PLATFORM BASKET RR 14 EVO 2-400 Hybrid, Use And Maintenance Manual

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RR 14 EVO 2-400 HYBRID
11.23. SCREW TIGHTENING
All screws are to be tightened always with a torque wrench.
Excessive tightening of the screws may damage them while insufficient tightening defeats their purpose.
Each screw has its own specific value and the calibration of the torque wrench depends on its diameter and
type.
If there are a number of screws for the same component (for example the slewing ring, plates, motor-
gearboxes) it is necessary to tighten them two at a time in diametrically opposite positions.
Below is the table of values to be used.
11.23.1. SCREW TIGHTENING TABLE
If the screws are lubricated then 60% of the torque value for tightening is to be used while if the screws are
not lubricated then 70% of the value given in the table is to be used.
PRE-LOAD AND TORQUE FOR SCREWS WITH ISO THREAD AND WIDE PITCH
Nominal
screw
diameter
Max pre-load Max torque (kgm) Ma (kgm.)
6,6 8,8 10,9 12,9 6,6 8,8 10,9 12,9
6 D 8 G 10 K 12 K 6 D 8 G 10 K 12 K
M4x0,7 222 394 554 665 0,17 0,31 0,43 0,52
M5x0,8 357 635 895 1070 0,33 0,60 0,84 1,01
M6x1 507 902 1270 1520 0,58 1,03 1,46 1,75
M7x1 728 1300 1820 2180 0,94 1,69 2,36 2,83
M8x1,25 920 1640 2310 2770 1,39 2,48 3,49 4,19
M9x1,25 1210 2160 3050 3630 2,05 3,67 5,18 6,17
M10x1,5 1480 2600 3660 4380 2,83 4,97 7,00 8,37
M12x1,75 2120 3780 5320 6380 4,74 8,46 11,90 14,30
M14x2 2890 5160 7250 8700 7,54 13,46 18,92 22,70
M16x2 3950 7020 9900 11900 11,50 20,40 28,80 34,60
M18x2,5 4840 8600 12100 14500 16,00 28,40 40,00 48,00
M20x2,5 6160 11000 15450 18500 22,20 39,60 55,60 66,60
M22x2,5 7630 13600 19100 22900 30,00 53,00 74,50 90,00
M24x3 8900 15900 22300 26700 39,00 70,00 98,00 117,00
M27x3 11500 20600 28900 34700 56,00 101,00 142,00 170,00
M30x3 14100 25200 35400 42400 77,00 138,00 193,00 232,00
ULTIMO GRUPPO TABELLA
The pre-load has been calculated as 70% of the minimum yield load.
The torque has been calculated using the formula (39) of the junker & blume manual, and giving a friction
coeffi cient μ ges the average value μ ges = 0,14 .
English
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