Komatsu PC20MR-2 Shop Manual page 16

Foreword
Table of tightening torques for flared nuts
a In the case of flared nuts for which there is no special instruction, tighten to the torque given in the table
below.
Thread diameter
mm
10
12
16
Table of tightening torques for o-ring boss piping joints
a Unless there are special instructions, tighten the O-ring boss piping joints to the torque below.
Thread diameter
Norminal No.
02
03, 04
05, 06
10, 12
14
Table of tightening torques for o-ring boss plugs
a Unless there are special instructions, tighten the O-ring boss plugs to the torque below.
Thread diameter
Norminal No.
08
10
12
14
16
18
20
24
30
33
36
42
52
Width across flats
mm
14
17
22
Width across flats
mm mm
14
20 Varies depending
24 on type of
33 connector.
42
Width across flats
mm mm
08 14
10 17
12 19
14 22
16 24
18 27
20 30
24 32
30 32
33 —
36 36
42 —
52 —
Tightening torque
Nm
59 – 74
98 – 123
235 – 285
Tightening torque (Nm {kgm})
Range
35 – 63 {3.5 – 6.5}
84 – 132 {8.5 – 13.5}
128 – 186 {13.0 – 19.0}
363 – 480 {37.0 – 49.0}
746 – 1010 {76.0 – 103}
Tightening torque (Nm {kgm})
Range
5.88 – 8.82 {0.6 – 0.9}
9.8 – 12.74 {1.0 – 1.3}
14.7 – 19.6 {1.5 – 2.0}
19.6 – 24.5 {2.0 – 2.5}
24.5 – 34.3 {2.5 – 3.5}
34.3 – 44.1 {3.5 – 4.5}
44.1 – 53.9 {4.5 – 5.5}
58.8 – 78.4 {6.0 – 8.0}
93.1 – 122.5 {9.5 – 12.5}
107.8 – 147.0 {11.0 – 15.0}
127.4 – 176.4 {13.0 – 18.0}
181.3 – 240.1 {18.5 – 24.5}
274.4 – 367.5 {28.0 – 37.5}
Standard tightening torque
kgm
6 – 7.5
10 – 12.5
23.5 – 29.5
Target
44 {4.5}
103 {10.5}
157 {16.0}
422 {43.0}
883 {90.0}
Target
7.35 {0.75}
11.27 {1.15}
17.64 {1.8}
22.54 {2.3}
29.4 {3.0}
39.2 {4.0}
49.0 {5.0}
68.6 {7.0}
107.8 {11.0}
124.4 {13.0}
151.9 {15.5}
210.7 {21.5}
323.4 {33.0}
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