Dynapac CC1250, Instruction Manual

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Maintenance 52
7.4 Standard Torque Values
Use only the proper tools (inches) on hardware. Other tools may not fit properly and may slip and
cause injury.
Head Markings
Fasteners should be replaced with the same grade or a higher grade. If higher grade fasteners are
used, these should only be tightened to the strength of the original grade fastener.
Do not use these values if a different torque value or the tightening procedure is listed for a specific
application. Torque values listed are for general use only. All values are suggested maximum with dry
plated hardware.
Make sure fastener threads are clean and you properly start thread engagement. This will prevent them
from falling when tightening.
The following pages list the recommended tightening torques for the various size bolts used for the
machine. Proper torque specifications should be used at all times.
Recommended Torques
This page lists the recommended tightening torques, in foot/pounds (ft·lb), for the various size bolts and
nuts that are used. Proper torque specifications should be used at all times. Dry means clean dry
threads and lube means a light film of oil. Excess oil in a threaded dead end hole can create a hydraulic
lock giving false torque readings. Suggested assembly torque values are per engineering
specifications.
Table 7-11: Recommended Torques in ft·lb
M-thread
Size
Metric coarse screw thread, bright galvanized (fzb):
8.8 Oiled 8.8 Dry 10.9 Oiled 10.9, Dry 12.9,
Oiled
12.9, Dry
M6 8,4 9,4 12 13,4 14,6 16,3
M8 21 23 28 32 34 38
M10 40 45 56 62 68 76
M12 70 78 98 110 117 131
M14 110 123 156 174 187 208
M16 169 190 240 270 290 320
M20 330 370 470 520 560 620
M22 446 497 626 699 752 839
!