Komatsu PW160-7H, Operation & Maintenance Manual

Page: 237 / 346

MAINTENANCE TIGHTENING TORQUE SPECIFICATIONS
PW160-7H VEAM390100 237
TIGHTENING TORQUE SPECIFICATIONS
TIGHTENING TORQUE LIST
CAUTION
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
Apply the following table for Hydraulic Hose
.
Thread
diameter a
(mm)
Width
across
flat b
(mm)
Tightening torque
Target value Service limit
N•m kgf•m N•m kgf•m
6 10 13.2 1.35 11.8 - 14.7 1.2 - 1.5
8 13 31 3.2 27 - 34 2.8 - 3.5
10 17 66 6.7 59 - 74 6.0 - 7.5
12 19 11 11.5 98 - 123 10.0 - 12.5
14 22 177 18 157 - 196 16.0 - 20.0
16 24 279 28.5 245 - 309 25.0 - 31.5
18 27 382 39 343 - 425 35.0 - 43.5
20 30 549 56 490 - 608 50.0 - 62.0
22 32 745 76 662 - 829 67.5 - 84.5
24 36 927 94.5 824 - 1030 84.0 - 105.0
27 41 1320 135.0 1180 - 1470 120.0 - 150.0
30 46 1720 175.0 1520 - 1910 155.0 - 195.0
33 50 2210 225.0 1960 - 2450 200.0 - 250.0
36 55 2750 280.0 2450 - 3040 250.0 - 310.0
39 60 3280 335.0 2890 - 3630 295.0 - 370.0
Thread
diameter a
(mm)
Width
across flat
b (mm)
Tightening torque
Target value Service limit
N•m kgf•m N•m kgf•m
14 19 29.4 3.0 27.5 - 39.2 2.8 - 4.0
18 24 78.5 8.0 58.8 - 98.1 6.0 - 10.0
22 27 117.7 12.0 88.3 - 137.3 9.0 - 14.0
24 32 147.1 15.0 117.7 - 176.5 12.0 - 18.0
30 36 215.7 22.0 176.5 - 245.2 18.0 - 25.0
33 41 255.0 26.0 215.7 - 284.4 22.0 - 29.0