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Section 5
5.20 INSPECTION OF NUT AND BOLT CONNECTIONS
TIGHTENING TORQUE FOR NUT AND
During maintenance or repair work, apply
appropriate torque when tightening bolt
and nut connections, unless other tight-
ening torque values are given. Recom-
mended tightening torque values for the
most frequently used bolt and nut connec-
tions are given in Table 5.6. Given values
apply to non-lubricated steel bolts.
Hydraulic lines should be tightened with
a torque of 50-70 Nm.
Tightening torque should be checked using
a torque wrench. During daily inspection
of the trailer, pay attention to loosen con-
nections and tighten them, if necessary.
Lost components must be replaced with
new ones.
TIGHTENING OF WHEEL NUTS
Wheel nuts should be tightened gradually
and diagonally (in several stages, until
the required tightening torque is obtained)
using a torque wrench. See FIGURE 5.15
for the recommended nut tightening se-
quence and tightening torque value.
Wheel nuts must not be tightened with
impact wrench because of danger of ex-
ceeding permissible tightening torque, the
5.32
PRONAR T700M/1
BOLT CONNECTIONS
Technical inspection schedule
Table 5.6
Tightening torque values
Tightening torque
Thread
5.8
(*)
M8
18
M10
37
M12
64
M14
100
M16
160
M20
300
M24
530
M27
820
M30
1,050
(*) – resistance class according to DIN ISO 898
standard
1
Figure 5.15
Bolt with metric thread
(1) strength class, (d) thread diameter
8.8
10.9
(*)
(*)
25
36
49
72
85
125
135
200
210
310
425
610
730
1,050
1,150
1,650
1,450
2,100
d
589-I.10-1
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