AEC AG Auger Series Granulator - Manual (Page 23)

6.5” Granulators Chapter 5: Maintenance 22 of 35
5-7 Adjusting Belt Tension
Belts should be checked on a weekly basis for nicks, cuts, tension, or excessive wear. Any
belt of a multi-belt system showing damage or excessive wear should be replaced with a belt
of equal strength and size. For best results, replace belts in matched sets.
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 4 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. Use the following procedure to adjust the belt tension:
1. Turn off the granulator at the main isolator switch and remove fuses.
2. Remove the cover to gain access to the belts.
3. Turn the adjusting screw on the motor slide base to tension the belts as required (See
Figure 4).
4. Re-tighten the screws, making sure the pulleys are in correct alignment.
5. Replace the covers.
Figure 4: Belt Tensioning Information
Super Gripbelts Gripnotch Belts Steel Cable Gripbelts Belt Cross
Section Small P.D.
Range
Min Max Min Max Min Max
3.0-3.6 3 4-1/4 3-7/8 5-1/2 3-1/4 4
3.8-4.8 3-1/2 5 4-1/2 6-1/4 3-3/4 4-3/4
A
5.0-7.0 4 5-1/2 5 6-7/8 4-1/4 5-1/4
3.4-4.2 4 5-1/4 5 6-7/8 4-1/4 5-1/2
4.4-5.6 5-1/8 7-1/8 6-1/2 9-1/8 5-3/4 7-1/4
B
5.8-8.6 6-3/8 8-3/4 7-3/8 10-1/8 7 8-3/4
7.0-9.4 11-1/4 14-3/4 13-3/4 17-7/8 11-1/4 14 C
9.6-16.0 14-1/8 18-1/2 15-1/4 20-1/4 14-1/4 17-3/4
12.0-16.0 23-5/8 30-1/4 23-3/4 30-1/2 D
18.0-27.0 29-3/4 39-1/2 30-1/8 39-3/4
E 20.0-32.0
*The deflection force value shown is for each belt and must be multiplied by the number of
V-belt elements if all are deflected.
Deflection = Belt Span
64
Belt Span