Owner manual

Page 31 of 48
b. At the center of span (t), apply a force perpendicular to
the span large enough to deflect one belt on the drive
1/64” (0.40 mm) span length from its normal position.
5. Compare this deflection force with range of forces in the Belt
Tensioning Chart as follows:
a. If it is less than the “Normal Running” recommended
force, belts should be tightened.
b. If it is more than the “Run-In” recommended deflection
force, the drive is as tight as it needs to be.
6. Loosen the motor base slide mount screws and turn the
adjusting screw on the base to tension the belts as required.
(See Figure 10.)
7. Re-tighten the sliding base mount screws, making certain that
the sheaves are in correct alignment.
8. Replace the belt guard previously removed.
9. Replace the line fuses, unlock the power supply and turn the
Main Power switch to On.
Figure 8: Belt Tensioning Chart
Recommended Deflection Force
(Lbs.)
V-Belt Cross
Section
Small Sheave
Diameter
Range
(Inches)
Small Sheave
RPM Range
Speed Ratio
Range
Run-In Normal Running
B3.4
4.6
5.0-5.2
5.4-5.6
6.0-6.8
7.4-9.4
1160 to 1800 2.0 to 4.0 5.4
7.4
8.5
9.1
10.0
12.0
3.8
5.1
5.8
6.2
7.1
8.1
BX 3.4
4.6
5.0-5.2
5.4-5.6
6.0-6.8
7.4-7.9
1160 to 1800 2.0 to 4.0 7.4
10.0
11.0
11.0
11.0
12.0
5.2
7.1
7.3
7.4
7.7
7.9
6-2-5 Lubrication Requirements
Main Drive Motor: The drive motor bearings are pre-lubricated as
stipulated in Figure 9 on page 32.
Deflection = Belt Span
64
Belt Span