Chapter 6 – Exhaust Fan Section, Page 6-2_____________________________________________________
Exhaust Fan – Initial Set-Up (Cont.)
Pre-Operational Maintenance
Before starting the exhaust fan perform the following pre- operational maintenance:
1.
Set screws & Belts:
a)
Rotate fan impeller to check for shifting that may have occurred during shipment. If necessary,
shift wheel position and re-tighten.
b)
Check belt and pulley alignment.
c)
Check tightness of setscrews in blower wheel hub.
d)
Check tightness of set screws in bearing locking collar.
e)
Check tightness of set screws in motor and fan pulleys.
f)
Check tightness of all frame bolts and base bolts.
g)
Check tightness of bearing mounting bolts.
2.
Belt tension:
a)
The deflection of the belt is approximately 1/4 inch per foot of center distance when firmly
pressing the belt in the center.
b)
If the belt does not have the proper deflection, adjustment is accomplished by use of
adjustable motor base.
Initial Fan Lubrication
To prevent corrosion, bearings should receive grease and be rotated. Proceed as follows:
1.
Completely fill the bearings with grease or moisture-inhibiting oil. Loren Cook Company uses
petroleum lubricant in a lithium base. For best results, lubricate the bearings while turning the fan
wheel. Pump grease in slowly until a slight bead forms around the bearing seals. Excessive grease
can burst seals thus reducing bearing life.
Access Panels to
Spring Isolators
Figure 6-2-1
Access to Spring
Isolators
