealing).
• Improper motor amperage or voltage.
If a problem is discovered, immediately shut the fan
off. Lock out all electrical power and check for thecause of the trouble. See Troubleshooting.
Figure 5
Adjust 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 adjusting 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 contaminated air (airborne abrasives) should be inspected
every three months.
Regular inspections are recommended for fans exhausting non-contaminated air.
It is recommended the following inspection be conducted
twice per year.
• Inspect bolts and setscrews for tightness. Tighten as
necessary. Worn setscrews should be replaced immediately.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. See
Belt and Pulley Installation, page 3.
• Bearings should be inspected as recommended in the
Conditions Chart.
• Inspect variable inlet vanes for freedom of operation
and excessive wear. The vane position should agree
with the position of the control arm. As the variable inlet
vanes close, the entering air should spin in the same
direction as the wheel.
• Inspect springs and rubber isolators for deterioration
and replace as needed.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling. Removing dirt from the wheel
and housing prevent imbalance and damage.
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory oper-
ation. During the inspections, stop the fan and inspect as
per the Conditions Chart.
30 Minute Interval
Inspect bolts, setscrews, and motor mounting bolts.
Lubrication Conditions Chart
Fan Class Fan Status Shaft Size
> 2” 7,500
< 2” 1,000
> 2” 1,500
< 2” 200
> 2” 3,000
< 2” 500
> 2” 500
< 2” 100
Standard Duty
Heavy Duty
Normal Conditions
(Clean, Dry & Smooth)
Extreme Conditions
(Dirty/Wet/Rough)
Normal Conditions
(Clean, Dry & Smooth)
Extreme Conditions
(Dirty/Wet/Rough)
Maximum Interval
(operational hrs)
Lubrication
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.
Exceptions to the greasing interval chart:
• Periodic Applications (any break of one week or
more): it is recommended that full lubrication be performed
prior to each break in operation.
5
Page 6
• Higher Temperature: it is recommended to halve the
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to and
including 184T
213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
intervals for every 30°F increase in operating temperature
above 120°F not to exceed 230°F for standard bearings;
High Temperature bearings (optional) can operate up to
400°F.
• Vertical Shaft: it is recommended that the intervals
should be halved.
Lubricants
Loren Cook Company uses petroleum lubricant in a lithium 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.
A NLGI grade 2 grease is a light viscosity, low-torque,
rust-inhibiting lubricant that is water resistant. Its temperature range is from -30°F to +200°F and capable of intermittent highs of +250°F.
Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Direct Drive 1050/1075,1200,1300 &1500 rpm units use
a prelubricated sleeve bearing that has a oil saturated wicking material surrounding it. The initial factory lubrication is
adequate for up to 10 years of operation under normal conditions. However, it is advisable to add lubricant after 3
years. Use only LIGHT grade mineral oil or SAE 10W oil up
to 30 drops. If the unit has been stored for a year or more it
is advisable to lubricate as directed above. For direct drive
units and other units in severe conditions, lubrica tion intervals should be reduced to half.
Motors without sleeve bearings (as described above) will
have grease lubricated ball or roller bearings. Motor bearings without provisions for relubrication will operate up to
10 years under normal conditions with no maintenance. In
severe applications, high temperatures or excessive contaminates, it is advisable to have the maintenance department disassemble and lubricate the bearings after 3 years
of operation to prevent interruption of service.
For motors with provisions for relubrication, follow intervals of the table below.
Fan Bearings
Greasable fan bearings are lubricat ed thr ou gh a
grease fitting on the bearing and should be lubricated
by the schedule, 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.
In the event the bearing cannot be seen, use no
more than three injections with a hand-operated
grease gun.
Motor Services
Should the motor prove defective within a one-year
period, contact your local Loren Cook represent ative or
your nearest authorized electric motor service representative.
Changing Shaft Speed
All belt driven fans with motors up to and including 5
HP (184T max.) are equipped with variable pitch pulleys. To change the fan speed, perform the following:
a. Loosen setscrew on driver (motor) pulley and
remove key, if equipped.
b. Turn the pulley rim to ope n or close the groove
facing. If the pulley has multiple grooves, all must
be adjusted to the same width.
c. After adjustment, inspect for proper belt tension.
Speed Reduction
Open the pulley in order that the belt rides
deeper in the groove (smaller pitch diameter).
Speed Increase
Close the pulley in order that the belt rides higher
in the groove (larger pitch diameter). Ensure that
the RPM limits of the fan and the horsepower limits
of the motor are maintained.
Replacing Pulleys and Belts
a. Remove pulleys from their respective shafts.
b. Clean the motor and fan shafts .
c. Clean bores of pulleys and coat the bores with
heavy oil.
d. Remove grease, rust, or burrs from the pulleys
and shafts.
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on
its shaft. Damage to the pulleys can occur when
excessive force is used in placing the pulleys on
their respective shafts.
g. Tighten in place.
h. Install belts on pulleys and align as described in
the Belt and Pulley Installation section.
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatable grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.
Maximum RPM
Unit
Size
70 3742 6236 190 1389 2315
90 2934 4889 210 1256 2093
110 2397 3994 230 1146 1910
130 2026 3377 260 1016 1693
150 1755 2924 290 908 1513
170 1547 2579
Unless otherwise noted wheel construction for standard duty and heavy duty
is the same. *Standard duty, **Heavy duty
6
Maximum RPM
SD* HD** SD* HD**
Unit
Size
Maximum RPM
Page 7
RPM Derating Factor
Steel Aluminum
Temp. °FRPM Temp. °FRPM
70 1.00 70 1.00
200 .98 200 0.93
300 .96 300 0.79
400 .94
500 .91
600 .87
700 .81
800 .75
For elevated airstream temperatures, the maximum RPM limits must be derated
by the factors found in the RPM Derating Factor table above.
Speed Reduction
Open the pulley in order that the belt rides deeper in
the groove (smaller pitch diameter).
Speed Increase
Close the pulley in order that the belt rides higher in
the groove (larger pitch diameter). Ensure that the
RPM limits of the fan and the horsepower limits of the
motor are maintained.
Replacing Pulleys and Belts
a. Remove pulleys from their respective shafts.
b. Clean the motor and fan shafts.
c. Clean bores of pulleys and coat the bores with heavy
oil.
d. Remove grease, rust, or burrs from the pulleys and
shafts.
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when exces-
sive force is used in placing the pulleys on their
respective shafts.
g. Tighten in place.
h. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Bearing Replacement
The fan bearings are pillow block ball bearings.
An emery cloth or file may be needed to remove imper-
fections in the shaft left by the setscrews.
a. Mark the position on the shaft of both bearing races,
setscrews, and the wheel and pulley. Note the clear-
ance between the wheel and inlet.
b. Remove the fan pulley and belts.
c. Remove the inlet side panel by removing the bolts
around the perimeter of panel.
d. Remove inlet cone by removing attaching bolts/nuts
around perimeter of the inlet plate.
e. Remove wheel from the shaft. A 2-jaw puller may be
needed.
f. Remove bearing hold-down bolts. Remove shaft and
bearings as one unit.g. Remove the anti-corrosion
coating from the shaft with a suitable degreaser.
h. Remove the bearing from the shaft using a bearing
puller. If a bearing puller is not available, tap on the
bearing with a wood block and hammer to remove it.
i. Smooth and clean the shaft and bearing bore thor-
oughly.
j. Place the bearings into position making sure they are
not on a worn section of the shaft. Tapping the inner
ring face with a soft driver may be required.
Do not hammer on the housing.
k. The outer ring of the bearing is spherical and swivels
in the housing to compensate for misalignment.
Secure hold-down bolts, but do not fully tighten.
l. Align the setscrews on the bearings and tighten one
setscrew on each bearing.
m. Rotate the shaft to allow the bearing outer rings to
find their center of free movement.
n. Install the wheel on the shaft and install the inlet side
panel in its original location. Adjust bearing position
and inlet side panel to center the wheel in the inlet.
o. Tighten bearing hold-down bolts to proper torque.
Refer to Torque Chart.
p. Turn the shaft by hand. Resistance should be the
same as it was before hold-down bolts were fully tightened.
q. Tighten bearing setscrews to specified torque as
noted in the Torque Chart.
r. Reinstall the pulley and adjust the belt tension. Refer
to Belt and Pulley Installation.
s. Test run the fan and trim balance as necessary (.0785
in/sec max.).
t. Re-tighten setscrews on bearings, sheave, and wheel.
Recheck belt tension and adjust as needed.
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the fan rotates in same
direction as the arrows on the motor or belt drive assembly.
•Poor fan inlet conditions. There should be a straight clear duct at
the inlet.
•Improper wheel alignment.
Excessive Vibration and Noise
•Damaged or unbalanced wheel.
•Belts too loose; worn or oily belts.
•Speed too high.
•Incorrect direction of rotation. Make sure the fan rotates in same
direction as the arrows on the motor or belt drive assembly.
•Bearings need lubrication or replacement.
•Fan surge or inlet or outlet conditions.
Overheated Motor
•Motor improperly wired.
•Incorrect direction of rotation. Make sure the fan rotates in same
direction as the arrows on the motor or belt drive assembly.
•Cooling air diverted or blocked.
•Improper inlet clearance.
•Incorrect fan RPMs.
•Incorrect voltage.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
7
Page 8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
IMH Parts List - Arrangement 1
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
910
11
12
13
14
15
16
IMH Parts List - Arrangement 8
IMH Parts List - Arrangement 9
Part
No.
Arrangement 1 Part
Sizes 70-290 Sizes 70-290
No.
Arrangement 1
1 Motor Slide Base (Optional) 9 Drive Side Bearing
2 Motor Sheave 10 Shaft Guard (Optional)
3 Motor 11 Opposite Drive Side Bearing
4 Belt Set 12 Wheel
5 Fan Sheave 13 Inlet Side Panel
6 Housing 14 Spreader Bar (2)
7 Shaft 15 Bearing Pedestal
8 Belt Gu ard (Optional) 16 Isolation Base (Optional)
Part
No.
Arrangement 8 Part
Sizes 70-920 Sizes 70-920
No.
Arrangement 8
1 Housing 7 Opposite Drive Side Bearing
2 Motor 8 Wheel
3 Optional Coupling Guard 9 Inlet Side Panel
4 Drive Side Bearing 10 Spreader Bar (2)
5 Shaft 11 Motor/Bearing Pedestal
6 Shaft Guard (Optional)
Part
No.
Arrangement 9 Part
Sizes 70-290 Sizes 70-290
No.
Arrangement 9
1 Motor Sheave 9 Shaft Guard (Optional)
2 Motor Cover (optional) 10 Opposite Drive Side Bearing
3 Belt Set 11 Wheel
4 Fan Sheave 12 Inlet Side Panel
5 Housing 13 Spreader Bar (2)
6 Shaft 14 Bearing Pedestal
7 Belt Guard (Optional) 15 Motor Slide Base
8 Drive Side Bearing 16 Motor
IMH Parts List - Arrangement 10 (Available in SD only)
4
3
2
1
14
13
Limited Warranty
Loren Cook Company warrants that your Loren Cook fan was manufactured free of defects in materials and workmanship, to the extent stated herein. For a period of one (1)
year after date of shipment, we will replace any parts found to be defective without charge, except for shipping costs which will be paid by you. This warranty is granted only to
the original purchaser placing the fan in service. This warranty is void if the fan or any part thereof has been altered or modified from its original design or has been abused,
misused, damaged or is in worn condition or if the fan has been used ot her than for the uses described in the company manual. This warranty does not cover defects resulting
from normal wear and tear. To make a warranty claim, notify Loren Cook Company, General Offices, 2015 East Dale Street, Springfield, Missouri 65803-4637, explaining in
writing, in detail, your complaint and referring to the specific model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be
notified, within thirty (30) days of our receipt of your complaint, in writing, as to the manner in which your claim will be handled. If you are entitled to warranty relief, a warranty
adjustment will be completed within sixty (60) business days of the receipt of your written complaint by Loren Cook Company. This warranty gives only the original purchaser
placing the fan in service specifically the right. You may have other legal rights which vary from state to state.
6
7
5
12
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
9
8
10
11
lorencook.com
Part
No.
Arrangement 10 Part
Sizes 70 - 290 Sizes 70 - 290
No.
Arrangement 10
1 Motor Sheave 8 Opposite Drive Side Bearing
2 B elt Set 9 Wheel
3 Fan Sheave 10 Inlet Side Panel
4 Housing 11 Spreader Bar (2)
5 Shaft 12 Bearing Pedestal
6 Weather Cover/Belt Guard 13 Motor Mount Assembly
7 Drive Side Bearing 14 Motor
8
IMH IOM - February 2008
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