Loren cook Imh User manual

1IMH IO&M B51221-002

IMH

Industrial Material Handler

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 and any

supplemental documents prior to any

installation or maintenance procedure.

Loren Cook catalog, IMH, provides additional informa-

tion describing the equipment, fan performance, available

accessories and specication data.

For additional safety information, refer to AMCA Publi-

cation 410-96, Safety Practices for Users and Installers of

Industrial and Commercial Fans.

All of the publications listed above can be obtained from:

• lorencook.com

• [email protected]

• 417-869-6474 ext. 166

For information on special equipment, contact Loren

Cook Company Customer Service Department at

417- 869 - 6 474.

Rotating Parts & Electrical Shock Hazard:

Fans should be installed and serviced by qualied person-

nel only.

Disconnect electric power before working on unit (prior to

removal of guards or entry into access doors).

Follow proper lockout/tagout procedures to ensure the unit

cannot be energized while being installed or serviced.

A disconnect switch should be placed near the fan in order

that the power can be swiftly cut off, in case of an emer-

gency and in order that maintenance personnel are pro-

vided complete control of the power source.

Grounding is required. All eld-installed wiring must be

completed by qualied personnel. All eld installed wiring

must comply with National Electric Code (NFPA 70) and all

applicable local codes.

Fans and blowers create pressure at the discharge and

vacuum at the inlet. This may cause objects to get pulled

into the unit and objects to be propelled rapidly from the

discharge. The discharge should always be directed in a

safe direction and inlets should not be left unguarded. Any

object pulled into the inlet will become a projectile capable

of causing serious injury or death.

When air is allowed to move through a non-powered fan,

the impeller can rotate, which is referred to as windmill-

ing. Windmilling will cause hazardous conditions due to

unexpected rotation of components. Impellers should be

blocked in position or air passages blocked to prevent draft

when working on fans.

Friction and power loss inside rotating components will

cause them to be a potential burn hazard. All components

should be approached with caution and/or allowed to cool

before contacting them for maintenance.

Under certain lighting conditions, rotating components

may appear stationary. Components should be veried to

be stationary in a safe manner, before they come into con-

tact with personnel, tools or clothing.

Failure to follow these instructions could result in death or

serious injury.

The attachment of roof mounted fans to the roof curb as

well as the attachment of roof curbs to the building struc-

ture must exceed the structural requirements based on the

environmental loading derived from the applicable build-

ing code for the site. The local code ofcial may require

variations from the recognized code based on local data.

The licensed engineer of record will be responsible for pre-

scribing the correct attachment based on construction ma-

terials, code requirements and environmental effects spe-

cic to the installation.

IMH

Receiving and Inspection

Carefully inspect the fan and accessories for any dam-

age and any shortage of accessories 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 mov-

ing parts.

• Record on the Delivery Receipt any visible sign of damage.

2IMH IO&M B51221-002

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 installa-

tion, completely ll the bearings with grease or moisture-

inhibiting oil (refer to Lubricants, page 6). Also, store the

fan in its original crate and protect it from dust, debris and

the weather.

Outdoor Storage

To protect unit from damage when lifting, the lifting

straps and spreader bars should be utilized as shown in

the gure below. To prevent scratching of the exterior sur-

face, pads should be placed between the cabinet and the

cables.

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 accumula-

tion of dirt and moisture in the housing.

• Periodically rotate the wheel and operate dampers (if

supplied).

• Periodically inspect the unit to prevent damaging conditions.

Installation

Most motors are shipped mounted on the fans with

belts and drives installed. However, extremely heavy mo-

tors and drives are shipped separately. These motors and

drives will require eld installation. Please refer to pages

tk 3-5.

Foundation

This fan requires a strong, level foundation of reinforced

poured concrete. A correctly designed concrete founda-

tion provides the best means for mounting oor units. The

foundation’s size is determined by fan size, motor size and

position, and the specic 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 sufcient rigidity to resist belt pull and prevent drive

distortion which can lead to excessive belt and bearing

wear; its perimeter should contain all base angles and ro-

tating parts. Arrangement 10 fans above size 270 require

isolation rails. Please consult factory for isolation of ar-

rangement 9 fans due to the potential of uneven loading

caused by the motor and drives. Isolators should be lo-

cated between the fan system and the support structure.

NOTICE! Although a certain amount of vibration is

inherent in operating centrifugal fans, extreme vi-

bration is a serious problem that may cause struc-

tural and mechanical failure.

Ceiling Mounted Isolators

Some applications require fan systems, designed for

oor 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 in-

clude 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.

Ceiling Mounted Spring Isolator Rubber-in-Shear Ceiling Isolator

Figure 1- Ceiling Mount Isolators

Floor Mounted Spring Isolators

a. Mount fan and motor on isolation base (if supplied).

b. Elevate fan (or isolation base) to operating height and in-

sert 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 iso-

lator 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 rmly in place

against the top of the mounting ange 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 oor. Isolators

must be installed on a level surface (leveling should not

be required).

e. Secure isolators to mounting surface.

Spring Isolator Rubber-in-Shear Isolator

Figure 2- Floor Mount Isolators

3IMH IO&M B51221-002

Duct Installation

Efcient fan performance relies on the proper installa-

tion of inlet and discharge ducts. Be sure your fan con-

forms 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 bulk-

heads. An inlet bell should be used in this case.

Non-Ducted Inlet Clearance

MIN 1 DIA

Free Discharge

Avoid a free discharge into the plenum. This will result in

lost efciency because it doesn't allow for a static regain.

Correct Incorrect

Free Discharge

Inlet Duct Turns

For ducted inlets, allow at least 3 fan wheel diameters

between duct turns or elbows and the fan inlet.

Correct

Incorrect

Inlet Duct Turns

MIN 3

DIA

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 Dis-

charge Duct Turns illustration.

Correct

Incorrect

Discharge Duct Turns

MIN 3

DIA

Wheel-to-Inlet Clearance

The correct wheel-to-inlet clearance is critical to proper

fan performance. This clearance should be veried before

initial start-up since rough handling during shipment could

cause a shift in fan components. Refer to wheel/inlet draw-

ing below for correct clearance. Adjust the overlap by loos-

ening the wheel hub and moving the wheel along the shaft

to obtain the correct value.

WHEEL TO INLET

CLEARANCE

MH, MHB, MHR

WHEEL TO INLET

OVERLAP

MHA

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 4/4

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

Wiring Installation

All wiring should be in accordance with local ordinanc-

es and the National Electrical Code, NFPA 70. Ensure the

power supply (voltage, frequency, and current carrying ca-

pacity of wires) is in accordance with the motor name-plate.

Lock off all power sources before unit is wired to

power source.

Leave enough slack in the wiring to allow for motor move-

ment 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 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. Chang-

ing the rotation of this type of motor should only be at-

tempted by a qualied 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 tk (4) for specic 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 lo-

cation so that the fan is operating in the correct

direction.

4IMH IO&M B51221-002

Belt and Pulley Installation

Belt tension is determined by the sound of the belts when

the fan is rst started. The belts will produce a loud squeal,

which dissipates after the fan is operating at full capacity.

If belt tension is too tight or too loose, lost efciency and

damage can occur.

Do not change the pulley pitch diameter to change ten-

sion. The change will result in a different fan speed.

1. Loosen the motor plate adjustment nuts on motor base

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.

2. Adjust the motor plate until proper tension is reached. For

proper tension, a deection of approximately 1/4” per foot

of center distance should be obtained by rmly pressing

the belt. Refer to Figure 3.

3. Lock the motor plate adjustment nuts in place.

4. Ensure pulleys are properly aligned. Refer to Figure 4.

Use of Variable Frequency Drives

Motors

Motors that are to be operated using a Variable Fre-

quency Drive (VFD) must be VFD compatible. At a mini-

mum, this must be a Premium Efciency motor with Class

F insulation. Motors that are not supplied by Loren Cook

Company should have the recommendation of the motor

manufacturer for use with a VFD.

Grounding

The fan frame, motor and VFD must be connected to a

common earth ground to prevent transient voltages from

damaging rotating elements.

Wiring

Line reactors may be required to reduce over-voltage

spikes in the motors. The motor manufacturer should be

consulted for recommended line impedance and usage of

line reactors or lters, if the lead length between the VFD

and the motor exceeds 10 feet (3m).

Fan

It is the responsibility of the installing body to perform

coast-down tests and identify any resonant frequencies

after the equipment is fully installed. These resonant fre-

quencies are to be removed from the operating range of

the fan by using the “skip frequency” function in the VFD

programming. Failure to remove resonant frequencies

from the operating range will decrease the operating life of

the fan and void the warranty.

Wiring Diagrams

Single Speed, Single Phase Motor

T-

Ground B

Ground A

Line

When ground is required, attach to ground A or B with No. 6 thread

forming screw. To reverse, interchange T-1 and T-4.

2 Speed, 2 Winding, Single Phase Motor

Ground A

Ground B

T-1

T-

Low Speed

High Speed

Line

When ground is required, attach to ground A or B with No. 6 thread

forming screw. To reverse, interchange T-1 and T-4 leads.

Single Speed, Single Phase, Dual Voltage

Ground B

J-10

T-5

Ground A

Link A

Link B

Low Voltage

Line

Ground A

Link A & B

Line

Ground B

T-5

J-10

When ground is required, attach to ground A or B with No. 6 thread

forming screw. To reverse, interchange T-5 and J-10 leads.

3 Phase, 9 Lead Motor

456

L1L2L3

456

789

12 3

L1L2L3

Low Voltage

208/230 Volts

High Voltage

460 Volts

3 Phase, 9 Lead Motor

Y-Connection

6789

456

12 3

Low Voltage

208/230 V

olts

High V

oltage

460 Volts

L1L3

3 Phase, 9 Lead Motor

Delta-Connection

To reverse, interchange any 2 line leads.

2 Speed, 1 Winding, 3 Phase Motor

Motor

Together

High Speed

Line

Open

Low Speed

Line

Motor

To reverse, interchange any 2 line leads. Motors require magnetic

control.

Figure 3

1 foot

1/4 inch

5IMH IO&M B51221-002

2 Speed, 2 Winding, 3 Phase

Low Speed

High Speed

Motor

T13

T12

T11

Line

To reverse: High Speed-interchange leads T11 and T12. Low Speed-

interchange leads T1and T2. Both Speeds-interchange any 2 line

leads.

Typical Damper Motor Schematic

Fan

Motor

Damper

Motor*

Second

Damper

Motor

ansformer** Transformer*

For 3 Phase, damper motor voltage should be the same between L1

and L2. For single phase application, disregard L3. *Damper motors

may be available in 115,230 and 460 volt models. The damper motor

nameplate voltage should be veried prior to connection. **A trans-

former may be provided in some installations to correct the damper

motor voltage to the specied voltage.

Pulley Alignment

Pulley alignment is adjusted by loosening the motor pul-

ley setscrew and by moving the motor pulley on the motor

shaft.

Figure 4 indicates where to measure the allowable gap

for the drive alignment tolerance. All contact points (indi-

cated by WXYZ) are to have a gap less than the tolerance

shown in the Tolerance table.

When the pulleys are not the same width, the allowable

gap must be adjusted by half of the difference in width.

Figure 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.

Tolerance

Center

Distance

Max.

Gap

Up thru 12” 1/16”

12” up

through 48 1/8”

Over 48 1/4”

OFFSET ANGULAR OFFSET/ANGULAR

CENTER

DISTANCE

(CD)

GAP GAP

Final Installation Steps

1. Inspect fasteners and setscrews (particularly fan mount-

ing and bearing fasteners) and tighten according to the

recommended torque shown in the table Recommended

Torque for Setscrews/Bolts.

2. Inspect for correct voltage with voltmeter.

3. Ensure all accessories are installed.

Operation

Pre-Start Checks

1. Lock out all the primary and secondary power sources.

2. Ensure fasteners and setscrews, particularly those used for

mounting the fan, are tightened.

3. Inspect belt tension and pulley alignment.

4. Inspect belt tension on energy wheel drive belt.

5. Inspect motor wiring.

6. Ensure belt touches only the pulley.

7. Ensure fan and ductwork are clean and free of debris.

8. Inspect wheel-to-inlet clearance. The correct wheel-to-inlet

clearance is critical to proper fan performance.

9. Close and secure all access doors.

10. Restore power to the fan.

Start-Up

Turn the fan on. In variable

speed units,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.

NOTICE! If a problem is discovered, immediate-

ly shut off the fan. Lock out all electrical power

and check for the cause of the trouble. Refer to

Troubleshooting.

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" 110 4 1200 1-1/8"-7 4200

3/4" 3/8" 1440 1800 1-1/4"-7 6000

Inspection

Inspection of the fan should be conducted at the rst 30

minute, 8 hour and 24 hour intervals of satisfactory opera-

tion. During the inspections, stop the fan and inspect as

per the Conditions Chart.

30 Minute Interval

Inspect bolts, setscrews and motor mounting bolts.

Adjust and tighten as necessary.

Figure 4

6IMH IO&M B51221-002

8 Hour Interval

Inspect belt alignment and tension. Adjust and tighten

as necessary.

24 Hour Interval

Inspect belt tension on both blowers and energy wheel

drive belt. 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 rst month of operation. Fans should be inspect-

ed every three months.

Regular inspections are recommended for fans exhaust-

ing non-contaminated air.

It is recommended the following inspection be

conducted 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, page tk (3).

• Bearings should be inspected as recommended in the Con-

ditions Chart.

• Inspect variable inlet vanes for freedom of operation and ex-

cessive wear. The vane position should agree with the posi-

tion 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 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.

Lubrication - Fan Bearings

Greaseable fan bearings are lubricated through a

grease tting on the bearing and should be lubricated by

the schedule, Conditions Chart.

Conditions Chart

Fan Class Fan Status Shaft Size Max. Interval

(operational hrs)

Standard

Duty

Normal Conditions

(Clean, Dry & Smooth)

> 2" 7,500

< 2" 1,000

Extreme Conditions

(Dirty/Wet/Rough)

> 2" 1,500

< 2" 200

Heavy Duty

Normal Conditions

(Clean, Dry & Smooth)

> 2" 3,000

< 2" 500

Extreme Conditions

(Dirty/Wet/Rough)

> 2" 500

< 2" 100

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.

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 of more)

It is recommended that the full lubrication be performed prior

to each break in operation.

Higher Temperature

It is recommended to halve the intervals for every 30°F in-

crease in operating temperature above 120°F not to exceed

230°F for standard bearings; High Temperature bearings (op-

tional) 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 lithium

base. Other types of grease should not be used unless the bear-

ings and lines have been ushed 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 intermit-tent highs of

+250°F. For temperatures above 250°F, Mobiltemp SHC 32 is

recommended.

Lubrication - Motor Bearings

Motors are provided with prelubricated bearings. Any lu-

brication instructions shown on the motor nameplate su-

persede instructions below.

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 mainte-

nance department disassemble and lubricate the bearings

after 3 years of operation to prevent interruption of service.

For motors with provisions for relubrication, follow inter-

vals of the following table.

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 month

Motors are provided with a polyurea mineral oil NGLI #2

grease. All additions to the motor bearings are to be with

a compatible grease such as Exxon Mobil Polyrex EM and

Chevron SRI.

The above intervals should be reduced to half for verti-

cal shaft installations.

Maximum RPM

Size Maximum RPM

SD* HD**

70 3742 6236

90 2934 4889

110 2397 3994

130 2026 3377

150 1755 2924

170 1547 2579

Size Maximum RPM

SD* HD**

190 1389 2315

210 1256 2093

230 1146 1910

260 1016 1693

290 908 1513

Unless otherwise noted, wheel construction for standard duty and

heavy duty is the same. *Standard duty. **Heavy duty.

Motor Services

Should the motor prove defective within a one-year pe-

riod, contact your local Loren Cook representative or your

nearest authorized electric motor service representative.

7IMH IO&M B51221-002

Changing Shaft Speed

All belt driven ventilators (5HP or less) are equipped with

variable pitch pulleys. To change fan speed, perform the

following:

1. Loosen setscrew on driver (motor) pulley and

remove key, if equipped.

2. Turn the pulley rim to open or close the groove

facing. If the pulley has multiple grooves, all must

be adjusted to the same width.

3. 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 lim-

its of the fan and the horsepower limits of the motor are

maintained.

Replacing Fan Pulleys and Belts

1. Remove pulleys from their respective shafts.

2. Clean the motor and fan shafts.

3. Clean bores of pulleys and coat the bores with heavy oil.

4. Remove grease, rust, or burrs from the pulleys and shafts.

5. Remove burrs from shaft by sanding.

6. 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.

7. Tighten in place.

8. Install belts on pulleys and align as described in the Belt

and Pulley Installation section.

RPM Derating Factor

Steel

Temp.°F RPM

70 1.00

200 .98

300 .96

400 .94

500 .91

600 .87

700 .81

800 .75

Aluminum

Temp.°F RPM

70 1.00

200 .93

300 .79

For elevated airstream temperatures, the maximum RPM limits must

be derated by the factors found in the tables above.

Bearing Replacement

The fan bearings are pillow block ball bearings. Bearings

should be replaced individually from each side of fan.

An emery cloth or le may be needed to remove imper-

fections in the shaft left by the setscrews.

1. Mark the position on the shaft of both bearing races, set-

screws, and the wheel and pulley. Note the clearance be-

tween the wheel and inlet.

2. Remove the fan pullet and belts.

3. Remove the inlet side panel by removing the bolts around

the perimeter of panel.

4. Remove inlet cone by removing attaching bolts/nuts

around perimeter of the inlet plate.

5. Remove wheel from the shaft. A 2-jaw puller may be

needed.

6. Remove bearing hold-down bolts. Remove shaft and

bearings as one unit.

7. Remove anti-corrosion coating from the shaft with a suit-

able degreaser.

8. 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.

9. Smooth and clean the shaft and bearing bore thoroughly.

10. 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.

11. 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.

12. Align the setscrews on the bearings and tighten one set-

screw on each bearing.

13. Rotate the shaft to allow the bearing outer rings to nd

their center of free movement.

14. Install the wheel on the shaft and install the inlet side pan-

el in its original location. Adjust bearing position and inlet

side panel to center the wheel in the inlet.

15. Tighten bearing hold-down bolts to proper torque. Refer

to Torque Chart.

16. Turn the shaft by hand. Resistance should be the same as

it was before hold-down bolts were fully tightened.

17. Tighten bearing setscrews to specied torque as noted in

the Torque Chart.

18. Reinstall the pulley and adjust the belt tension. Refer to

Belt and Pulley Installation.

19. Test run the fan and trim balance as necessary (.0785 in/

sec max.).

20. 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 propeller alignment.

Excessive Vibration and Noise:

• Damaged or unbalanced propeller.

• 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.

8IMH IO&M B51221-002

Arrangement 1

Part

No. Sizes 70–290 Part

No. Sizes 70–290

1Motor slide Base (optional) 9Drive Side Bearing

2 Motor Sheave 10 Shaft Guard (optional)

3Motor 11 Opposite Drive Side Bearing

4Belt Set 12 Wheel

5 Fan Sheave 13 Inlet Side Panel

6Housing 14 Spreader Bar (2)

7Shaft 15 Bearing Pedestal

8Belt Guard 16 Isolation Base (optional)

Arrangement 8

Part

No. Sizes 70–290 Part

No. Sizes 70–290

1Housing 7Opposite Drive Side Bearing

2Motor 8Wheel

3Optional Coupling Guard 9 Inlet Side Panel

4Drive Side Bearing 10 Spreader Bar (2)

5Shaft 11 Motor/Bearing Pedestal

6Shaft Guard (optional)

Arrangement 9

Part

No. Sizes 70–290 Part

No. Sizes 70–290

1 Motor Sheave 9 Shaft Guard (optional)

2 Motor Cover (optional) 10 Opposite Drive Side Bearing

3Belt Set 11 Wheel

4 Fan Sheave 12 Inlet Side Panel

5Housing 13 Spreader Bar (2)

6Shaft 14 Bearing Pedestal

7Belt Guard (optional) 15 Motor Slide Base

8Drive Side Bearing 16 Motor

Arrangement 10 (available in SD only)

Part

No. Sizes 70–290 Part

No. Sizes 70–290

1 Motor Sheave 8 Opposite Drive Side Bearing

2Belt Set 9Wheel

3 Fan Sheave 10 Inlet Side Panel

4Housing 11 Spreader Bar (2)

5Shaft 12 Bearing Pedestal

6Weather Cover/ Belt Guard 13 Motor Mount Assembly

7Drive Side Bearing 14 Motor

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 modied from its original design or has been abused, misused, damaged or is in worn condition or if the fan has been used other 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 Ofces, 2015 East Dale Street, Springeld, Missouri 65803-4637, explaining in writing, in detail, your complaint and referring to

the specic model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notied, 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 ad-

justment will be completed within sixty (60) business days of the receipt of your written complaint by Loren Cook Company. This warranty gives only the