Komatsu PC110R-1, Operation & Maintenance Manual

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DRIVING TORQUES FOR SCREWS AND NUTS
4.4 DRIVING TORQUES FOR SCREWS AND NUTS
4.4.1 STANDARD DRIVING TORQUES
4.4.2 SPECIFIC DRIVING TORQUES
IMPORTANT
☞
•
This driving torque table is not valid for screws or nuts that must lock parts made of nylon or similar ma-
terials onto washers or components made of nylon or nonferrous materials.
★
Nm (Newton metro): 1 Nm = 0.102 kgm
Thread
diameter (mm)
Pitch
(mm) Spanner size
(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
3
3.5
41
46
96 ± 10
131 ± 14
945 ± 100
1287 ± 140
135 ± 15
184 ± 20
1329 ± 140
1810 ± 190
ITEM DESCRIPTION kgm Nm
Cab platform Front support screws
Rear support screws
16 ± 1
16 ± 1
157 ± 9.8
157 ± 9.8
Engine Front support central screw
Rear support central screw
16 ± 1
16 ± 1
157 ± 9.8
157 ± 9.8
Ball-bearing ring Upper structure nuts
Undercarriage screws
32 ± 1
32 ± 1
314 ± 9.8
314 ± 9.8