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PHONE: 630/858-2600 • FAX: 630/858-7172

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8. The run-in period should be at least eight hours. Check bearings a

minimum of once each hour during this period. Overgreasing may

cause bearings to heat up. There need be no concern if the bare hand

can be held on the bearings briefly. Bearings will vent extra grease and

cool down after start-up. Recheck torque of all bearing set screws after

eight and twenty-four hours of operation to insure levels are maintained

per the bearing manufacturer's recommended levels.

9. Take vibration readings at the bearings, or the motor bearings if the

fan wheel is mounted directly on the motor shaft. Adhere to these lim-

its. Velocity Limits in inches/second filter in – Normal: 0.15; Alarm: 0.22,

Shutdown: 0.50.


To insure long life and trouble-free service, frequently check all bearing

lubrication. See the bearing manufacturer's instructions packed with the

fan. Should excessive vibration develop, check the following possibili-


1. Build-up of dirt or foreign material on the wheel.

2. Loose bolts on bearings, housings, foundation and drive.

3. V-belt drives improperly aligned. Belts must have proper tension,

sheaves must be balanced.

4. Check wheel set screws

5. Foreign matter may have entered fan causing damage to wheel, shaft

or bearings.

6. Vibration may be coming from a source other than the fan. Stop the

fan and determine if the vibration still exists. Disconnect driver from

the fan and operate it by itself to determine if it produces vibration.

7. Proper clearance between the wheel and the inlet.

A preventive maintenance schedule is a necessity for extending fan life.

Establish a lubrication schedule based on time periods suggested in

lubrication instructions and by motor and bearing manufacturers.

After approximately one (1) month of operation, all base, hub, bearing,

pedestal, etc. bolts should be checked.

Potentially damaging conditions are often signaled in advance by

change in vibration and sound. A simple, regular audio-visual inspec-

tion of fan operation leads to correction of the condition before expen-

sive damage occurs. Vibration levels should be checked by an

approved technician using electronic balancing equipment.

If air handled by the fan contains corrosive, erosive or sticky materials,

fan should be shut down regularly for inspection, cleaning and recondi-

tioning of interior parts.

If the fan is to remain idle for an extended period, fill bearing with

grease. Protect motor and exposed surfaces. Follow the motor manu-

facturer's recommendations for storage and rotate the shaft by hand

several revolutions each month.

Mechanical Integrity:

Certain operating conditions reduce the built-in

strength in the fan impeller and may cause unsafe operation. It is the

user's responsibility to inspect for these conditions as frequently as

necessary and to make corrections as required. Failure to comply with

the following limits voids the Chicago Blower Corporation warranty.

Maximum Safe Speed and Temperature:

Operation exceeding maxi-

mum safe RPM and temperarture even for a short time causes over-

stressing or fatique cracking of the impeller, resulting in unsafe condi-

tion. Maximum safe speed and maximum safe temprature are shown

on fan assembly drawings, catalogs or order acknowledgement.


The warranty on Chicago Blower fans is our standard warranty.

The warranty on the motor is that extended by the motor manufacturer.


1. Lubricate fan bearings per instructions in packet attached to the fan.

Use a premium quality NLG#1 or 2 grade multi-purpose grease, such

as Shell Alvania Grease 2. Lubricate bearings immediately on receipt.

Add enough grease to cause slight purge at seals. It is common for

bearings to purge excessive grease during first 24 to 48 hours of oper-

ation. See bearing manufacturer's instructions enclosed for lubrication


2. Bearing must be properly locked to the shaft. Check before operation.

Make sure bearing locking collar is in position and set screws are tight-

ened to the bearing manufacturer's recommended torque levels. See

bearing manufacturer's instructions enclosed for details. The bearing

set screws should be re-torqued after eight and twenty-four hours of



Vertical Operation:

If the fan is to operate with its shaft vertical,

reset the fan bearings as follows:

a. With the shaft vertical, unlock the drive end bearing set screws and

turn the shaft by hand. This allows the wheel end bearing to take

the gravity load of the shaft and wheel.

b. Re-lock the drive end bearing locking device and replace and

torque set screws as required by the bearing manufacturer's

instructions so that this bearing now takes only the belt pull.

4. Do not use "high temp" greases. Many are not formulated for the high

speeds associated with fan bearings.


Housing stiffeners or frame should provide rigidity and support to the

housing. Housings are often supplied less stiffeners to provide flexibili-

ty for various installations. See Fan Kit Bulletins –SAF (single width), -

DAF (double width), or –PFD as required for recommended bracing

schedule. Additional support may also be required. Supports should not

restrict air flow to the inlet or discharge of the fan.


After installing the fan per these instructions and the instructions of the

manufacturers, make final safety checks to prevent injury to personnel

or damage to the equipment. Always block rotating parts to prevent

windmilling while inspecting the fan.

1. Lock power source in "OFF" position.

2. Check bearings for alignment and proper lubrication, with wheel and

inside of the housing clean and free of debris.

3. Check wheel position for proper clearance and rotation. Unblock

rotating parts and turn wheel by hand to insure that it rotates freely.

4. Check wheel set screws or bushing for tightness. If fan will see high

temperatures, check to see that the shaft cooling wheel bolts are tight.

Check foundation bolts. Secure safety guards and access doors.

5. Start fan and allow unit to reach full speed, then shut down. During

this short period, check for rotation, excessive vibration, any unusual

noise, or overheating of the motor. Check the motor amps drawn

against the nameplate rating. A plate over the fan inlet will limit the

horsepower drawn during a test run with limited ductwork.

6. After the trail run lock the power "OFF".

7. Recheck for tightness of hold-down bolts, wheel set screws andkeys,

and retighten if necessary. Recheck after eight and twenty-four hours of


an ISO 9001 Company