TIGHTENING TORQUES
201
4.5 TIGHTENING TORQUES
4.5.1 STANDARD TIGHTENING TORQUES FOR SCREWS AND NUTS
CAUTION
q
If screws, nuts or other parts are not tightened with the required torque, they may become loose or dam-
age the components with which they cooperate, and this may cause machine failures or operation prob-
lems. Always pay the utmost attention when carrying out tightening operations.
If not specified otherwise, tighten the screws and nuts applying
the torques specified in the table.
If it is necessary to replace a screw or a nut, always use Komatsu
original spare parts having the same size of the part to be re-
placed.
a
Nm (Newton metre): 1 Nm = 0.102 kgm
IMPORTANT
q
This tightening torque table is not valid for screws or nuts that must fasten parts made of nylon or simi-
lar materials onto washers or components made of nylon or nonferrous metals or requiring specific
tightening torques.
RYA02980
Thread diame-
ter (a) (mm)
Pitch
(mm)
Wrench size
(b) (mm)
8.8
10.9
kgm
Nm
kgm
Nm
6
8
10
12
14
1
1.25
1.5
1.75
2
10
13
17
19
22
0.96 ± 0.1
2.3 ± 0.2
4.6 ± 0.5
7.8 ± 0.8
12.5 ± 1
9.5 ± 1
23 ± 2
45 ± 4.9
77 ± 8
122 ± 13
1.3 ± 0.15
3.2 ± 0.3
6.5 ± 0.6
11 ± 1
17.5 ± 2
13.5 ± 1.5
32.2 ± 3.5
63 ± 6.5
108 ± 11
172 ± 18
16
18
20
22
24
2
2.5
2.5
2.5
3
24
27
30
32
36
19.5 ± 2
27 ± 3
38 ± 4
52 ± 6
66 ± 7
191 ± 21
262 ± 28
372 ± 40
511 ± 57
644 ± 70
27 ± 3
37 ± 4
53 ± 6
73 ± 8
92 ± 10
268 ± 29
366 ± 36
524 ± 57
719 ± 80
905 ± 98
27
30
33
36
39
3
3.5
3.5
4
4
41
46
50
55
60
96 ± 10
131 ± 14
177 ± 20
230 ± 25
295 ± 33
945 ± 100
1287 ± 140
1740 ± 200
2250 ± 250
2900 ± 330
135 ± 15
184 ± 20
250 ± 27
320 ± 35
410 ± 45
1329 ± 140
1810 ± 190
2455 ± 270
3150 ± 350
4050 ± 450
WEAM012405
Summary of Contents for PC16R-3
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Page 25: ...SAFETY AND ACCIDENT PREVENTION 23 WEAM012405...
Page 79: ...THE MACHINE AND ITS OPERATIONS 77 WEAM012405...
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Page 191: ...MAINTENANCE 189 WEAM012405...
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Page 245: ...TECHNICAL SPECIFICATIONS 243 WEAM012405...
Page 253: ...AUTHORISED OPTIONAL EQUIPMENT 251 WEAM012405...
Page 286: ...284 WEAM012405...
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Page 288: ...2017 KOMATSU ITALIA MANUFACTURING S p A All Rights Reserved Printed in Europe 02 2017...