Owner manual

Page 30 of 48
Figure 7: Minimum Knife Dimensions
6-2-4 Drive Belt Tension
For continuing reliable operation of the granulator, it is of the
utmost importance that the motor drive belt tension is correct.
Correct tension reduces wear on the rotor and motor bearings and
reduces slip to a minimum.
Belt drives must be tensioned at the “Run-In” recommended force.
Check the tension at least twice during the first two days’
operation. After the belts have seated themselves in the sheave
grooves and the initial stretch is removed, re-tension the belts to
the “Normal Running” recommended force.
A gauge is available from customer service or the belt
manufacturer which facilitates the measurement of belt deflection
and force.
The Belt Tensioning Chart in Figure 8 gives the recommended
force required to deflect teach belt by an amount equal to the belt
span divided by 64. The Deflection Force Value relates to a single
V-belt element.
1. Turn the Main Power switch to Off, lock out the power supply,
and remove the line fuses.
2. Remove the belt guard to gain access to the belts.
3. Determine the type of belt required from the Recommended
Spares List on page 42.
4. Determine the force required to deflect one belt 1/64” (0.40
mm) per 1 inch (25.4 mm) of span length as follows:
a. Measure span length (t) of your drive.
Grind these
surfaces only
32
35°
Keen Edge
Std. Rotor Knife
Std. Bed Knife
3.089 (min.)
3.307 (new)
2.256 (min.)
2.756 (new)
32
Grind these
surfaces only
32
35°
Landed (55°)
Std. Rotor Knife
Std. Bed Knife
2.256 (min.)
2.756 (new)
32
32
20°
3.246 (new)
3.028 (min.)