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.
Sheave alignment standard drives
1.
Motor sheave
2.
Fan sheave
3.
Points of contact
When the drives are properly aligned the straight edge will contact all four points as indicated. There should be no
more than 1,5 mm deviation from four point contact. If realignment is necessary, loosen the motor sheave and
align it with the fan sheave. Allow approximately 6 mm for draw-up as the bushing screw is re-tightened.
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. Remove the drift eliminators through the sliding access doors.
3. Loosen the set screw.
4. Using a drift pin centre-punch, tap the collar (in the hole provided) tangentially in the direction of rotation while
holding the shaft.
5. Re-tighten the screw.
6. Reinstall the eliminators, close the sliding access doors and start pump(s) and fan(s).
Locking collar assembly
1.
Locking collar
2.
Lubrication fitting
3.
Set screw hole
ROTATION OF FAN(S)
Fans must rotate without obstruction and must rotate in the correct direction, which is indicated by arrows on the
equipment. Check proper functioning as follows:
1. Stop fan(s).
2. Turn the fan by hand to ensure rotation without obstruction. Remove obstruction, if present.
3. Start the fan(s) and check for proper rotation as indicated by the arrow on the fan housing. If rotation is wrong
stop fan(s) and correct fan motor wiring.
W W W . B A L T I M O R E A I R C O I L . E U
21
5 Maintenance Procedures
5 Maintenance Procedures
