Installation 41/68
RE 15302-WA/05.2019, Hägglunds CB, Installation and maintenance manual ,
Bosch Rexroth Mellansel AB
Tightening of shrink disc
1. Keep tension in the lifting straps to avoid a skewed setting of the coupling
adapter or coupling motor during the tightening of the screws. Wobbling caused
from a skewed setting will add a load to the main bearing of the motor.
2. In order to avoid misalignment of the two clamping rings during the tightening of
the screws, the gap between the rings must be measured in several places during
the process, see
Fig. 38
. The difference between the measured gaps must never
vary more than 1 mm (0,04“) during any stage of the tightening process.
3.
Pre-set the coupling screws in opposite pairs (12-6-9-3 o’clock) to max 1/3 of
the of the torque specified for the screws, see
Table 15
. It is very important
that when you reach this stage the misalignment is kept within the tolerance as
described above.
4. Mark the screw head
at 12 o‘clock with a pen or paint so that you can follow the
turning sequence of the screws.
5.
Set the torque wrench to max 1/3 of the specified maximum torque for the
coupling screws, tighten all bolts in sequence, shown in
Fig. 39,
for 2 or 3 passes.
Increase the torque to max 2/3’ of maximum torque and tighten the bolts another
2 or 3 of passes.
6.
Set the torque wrench for the specified maximum torque of the coupling screws
as shown on the sign of the coupling or
Table 15
.
7. Start tightening the screws in sequence shown in
Fig. 39
.
8.
Keep on doing this until you have reached the stated torque. Several passes are
required before the screws are tightened to specified torque. Keep checking the
alignment of the coupling. (15-20 passes may be necessary).
9.
When the specified torque is reached it is important that all screws are tightened
with specified torque and that no further movement can be observed.
Fig. 38: Gap between the clamping rings
Gap
Gap
DD00079284
Keep the coupling
adapter or coupling
motor in level with
driven shaft!
