In this presentation we will be illustrating how to take apart and reassemble a quad split
fan.
This style of fan comes fully assembled from the factory.
The tools that you may need are a rubber mallet, Allen wrenches, a torque wrench with the proper
size socket for your hub and wrenches to fit cone bolts, split bolts and base bolts.
Take a marker and go around the cone flange in a few spots for alignment during reassembly.
Remove the bolts from the inlet cone and then remove the cone from the fan.
The cone may be held in place by foam tape.
You may need to pry the cone loose to remove it.
The shaft and bushing has black protectant on it that will need to be removed.
You can use brake cleaner or carb cleaner to remove the protectant.
Make sure to wear proper safety gear.
Once the protectant is removed, take a scribe or marker and mark on the wheel hub the location
of the key.
Also mark the location of the bushing on the shaft, or take note of the measurement from
the end of the shaft to the bushing.
Loosen the set screw in the bushing.
Remove the bushing according to instructions in the fan packet.
Once the bushing is removed, remove the wheel with a fork lift.
It helps to put a wood block across the forks for balancing the wheel.
Smaller wheels can be lifted out by hand.
To gain access to the bolts from the drive side of the fan housing, remove any weather
hood panels if it has them.
If there is a seal you will need to unbolt it and slide it towards the bearing, before
you can proceed.
Now you can remove bolts from the pedestal to the housing and the isolation base.
Separate the housing from the pedestal.
Remove bolts from the split sections beginning at the top.
Place the sections onto skids.
Be careful not to damage the parts.
Now for reassembling the unit, place the pedestal on a flat surface or isolation base.
When bolting the house split sections back together, be sure that gasketing is intact.
Put all bolts in before tightening.
Once the housing split bolts are tight, move the housing to the pedestal and bolt the two
pieces together.
If there is a seal, bolt it back into place.
Place the wheel on the shaft and slide the bushing on the shaft to the scribe mark or
the measurement you had noted before removing it.
Tighten the set screws in the bushing.
Pull the wheel hub onto the bushing.
Make sure the key is lined up with the mark on wheel hub.
Snug the bushing bolts to the wheel hub.
Ensure the sealing tape is intact and undamaged.
Then install the cone leaving the bolts loose enough to align the cone with the marks on
the housing, or evenly spaced within the wheel.
Rotate the wheel to make sure it does not rub on the inlet cone.
Tighten the inlet cone bolts.
If necessary, you may need to adjust the wheel position by loosening the wheel hub bolts
and set screw.
Take a straight edge and hold it tight against the wheel cone, just touches the inlet cone,
as shown in the diagram.
Once the inlet cone and wheel overlap are correct, use the torque wrench to tighten
the set screws and bushing bolts according to the manufacturer's recommendations.
Rotate the wheel again to double check the clearances.
After completion, review the IOM.
It is recommended to have the fan checked for vibration after start up.