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MAINTENANCE
High-Strength Bolt Connections (continued)
Check tightening torque of the counterweight mounting
bolts, illust. Z 21778
Reference No.:
(1) Counterweight
(2) Lifting eyes
(3) Mounting bolts
M48
* SW = Wrench size
Re-tighten mounting bolts to their correct torque and replace
missing or damaged bolts.
The chambers of the counterweight are filled with a mixture
of concrete, granulated ore and steel pellets. This mixture
can create explosive gases which will accumulate in the
chambers of the counterweight. Before any welding, flame-
cutting, grinding or drilling procedures are carried out on the
counterweight it is vital to expel these gases from the coun-
terweight chambers. Failure to properly expel the gases from
the counterweight chambers can result in an explosion with
serious personal injury or death.
Follow the instructions given in PARTS & SERVICE NEWS
No. AH04518 for expelling the gases from the counterweight
chambers.
Bolt size
Grade
mm
10.9
WARNING
4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH
SW *
Tightening torque
mm
Nm
75
7500
Qty.
16
413
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