Baltimore Aircoil Company VT0 Series Operating And Maintenance Instructions Manual page 20

DRIVE ALIGNMENT
Proper drive alignment ensures maximum belt life. Alignment is checked for standard drives after correct belt
tensioning by placing a straight-edge across both sheaves as shown in the Figure below.
When the drives are properly aligned the gap measured between straight-edge and sheave does not exceed 0,5
mm per 100 mm of fan sheave diameter.
Checking sheave alignment
1. Motor sheave
2. Fan sheave
3. Points of contact
LOCKING COLLAR
The excentric locking collar of the bearing at the drive end ensures that the inner bearing race is secured to the fan
shaft. Locking collars can be set using the following procedure. (See figure below)
1. Stop fan(s) and remove side access panel(s).
2. Loosen the set screw.
3. Using a drift pin centre-punch, tap the collar (in the hole provided) tangentially in the direction of rotation while
holding the shaft.
4. Re-tighten the screw.
5. Close unit access door and start pump(s) and fan(s).
Locking collar assembly
1. Direction of rotation
2. Drift pin: Tap the locking collar in direction of fan rotation until cam is locked.
3. Tighten set screw.
ROTATION OF FAN(S) AND PUMP(S)
Fans must rotate without obstruction and both fans and pumps must rotate in the correct direction, which is
indicated by arrows on the equipment. Check proper functioning as follows:
1. Stop fan(s) and pump(s).
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