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Table 18 Deflection Forces for Belt Tensioning
Deflection Forces for Belt Tensioning (lb.)
Belt Type
0-100 RPM 101-1000 RPM 1000-Up RPM
New
Belt
Used
Belt
New
Belt
Used
Belt
New
Belt
Used
Belt
SilentSync®
Yellow
15
11
12
8
9
7
White
30
21
24
17
19
13
Purple
60
43
47
34
38
27
Blue
54
38
44
31
38
27
Green
60
57
66
47
57
41
Orange
107 76
88
63
76
55
Red
161 115 131 94
115 82
Falcon Pd®
8GTR 12
24
17
14
10
9
7
8GTR 21
42
30
25
18
16
12
8GTR 36
72
51
42
30
27
21
8GTR 62
124 88
72
52
47
36
14GTR 20
38
29
31
23
28
21
14GTR 37
70
54
57
43
52
39
14GTR 68
129 99
105 78
95
71
14GTR 90
171 131 140 104 126 95
14GTR 125 238 181 194 144 175 131
Blackhawk Pd®
8MBH12
12
9
9
7
7
5
8MBH 22
23
17
16
12
13
10
8MBH 35
36
26
26
19
21
16
8MBH 60
62
45
45
33
36
27
14MBH 20 36
26
27
20
23
17
14MBH 42 76
55
57
42
49
36
14MBH 65 117 85
89
65
76
55
14MBH 90 162 118 123 90
105 77
14MBH 120 217 157 164 119 139 102
Hawk Pd®
8M 20
15
11
13
10
12
9
8M 30
23
17
20
15
19
14
8M 50
39
29
35
26
32
24
8M 85
69
50
61
45
56
41
14M 40
47
34
38
28
32
24
14M 55
70
51
56
41
48
35
14M 85
116 84
93
68
79
58
14M 115
162 118 130 95
110 80
14M 170
249 181 201 146 171 125
Synchronous Belts
Installation Guide
First, determine the proper deflection force to tension the
belt. Deflection forces are listed in Table 18. Deflection forces
are also given on the output of the MaximizerPro™ computer
drive analysis.
If using a tension gauge, the deflection scale is calibrated in
inches of span length. Check the force required to deflect the
belt the proper amount. There is an O-ring to help record the
force. If the measured force is less than the required deflection
force, lengthen the center distance. If the measured force is
greater than the required deflection force, shorten the
center distance.
If using other means to apply force to the belt, adjust the center
distance so that the belt is deflected 1/64 inch per inch of span
length when the proper force is applied. After the belt is
properly tensioned, lock down the center distance adjustments
and recheck the sprocket alignment.
If possible, run the drive for approximately 5 minutes with or
without load. Stop the drive, lock out the power source and
examine alignment, capscrew torque and belt tension of the
drive. Adjust the center distance to increase the belt tension to
the “new” value in the Deflection Force Tables. Lock down the
drive adjustments and recheck tension. Recheck the belt
tension, alignment and capscrew torque after 8 hours of
operation to ensure the drive has not shifted.
Synchronous Belts
Installation Guide
41