ROSTA
5.11
Motorbases
Mounting instructions for MB 70
1 Determine of the ideal
motorbase position
ideal position of the MB,
longest tensioning travel
sufficient tensioning travel
contact
ROSTA
2 Support fixations
4 slotted holes 22
×
54 mm
5 Insert and tension the belts, control belt test force
Tensioning of the belts according to belt suppliers recommended test force
(table on page 5.5). Adjust uniformly the 2 pretensioning devices with a
30 mm wrench (M20). Its operation area is limited by the vertical plates on
the supports.
4 Loosen of the center bolts
(element axis) and of the bolts
on friction plates
46 mm wrench (M30) and
24 mm wrench (M16)
3 Alignment of pulleys
and motor fixation
4 bolts according to relevant motor size
Retension
:
Generally retensioning is not necessary, however, we recommend to inspect the belt tension
after a few days of operation.
6 Tighten of the center and fixing
bolts (friction plates), start of
operation
46 mm wrench (M30),
locking torque 1400 Nm and
24 mm wrench (M16),
locking torque 210 Nm.
The adjustment yokes must be relocated
before they hit the end stops
5.1
Tighten center bolts M30 and friction plate bolts M16
5.2 Release pretensioning device on one side and
remove hex socket bolts M12
5.3 Move pretensioning device to line up with desired
holes on friction plate
5.4 Reinstall hex socket bolts M12 and tighten (86 Nm)
5.5 Extend the pretensioning device to remove slack
5.6 Go to step 5.2 to 5.5 and proceed with the
opposite pretensioning device
5.7
After both tensioners are relocated, continue with
step 4 to 6
Do not use
compressed-air power
tools for tensioning!
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2
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