How to replace an Acroprint 125 / 150 punch clock motor
Photos below.

• 1) Unplug it, remove the case
• 2) Tools needed: 
  Size 2 phillips screwdriver, Size 3 phillips screwdriver
  Thin flat blade screwdriver, a new time clock ribbon
  Two wire nuts, new Acroprint motor and cam
  
   
  
     
  
     
  
  Steps:   Click on this link for the steps!
  Article - The rest of the article - installing an Acroprint motor and cam (employeetimeclocks.com)
• Set the clock so that the time shows any hour, and the minutes on 12 - straight-up.
• Cut the motor wires about an inch away from the motor
• Remove and discard the ribbon
• Remove the minute hand.  Note that there is a locknut underneath the hand, and a very small, specialized screw for the hand.
• Using a flat blade screwdriver, get under the hour hand right at the center and wiggle it up and off.  It's on a sleeve.
• Remove the 4 face screws and the face.  This exposes the frame.
• Using the allen wrench, remove the cam and put the allen screw aside.
  --  Note:  You will be reusing the allen screw.
• It's okay to force (twist and turn) the cam position, the motor is going away, anyway.
• Remove the 4 large screws on the fork. 
• Wack the back side of the motor frame assembly to release it.
• That big gear controls the minute alignment.
  --  It is adjustable after you put it back together to center the minutes
       if you need to.
• See the allen set screws, it's easy to figure out.
• Remove the motor screws. Sometimes there is one long screw and one short.
   Note that the long screw goes at the bottom.
• Replace the motor.  We put a drop of locktite (or nail polish) on the motor screws. Replace the cam.
• When replacing the cam, make the cam flush with the end of the motor - closest to you, not the frame.
  Leave just the siightest space between the cam knob (minute impulse knob) and the motor frame.  It should not rub.
                        Nearly.....Done!
• Put the motor and gear assembly back on.  Lower it in place with the black gear centering in the movement.
• Put the face back on.  Do not overtighten.
• Slide the h