Change the v belts of Roland machine 708

Discussion in 'Man Roland Printing Presses' started by technician, Jan 3, 2020.

  1. technician

    technician Member

    Joined:
    Oct 2013
    Messages:
    11
    Location:
    philippines
    Hello guy's can any body help me how to change the v belts of Roland machine 708 main motor it's 14 PC's belts.thanks
     
  2. controlgraphics

    controlgraphics Senior Member

    Joined:
    Apr 2011
    Messages:
    161
    Location:
    Chicago,USA
  3. technician

    technician Member

    Joined:
    Oct 2013
    Messages:
    11
    Location:
    philippines
    This tensioning bolt is spanner hexagonal bolt or Allen key bolt.thank you
     
  4. sergios68

    sergios68 Member

    Joined:
    Jan 2014
    Messages:
    42
    Location:
    Monterrey, Mexico
    the first step is realease the tension of the V-belts then remove each one from pulley. you must replace all belts same size and brand you must not mix, then you must use a frequency meter for measuring the tension for all belts. I need more information about your press like model and serial because the value can change a little bit betwen serials
     
  5. mendietta

    mendietta Member

    Joined:
    Oct 2019
    Messages:
    9
    Location:
    Slovenia
    Speed alighment is also what you need to do after changing belts...
     
    Last edited: Jan 22, 2020 at 12:48 AM
  6. technician

    technician Member

    Joined:
    Oct 2013
    Messages:
    11
    Location:
    philippines
    Machine is roland 708 with perfecting .
    Machine model R708 manroland s/n33023B release the bolt from the frame of motor or realese the tension of the pulley of the belt.this is my first time to change the v belts of roland.thank you
     
  7. sergios68

    sergios68 Member

    Joined:
    Jan 2014
    Messages:
    42
    Location:
    Monterrey, Mexico
    ok it´s a serial 750 or more, then it´s a High Print machine, there is a basic adjustment for the tension of V-belts using a dinamometer, you must pull each belt using a force of 50 Newtons with a deflection of belt of 8 mm. I´m enclosing a picture of the basic adjutment.
    there is another method using a frecuency meter, you must use a formula for calculating the initial frecuency of your belts, you can download information about this procedure from continental ...
     
  8. technician

    technician Member

    Joined:
    Oct 2013
    Messages:
    11
    Location:
    philippines
    can you please show where the bolts is to release the tension of the motor if you have picture of the the bolt much better.thank you
     
  9. sergios68

    sergios68 Member

    Joined:
    Jan 2014
    Messages:
    42
    Location:
    Monterrey, Mexico
    sorry my friend , I have no pictures of the mechanical side but any mechanic could figure how to release the tension of belts and then replace it.
    as you see the motor is mounted over a plate with a hinge fixed to machine wall. there is a nut that you can screw it in order to lift the plate! you only have to rotate the nut clockwise! just pay attention to mechanism should be another nut that fix the plate first you have to loose one nut then is possible to lift the plate !!!
     
  10. sergios68

    sergios68 Member

    Joined:
    Jan 2014
    Messages:
    42
    Location:
    Monterrey, Mexico
    normally is an hex nut M24, so you must use a spanner 24 mm
     

    Attached Files:


  11. sergios68

    sergios68 Member

    Joined:
    Jan 2014
    Messages:
    42
    Location:
    Monterrey, Mexico
    you must go under printing unit 1 and at the wall inside machine, you can found the M24 hex nut in a hole trough the wall , you must found hex nuts fixed together in order to leave the shaft immovable
     
Loading...