Loren Cook QMX Installation Manual

EZ-OUT

1

QMX Belt Drive Bifurcated Housing

®

Installation, Operation & Maintenance Supplement

This publication contains supplemental installation,
operation and maintenance procedures for QMX Mixed­Flow Blowers with the EZ-Out Belt drive bifurcated
housing option.

Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.

Loren Cook Company’s QMX catalog provides
additional information describing the equipment, fan

performance, available accessories and specication

data. For information and instructions on special
equipment, contact Loren Cook Company.

For additional safety information, refer to AMCA
publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans. This
document and all Cook publications may be obtained
from Cook by phoning [phone], extension 166; by
FAX at [phone]; or by e-mail at info@LorenCook.
com. All Cook publications are available on
com

.

LorenCook.

Bearing Replacement

The fan bearings are pillow block ball and/or roller
bearings. This process can be accomplished without
entering the contaminated airstream, however Loren
Cook recommends consulting with your safety advisor
prior to proceeding.

1. Loosen and remove the belts by adjusting the motor
mounting plate.

2. Remove the vented bearing cover located in the
bifurcated housing opening, 180° from the motor.

3. Locate the shaft seal, Figure 1. Remove the speed
screws to loosen the seal.

4. Locate the shaft seal plates, Figure 1. Remove the
bolts and remove the seal plate in sections.

5. Once the shaft seal plates are removed the (2)
wheel retaining holes will be exposed. Remove the
(2) wheel retaining bolts, Figure 1, that are located
on top of the bearing support. Install them in the

wheel retaining holes until they are ush with the

housing panel slightly supporting the wheel as
shown in Figure 2. NOTICE! It is important that

you do not over-tighten the retaining bolts as
this may bind the bearings.

6. Record the location of the fan sheave, Figure 1,
from the end of the shaft, and remove the sheave.

7. Disconnect all extended lube lines from the
bearings and move aside as required.

8. Record the distance from the drive side bearing,
Figure 1, to the end of the shaft, and note the exact
location on the bearing plate. Remove the drive
side bearing by loosening the bearing collar and
removing the bearing hold-down bolts, Figure 1.
This bearing may have a bearing shim that will need
to be removed and set aside for reinstallation.

9. Record the distance from the wheel side bearing,
Figure 1, to the end of the shaft, and note the exact
location on the bearing plate. Remove the wheel
side bearing by loosening the bearing collar and
removing the bearing hold-down bolts, Figure 1.

NOTICE! Minimize shaft movement to keep from
damaging the wheel and/or inlet.

10. Install new bearings by sliding them down the shaft
starting with the wheel side bearing, noting the
exact locations of each and lightly tighten each
bearing hold-down bolt. Tapping the inner race of
each bearing with a soft driver may be required.
Also be sure to reinstall the drive side bearing shim
if one was set aside from above (step 8). NOTICE!

Do not fully tighten the bearing hold-down
bolts, Figure 1, to the base.

11. Once each bearing is in place fully tighten the drive
side bearing hold-down bolts and bearing collar to

the bearing manufacturer specied torque.

12. Remove the wheel retaining bolts and return them
to the top of the bearing support.

13. Rotate the shaft by hand to allow the bearings to
align themselves.

14. Fully tighten the wheel side bearing hold-down
bolts and bearing collar to the bearing manufacturer

specied torque.

15. Rotate the shaft by hand again. Resistance should
be the same as it was before the bearing hold-down
bolts were fully tightened.

16. Reinstall the fan sheave, align with motor sheave.

17. Reinstall all extended lube lines as required.

18. Reinstall the belts, tighten the motor mounting plate
and trim balance as necessary (0.785 in/sec max).

19. Reinstall the bearing cover.

Fan sheave

Wheel retaining
bolts storage

Drive side bearing

Bearing hold
down bolts

Wheel side
bearing

Shaft seal

Shaft seal plate

Figure 1: Close-up photo of the

shaft / bearing compartment.

2

Bearing and Shaft Replacement

The fan bearings are pillow block ball and/or roller
bearings. This process can be accomplished without
entering the contaminated airstream, however Loren
Cook recommends consulting with your safety advisor
prior to proceeding.

1. Loosen and remove the belts by adjusting the motor
mounting plate.

2. Remove the vented bearing cover located in the
bifurcated housing opening, 180° from the motor.

3. Locate the shaft seal, Figure 1. Remove the speed
screws to loosen the seal.

4. Locate the shaft seal plates, Figure 1. Remove the
bolts and remove the seal plate in sections.

5. Once the shaft seal plates are removed the (2)
wheel retaining holes will be exposed. Remove the
(2) wheel retaining bolts, Figure 1, that are located
on top of the bearing support. Install them in the

wheel retaining holes until they are ush with the

housing panel slightly supporting the wheel as
shown in Figure 2. NOTICE! It is important that

you do not over-tighten the retaining bolts as
this may bind the bearings.

6. Note the exact bearing locations to the bearing
plate; disconnect all extended lube lines from the
bearings and move aside as required.

7. Remove the self-aligning hub hold-down bolts,
Figure 2, to loosen the hub from wheel.

8. Remove the wheel side bearing hold-down bolts,
Figure 1, to loosen the bearing form the fan bearing
support.

9. Remove the drive side bearing hold-down bolts,
Figure 1, to loosen the bearing form the fan bearing
support. The drive side bearing may have a bearing
shim that will need to be removed and set aside for
reinstallation.

10. Remove the entire shaft and bearing assembly from
the fan housing.

11. Record the location of the fan sheave, Figure 1,
from the end of the shaft, and remove the sheave.

12. Record the distance from the drive side bearing,
Figure 1, to the end of the shaft. Remove the drive
side bearing by loosening the bearing collar.

13. Record the distance from the wheel side bearing,
Figure 1, to the end of the shaft. Remove the wheel
side bearing by loosening the bearing collar.

14. Record the location of the wheel hub from the
drives side end of the shaft and remove the hub
from the shaft by removing the bushing hold-down
bolts and reinstalling them in the bushing push-out
holes. This process will pop the bushing off the hub
allowing the shaft to be removed.

15. Slide the new shaft through the hub and bushing
until it protrudes the same amount as measured.

16. Tighten the bushing hold-down bolts to the proper
torque. Be sure to install the existing shaft seal
before installing the new bearings, leave loose.

17. Install new bearings by sliding them down the shaft
starting with the wheel side bearing, Figure 1, noting
the exact locations of each. Tapping the inner race
of each bearing with a soft driver may be required.

18. Rotate the shaft by hand to allow the bearings to

align themselves.

19. Fully tighten each bearing collar to the bearing

manufacturer specied torque and rotate shaft by

hand.

20. Reinstall the fan sheave, Figure 1, to the proper
location.

21. Install the shaft and bearing assembly by hand
tightening the self-aligning hub hold-down bolts,
Figure 2, to the wheel

22. Lightly tighten each bearing hold-down bolt, Figure
1, be sure to reinstall the drive side bearing shim if
one was set aside from above (step 9). NOTICE! Do

not fully tighten the bearing hold-down bolts,
Figure 1, to the base.

23. Once the drive component assembly is in place fully
tighten the self-aligning hub hold-down bolts, Figure
2, and drive side bearing hold-down bolts, Figure 1,
to the required torque.

24. Remove the wheel retaining bolts and return them
to the top of the bearing support as shown in Figure
1 and rotate the shaft by hand again.

25. Fully tighten the wheel side bearing hold-down
bolts, Figure 1, to the proper torque and rotate the
shaft by hand again. Resistance should be the
same as it was before the bearing hold-down bolts
were fully tightened.

26. Reinstall the shaft seal plates, Figure 1, and fasten
the shaft seal, Figure 1.

27. Reinstall the extended lube lines as required and
align the fan sheave, Figure 1, with the motor
sheave if necessary.

28. Reinstall the belts, tighten the motor mounting plate
and trim balance as necessary (0.785 in/sec max).

29. Reinstall the bearing cover.

Wheel and Inlet Replacement

This process will require entering the contaminated

airstream. NOTICE! Do not proceed without rst

consulting with your safety adviser.

1. Remove the inlet cone by removing attaching bolts/
nuts around perimeter of the inlet plate.

2. Remove the vented bearing cover located in the
bifurcated housing opening, 180° from the motor.

3. Locate the shaft seal, Figure 1. Remove the speed
screws to loosen the seal.

4. Locate the shaft seal plates, Figure 1. Remove the
bolts and remove the seal plate in sections.

5. Support the old wheel inside the housing and
remove the self-aligning hub hold-down bolts,
Figure 2.

6. Remove the wheel hub from the shaft by removing
the bushing hold-down bolts and reinstalling them
in the bushing push-out holes. This process will
pop the bushing off the hub allowing the shaft to be
removed.

7. Install the new wheel with hub attached, less
bushing by supporting the new wheel until held in
place using the (2) wheel retaining bolts, Figure 1,
that are located on top of the bearing support, install
them in the wheel retaining holes and align the
wheel in the proper location as shown in Figure 2.

8. Install the hub bushing, but do not fully tighten the