BAC RC Series - Fan Drive System (Belt Direct Drive Units)

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W W W . B A L T I M O R E A I R C O I L . C O M . A U
M A R 2 1 0 - 2
Detailed Component
Maintenance Procedures
Fan Drive System
(Belt Drive Units)
Belt Drive Power Train
Inspection & Maintenance
• Belt tension check:
– Place a straight edge along the belt from sheave to sheave as
shown in Figure 3a, or use a tape measure as shown in Figure
3b to measure belt deection.
– Apply a moderate force by hand (approximately 2kg) evenly
across the width of the belt in the centre of the span between
the sheaves.
– There is adequate belt tension if the belt deects between 6mm
and 9mm as shown in Figures 3a and 3b.
–
• Belt tension adjustment (if required):
1. Loosen the motor pulley guard retaining nuts.
2. Loosen the lock nuts on the Motor Base Adjusting Screws.
3. Turn the Motor Base Adjusting Screws clockwise to tension the
belt, or counterclockwise to relieve belt tension. During adjustment
of belt tension the drives should be rotated several times by hand
to evenly distribute the tension throughout the belt.
4. When the belt is properly tensioned, retighten the locking nuts
on the Motor Base Adjusting Screws.
5. Tighten guard nuts.
Note: There should be no “chirp” or “squeal” when the fan motor is started.
NOTE: There should be no “chirp”
or “squeal” when the fan motor
is started.
Figure 4. Adjustable Motor Base (cover removed)
Motor Base
Locking Nuts
(both sides)
Adjusting
Screws