Tightening Torque Specifications; Tightening Torque List - Komatsu PW160-7H Operation & Maintenance Manual

MAINTENANCE

TIGHTENING TORQUE SPECIFICATIONS

TIGHTENING TORQUE LIST

If nuts, bolts, or other parts are not tightened to the specified
torque, it will cause looseness or damage to the tightened
parts, and this will cause failure of the machine or problems
with operation.
Pay careful attention when tightening parts.
Unless otherwise specified, tighten the metric nuts and bolts to
the torque shown in the table below.
The tightening torque is determined by the width across the flats
of the nut and bolt.
If it is necessary to replace any nut or bolt, use a Komatsu genu-
ine part of the same size as the part that was replaced
Width
Thread across
diameter a flat b
(mm) (mm) N•m
6 10 13.2
8 13 31
10 17 66
12 19 11
14 22 177
16 24 279
18 27 382
20 30 549
22 32 745
24 36 927
27 41 1320
30 46 1720
33 50 2210
36 55 2750
39 60 3280
Apply the following table for Hydraulic Hose
.
Thread Width
diameter a across flat
(mm) b (mm) N•m
14 19 29.4
18 24 78.5
22 27 117.7
24 32 147.1
30 36 215.7
33 41 255.0
PW160-7H VEAM390100
CAUTION
Tightening torque
Target value
kgf•m N•m
1.35 11.8 - 14.7
3.2 27 - 34
6.7 59 - 74
11.5 98 - 123
18 157 - 196
28.5 245 - 309
39 343 - 425
56 490 - 608
76 662 - 829
94.5 824 - 1030
135.0 1180 - 1470
175.0 1520 - 1910
225.0 1960 - 2450
280.0 2450 - 3040
335.0 2890 - 3630
Tightening torque
Target value
kgf•m N•m
3.0 27.5 - 39.2
8.0 58.8 - 98.1
12.0 88.3 - 137.3
15.0 117.7 - 176.5
22.0 176.5 - 245.2
26.0 215.7 - 284.4
Service limit
kgf•m
1.2 - 1.5
2.8 - 3.5
6.0 - 7.5
10.0 - 12.5
16.0 - 20.0
25.0 - 31.5
35.0 - 43.5
50.0 - 62.0
67.5 - 84.5
84.0 - 105.0
120.0 - 150.0
155.0 - 195.0
200.0 - 250.0
250.0 - 310.0
295.0 - 370.0
Service limit
kgf•m
2.8 - 4.0
6.0 - 10.0
9.0 - 14.0
12.0 - 18.0
18.0 - 25.0
22.0 - 29.0
TIGHTENING TORQUE SPECIFICATIONS
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