PIX-Belt Tension Tester

Proper belt tension is essential for optimum power transmission and also for the life of the belt. To ensure optimum V-belt drive operation, it is recommended to check the tension in the belts by measuring the deflection force value (N) with the help of a tension measuring device. Belt tension in most of the drives can be checked with adequate reliability by means of PIX Belts Tension Tester.

Tension Measurement Procedure

  1. Measure the span-length of the Belt in mm. (refer below sketch drawings)
  2. Tie a string or a thread on the two pulleys along with the length of the Belt and mark the center of the span on the Belt.
  3. Calculate 1.5% of the span (say ‘x’) for Belt length less than 1000 mm and 1.0% of the span for Belt length more than 1000 mm. Adjust lower ring on the tension tester on the millimeter scale to coincide, "x" mm with the lower side of the ring. Adjust lower side of the upper ring at 0.00 N.
  4. Place tension tester at the center of the span of the Belt. Apply force with the help of tension tester perpendicular to the span, till the lower surface of the lower ring touches the string.
  5. Read the deflection force value (N) on the Newton scale by taking reading at the lower side of the upper ring.
  6. Compare the deflection force value (N) with the values given in the Table 'A'. The deflection force value (N) should lie between the minimum and maximum values given in the Table 'A'. (Next page)
  7. Deflection force less than the minimum recommended value in the range indicates an under-tensioned drive & deflection force higher than the maximum recommended value indicates an over-tensioned drive

Important

  1. For new Belts the deflection force value (N) should be kept at maximum.
  2. Maximum deflection force value (N) is recommended for pulsating & shock loads.
  3. It is recommended to re-check the Belt tension after approximately 24 hours of running and adjust the tension, if necessary.

Technical Specification

Deflection force required for measuring tension in V-Belt drives
Cross Section Smaller pulley diameter (mm) Condition1
Deflection@1% of span, if span
length is more than 1000mm 		Condition2
Deflection@1.5% of span, if span
length is less than 1000mm
Required deflection force ‘F’ at
the centre of span for Belt speed 		Required deflection force ‘F’ at
the centre of span for Belt speed
WRAPPED - CLASSICAL Belts
0 m/s to
10 m/s Range (N)		 10 m/s to
20 m/s Range (N)		 < 20 m/s
Range (N)		 0 m/s to
10 m/s Range (N)		 10 m/s to
20 m/s Range (N)		 < 20 m/s
Range (N)
Z 50-100
100 & above		 4-6
6-9		 4-5
6-7		 3-4
5-6		 5-8
8-12		 5-7
8-9		 4-5
7-8
A 71-140
140 & above		 8-12
12-18		 7-10
10-14		 6-8
8-12		 11-16
16-24		 9-13
13-19		 8-11
11-16
B 112-200
200 & above		 16-24
24-35		 13-19
19-29		 10-16
16-24		 21-32
32-47		 17-25
25-39		 13-21
21-32
C 180-400
400 & above		 31-46
46-70		 26-38
38-58		 20-31
31-46		 41-61
61-93		 35-51
51-77		 27-41
41-61
D 315-600
600 & above		 62-90
90-134		 52-76
76-115		 42-62
62-90		 83-120
120-179		 69-101
101-153		 56-83
83-120
E 450-915
915 & above		 108-160
160-240		 90-137
137-205		 73-109
109-160		 144-213
213-320		 120-183
183-273		 97-145
145-213
WRAPPED - WEDGE / NARROW Belts
SPZ / 3V 63-95
95 & above		 8-12
12-17		 7-10
10-16		 6-9
9-14		 11-16
16-23		 9-13
13-21		 8-12
12-19
SPA 90-140
140 & above		 14-20
20-31		 12-17
17-26		 10-14
14-22		 19-27
27-41		 16-23
23-35		 13-19
19-29
SPB / 5V 140-265
265 & above		 25-36
36-46		 20-32
32-41		 18-27
27-37		 33-48
48-61		 27-43
43-55		 24-36
36-49
SPC 224-355
355 & above		 46-66
66-85 		38-58
58-76 		32-52
52-70		 61-88
88-113 		51-77
77-101 		43-69
69-93
8V 335-520
520 & above		 81-107
107-167		 68-90
90-140		 56-73
73-113		 108-143
143-223		 91-120
120-187 		75-97
97-151
CUT EDGE - CLASSICAL V-Belts
ZX 40-100
100 & above		 5-7
7-10		 5-6
7-8		 3-5
6-7		 6-9
9-14		 6-8
9-11		 5-6
8-9
AX 63-140
140 & above		 9-14
14-21 		8-12
12-16		 7-9
9-14		 12-18
18-28		 11-15
15-21		 9-12
12-18
BX 90-200
200 & above		 18-28
28-40		 15-22
22-33		 12-18
18-28		 25-37
37-54		 20-29
29-44		 15-25
25-37
CX 140-400
400 & above		 36-53
53-81		 30-44
44-67		 23-36
36-53		 48-71
71-107		 40-58
58-89		 31-48
48-71
CUT EDGE - WEDGE / NARROW V-Belts
XPZ / 3VX 56-95
95 & above		 9-14
14-20		 8-12
12-18		 7-10
10-16		 12-18
18-26		 11-15
15-25		 9-14
14-21
XPA 71-140
140 & above		 16-23
23-36		 14-20
20-30		 12-16
16-25		 21-31
31-48		 18-26
26-40		 15-21
21-34
XPB / 5VX 112-265
265 & above		 29-41
41-53		 23-37
37-47		 21-31
31-43		 38-55
55-71		 31-49
49-63		 28-41
41-57
XPC 180-355
355 & above		 53-76
76-98 		44-67
67-87		 37-60
60-81		 71-101
101-130 		58-89
89-117 		49-80
80-107

Note: Maximum Belt linear speed (Classical section: up to 30 m/sec, Wedge: up to 42 m/sec, Narrow: up to 45 m/sec

If you would require any additional information, please write an e-mail to us at info@pixtrans.com

Preventive Maintenance

Other Accessories