AEC Colortronic MSH Series 2039 - Manual (Page 35)

C Series Granulators Maintenance 35 of 53
5-10 Adjusting Belt Tension
For continuous reliable operation of the granulator, it is important that the belt tension is
correct. Correct tension reduces wear on rotor and motor bearings and keeps belt slip to a
minimum. Figure 7 gives the recommended force to deflect each belt by an amount equal to
the belt span divided by 64. A gauge is available through the sales department to measure the
deflection and force.
Tension new belts at the maximum run-in force, and check the tension at least two times
during the first two days of operation. There is normally a rapid decrease in the tension until
the belts are run in.
Note: The deflection force value shown must be multiplied by the number of V-belt
elements.
1. Turn off the granulator at the main isolator switch and remove fuses.
2. Remove the belt guard to gain access to the belts.
3. Determine the type of belt required from the Spare Parts List on page 49.
4. Determine the force required to deflect one belt 1/64” (0.40 mm) per 1 inch (25.4
mm) of span length.
5. Loosen the motor base slide mount screws and turn the adjusting screw on the base to
tension the belts as required (See Figure 7).
6. Re-tighten the screws, making sure the sheaves are in correct alignment.
7. Replace the covers.
Figure 7: Belt Tensioning Information
Recommended Deflection Force V-Belt Cross
Section
Small O.D. Range
Run-In Normal
Running
5V 7.1”-10.9” (180 mm-275 mm) 22 lbs. (10 Kg) 15 lbs. (6.8 Kg)
8V 12.5”-17.0” (318 mm-432 mm) 50 lbs. (22.7 Kg) 33 lbs. (15 Kg)
*This deflection force value relates to a single V-belt element. Therefore, if the belt is a 3-V
element (3V-banded), this value must be multiplied by 3.
Deflection = Belt Span
64
Belt Span=37”