MK Plastics Axijet IO&M - Manual (Page 13)

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 drive
belt 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 drive
belt assembly.
•
Bearings need lubrication or replacement.
•
Fan surge or incorrect inlet condition.
Overheated Motor
•
Motor improperly wired.
•
Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or drive
belt assembly.
•
Cooling air diverted or blocked.
•
Improper inlet clearance.
•
Incorrect fan RPM.
•
Incorrect voltage.
Overheated Bearings
•
Improper bearing lubrication.
•
Excessive belt tension.
Page13
Fig. 15 – Flange Bearing Assembly
6. Re-attach the flange bearing assembly to the stand plate, but make sure the PVC spacer is in good condition.
Replace if necessary.
7. Inspect and clean the bore of the wheel. Gently slide the wheel onto the shaft after inserting the pulley key,
and re-install the threaded stud, nut and washers to the shaft, and tighten. Make sure the wheel hub is sitting
well against the snap ring on the shaft. Re-install the cap and tighten well.
8. Re-attach all the pulleys and adjust the belt tension.
9. Test run and retighten all screws and bolts if necessary.
Troubleshooting
Flange Bearing Replacement
(Axijet-F 1225 & 1500 only)
Please refer to Fig. 15 for the following procedures.
The fan bearings are housed inside the flange bear-
ing assembly, which includes the shaft. It is easier
and quicker to replace the entire assembly, rather
than the bearings themselves.
1. Remove the fan drive belt and pulley.
2. Remove by unscrewing the front protective
cap, and then the nut, washers and
threaded stud. Removal of the inlet collar
on the front of the fan will give you better
access.
3. Remove the wheel from the shaft – a 2-jaw
puller may be needed.
4. Remove the assembly hardware that holds
the entire assembly to the stand plate. The
flange bearing assembly can now be re-
moved, complete with the shaft.
5. Before replacing the assembly, make sure
the shaft and keys are clean and smooth.