WCM CTX8010 Operations & Parts Manual page 41

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!
Thread dimensions
M6
M8
M10
M12
2. Torque of main components: (N.m)
Thread dimensions
M16 bolts fixing the traveling motor
M16 bolts fixing the sprocket
M20 bolts fixing the slewing bearing
M20 bolts fixing the swing mechanism
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 kgf.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:
To generate the same torque with 0.25m wrench: 0.25m×y=12kgf.m
Needed force: y=12kgf.m／0.25m=48kgf
Metric bolts and nuts
Standard torque (N.m)
12±3
28±7
55±10
100±20
1m×12kgf=12kgf.m
Thread dimensions
M14
M16
M20
M30
Recommended torque
39
Standard torque (N.m)
160±30
240±40
460±60
1600±200
252±39.2
252±39.2
570±60
570±60