Omcan 49115, Инструкция по эксплуатации, Страница: 16 / 28

16
Maintenance
ADJUSTING THE TENSION AND CHANGING THE TRANSMISSION BELTS
If the tension of the belts is not correct, their performance and life will be drastically reduced; a belt that is too
tense will wear rapidly; if it is too slack, on the other hand, it will not transmit motion. The criterion that makes it
possible to establish if the belt is tensioned correctly varies with the type and brand, and also depends on the
diameter of the pulleys and length of the belt itself; every belt manufacturers provides instructions, which may
be quite different from one another, on how to adjust the tension. For these reasons, in case of necessity (e.g.
when the belts are replaced with others of a different type and/or brand), it will be necessary to consult the
instructions supplied by the associated manufacturer (the name and/or brand are usually shown on the belts
themselves) (it may be necessary to download them from the website). The operating instructions are given
below for replacing and adjusting the tension of the belts supplied on brand-new machines. To change the
belt/s or adjust their tension:
• Remove the guards that are secured respectively by the four screws, and six screws.
• Loosen the lock nut.
ADJUSTING THE TENSION OF THE BELT/S
• Turn the nut clockwise or anticlockwise (as viewed from above) to respectively increase or decrease the
belt tension until the correct condition is obtained.
• When the correct tension of the belt/s has been obtained lock everything by screwing in the nut against the
motor support base.
TO CHANGE THE BELT/S
• Turn the nut to loosen the belt/s just enough to make it come out of the pulley grooves; if there is more than
one transmission belt, it is absolutely necessary to replace all of them (and not just the apparently ruined
one) to ensure the maximum efficiency of the machine.
• Fit the new belt/s in such a way that it enters/they enter directly into the grooves of the pulleys.
• Adjust the tension of the belt/s as described above.
When the adjustment is complete, put back the guards and secure them using all the fixing screws envisaged.
CHANGING THE MICROSWITCHES ASSOCIATED WITH THE GUARDS
Proceed as follows to access the microswitches
1. Extract the radial spring pin and then pull the handle towards yourself and remove it.
2. Remove the guard secured by four screws.
3. Remove the screws with a Philips screwdriver; put them in a safe place so as not to lose them.
4. Using a Philips screwdriver, remove the screw and then remove the cover of the contacts.
5. Loosen the screws of the terminals and take out the electrical conductors from the microswitch
6. Insert the conductors into the new microswitch and connect them to the terminals, fixing the screws.
7. Take the cover of the microswitch and fix it with the screw.
8. Put the new microswitch on the plate in such a way that the holes are aligned with the threaded holes; with
the guard down, the head of the microswitch must enter the slot in the disc.
9. Secure the microswitch with the screws; the new microswitch must have the same or better physical and
performance characteristics as the one being replaced (the same measurements and interaxis of the fixing
holes, possibility of regulating the tripping point, stable closure of the contacts when the guard is down); if