40
UTD.123.2019-10.00_EN
Attention! Verify that machine shaft end has dimensions, tolerances and roughness as per fig. 7.12.1 ... 7.12.3
and table 7.12.1; the respect of these prescriptions guarantees the correct running of the shrink disc and is an
integrating part of ATEX protection system.
Pre-arrange a proper protection of the shrink disc against the accidental contact and against the dust; when it is
not possible (eg.: machine through shaft) foresee an adequate maintenance plan to guarantee that the thickness
of the material is reduced and never exceeding 5 mm.
Installing
Attention!
Do not tighten the screws of shrink disc before mounting the gear reducer onto machine shaft
in order not to deform the hollow shaft. When keying the shrink disc follow these instructions:
– carefully degrease the surfaces of hollow shaft and shaft end of driven machine to be fitted;
– mount the shrink disc on gear reducer hollow shaft by lubricating first the external surface; position
axially to dimension «Q» (see tab. 7.12.1) the shrink disc.
– slightly tighten a first group of three screws positioned at about 120° as shown in fig. 7.12.4;
– tighten the screws by a dynamometric wrench – set at a value approximately higher than 5% compared
to the one foreseen in table 7.12.1 – the screws of shrink disc must be gradually and uniformly tightened,
with continous sequence (not diagonally!) see fig. 7.12.5 and during several phases (approx. 1/4 rotation
each time) until the 1/4 rotation is not possible anymore;
– tighten again 1 or 2 times with dynamometric wrench verifying that the tightening torque stated in table
7.12.1 has been realized;
– when having heavy duty cycles, with frequent reversals, verify again after some hours of running, the bolt
tightening torque.
– verify the screw titightening torque at every maintenance interval (oil change) or in case of anomalous
vibrations (see table 14.2).
Removing
Before disassembling, ensure that no torque/load is applied on the shrink disc, on shaft or other connected
elements.
Attention! Do not completely remove fastening screws before locking rings are disengaged.
Risk of serious injury!!!
Clean off any rusty areas.
Loosen the fastening screws one after the other only by using approx.
½
turn at a time and by a continuous
sequence (not crossing), until shrink disc can be moved on hollow shaft.
Remove the gear reducer from machine shaft end.
Fig. 7.12.4
Fig. 7.12.5
