Wheel Replacement; Troubleshooting - COOK TMX Installation, Operation And Maintenance Manual

2. Remove the inner housing cover by removing the bolts
around the perimeter of the cover. Do not remove fan
sheave yet.
3. Remove inlet cone by removing attaching bolts/nuts
around perimeter of the inlet plate.
4. Remove wheel by loosening setscrews and sliding off
shaft.
5. Record the location of the fan sheave from end of
shaft, and remove the sheave.
6. Record the distance from the bearing to the end of the
shaft.
7. Loosen setscrews on bearings and remove shaft.
8. Remove bearings from bearing base and replace with
new ones, noting the exact location of each; do not
fully tighten base bolts.
9. Slide shaft through bearings until shaft protrudes the
same amount as measured above. Tapping the in-
ner race of each bearing with a soft driver may be re-
quired. Do not hammer the end of the shaft or the
bearing housing.
10. Tighten one setscrew on each bearing to half its speci-
fied torque (Page 5).
11. Rotate shaft to allow bearings to align themselves.
12. Replace wheel but do not tighten yet.
13. Replace inlet cone. Wheel may need to be moved to
allow proper alignment. Care should be taken to in-
sure that inlet cone is centered inside wheel before
and after tightening attaching bolts.
14. Slide wheel on shaft to achieve proper wheel/inlet
overlap and tighten wheel set screws. Refer to Wheel-
to-Inlet Clearance (page 3).
15. Tighten hold-down bolts to proper torque.
16. Turn the shaft by hand. Resistance should be the same
as it was before hold-down bolts were fully tightened.
17. Tighten all bearing setscrews to full specified torque.
18. Replace the sheave, align with motor sheave and ad-
just the belt tension.
19. Test run fan and retighten all setscrews and bolts and
trim balance as necessary. (0.150 in/sec max).
20. Replace inner housing cover.

Wheel Replacement

1. Drill two holes approximately centered between the
shaft and the edge of the hub outer dimension with the
following dimensions:
• 1/4" diameter
• 3/8" to 1/2" deep
• 180° apart in face of hub
2. Tap 1/4" holes to 5/16" thread with the 5/16" hole tap.
Do not drill or tap any larger than recommended.
3. Screw the puller arms into the tapped holes full depth
of threads (3/8" to 1/2" approximately). Align center of
puller with center of shaft. Make certain all setscrews
in hub (normally a quantity of two) are fully removed.
Recommended Puller:
Lisle No. 45000 Steering Wheel
Puller. This puller is available at most
automotive parts retail outlets.
Drilled Hole Location
Drilled hole placement.
TMX IO&M
Work puller slowly to back wheel
off the shaft.

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 or outlet
• Improper wheel alignment
• Fan installed backwards. Verify airflow diagram on page 5.
Excessive Vibration and Noise:
• Damaged wheel
• Belts misaligned
• Belts too loose; worn or oily belts
• Loose fasteners
• 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
• Bearing set screws loose
• Bearings need lubrication or replacement
• Debris in impeller
• Fan surge
• See page 4 for issues regarding use of VFD
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 speed
• Incorrect voltage
Overheated bearings:
• Improper bearing lubrication
• Excessive belt tension
7 B51108-003