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SERVICE TECHNOLOGIES
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Check the bolts and nuts for tightening torque
every 250 h (initially at 50 h)
Check the tightness at initial 50h and then every 250 h. Tighten it to the set torque if needed. Replace it
with bolts and nuts with same or higher grade.
Important: please use the torque wrench to check the torques of bolts and nuts
Metric bolts and nuts
Thread dimensions Standard torque (N.m)
Thread dimensions
Standard torque (N.m)
M6
12.3
M14
160±3
M8
28.7
M16
240±4
M10
55. 10
M20
460±6
M12
100.2
M30
1600±2
2. Torque of main components: (N.m)
Thread dimensions
Recommended torque
M16 bolts fixing the traveling motor
252±39.2 1
M16 bolts fixing the sprocket
252±39.2
M20 bolts fixing the slewing bearing
570±60
M20 bolts fixing the swing mechanism
570±60
Important:
1. Before installed. the bolts and nuts should be cleaned
2. Grease the bolts and the nuts (such as the white zinc b able to be dissolved to lubricant), so as to
stabilize their abrasion coefficient
3. The counterweight bolts should be kept tightened up.
Caution:
all the tightening torques should be expressed with kef.m.
For example: use a wrench with 1m long to tighten the bolts and nuts, and apply 12kgf of force to the
end of wrench, generating the following torque:
1mx12kgf=12kgf.m
To generate the same torque with 0.25m wrench: 0.25mxy=12kgf.m
Needed force: y=12kgf.m / 0.25m=48kgf
