6
DB IO&M
B51131-002
Wheel Replacement
SDB
1. Drill two holes approximately centered between the
shaft and the edge of the hub OD 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.
Work puller slowly to back wheel off the shaft.
Recommended Puller
Lisle No. 45000 Steering Wheel Puller. This puller is
available at most automotive parts retail outlets.
Wheel Puller
Drilled Hole Location
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
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 Motor:
• Improper bearing lubrication
• Excessive belt tension
