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Vektor-CD Centrifugal Laboratory Exhaust
®
Bearing Replacement
Both drive bearings are accessible from the ground
on all Vektor-CD fans. Whether direct or belt driven,
the bearings, along with other serviceable drive
components (belts, motors, sheaves) are accessible
by removing the motor cover panel. Please contact
Greenheck Fan Corporation for specific instructions
on the replacement of the bearings specific for each
Vektor-CD fan. Please include fan identification
numbers with the request to ensure that proper
instructions are received.
Note: Bearing replacement could require moving
of fan wheel. See Radial Gap, Overlap & Alignment
section to re-align wheel upon bearing reinstallation.
Radial Gap, Overlap & Wheel Alignment
Efficient fan performance can be maintained by having
the correct radial gap, overlap and wheel alignment.
These items should be checked after the fan has been
in operation for 24 hours and before start-up after the
unit has been serviced.
Radial gap is adjusted by loosening the inlet cone/
ring bolts and centering the cone/ring on the wheel.
If additional adjustment is required to maintain a
constant radial gap, loosening the bearing bolts and
centering the wheel is acceptable as a secondary
option.
Overlap is adjusted by loosening the wheel hub from
the shaft and moving the wheel to the desired position
along the shaft. The transition between the inlet cone
and wheel should be as shown; there is a smooth feel
to the profile when moving from one component to the
other. Overlap on double width fans is set by having
equal spacing on each side of the wheel.
Radial
Gap
Overlap
A
Inlet
Cone
Wheel
Inlet Cone to Backplate Distance
Unit Size
“A” Dimension
(inches)
12 4
±
1
⁄8
15 5
±
1
⁄8
18 6
3
⁄8
±
1
⁄8
22 7
13
⁄16
±
3
⁄16
24 8
5
⁄8
±
1
⁄4
27 9
7
⁄16
±
1
⁄4
30 10
9
⁄16
±
3
⁄8
33 11
7
⁄16
±
3
⁄8
36 12
3
⁄4
±
3
⁄8
40 14
3
⁄16
±
3
⁄8
44 15
9
⁄16
±
3
⁄8
49 17
1
⁄8
±
1
⁄2
54 18
13
⁄16
±
1
⁄2
60 20
15
⁄16
±
1
⁄2
66 22
7
⁄8
±
1
⁄2