3 Assembly instructions, storage, preparation, installation
B 1050 en-1819 41
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A check/adjustment of the belt tension (tension check) of the belt drive must be carried out in order to
ensure correct functioning.
A suitable contact pressure must be ensured. Excessive, or too little contact pressure increases
losses due to friction and may result in an interruption of torque transfer.
The belt tension can be checked with the aid of various measuring devices. NORD recommends that
the check is made with the aid of a non-contact frequency measuring device, which enables quick,
simple and reliable testing in inaccessible areas.
Initial installation or the general inspection procedure with a frequency measuring device is described
below (deviations which are specific to the manufacturer are possible):
1. Alignment of the shaft or the V-belt pulley parallel to the axis and horizontally must be ensured
(max. angular deviation and displacement values can be provided on request).
2. Clean and de-grease all bare metal surfaces such as holes and the surface of the tapered
bushing of the pulley.
3. Insert the tapered bushing in the hub and bring all connecting holes into alignment. Half-
threaded holes must be opposite half-smooth holes.
4. Lightly oil studs or cylindrical screws and screw them in. Do not tighten the screws yet.
5. Clean and de-grease the shaft.
6. Push the pulley with the taper bushing to the required position on the shaft (see V-belt pulley
alignment).
7. If a parallel key is used, this must first be placed in the groove on the shaft. There must be
play between the parallel key and the groove in the hole.
8. Evenly tighten the studs or cylindrical screws to the specified torques (available on request)
with a DIN 911 Allen key.
9. Place on the belts in sequence and roughly pre-adjust the tension by increasing the gap
between the axles.
10. After this, the pre-tensioned belt is set into vibration (plucking or hitting with a finger is
sufficient).
11. Point the sensor of the measuring device at the vibrating power drum and read the
measurement.
12. If necessary, increase the axle spacing or the belt pre-tension and measure again.
13. To prevent the entry of foreign bodies, fill empty connection holes with grease.
14. From experience, after a running time of 0.5 to 4 hours, check the belt tension again and
correct as necessary.
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