Bearing Replacement, Inlet Cone to Backplate Distance

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.

Overlap

Inlet Cone to Backplate Distance

Unit Size	“A” Dimension
Unit Size		(inches)
		(inches)

12	4	± 1⁄8
15	5	± 1⁄8
18	63⁄8	± 1⁄8
22	713⁄16	± 3⁄16
24	85⁄8	± 1⁄4
27	97⁄16	± 1⁄4
30	109⁄16	± 3⁄8
33	117⁄16	± 3⁄8
36	123⁄4	± 3⁄8
40	143⁄16	± 3⁄8
44	159⁄16	± 3⁄8
49	171⁄8	± 1⁄2
54	1813⁄16	± 1⁄2
60	2015⁄16	± 1⁄2
66	227⁄8	± 1⁄2