Check the high-tensile bolts. The high-tensile bolts must meet these requirements:

─     The high-tensile bolts and mounting plate with high-tensile nuts may only be installed with tightening torque a maximum of two times. If they are installed more than twice with tightening torque, the high-tensile bolts as well as the mounting plates with the high-tensile nuts must be scrapped.

Should it be necessary to loosen the high-tensile bolts during installation, the same high-tensile bolts can be reused a maximum of one more time, otherwise the lubrication will no longer be sufficient!

─     The high-tensile nuts and washers must be galvanised and lubricated with MoS2.

High-tensile bolts which have been installed on a crane for a lengthier period may not be used again.

   Initially, only install the end carriages hand-tight.

   Next, place the entire crane on the crane track and install completely. As a result of the weight, the crane settles and the stress is removed.

   Then tightly screw all high-tensile bolts (with tightening torque).

─     Only tighten high-tensile bolts with the appropriate torque wrench.

─     Do not use an impact wrench.

─     Do not tighten high-tensile bolts using turn-of-nut tightening.

   Tighten the central high-tensile bolts on both sides (left and right on the end carriage). Use a torque wrench to 300 Nm.

   Next, tighten the remaining high-tensile bolts, alternating between left and right. Use a torque wrench to 300 Nm.

   Then tighten all high-tensile bolts in the same sequence. Use a torque wrench to 450 Nm.

Note

Mark the high-tensile bolts with a permanent marker with a continuous line from the bolt head over the washer to the plate. This serves as proof that all high-tensile bolts have been tightened with tightening torque.

─     Rib nut M8

─     4x per pipe clamp

─     15 Nm

─     Rib nut M8

─     4x per pipe clamp

─     15 Nm

─     Rib nut M8

─     2x per lift-off prevention device

─     15 Nm

─     Hexagon head screw M8 with hexagonal nut

─     6x

─     25 Nm