Miscellaneous; Tightening And Retightening Torque Of Nuts And Bolts - Hitachi ZAXIS 250LC-7 Operator's Manual

B. Miscellaneous
Tightening and Retightening Torque of Nuts and
Bolts
--- every 250 hours (first time after 50 hours)
Tighten to torque shown if any are loose. Bolts and nuts should
be replaced with those of the same or higher grade.
Check tightness after the first 50 hours then every 250 hours.
For tightening nuts and bolts other than specified in the table
below, refer to the Tightening Torque Chart at the end of this
section.
No. Descriptions
1. Counterweight mounting bolt
2. Additional counterweight mounting bolt
MAINTENANCE
Machine Type Bolt Dia
ZX250LC(N)-7 M30
ZX300LC(N)-7 M33
ZX350LC(N)-7 M36
ZX250LC(N)-7 -
ZX300LC(N)-7 M30
ZX350LC(N)-7 M30
6-4
Wrench size
Quantity
mm
46
4 50
55
- -
3
46
4
Torque
N·m (kgf·m)
1950 195
2360 236
2840 284
- -
1950 195