ENGINE AR 7C6074 - Caterpillar

Table 1
Specification for the 7N-9693 Tension Chart
Item Qty Part Specification Description
- - - The new belt tension chart has been standardized. The belt tension chart eliminates confusion about the correct belt tension to use. Studies were completed with different belt suppliers and the information that was gathered from the studies was developed into a new belt tension for each belt size.
The chart does not apply to belts that use a spring loaded tensioner.
For more accurate results, a Clavis frequency gauge should be used in order to measure the natural frequency of the belt. By the use of a formula, the natural frequency is converted into the belt tension force. If the Clavis frequency gauge cannot be used, then use the appropriate Kent-Moore belt tension gauge to measure the belt tension force.
When matched sets of belts are used, check the tension of all the belts in order to verify that the lowest belt is in the acceptable tolerance range. Variations in tension between the belts can vary by as much as 65 lbs.
In order to determine the tension of a "banded" belt, refer to the chart above. Multiply the tension value of the belt by the number of belts that are banded together.Two 1/2 inch belts would require a used belt tension equal to twice the value of the used belt tension for one 1/2 inch belt (2 X 80 = 160 lb).
Table 2
Belt Tension Chart Field Service Tension Check
SAE or RMA Belt Size Width of Belt ( Reference) Setting Tension of New Belt Setting Tension of Used(1) Belts Reset Belt Tension if Tension Falls Below
IN MM IN MM LB N LB N LB N
3/8 (0.380) 10A 0.42 10.72 145 10 645 44 115 10 512 44 70 10 311 44
7/16 (0.440) 11A 0.46 11.68 155 10 689 44 125 10 556 44 75 10 333 44
1/2 (0.500) 13A 0.55 13.89 165 10 734 44 130 10 578 44 80 10 356 44
5V/5VX 5V 0.63 15.88 180 10 801 44 145 10 645 44 85 10 378 44
11/16 (0.600) 15A 0.69 17.48 180 10 801 44 145 10 645 44 85 10 378 44
3/4 (0.660) 17A 0.75 19.05 205 10 912 44 165 10 734 44 95 10 423 44
7/8 (0.790) 20A 0.88 22.23 205 10 912 44 165 10 734 44 95 10 423 44
15/16 N/A 0.98 23.83 205 10 912 44 165 10 734 44 95 10 423 44
4K 4PK 0.54 13.72 145 10 645 44 115 10 512 44 60 10 267 44
6K 6PK 0.82 20.94 215 10 956 44 170 10 756 44 90 10 400 44
8K 8PK 1.1 27.82 285 10 1179 44 230 10 1023 44 115 10 512 44
10K 10PK 1.38 35.05 355 10 1579 44 285 10 1268 44 145 10 645 44
12K 12PK 1.66 42.16